Remove obsolete macros
[u/mrichter/AliRoot.git] / TRD / AliTRDdigitizer.cxx
CommitLineData
f7336fa3 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17$Log$
b1113c6b 18Revision 1.32 2002/02/12 16:07:21 cblume
19Add new constructor
20
bfc40adc 21Revision 1.31 2002/02/11 14:27:11 cblume
22New pad plane design, new TRF+PRF, tail cancelation, cross talk
23
e23fbb27 24Revision 1.30 2001/11/19 08:44:08 cblume
25Fix bugs reported by Rene
26
a1c3aded 27Revision 1.29 2001/11/14 19:44:25 hristov
28Numeric const casted (Alpha)
29
20c69486 30Revision 1.28 2001/11/14 16:35:58 cblume
31Inherits now from AliDetector
32
85cbec76 33Revision 1.27 2001/11/14 10:50:45 cblume
34Changes in digits IO. Add merging of summable digits
35
abaf1f1d 36Revision 1.26 2001/11/06 17:19:41 cblume
37Add detailed geometry and simple simulator
38
16bf9884 39Revision 1.25 2001/06/27 09:54:44 cblume
40Moved fField initialization to InitDetector()
41
88fd7ccb 42Revision 1.24 2001/05/21 16:45:47 hristov
43Last minute changes (C.Blume)
44
db30bf0f 45Revision 1.23 2001/05/07 08:04:48 cblume
46New TRF and PRF. Speedup of the code. Digits from amplification region included
47
872a7aba 48Revision 1.22 2001/03/30 14:40:14 cblume
49Update of the digitization parameter
50
a3c76cdc 51Revision 1.21 2001/03/13 09:30:35 cblume
52Update of digitization. Moved digit branch definition to AliTRD
53
6244debe 54Revision 1.20 2001/02/25 20:19:00 hristov
55Minor correction: loop variable declared only once for HP, Sun
56
c3a4830f 57Revision 1.19 2001/02/14 18:22:26 cblume
58Change in the geometry of the padplane
59
71d9fa7b 60Revision 1.18 2001/01/26 19:56:57 hristov
61Major upgrade of AliRoot code
62
2ab0c725 63Revision 1.17 2000/12/08 12:53:27 cblume
64Change in Copy() function for HP-compiler
65
1948ba0c 66Revision 1.16 2000/12/07 12:20:46 cblume
67Go back to array compression. Use sampled PRF to speed up digitization
68
e153aaf6 69Revision 1.15 2000/11/23 14:34:08 cblume
70Fixed bug in expansion routine of arrays (initialize buffers properly)
71
259b9e4b 72Revision 1.14 2000/11/20 08:54:44 cblume
73Switch off compression as default
74
c1e4b257 75Revision 1.13 2000/11/10 14:57:52 cblume
76Changes in the geometry constants for the DEC compiler
77
dd56b762 78Revision 1.12 2000/11/01 14:53:20 cblume
79Merge with TRD-develop
80
793ff80c 81Revision 1.1.4.9 2000/10/26 17:00:22 cblume
82Fixed bug in CheckDetector()
83
84Revision 1.1.4.8 2000/10/23 13:41:35 cblume
85Added protection against Log(0) in the gas gain calulation
86
87Revision 1.1.4.7 2000/10/17 02:27:34 cblume
88Get rid of global constants
89
90Revision 1.1.4.6 2000/10/16 01:16:53 cblume
91Changed timebin 0 to be the one closest to the readout
92
93Revision 1.1.4.5 2000/10/15 23:34:29 cblume
94Faster version of the digitizer
95
96Revision 1.1.4.4 2000/10/06 16:49:46 cblume
97Made Getters const
98
99Revision 1.1.4.3 2000/10/04 16:34:58 cblume
100Replace include files by forward declarations
101
102Revision 1.1.4.2 2000/09/22 14:41:10 cblume
103Bug fix in PRF. Included time response. New structure
104
eda4336d 105Revision 1.10 2000/10/05 07:27:53 cblume
106Changes in the header-files by FCA
107
6798b56e 108Revision 1.9 2000/10/02 21:28:19 fca
109Removal of useless dependecies via forward declarations
110
94de3818 111Revision 1.8 2000/06/09 11:10:07 cblume
112Compiler warnings and coding conventions, next round
113
dd9a6ee3 114Revision 1.7 2000/06/08 18:32:58 cblume
115Make code compliant to coding conventions
116
8230f242 117Revision 1.6 2000/06/07 16:27:32 cblume
118Try to remove compiler warnings on Sun and HP
119
9d0b222b 120Revision 1.5 2000/05/09 16:38:57 cblume
121Removed PadResponse(). Merge problem
122
f0a7bf65 123Revision 1.4 2000/05/08 15:53:45 cblume
124Resolved merge conflict
125
da581aea 126Revision 1.3 2000/04/28 14:49:27 cblume
127Only one declaration of iDict in MakeDigits()
128
129Revision 1.1.4.1 2000/05/08 14:42:04 cblume
130Introduced AliTRDdigitsManager
28329a48 131
1befd3b2 132Revision 1.1 2000/02/28 19:00:13 cblume
133Add new TRD classes
134
f7336fa3 135*/
136
137///////////////////////////////////////////////////////////////////////////////
138// //
139// Creates and handles digits from TRD hits //
abaf1f1d 140// Author: C. Blume (C.Blume@gsi.de) //
f7336fa3 141// //
142// The following effects are included: //
143// - Diffusion //
144// - ExB effects //
145// - Gas gain including fluctuations //
146// - Pad-response (simple Gaussian approximation) //
abaf1f1d 147// - Time-response //
f7336fa3 148// - Electronics noise //
149// - Electronics gain //
150// - Digitization //
151// - ADC threshold //
152// The corresponding parameter can be adjusted via the various //
153// Set-functions. If these parameters are not explicitly set, default //
154// values are used (see Init-function). //
abaf1f1d 155// As an example on how to use this class to produce digits from hits //
156// have a look at the macro hits2digits.C //
157// The production of summable digits is demonstrated in hits2sdigits.C //
158// and the subsequent conversion of the s-digits into normal digits is //
159// explained in sdigits2digits.C. //
f7336fa3 160// //
161///////////////////////////////////////////////////////////////////////////////
162
6798b56e 163#include <stdlib.h>
164
f7336fa3 165#include <TMath.h>
166#include <TVector.h>
167#include <TRandom.h>
94de3818 168#include <TROOT.h>
169#include <TTree.h>
793ff80c 170#include <TFile.h>
171#include <TF1.h>
abaf1f1d 172#include <TList.h>
85cbec76 173#include <TTask.h>
793ff80c 174
175#include "AliRun.h"
db30bf0f 176#include "AliMagF.h"
85cbec76 177#include "AliRunDigitizer.h"
f7336fa3 178
179#include "AliTRD.h"
793ff80c 180#include "AliTRDhit.h"
f7336fa3 181#include "AliTRDdigitizer.h"
da581aea 182#include "AliTRDdataArrayI.h"
183#include "AliTRDdataArrayF.h"
793ff80c 184#include "AliTRDsegmentArray.h"
da581aea 185#include "AliTRDdigitsManager.h"
793ff80c 186#include "AliTRDgeometry.h"
f7336fa3 187
188ClassImp(AliTRDdigitizer)
189
190//_____________________________________________________________________________
85cbec76 191AliTRDdigitizer::AliTRDdigitizer()
f7336fa3 192{
193 //
194 // AliTRDdigitizer default constructor
195 //
196
abaf1f1d 197 fInputFile = NULL;
198 fDigitsManager = NULL;
199 fSDigitsManagerList = NULL;
200 fSDigitsManager = NULL;
201 fTRD = NULL;
202 fGeo = NULL;
203 fPRFsmp = NULL;
204 fTRFsmp = NULL;
e23fbb27 205 fCTsmp = NULL;
206
207 fMasks = 0;
abaf1f1d 208
209 fEvent = 0;
210 fGasGain = 0.0;
211 fNoise = 0.0;
212 fChipGain = 0.0;
213 fADCoutRange = 0.0;
214 fADCinRange = 0.0;
215 fADCthreshold = 0;
216 fDiffusionOn = 0;
217 fDiffusionT = 0.0;
218 fDiffusionL = 0.0;
219 fElAttachOn = 0;
220 fElAttachProp = 0.0;
221 fExBOn = 0;
222 fOmegaTau = 0.0;
223 fPRFOn = 0;
224 fTRFOn = 0;
e23fbb27 225 fCTOn = 0;
226 fTCOn = 0;
abaf1f1d 227 fDriftVelocity = 0.0;
228 fPadCoupling = 0.0;
229 fTimeCoupling = 0.0;
230 fTimeBinWidth = 0.0;
231 fField = 0.0;
e23fbb27 232 fTiltingAngle = 0.0;
abaf1f1d 233
234 fPRFbin = 0;
235 fPRFlo = 0.0;
236 fPRFhi = 0.0;
237 fPRFwid = 0.0;
238 fPRFpad = 0;
239 fTRFbin = 0;
240 fTRFlo = 0.0;
241 fTRFhi = 0.0;
242 fTRFwid = 0.0;
e23fbb27 243 fTCnexp = 0;
abaf1f1d 244
245 fCompress = kTRUE;
e23fbb27 246 fDebug = 0;
abaf1f1d 247 fSDigits = kFALSE;
248 fSDigitsScale = 0.0;
f7336fa3 249
250}
251
252//_____________________________________________________________________________
253AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
85cbec76 254 :AliDigitizer(name,title)
f7336fa3 255{
256 //
85cbec76 257 // AliTRDdigitizer constructor
258 //
259
260 fInputFile = NULL;
261
262 fDigitsManager = NULL;
263 fSDigitsManager = NULL;
264 fSDigitsManagerList = NULL;
265
266 fTRD = NULL;
267 fGeo = NULL;
268 fPRFsmp = NULL;
269 fTRFsmp = NULL;
e23fbb27 270 fCTsmp = NULL;
271
272 fMasks = 0;
85cbec76 273
274 fEvent = 0;
275
276 fCompress = kTRUE;
e23fbb27 277 fDebug = 0;
85cbec76 278 fSDigits = kFALSE;
279
280 Init();
281
282}
283
284//_____________________________________________________________________________
285AliTRDdigitizer::AliTRDdigitizer(AliRunDigitizer *manager
286 , const Text_t *name, const Text_t *title)
287 :AliDigitizer(manager,name,title)
288{
289 //
290 // AliTRDdigitizer constructor
f7336fa3 291 //
292
abaf1f1d 293 fInputFile = NULL;
294
295 fDigitsManager = NULL;
296 fSDigitsManager = NULL;
297 fSDigitsManagerList = NULL;
f7336fa3 298
abaf1f1d 299 fTRD = NULL;
300 fGeo = NULL;
301 fPRFsmp = NULL;
302 fTRFsmp = NULL;
bfc40adc 303 fCTsmp = NULL;
304
305 fMasks = 0;
306
307 fEvent = 0;
308
309 fCompress = kTRUE;
310 fDebug = 0;
311 fSDigits = kFALSE;
312
313 Init();
314
315}
316
317//_____________________________________________________________________________
318AliTRDdigitizer::AliTRDdigitizer(AliRunDigitizer *manager)
319 :AliDigitizer(manager,"AliTRDdigitizer","TRD digitizer")
320{
321 //
322 // AliTRDdigitizer constructor
323 //
324
325 fInputFile = NULL;
326
327 fDigitsManager = NULL;
328 fSDigitsManager = NULL;
329 fSDigitsManagerList = NULL;
330
331 fTRD = NULL;
332 fGeo = NULL;
333 fPRFsmp = NULL;
334 fTRFsmp = NULL;
e23fbb27 335 fCTsmp = NULL;
336
337 fMasks = 0;
f7336fa3 338
abaf1f1d 339 fEvent = 0;
340
341 fCompress = kTRUE;
e23fbb27 342 fDebug = 0;
abaf1f1d 343 fSDigits = kFALSE;
793ff80c 344
f7336fa3 345 Init();
346
347}
348
349//_____________________________________________________________________________
dd9a6ee3 350AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
8230f242 351{
352 //
353 // AliTRDdigitizer copy constructor
354 //
355
dd9a6ee3 356 ((AliTRDdigitizer &) d).Copy(*this);
8230f242 357
358}
359
360//_____________________________________________________________________________
f7336fa3 361AliTRDdigitizer::~AliTRDdigitizer()
362{
8230f242 363 //
364 // AliTRDdigitizer destructor
365 //
f7336fa3 366
367 if (fInputFile) {
368 fInputFile->Close();
369 delete fInputFile;
abaf1f1d 370 fInputFile = NULL;
371 }
372
373 if (fDigitsManager) {
374 delete fDigitsManager;
375 fDigitsManager = NULL;
f7336fa3 376 }
377
abaf1f1d 378 if (fSDigitsManager) {
379 delete fSDigitsManager;
380 fSDigitsManager = NULL;
f7336fa3 381 }
382
abaf1f1d 383 if (fSDigitsManagerList) {
abaf1f1d 384 delete fSDigitsManagerList;
385 fSDigitsManagerList = NULL;
386 }
a1c3aded 387
388 if (fTRFsmp) {
e23fbb27 389 delete [] fTRFsmp;
a1c3aded 390 fTRFsmp = NULL;
391 }
392
393 if (fPRFsmp) {
e23fbb27 394 delete [] fPRFsmp;
a1c3aded 395 fPRFsmp = NULL;
396 }
397
e23fbb27 398 if (fCTsmp) {
399 delete [] fCTsmp;
400 fCTsmp = NULL;
401 }
402
403 if (fMasks) {
404 delete [] fMasks;
405 fMasks = 0;
406 }
407
f7336fa3 408}
409
410//_____________________________________________________________________________
dd9a6ee3 411AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
412{
413 //
414 // Assignment operator
415 //
416
417 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
418 return *this;
419
420}
421
422//_____________________________________________________________________________
423void AliTRDdigitizer::Copy(TObject &d)
8230f242 424{
425 //
426 // Copy function
427 //
428
1948ba0c 429 Int_t iBin;
430
abaf1f1d 431 ((AliTRDdigitizer &) d).fInputFile = NULL;
432 ((AliTRDdigitizer &) d).fSDigitsManagerList = NULL;
433 ((AliTRDdigitizer &) d).fSDigitsManager = NULL;
434 ((AliTRDdigitizer &) d).fDigitsManager = NULL;
435 ((AliTRDdigitizer &) d).fTRD = NULL;
436 ((AliTRDdigitizer &) d).fGeo = NULL;
437
e23fbb27 438 ((AliTRDdigitizer &) d).fMasks = 0;
439
abaf1f1d 440 ((AliTRDdigitizer &) d).fEvent = 0;
441
442 ((AliTRDdigitizer &) d).fGasGain = fGasGain;
443 ((AliTRDdigitizer &) d).fNoise = fNoise;
444 ((AliTRDdigitizer &) d).fChipGain = fChipGain;
445 ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
446 ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
447 ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
448 ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
449 ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
450 ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
451 ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
452 ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
453 ((AliTRDdigitizer &) d).fExBOn = fExBOn;
454 ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
455 ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
456 ((AliTRDdigitizer &) d).fDriftVelocity = fDriftVelocity;
457 ((AliTRDdigitizer &) d).fPadCoupling = fPadCoupling;
458 ((AliTRDdigitizer &) d).fTimeCoupling = fTimeCoupling;
459 ((AliTRDdigitizer &) d).fTimeBinWidth = fTimeBinWidth;
460 ((AliTRDdigitizer &) d).fField = fField;
461 ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
462 ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
e23fbb27 463 ((AliTRDdigitizer &) d).fCTOn = fCTOn;
464 ((AliTRDdigitizer &) d).fTCOn = fTCOn;
465 ((AliTRDdigitizer &) d).fTiltingAngle = fTiltingAngle;
abaf1f1d 466
467 ((AliTRDdigitizer &) d).fCompress = fCompress;
e23fbb27 468 ((AliTRDdigitizer &) d).fDebug = fDebug ;
abaf1f1d 469 ((AliTRDdigitizer &) d).fSDigits = fSDigits;
470 ((AliTRDdigitizer &) d).fSDigitsScale = fSDigitsScale;
471
472 ((AliTRDdigitizer &) d).fPRFbin = fPRFbin;
473 ((AliTRDdigitizer &) d).fPRFlo = fPRFlo;
474 ((AliTRDdigitizer &) d).fPRFhi = fPRFhi;
475 ((AliTRDdigitizer &) d).fPRFwid = fPRFwid;
476 ((AliTRDdigitizer &) d).fPRFpad = fPRFpad;
e23fbb27 477 if (((AliTRDdigitizer &) d).fPRFsmp) delete [] ((AliTRDdigitizer &) d).fPRFsmp;
e153aaf6 478 ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin];
1948ba0c 479 for (iBin = 0; iBin < fPRFbin; iBin++) {
e153aaf6 480 ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin];
481 }
abaf1f1d 482 ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
483 ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
484 ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
485 ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
e23fbb27 486 if (((AliTRDdigitizer &) d).fTRFsmp) delete [] ((AliTRDdigitizer &) d).fTRFsmp;
872a7aba 487 ((AliTRDdigitizer &) d).fTRFsmp = new Float_t[fTRFbin];
1948ba0c 488 for (iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 489 ((AliTRDdigitizer &) d).fTRFsmp[iBin] = fTRFsmp[iBin];
6244debe 490 }
e23fbb27 491
492 if (((AliTRDdigitizer &) d).fCTsmp) delete [] ((AliTRDdigitizer &) d).fCTsmp;
493 ((AliTRDdigitizer &) d).fCTsmp = new Float_t[fTRFbin];
494 for (iBin = 0; iBin < fTRFbin; iBin++) {
495 ((AliTRDdigitizer &) d).fCTsmp[iBin] = fCTsmp[iBin];
496 }
497
498 ((AliTRDdigitizer &) d).fTCnexp = fTCnexp;
499
500}
501
502//_____________________________________________________________________________
503Float_t AliTRDdigitizer::CrossTalk(Float_t time)
504{
505 //
506 // Applies the pad-pad capacitive cross talk
507 //
508
509 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
510 if ((iBin >= 0) && (iBin < fTRFbin)) {
511 return fCTsmp[iBin];
512 }
513 else {
514 return 0.0;
515 }
516
8230f242 517}
518
519//_____________________________________________________________________________
f7336fa3 520Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz)
521{
522 //
523 // Applies the diffusion smearing to the position of a single electron
524 //
525
526 Float_t driftSqrt = TMath::Sqrt(driftlength);
527 Float_t sigmaT = driftSqrt * fDiffusionT;
528 Float_t sigmaL = driftSqrt * fDiffusionL;
529 xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
530 xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
531 xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
793ff80c 532
f7336fa3 533 return 1;
534
535}
536
537//_____________________________________________________________________________
538Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz)
539{
540 //
541 // Applies E x B effects to the position of a single electron
542 //
543
544 xyz[0] = xyz[0];
793ff80c 545 xyz[1] = xyz[1] + fOmegaTau * driftlength;
f7336fa3 546 xyz[2] = xyz[2];
547
548 return 1;
549
550}
551
552//_____________________________________________________________________________
e23fbb27 553Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist
554 , Int_t plane, Float_t *pad)
793ff80c 555{
556 //
557 // Applies the pad response
558 //
559
e23fbb27 560 const Int_t kNplan = AliTRDgeometry::kNplan;
561
562 Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid));
563 Int_t iOff = plane * fPRFbin;
e153aaf6 564
e23fbb27 565 Int_t iBin0 = iBin - fPRFpad + iOff;
566 Int_t iBin1 = iBin + iOff;
567 Int_t iBin2 = iBin + fPRFpad + iOff;
e153aaf6 568
e23fbb27 569 if ((iBin0 >= 0) && (iBin2 < (fPRFbin*kNplan))) {
e153aaf6 570
571 pad[0] = signal * fPRFsmp[iBin0];
572 pad[1] = signal * fPRFsmp[iBin1];
573 pad[2] = signal * fPRFsmp[iBin2];
574
793ff80c 575 return 1;
e153aaf6 576
793ff80c 577 }
578 else {
e153aaf6 579
793ff80c 580 return 0;
e153aaf6 581
793ff80c 582 }
583
584}
585
586//_____________________________________________________________________________
587Float_t AliTRDdigitizer::TimeResponse(Float_t time)
588{
589 //
590 // Applies the preamp shaper time response
591 //
592
593 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
594 if ((iBin >= 0) && (iBin < fTRFbin)) {
872a7aba 595 return fTRFsmp[iBin];
793ff80c 596 }
597 else {
598 return 0.0;
599 }
600
601}
602
603//_____________________________________________________________________________
e23fbb27 604Float_t AliTRDdigitizer::Col0Tilted(Float_t col0, Float_t rowOffset
605 , Int_t plane)
606{
607 //
608 // Calculates col0 for tilted pads
609 //
610
611 Float_t diff = fTiltingAngle * rowOffset;
612 return (col0 + TMath::Power(-1.0,plane) * diff);
613
614}
615
616//_____________________________________________________________________________
617void AliTRDdigitizer::Exec(Option_t* option)
618{
619 //
620 // Executes the merging
621 //
622
623 Int_t iInput;
624
625 AliTRDdigitsManager *sdigitsManager;
626
627 TString optionString = option;
628 if (optionString.Contains("deb")) {
629 fDebug = 1;
630 if (optionString.Contains("2")) {
631 fDebug = 2;
632 }
633 printf("<AliTRDdigitizer::Exec> ");
634 printf("Called with debug option %d\n",fDebug);
635 }
636
637 Int_t nInput = fManager->GetNinputs();
638 fMasks = new Int_t[nInput];
639 for (iInput = 0; iInput < nInput; iInput++) {
640 fMasks[iInput] = fManager->GetMask(iInput);
641 }
642
643 // Set the event number
644 fEvent = gAlice->GetEvNumber();
645
646 // Initialization
647 InitDetector();
648
649 for (iInput = 0; iInput < nInput; iInput++) {
650
651 if (fDebug > 0) {
652 printf("<AliTRDdigitizer::Exec> ");
653 printf("Add input stream %d\n",iInput);
654 }
655
656 // Read the s-digits via digits manager
657 sdigitsManager = new AliTRDdigitsManager();
658 sdigitsManager->SetDebug(fDebug);
659 sdigitsManager->SetSDigits(kTRUE);
660 sdigitsManager->ReadDigits(fManager->GetInputTreeTRDS(iInput));
661
662 // Add the s-digits to the input list
663 AddSDigitsManager(sdigitsManager);
664
665 }
666
667 // Convert the s-digits to normal digits
668 if (fDebug > 0) {
669 printf("<AliTRDdigitizer::Exec> ");
670 printf("Do the conversion\n");
671 }
672 SDigits2Digits();
673
674 // Store the digits
675 if (fDebug > 0) {
676 printf("<AliTRDdigitizer::Exec> ");
677 printf("Write the digits\n");
678 }
679 fDigitsManager->MakeBranch(fManager->GetTreeDTRD());
680 fDigitsManager->WriteDigits();
681 if (fDebug > 0) {
682 printf("<AliTRDdigitizer::Exec> ");
683 printf("Done\n");
684 }
685
b1113c6b 686 DeleteSDigitsManager();
687
e23fbb27 688}
689
690//_____________________________________________________________________________
85cbec76 691Bool_t AliTRDdigitizer::Init()
f7336fa3 692{
693 //
694 // Initializes the digitization procedure with standard values
695 //
696
697 // The default parameter for the digitization
db30bf0f 698 fGasGain = 2800.;
699 fChipGain = 6.1;
6244debe 700 fNoise = 1000.;
701 fADCoutRange = 1023.; // 10-bit ADC
a3c76cdc 702 fADCinRange = 1000.; // 1V input range
6244debe 703 fADCthreshold = 1;
704
705 // For the summable digits
abaf1f1d 706 fSDigitsScale = 100.;
f7336fa3 707
db30bf0f 708 // The drift velocity (cm / mus)
709 fDriftVelocity = 1.5;
710
db30bf0f 711 // Diffusion on
6244debe 712 fDiffusionOn = 1;
db30bf0f 713
714 // E x B effects
715 fExBOn = 0;
f7336fa3 716
717 // Propability for electron attachment
6244debe 718 fElAttachOn = 0;
719 fElAttachProp = 0.0;
f7336fa3 720
da581aea 721 // The pad response function
e23fbb27 722 fPRFOn = 1;
872a7aba 723
724 // The time response function
e23fbb27 725 fTRFOn = 1;
726
727 // The cross talk
728 fCTOn = 0;
729
730 // The tail cancelation
731 fTCOn = 1;
732
733 // The number of exponentials
734 fTCnexp = 2;
da581aea 735
6244debe 736 // The pad coupling factor (same number as for the TPC)
737 fPadCoupling = 0.5;
738
739 // The time coupling factor (same number as for the TPC)
740 fTimeCoupling = 0.4;
741
e23fbb27 742 // The tilting angle for the readout pads
743 SetTiltingAngle(5.0);
744
85cbec76 745 return kTRUE;
746
6244debe 747}
748
749//_____________________________________________________________________________
85cbec76 750Bool_t AliTRDdigitizer::ReInit()
6244debe 751{
752 //
872a7aba 753 // Reinitializes the digitization procedure after a change in the parameter
6244debe 754 //
755
872a7aba 756 if (!fGeo) {
757 printf("AliTRDdigitizer::ReInit -- ");
758 printf("No geometry defined. Run InitDetector() first\n");
85cbec76 759 return kFALSE;
872a7aba 760 }
761
6244debe 762 // Calculate the time bin width in ns
763 fTimeBinWidth = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
764
872a7aba 765 // The range and the binwidth for the sampled TRF
766 fTRFbin = 100;
db30bf0f 767 // Start 0.2 mus before the signal
768 fTRFlo = -0.2 * fDriftVelocity;
872a7aba 769 // End the maximum driftlength after the signal
770 fTRFhi = AliTRDgeometry::DrThick()
771 + fGeo->GetTimeAfter() * fGeo->GetTimeBinSize();
772 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
6244debe 773
db30bf0f 774 // Transverse and longitudinal diffusion coefficients (Xe/CO2)
775 fDiffusionT = GetDiffusionT(fDriftVelocity,fField);
776 fDiffusionL = GetDiffusionL(fDriftVelocity,fField);
777
778 // omega * tau.= tan(Lorentz-angle)
779 fOmegaTau = GetOmegaTau(fDriftVelocity,fField);
780
6244debe 781 // The Lorentz factor
782 if (fExBOn) {
783 fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
784 }
785 else {
786 fLorentzFactor = 1.0;
787 }
793ff80c 788
85cbec76 789 return kTRUE;
790
793ff80c 791}
792
793//_____________________________________________________________________________
6244debe 794void AliTRDdigitizer::SampleTRF()
793ff80c 795{
796 //
6244debe 797 // Samples the time response function
e23fbb27 798 //
799 // New TRF from Venelin Angelov, simulated with CADENCE
800 // Pad-ground capacitance = 25 pF
801 // Pad-pad cross talk capacitance = 6 pF
793ff80c 802 //
803
872a7aba 804 Int_t ipos1;
805 Int_t ipos2;
806 Float_t diff;
807
e23fbb27 808 const Int_t kNpasa = 252;
809
810 Float_t time[kNpasa] = { -0.220000, -0.210000, -0.200000, -0.190000
811 , -0.180000, -0.170000, -0.160000, -0.150000
812 , -0.140000, -0.130000, -0.120000, -0.110000
813 , -0.100000, -0.090000, -0.080000, -0.070000
814 , -0.060000, -0.050000, -0.040000, -0.030000
815 , -0.020000, -0.010000, -0.000000, 0.010000
816 , 0.020000, 0.030000, 0.040000, 0.050000
817 , 0.060000, 0.070000, 0.080000, 0.090000
818 , 0.100000, 0.110000, 0.120000, 0.130000
819 , 0.140000, 0.150000, 0.160000, 0.170000
820 , 0.180000, 0.190000, 0.200000, 0.210000
821 , 0.220000, 0.230000, 0.240000, 0.250000
822 , 0.260000, 0.270000, 0.280000, 0.290000
823 , 0.300000, 0.310000, 0.320000, 0.330000
824 , 0.340000, 0.350000, 0.360000, 0.370000
825 , 0.380000, 0.390000, 0.400000, 0.410000
826 , 0.420000, 0.430000, 0.440000, 0.450000
827 , 0.460000, 0.470000, 0.480000, 0.490000
828 , 0.500000, 0.510000, 0.520000, 0.530000
829 , 0.540000, 0.550000, 0.560000, 0.570000
830 , 0.580000, 0.590000, 0.600000, 0.610000
831 , 0.620000, 0.630000, 0.640000, 0.650000
832 , 0.660000, 0.670000, 0.680000, 0.690000
833 , 0.700000, 0.710000, 0.720000, 0.730000
834 , 0.740000, 0.750000, 0.760000, 0.770000
835 , 0.780000, 0.790000, 0.800000, 0.810000
836 , 0.820000, 0.830000, 0.840000, 0.850000
837 , 0.860000, 0.870000, 0.880000, 0.890000
838 , 0.900000, 0.910000, 0.920000, 0.930000
839 , 0.940000, 0.950000, 0.960000, 0.970000
840 , 0.980000, 0.990000, 1.000000, 1.010000
841 , 1.020000, 1.030000, 1.040000, 1.050000
842 , 1.060000, 1.070000, 1.080000, 1.090000
843 , 1.100000, 1.110000, 1.120000, 1.130000
844 , 1.140000, 1.150000, 1.160000, 1.170000
845 , 1.180000, 1.190000, 1.200000, 1.210000
846 , 1.220000, 1.230000, 1.240000, 1.250000
847 , 1.260000, 1.270000, 1.280000, 1.290000
848 , 1.300000, 1.310000, 1.320000, 1.330000
849 , 1.340000, 1.350000, 1.360000, 1.370000
850 , 1.380000, 1.390000, 1.400000, 1.410000
851 , 1.420000, 1.430000, 1.440000, 1.450000
852 , 1.460000, 1.470000, 1.480000, 1.490000
853 , 1.500000, 1.510000, 1.520000, 1.530000
854 , 1.540000, 1.550000, 1.560000, 1.570000
855 , 1.580000, 1.590000, 1.600000, 1.610000
856 , 1.620000, 1.630000, 1.640000, 1.650000
857 , 1.660000, 1.670000, 1.680000, 1.690000
858 , 1.700000, 1.710000, 1.720000, 1.730000
859 , 1.740000, 1.750000, 1.760000, 1.770000
860 , 1.780000, 1.790000, 1.800000, 1.810000
861 , 1.820000, 1.830000, 1.840000, 1.850000
862 , 1.860000, 1.870000, 1.880000, 1.890000
863 , 1.900000, 1.910000, 1.920000, 1.930000
864 , 1.940000, 1.950000, 1.960000, 1.970000
865 , 1.980000, 1.990000, 2.000000, 2.010000
866 , 2.020000, 2.030000, 2.040000, 2.050000
867 , 2.060000, 2.070000, 2.080000, 2.090000
868 , 2.100000, 2.110000, 2.120000, 2.130000
869 , 2.140000, 2.150000, 2.160000, 2.170000
870 , 2.180000, 2.190000, 2.200000, 2.210000
871 , 2.220000, 2.230000, 2.240000, 2.250000
872 , 2.260000, 2.270000, 2.280000, 2.290000 };
873
874 Float_t signal[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
875 , 0.000000, 0.000000, 0.000000, 0.000396
876 , 0.005096, 0.022877, 0.061891, 0.126614
877 , 0.215798, 0.324406, 0.444507, 0.566817
878 , 0.683465, 0.787089, 0.873159, 0.937146
879 , 0.979049, 0.999434, 1.000000, 0.983579
880 , 0.954134, 0.913364, 0.866365, 0.813703
881 , 0.759910, 0.706116, 0.653454, 0.603624
882 , 0.556625, 0.514156, 0.475085, 0.439977
883 , 0.408834, 0.380578, 0.355549, 0.333352
884 , 0.313647, 0.296093, 0.280351, 0.266195
885 , 0.253397, 0.241789, 0.231257, 0.221574
886 , 0.212627, 0.204417, 0.196772, 0.189581
887 , 0.182956, 0.176784, 0.171008, 0.165515
888 , 0.160419, 0.155606, 0.151076, 0.146716
889 , 0.142639, 0.138845, 0.135221, 0.131767
890 , 0.128482, 0.125368, 0.122424, 0.119592
891 , 0.116931, 0.114326, 0.111891, 0.109513
892 , 0.107248, 0.105096, 0.103058, 0.101019
893 , 0.099151, 0.097282, 0.095527, 0.093715
894 , 0.092129, 0.090544, 0.088958, 0.087429
895 , 0.086014, 0.084598, 0.083239, 0.081880
896 , 0.080634, 0.079388, 0.078143, 0.077010
897 , 0.075878, 0.074745, 0.073669, 0.072593
898 , 0.071574, 0.070612, 0.069649, 0.068686
899 , 0.067780, 0.066874, 0.066025, 0.065176
900 , 0.064326, 0.063533, 0.062684, 0.061948
901 , 0.061212, 0.060419, 0.059740, 0.059003
902 , 0.058324, 0.057644, 0.057022, 0.056342
903 , 0.055663, 0.055096, 0.054473, 0.053851
904 , 0.053284, 0.052718, 0.052152, 0.051585
905 , 0.051019, 0.050566, 0.050000, 0.049490
906 , 0.048981, 0.048528, 0.048018, 0.047508
907 , 0.047055, 0.046602, 0.046149, 0.045696
908 , 0.045300, 0.044904, 0.044451, 0.044054
909 , 0.043658, 0.043205, 0.042865, 0.042469
910 , 0.042072, 0.041733, 0.041336, 0.040997
911 , 0.040657, 0.040260, 0.039921, 0.039581
912 , 0.039241, 0.038958, 0.038618, 0.038335
913 , 0.037995, 0.037656, 0.037373, 0.037089
914 , 0.036806, 0.036467, 0.036183, 0.035900
915 , 0.035617, 0.035334, 0.035108, 0.034824
916 , 0.034541, 0.034315, 0.034032, 0.033805
917 , 0.033522, 0.033296, 0.033069, 0.032786
918 , 0.032559, 0.032333, 0.032106, 0.031880
919 , 0.031653, 0.031427, 0.031200, 0.030974
920 , 0.030804, 0.030578, 0.030351, 0.030125
921 , 0.029955, 0.029785, 0.029558, 0.029332
922 , 0.029162, 0.028992, 0.028766, 0.028596
923 , 0.028426, 0.028199, 0.028086, 0.027860
924 , 0.027746, 0.027633, 0.027463, 0.027293
925 , 0.027180, 0.027067, 0.026954, 0.026954
926 , 0.026840, 0.026727, 0.026727, 0.026614
927 , 0.026614, 0.026614, 0.026557, 0.026501
928 , 0.026501, 0.026501, 0.026501, 0.026501
929 , 0.026501, 0.026501, 0.026501, 0.026387
930 , 0.026387, 0.026387, 0.026387, 0.026387
931 , 0.026387, 0.026387, 0.026387, 0.026387
932 , 0.026387, 0.026387, 0.026387, 0.026387
933 , 0.026387, 0.026274, 0.026274, 0.026274
934 , 0.026274, 0.026274, 0.026274, 0.026274
935 , 0.026274, 0.026274, 0.026274, 0.026274
936 , 0.026274, 0.026274, 0.026274, 0.026161 };
937
938 Float_t xtalk[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
939 , 0.000000, 0.000000, 0.000000, 0.000113
940 , 0.000793, 0.003058, 0.007305, 0.013194
941 , 0.019706, 0.025821, 0.030634, 0.033465
942 , 0.034145, 0.032729, 0.029615, 0.025198
943 , 0.019989, 0.014496, 0.009003, 0.003964
944 , -0.000510, -0.004190, -0.007191, -0.009400
945 , -0.010872, -0.011835, -0.012288, -0.012288
946 , -0.012005, -0.011495, -0.010872, -0.010136
947 , -0.009343, -0.008607, -0.007871, -0.007191
948 , -0.006512, -0.005946, -0.005379, -0.004926
949 , -0.004473, -0.004077, -0.003737, -0.003398
950 , -0.003114, -0.002831, -0.002605, -0.002378
951 , -0.002208, -0.002039, -0.001869, -0.001699
952 , -0.001585, -0.001472, -0.001359, -0.001246
953 , -0.001132, -0.001019, -0.001019, -0.000906
954 , -0.000906, -0.000793, -0.000793, -0.000680
955 , -0.000680, -0.000680, -0.000566, -0.000566
956 , -0.000566, -0.000566, -0.000453, -0.000453
957 , -0.000453, -0.000453, -0.000453, -0.000453
958 , -0.000340, -0.000340, -0.000340, -0.000340
959 , -0.000340, -0.000340, -0.000340, -0.000340
960 , -0.000340, -0.000340, -0.000340, -0.000340
961 , -0.000340, -0.000227, -0.000227, -0.000227
962 , -0.000227, -0.000227, -0.000227, -0.000227
963 , -0.000227, -0.000227, -0.000227, -0.000227
964 , -0.000227, -0.000227, -0.000227, -0.000227
965 , -0.000227, -0.000227, -0.000227, -0.000227
966 , -0.000227, -0.000227, -0.000227, -0.000227
967 , -0.000227, -0.000227, -0.000227, -0.000227
968 , -0.000227, -0.000227, -0.000227, -0.000227
969 , -0.000227, -0.000227, -0.000227, -0.000227
970 , -0.000227, -0.000227, -0.000227, -0.000113
971 , -0.000113, -0.000113, -0.000113, -0.000113
972 , -0.000113, -0.000113, -0.000113, -0.000113
973 , -0.000113, -0.000113, -0.000113, -0.000113
974 , -0.000113, -0.000113, -0.000113, -0.000113
975 , -0.000113, -0.000113, -0.000113, -0.000113
976 , -0.000113, -0.000113, -0.000113, -0.000113
977 , -0.000113, -0.000113, -0.000113, -0.000113
978 , -0.000113, -0.000113, -0.000113, -0.000113
979 , -0.000113, -0.000113, -0.000113, -0.000113
980 , -0.000113, -0.000113, -0.000113, -0.000113
981 , -0.000113, -0.000113, -0.000113, -0.000113
982 , -0.000113, -0.000113, -0.000113, -0.000113
983 , -0.000113, -0.000113, -0.000113, -0.000113
984 , -0.000113, -0.000113, -0.000113, -0.000113
985 , -0.000113, -0.000113, -0.000113, -0.000113
986 , -0.000113, -0.000113, -0.000113, -0.000113
987 , -0.000113, -0.000113, -0.000113, -0.000113
988 , -0.000113, -0.000113, -0.000113, -0.000113
989 , -0.000113, -0.000113, -0.000113, -0.000113
990 , -0.000113, -0.000113, -0.000113, 0.000000
991 , 0.000000, 0.000000, 0.000000, 0.000000
992 , 0.000000, 0.000000, 0.000000, 0.000000
993 , 0.000000, 0.000000, 0.000000, 0.000000
994 , 0.000000, 0.000000, 0.000000, 0.000000
995 , 0.000000, 0.000000, 0.000000, 0.000000
996 , 0.000000, 0.000000, 0.000000, 0.000000
997 , 0.000000, 0.000000, 0.000000, 0.000000
998 , 0.000000, 0.000000, 0.000000, 0.000000
999 , 0.000000, 0.000000, 0.000000, 0.000000
1000 , 0.000000, 0.000000, 0.000000, 0.000000 };
1001
1002 // increase CrossTalk to measurements
1003 for (Int_t ipasa = 0; ipasa < kNpasa; ipasa++) {
1004 xtalk[ipasa] *= 1.75;
1005 }
1006
1007 if (fTRFsmp) delete [] fTRFsmp;
872a7aba 1008 fTRFsmp = new Float_t[fTRFbin];
e23fbb27 1009 if (fCTsmp) delete [] fCTsmp;
1010 fCTsmp = new Float_t[fTRFbin];
872a7aba 1011
1012 Float_t loTRF = TMath::Max(fTRFlo / fDriftVelocity,time[0]);
1013 Float_t hiTRF = TMath::Min(fTRFhi / fDriftVelocity,time[kNpasa-1]);
793ff80c 1014 Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
872a7aba 1015
1016 // Take the linear interpolation
793ff80c 1017 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 1018
6244debe 1019 Float_t bin = (((Float_t) iBin) + 0.5) * binWidth + loTRF;
872a7aba 1020 ipos1 = ipos2 = 0;
1021 diff = 0;
1022 do {
1023 diff = bin - time[ipos2++];
1024 } while (diff > 0);
1025 ipos2--;
e23fbb27 1026 if (ipos2 >= kNpasa) ipos2 = kNpasa - 1;
872a7aba 1027 ipos1 = ipos2 - 1;
1028
1029 fTRFsmp[iBin] = signal[ipos2]
1030 + diff * (signal[ipos2] - signal[ipos1])
1031 / ( time[ipos2] - time[ipos1]);
1032
e23fbb27 1033 fCTsmp[iBin] = xtalk[ipos2]
1034 + diff * (xtalk[ipos2] - xtalk[ipos1])
1035 / ( time[ipos2] - time[ipos1]);
1036
793ff80c 1037 }
1038
f7336fa3 1039}
1040
1041//_____________________________________________________________________________
e153aaf6 1042void AliTRDdigitizer::SamplePRF()
1043{
1044 //
1045 // Samples the pad response function
1046 //
1047
e23fbb27 1048 const Int_t kNplan = AliTRDgeometry::kNplan;
db30bf0f 1049 const Int_t kPRFbin = 61;
e23fbb27 1050
1051 Float_t prf[kNplan][kPRFbin] = { { 0.018570, 0.022270, 0.026710, 0.032010
1052 , 0.038350, 0.045920, 0.054930, 0.065650
1053 , 0.078370, 0.093420, 0.111150, 0.131940
1054 , 0.156160, 0.184160, 0.216220, 0.252470
1055 , 0.292860, 0.337030, 0.384330, 0.433750
1056 , 0.484010, 0.533630, 0.581150, 0.625200
1057 , 0.664710, 0.698860, 0.727130, 0.749230
1058 , 0.765050, 0.774540, 0.777700, 0.774540
1059 , 0.765050, 0.749230, 0.727130, 0.698860
1060 , 0.664710, 0.625200, 0.581150, 0.533630
1061 , 0.484010, 0.433750, 0.384330, 0.337030
1062 , 0.292860, 0.252470, 0.216220, 0.184160
1063 , 0.156160, 0.131940, 0.111150, 0.093420
1064 , 0.078370, 0.065650, 0.054930, 0.045920
1065 , 0.038350, 0.032010, 0.026710, 0.022270
1066 , 0.018570 }
1067 , { 0.015730, 0.019040, 0.023030, 0.027840
1068 , 0.033650, 0.040650, 0.049060, 0.059160
1069 , 0.071260, 0.085710, 0.102910, 0.123270
1070 , 0.147240, 0.175220, 0.207590, 0.244540
1071 , 0.286090, 0.331920, 0.381350, 0.433290
1072 , 0.486290, 0.538710, 0.588870, 0.635280
1073 , 0.676760, 0.712460, 0.741890, 0.764810
1074 , 0.781150, 0.790930, 0.794180, 0.790930
1075 , 0.781150, 0.764810, 0.741890, 0.712460
1076 , 0.676760, 0.635280, 0.588870, 0.538710
1077 , 0.486290, 0.433290, 0.381350, 0.331920
1078 , 0.286090, 0.244540, 0.207590, 0.175220
1079 , 0.147240, 0.123270, 0.102910, 0.085710
1080 , 0.071260, 0.059160, 0.049060, 0.040650
1081 , 0.033650, 0.027840, 0.023030, 0.019040
1082 , 0.015730 }
1083 , { 0.013330, 0.016270, 0.019850, 0.024210
1084 , 0.029510, 0.035960, 0.043790, 0.053280
1085 , 0.064740, 0.078580, 0.095190, 0.115070
1086 , 0.138700, 0.166570, 0.199120, 0.236660
1087 , 0.279260, 0.326660, 0.378140, 0.432540
1088 , 0.488260, 0.543440, 0.596200, 0.644900
1089 , 0.688240, 0.725380, 0.755840, 0.779470
1090 , 0.796260, 0.806280, 0.809610, 0.806280
1091 , 0.796260, 0.779470, 0.755840, 0.725380
1092 , 0.688240, 0.644900, 0.596200, 0.543440
1093 , 0.488260, 0.432540, 0.378140, 0.326660
1094 , 0.279260, 0.236660, 0.199120, 0.166570
1095 , 0.138700, 0.115070, 0.095190, 0.078580
1096 , 0.064740, 0.053280, 0.043790, 0.035960
1097 , 0.029510, 0.024210, 0.019850, 0.016270
1098 , 0.013330 }
1099 , { 0.011280, 0.013890, 0.017090, 0.021030
1100 , 0.025870, 0.031800, 0.039060, 0.047940
1101 , 0.058790, 0.071980, 0.087990, 0.107330
1102 , 0.130550, 0.158220, 0.190850, 0.228870
1103 , 0.272410, 0.321270, 0.374740, 0.431560
1104 , 0.489960, 0.547870, 0.603180, 0.654080
1105 , 0.699190, 0.737640, 0.769030, 0.793260
1106 , 0.810410, 0.820620, 0.824010, 0.820620
1107 , 0.810410, 0.793260, 0.769030, 0.737640
1108 , 0.699190, 0.654080, 0.603180, 0.547870
1109 , 0.489960, 0.431560, 0.374740, 0.321270
1110 , 0.272410, 0.228870, 0.190850, 0.158220
1111 , 0.130550, 0.107330, 0.087990, 0.071980
1112 , 0.058790, 0.047940, 0.039060, 0.031800
1113 , 0.025870, 0.021030, 0.017090, 0.013890
1114 , 0.011280 }
1115 , { 0.009550, 0.011860, 0.014720, 0.018270
1116 , 0.022660, 0.028100, 0.034820, 0.043120
1117 , 0.053340, 0.065900, 0.081280, 0.100040
1118 , 0.122800, 0.150180, 0.182800, 0.221170
1119 , 0.265550, 0.315790, 0.371180, 0.430370
1120 , 0.491430, 0.552030, 0.609840, 0.662860
1121 , 0.709630, 0.749290, 0.781490, 0.806220
1122 , 0.823650, 0.834000, 0.837430, 0.834000
1123 , 0.823650, 0.806220, 0.781490, 0.749290
1124 , 0.709630, 0.662860, 0.609840, 0.552030
1125 , 0.491430, 0.430370, 0.371180, 0.315790
1126 , 0.265550, 0.221170, 0.182800, 0.150180
1127 , 0.122800, 0.100040, 0.081280, 0.065900
1128 , 0.053340, 0.043120, 0.034820, 0.028100
1129 , 0.022660, 0.018270, 0.014720, 0.011860
1130 , 0.009550 }
1131 , { 0.008080, 0.010120, 0.012670, 0.015860
1132 , 0.019840, 0.024820, 0.031030, 0.038760
1133 , 0.048370, 0.060300, 0.075040, 0.093200
1134 , 0.115430, 0.142450, 0.174980, 0.213610
1135 , 0.258720, 0.310250, 0.367480, 0.429010
1136 , 0.492690, 0.555950, 0.616210, 0.671280
1137 , 0.719600, 0.760350, 0.793250, 0.818380
1138 , 0.836020, 0.846460, 0.849920, 0.846460
1139 , 0.836020, 0.818380, 0.793250, 0.760350
1140 , 0.719600, 0.671280, 0.616210, 0.555950
1141 , 0.492690, 0.429010, 0.367480, 0.310250
1142 , 0.258720, 0.213610, 0.174980, 0.142450
1143 , 0.115430, 0.093200, 0.075040, 0.060300
1144 , 0.048370, 0.038760, 0.031030, 0.024820
1145 , 0.019840, 0.015860, 0.012670, 0.010120
1146 , 0.008080 } };
db30bf0f 1147
1148 fPRFlo = -1.5;
1149 fPRFhi = 1.5;
1150 fPRFbin = kPRFbin;
1151 fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin);
1152 fPRFpad = ((Int_t) (1.0 / fPRFwid));
1153
e23fbb27 1154 if (fPRFsmp) delete [] fPRFsmp;
1155 fPRFsmp = new Float_t[kNplan*fPRFbin];
1156 for (Int_t iPla = 0; iPla < kNplan; iPla++) {
1157 for (Int_t iBin = 0; iBin < fPRFbin; iBin++) {
1158 fPRFsmp[iPla*kPRFbin+iBin] = prf[iPla][iBin];
1159 }
1160 }
e153aaf6 1161
1162}
1163
1164//_____________________________________________________________________________
e23fbb27 1165Bool_t AliTRDdigitizer::Open(const Char_t *file, Int_t nEvent)
f7336fa3 1166{
1167 //
1168 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
1169 //
1170
1171 // Connect the AliRoot file containing Geometry, Kine, and Hits
e23fbb27 1172 fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(file);
f7336fa3 1173 if (!fInputFile) {
e23fbb27 1174 if (fDebug > 0) {
1175 printf("<AliTRDdigitizer::Open> ");
1176 printf("Open the AliROOT-file %s.\n",file);
abaf1f1d 1177 }
e23fbb27 1178 fInputFile = new TFile(file,"UPDATE");
f7336fa3 1179 }
1180 else {
e23fbb27 1181 if (fDebug > 0) {
1182 printf("<AliTRDdigitizer::Open> ");
1183 printf("%s is already open.\n",file);
abaf1f1d 1184 }
f7336fa3 1185 }
1186
da581aea 1187 gAlice = (AliRun*) fInputFile->Get("gAlice");
1188 if (gAlice) {
e23fbb27 1189 if (fDebug > 0) {
1190 printf("<AliTRDdigitizer::Open> ");
abaf1f1d 1191 printf("AliRun object found on file.\n");
1192 }
da581aea 1193 }
1194 else {
e23fbb27 1195 printf("<AliTRDdigitizer::Open> ");
da581aea 1196 printf("Could not find AliRun object.\n");
1197 return kFALSE;
1198 }
f7336fa3 1199
1200 fEvent = nEvent;
1201
1202 // Import the Trees for the event nEvent in the file
1203 Int_t nparticles = gAlice->GetEvent(fEvent);
1204 if (nparticles <= 0) {
e23fbb27 1205 printf("<AliTRDdigitizer::Open> ");
f7336fa3 1206 printf("No entries in the trees for event %d.\n",fEvent);
1207 return kFALSE;
1208 }
1209
abaf1f1d 1210 if (InitDetector()) {
1211 return MakeBranch();
1212 }
1213 else {
1214 return kFALSE;
1215 }
793ff80c 1216
1217}
1218
1219//_____________________________________________________________________________
1220Bool_t AliTRDdigitizer::InitDetector()
1221{
1222 //
1223 // Sets the pointer to the TRD detector and the geometry
1224 //
1225
dd9a6ee3 1226 // Get the pointer to the detector class and check for version 1
1227 fTRD = (AliTRD*) gAlice->GetDetector("TRD");
1228 if (fTRD->IsVersion() != 1) {
e23fbb27 1229 printf("<AliTRDdigitizer::InitDetector> ");
dd9a6ee3 1230 printf("TRD must be version 1 (slow simulator).\n");
1231 exit(1);
1232 }
1233
1234 // Get the geometry
1235 fGeo = fTRD->GetGeometry();
e23fbb27 1236 if (fDebug > 0) {
1237 printf("<AliTRDdigitizer::InitDetector> ");
abaf1f1d 1238 printf("Geometry version %d\n",fGeo->IsVersion());
1239 }
dd9a6ee3 1240
88fd7ccb 1241 // The magnetic field strength in Tesla
1242 fField = 0.2 * gAlice->Field()->Factor();
1243
abaf1f1d 1244 // Create a digits manager
1245 fDigitsManager = new AliTRDdigitsManager();
1246 fDigitsManager->SetSDigits(fSDigits);
1247 fDigitsManager->CreateArrays();
1248 fDigitsManager->SetEvent(fEvent);
e23fbb27 1249 fDigitsManager->SetDebug(fDebug);
abaf1f1d 1250
1251 // The list for the input s-digits manager to be merged
1252 fSDigitsManagerList = new TList();
1253
85cbec76 1254 return ReInit();
f7336fa3 1255
1256}
1257
1258//_____________________________________________________________________________
abaf1f1d 1259Bool_t AliTRDdigitizer::MakeBranch(const Char_t *file)
6244debe 1260{
abaf1f1d 1261 //
1262 // Create the branches for the digits array
6244debe 1263 //
1264
abaf1f1d 1265 return fDigitsManager->MakeBranch(file);
6244debe 1266
1267}
1268
1269//_____________________________________________________________________________
f7336fa3 1270Bool_t AliTRDdigitizer::MakeDigits()
1271{
1272 //
872a7aba 1273 // Creates digits.
f7336fa3 1274 //
1275
f7336fa3 1276 ///////////////////////////////////////////////////////////////
1277 // Parameter
1278 ///////////////////////////////////////////////////////////////
1279
1280 // Converts number of electrons to fC
872a7aba 1281 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
f7336fa3 1282
1283 ///////////////////////////////////////////////////////////////
1284
793ff80c 1285 // Number of pads included in the pad response
1286 const Int_t kNpad = 3;
1287
1288 // Number of track dictionary arrays
dd56b762 1289 const Int_t kNDict = AliTRDdigitsManager::kNDict;
793ff80c 1290
872a7aba 1291 // Half the width of the amplification region
1292 const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
1293
c3a4830f 1294 Int_t iRow, iCol, iTime, iPad;
71d9fa7b 1295 Int_t iDict = 0;
793ff80c 1296 Int_t nBytes = 0;
f7336fa3 1297
1298 Int_t totalSizeDigits = 0;
1299 Int_t totalSizeDict0 = 0;
1300 Int_t totalSizeDict1 = 0;
1301 Int_t totalSizeDict2 = 0;
1302
872a7aba 1303 Int_t timeTRDbeg = 0;
1304 Int_t timeTRDend = 1;
1305
1306 Float_t pos[3];
1307 Float_t rot[3];
1308 Float_t xyz[3];
1309 Float_t padSignal[kNpad];
1310 Float_t signalOld[kNpad];
1311
793ff80c 1312 AliTRDdataArrayF *signals = 0;
1313 AliTRDdataArrayI *digits = 0;
8230f242 1314 AliTRDdataArrayI *dictionary[kNDict];
da581aea 1315
793ff80c 1316 // Create a container for the amplitudes
1317 AliTRDsegmentArray *signalsArray
e23fbb27 1318 = new AliTRDsegmentArray("AliTRDdataArrayF"
1319 ,AliTRDgeometry::Ndet());
793ff80c 1320
872a7aba 1321 if (fTRFOn) {
1322 timeTRDbeg = ((Int_t) (-fTRFlo / fGeo->GetTimeBinSize())) - 1;
1323 timeTRDend = ((Int_t) ( fTRFhi / fGeo->GetTimeBinSize())) - 1;
e23fbb27 1324 if (fDebug > 0) {
1325 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1326 printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
1327 }
da581aea 1328 }
1329
872a7aba 1330 Float_t elAttachProp = fElAttachProp / 100.;
f7336fa3 1331
e153aaf6 1332 // Create the sampled PRF
1333 SamplePRF();
1334
6244debe 1335 // Create the sampled TRF
1336 SampleTRF();
793ff80c 1337
872a7aba 1338 if (!fGeo) {
e23fbb27 1339 printf("<AliTRDdigitizer::MakeDigits> ");
872a7aba 1340 printf("No geometry defined\n");
1341 return kFALSE;
1342 }
1343
e23fbb27 1344 if (fDebug > 0) {
1345 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1346 printf("Start creating digits.\n");
1347 }
872a7aba 1348
793ff80c 1349 // Get the pointer to the hit tree
1350 TTree *HitTree = gAlice->TreeH();
1351
1352 // Get the number of entries in the hit tree
1353 // (Number of primary particles creating a hit somewhere)
1354 Int_t nTrack = (Int_t) HitTree->GetEntries();
e23fbb27 1355 if (fDebug > 0) {
1356 printf("<AliTRDdigitizer::MakeDigits> ");
793ff80c 1357 printf("Found %d primary particles\n",nTrack);
1358 }
1359
1360 Int_t detectorOld = -1;
1361 Int_t countHits = 0;
1362
1363 // Loop through all entries in the tree
1364 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
1365
1366 gAlice->ResetHits();
1367 nBytes += HitTree->GetEvent(iTrack);
1368
e23fbb27 1369 // Loop through the TRD hits
1370 Int_t iHit = 0;
1371 AliTRDhit *hit = (AliTRDhit *) fTRD->FirstHit(-1);
1372 while (hit) {
1373
793ff80c 1374 countHits++;
e23fbb27 1375 iHit++;
1376
1377 pos[0] = hit->X();
1378 pos[1] = hit->Y();
1379 pos[2] = hit->Z();
1380 Float_t q = hit->GetCharge();
1381 Int_t track = hit->Track();
1382 Int_t detector = hit->GetDetector();
1383 Int_t plane = fGeo->GetPlane(detector);
1384 Int_t sector = fGeo->GetSector(detector);
1385 Int_t chamber = fGeo->GetChamber(detector);
793ff80c 1386 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1387 Int_t nColMax = fGeo->GetColMax(plane);
1388 Int_t nTimeMax = fGeo->GetTimeMax();
872a7aba 1389 Int_t nTimeBefore = fGeo->GetTimeBefore();
1390 Int_t nTimeAfter = fGeo->GetTimeAfter();
1391 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 1392 Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
1393 Float_t col0 = fGeo->GetCol0(plane);
1394 Float_t time0 = fGeo->GetTime0(plane);
71d9fa7b 1395 Float_t rowPadSize = fGeo->GetRowPadSize(plane,chamber,sector);
1396 Float_t colPadSize = fGeo->GetColPadSize(plane);
793ff80c 1397 Float_t timeBinSize = fGeo->GetTimeBinSize();
872a7aba 1398 Float_t divideRow = 1.0 / rowPadSize;
1399 Float_t divideCol = 1.0 / colPadSize;
1400 Float_t divideTime = 1.0 / timeBinSize;
793ff80c 1401
e23fbb27 1402 if (fDebug > 1) {
793ff80c 1403 printf("Analyze hit no. %d ",iHit);
1404 printf("-----------------------------------------------------------\n");
1405 hit->Dump();
1406 printf("plane = %d, sector = %d, chamber = %d\n"
1407 ,plane,sector,chamber);
1408 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
1409 ,nRowMax,nColMax,nTimeMax);
872a7aba 1410 printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
1411 ,nTimeBefore,nTimeAfter,nTimeTotal);
793ff80c 1412 printf("row0 = %f, col0 = %f, time0 = %f\n"
1413 ,row0,col0,time0);
c1e4b257 1414 printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
1415 ,rowPadSize,colPadSize,timeBinSize);
793ff80c 1416 }
1417
e23fbb27 1418 // Don't analyze test hits and switched off detectors
1419 if ((CheckDetector(plane,chamber,sector)) &&
1420 (((Int_t) q) != 0)) {
dd56b762 1421
e23fbb27 1422 if (detector != detectorOld) {
e153aaf6 1423
e23fbb27 1424 if (fDebug > 1) {
1425 printf("<AliTRDdigitizer::MakeDigits> ");
1426 printf("Get new container. New det = %d, Old det = %d\n"
1427 ,detector,detectorOld);
dd9a6ee3 1428 }
e23fbb27 1429 // Compress the old one if enabled
1430 if ((fCompress) && (detectorOld > -1)) {
1431 if (fDebug > 1) {
1432 printf("<AliTRDdigitizer::MakeDigits> ");
1433 printf("Compress the old container ...");
1434 }
1435 signals->Compress(1,0);
1436 for (iDict = 0; iDict < kNDict; iDict++) {
1437 dictionary[iDict]->Compress(1,0);
c1e4b257 1438 }
e23fbb27 1439 if (fDebug > 1) printf("done\n");
793ff80c 1440 }
e23fbb27 1441 // Get the new container
1442 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
1443 if (signals->GetNtime() == 0) {
1444 // Allocate a new one if not yet existing
1445 if (fDebug > 1) {
1446 printf("<AliTRDdigitizer::MakeDigits> ");
1447 printf("Allocate a new container ... ");
1448 }
1449 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1450 }
1451 else {
e23fbb27 1452 // Expand an existing one
1453 if (fCompress) {
1454 if (fDebug > 1) {
1455 printf("<AliTRDdigitizer::MakeDigits> ");
1456 printf("Expand an existing container ... ");
1457 }
1458 signals->Expand();
1459 }
793ff80c 1460 }
e23fbb27 1461 // The same for the dictionary
1462 for (iDict = 0; iDict < kNDict; iDict++) {
1463 dictionary[iDict] = fDigitsManager->GetDictionary(detector,iDict);
1464 if (dictionary[iDict]->GetNtime() == 0) {
1465 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1466 }
1467 else {
1468 if (fCompress) dictionary[iDict]->Expand();
1469 }
1470 }
1471 if (fDebug > 1) printf("done\n");
1472 detectorOld = detector;
793ff80c 1473 }
1474
e23fbb27 1475 // Rotate the sectors on top of each other
1476 fGeo->Rotate(detector,pos,rot);
1477
1478 // The driftlength. It is negative if the hit is in the
1479 // amplification region.
1480 Float_t driftlength = time0 - rot[0];
1481
1482 // Take also the drift in the amplification region into account
1483 // The drift length is at the moment still the same, regardless of
1484 // the position relativ to the wire. This non-isochronity needs still
1485 // to be implemented.
1486 Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
1487 if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
1488
1489 // Loop over all electrons of this hit
1490 // TR photons produce hits with negative charge
1491 Int_t nEl = ((Int_t) TMath::Abs(q));
1492 for (Int_t iEl = 0; iEl < nEl; iEl++) {
1493
1494 xyz[0] = rot[0];
1495 xyz[1] = rot[1];
1496 xyz[2] = rot[2];
1497
1498 // Electron attachment
1499 if (fElAttachOn) {
1500 if (gRandom->Rndm() < (driftlengthL * elAttachProp))
1501 continue;
1502 }
1503
1504 // Apply the diffusion smearing
1505 if (fDiffusionOn) {
1506 if (!(Diffusion(driftlengthL,xyz))) continue;
1507 }
f7336fa3 1508
e23fbb27 1509 // Apply E x B effects (depends on drift direction)
1510 if (fExBOn) {
1511 if (!(ExB(driftlength+kAmWidth,xyz))) continue;
1512 }
793ff80c 1513
e23fbb27 1514 // The electron position after diffusion and ExB in pad coordinates
1515 // The pad row (z-direction)
1516 Float_t rowDist = xyz[2] - row0;
1517 Int_t rowE = ((Int_t) (rowDist * divideRow));
1518 if ((rowE < 0) || (rowE >= nRowMax)) continue;
1519 Float_t rowOffset = ((((Float_t) rowE) + 0.5) * rowPadSize) - rowDist;
1520
1521 // The pad column (rphi-direction)
1522 Float_t col0tilt = Col0Tilted(col0,rowOffset,plane);
1523 Float_t colDist = xyz[1] - col0tilt;
1524 Int_t colE = ((Int_t) (colDist * divideCol));
1525 if ((colE < 0) || (colE >= nColMax)) continue;
1526 Float_t colOffset = ((((Float_t) colE) + 0.5) * colPadSize) - colDist;
1527
1528 // The time bin (negative for hits in the amplification region)
1529 // In the amplification region the electrons drift from both sides
1530 // to the middle (anode wire plane)
1531 Float_t timeDist = time0 - xyz[0];
1532 Float_t timeOffset = 0;
1533 Int_t timeE = 0;
1534 if (timeDist > 0) {
1535 // The time bin
1536 timeE = ((Int_t) (timeDist * divideTime));
1537 // The distance of the position to the middle of the timebin
1538 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
1539 }
1540 else {
1541 // Difference between half of the amplification gap width and
1542 // the distance to the anode wire
1543 Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
1544 // The time bin
1545 timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
1546 // The distance of the position to the middle of the timebin
1547 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
1548 }
872a7aba 1549
e23fbb27 1550 // Apply the gas gain including fluctuations
1551 Float_t ggRndm = 0.0;
1552 do {
1553 ggRndm = gRandom->Rndm();
1554 } while (ggRndm <= 0);
1555 Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
1556
1557 // Apply the pad response
1558 if (fPRFOn) {
1559 // The distance of the electron to the center of the pad
1560 // in units of pad width
1561 Float_t dist = - colOffset * divideCol;
1562 if (!(PadResponse(signal,dist,plane,padSignal))) continue;
793ff80c 1563 }
e23fbb27 1564 else {
1565 padSignal[0] = 0.0;
1566 padSignal[1] = signal;
1567 padSignal[2] = 0.0;
1568 }
1569
1570 // Sample the time response inside the drift region
1571 // + additional time bins before and after.
1572 // The sampling is done always in the middle of the time bin
1573 for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
1574 ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
1575 ;iTimeBin++) {
1576
1577 // Apply the time response
1578 Float_t timeResponse = 1.0;
1579 Float_t crossTalk = 0.0;
1580 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
1581 if (fTRFOn) {
1582 timeResponse = TimeResponse(time);
1583 }
1584 if (fCTOn) {
1585 crossTalk = CrossTalk(time);
1586 }
1587
1588 signalOld[0] = 0.0;
1589 signalOld[1] = 0.0;
1590 signalOld[2] = 0.0;
f7336fa3 1591
e23fbb27 1592 for (iPad = 0; iPad < kNpad; iPad++) {
1593
1594 Int_t colPos = colE + iPad - 1;
1595 if (colPos < 0) continue;
1596 if (colPos >= nColMax) break;
1597
1598 // Add the signals
1599 // Note: The time bin number is shifted by nTimeBefore to avoid negative
1600 // time bins. This has to be subtracted later.
1601 Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
1602 signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
1603 if( colPos != colE ) {
1604 signalOld[iPad] += padSignal[iPad] * (timeResponse + crossTalk);
1605 }
1606 else {
1607 signalOld[iPad] += padSignal[iPad] * timeResponse;
1608 }
1609 signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
1610
1611 // Store the track index in the dictionary
1612 // Note: We store index+1 in order to allow the array to be compressed
1613 if (signalOld[iPad] > 0) {
1614 for (iDict = 0; iDict < kNDict; iDict++) {
1615 Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
1616 ,colPos
1617 ,iCurrentTimeBin);
1618 if (oldTrack == track+1) break;
1619 if (oldTrack == 0) {
1620 dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
1621 break;
1622 }
71d9fa7b 1623 }
1624 }
872a7aba 1625
e23fbb27 1626 } // Loop: pads
f7336fa3 1627
e23fbb27 1628 } // Loop: time bins
f7336fa3 1629
e23fbb27 1630 } // Loop: electrons of a single hit
f7336fa3 1631
e23fbb27 1632 } // If: detector and test hit
f7336fa3 1633
e23fbb27 1634 hit = (AliTRDhit *) fTRD->NextHit();
f7336fa3 1635
e23fbb27 1636 } // Loop: hits of one primary track
1637
1638 } // Loop: primary tracks
1639
1640 if (fDebug > 0) {
1641 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1642 printf("Finished analyzing %d hits\n",countHits);
1643 }
793ff80c 1644
6244debe 1645 // The total conversion factor
1646 Float_t convert = kEl2fC * fPadCoupling * fTimeCoupling * fChipGain;
1647
793ff80c 1648 // Loop through all chambers to finalize the digits
1649 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1650
872a7aba 1651 Int_t plane = fGeo->GetPlane(iDet);
1652 Int_t sector = fGeo->GetSector(iDet);
1653 Int_t chamber = fGeo->GetChamber(iDet);
1654 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1655 Int_t nColMax = fGeo->GetColMax(plane);
1656 Int_t nTimeMax = fGeo->GetTimeMax();
1657 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 1658
e23fbb27 1659 Double_t *inADC = new Double_t[nTimeTotal];
1660 Double_t *outADC = new Double_t[nTimeTotal];
1661
1662 if (fDebug > 0) {
1663 printf("<AliTRDdigitizer::MakeDigits> ");
793ff80c 1664 printf("Digitization for chamber %d\n",iDet);
1665 }
da581aea 1666
793ff80c 1667 // Add a container for the digits of this detector
abaf1f1d 1668 digits = fDigitsManager->GetDigits(iDet);
793ff80c 1669 // Allocate memory space for the digits buffer
872a7aba 1670 digits->Allocate(nRowMax,nColMax,nTimeTotal);
da581aea 1671
793ff80c 1672 // Get the signal container
1673 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
1674 if (signals->GetNtime() == 0) {
1675 // Create missing containers
872a7aba 1676 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1677 }
1678 else {
1679 // Expand the container if neccessary
1680 if (fCompress) signals->Expand();
1681 }
1682 // Create the missing dictionary containers
1683 for (iDict = 0; iDict < kNDict; iDict++) {
abaf1f1d 1684 dictionary[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
793ff80c 1685 if (dictionary[iDict]->GetNtime() == 0) {
872a7aba 1686 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1687 }
1688 }
f7336fa3 1689
793ff80c 1690 Int_t nDigits = 0;
1691
6244debe 1692 // Don't create noise in detectors that are switched off
1693 if (CheckDetector(plane,chamber,sector)) {
1694
1695 // Create the digits for this chamber
872a7aba 1696 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1697 for (iCol = 0; iCol < nColMax; iCol++ ) {
6244debe 1698
e23fbb27 1699 // Create summable digits
1700 if (fSDigits) {
6244debe 1701
e23fbb27 1702 for (iTime = 0; iTime < nTimeTotal; iTime++) {
872a7aba 1703 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
abaf1f1d 1704 signalAmp *= fSDigitsScale;
e23fbb27 1705 signalAmp = TMath::Min(signalAmp,(Float_t) 1.0e9);
abaf1f1d 1706 Int_t adc = (Int_t) signalAmp;
6244debe 1707 nDigits++;
872a7aba 1708 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
c1e4b257 1709 }
6244debe 1710
e23fbb27 1711 }
1712 // Create normal digits
1713 else {
6244debe 1714
e23fbb27 1715 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1716 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
6244debe 1717 // Add the noise
1718 signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0);
1719 // Convert to mV
1720 signalAmp *= convert;
1721 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
1722 // signal is larger than fADCinRange
1723 Int_t adc = 0;
1724 if (signalAmp >= fADCinRange) {
1725 adc = ((Int_t) fADCoutRange);
1726 }
1727 else {
1728 adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
1729 }
e23fbb27 1730 inADC[iTime] = adc;
1731 outADC[iTime] = adc;
1732 }
6244debe 1733
e23fbb27 1734 // Apply the tail cancelation via the digital filter
1735 if (fTCOn) {
1736 DeConvExp(inADC,outADC,nTimeTotal,fTCnexp);
1737 }
1738
1739 for (iTime = 0; iTime < nTimeTotal; iTime++) {
6244debe 1740 // Store the amplitude of the digit if above threshold
e23fbb27 1741 if (outADC[iTime] > fADCthreshold) {
1742 if (fDebug > 2) {
1743 printf(" iRow = %d, iCol = %d, iTime = %d, adc = %f\n"
1744 ,iRow,iCol,iTime,outADC[iTime]);
6244debe 1745 }
1746 nDigits++;
e23fbb27 1747 digits->SetDataUnchecked(iRow,iCol,iTime,outADC[iTime]);
6244debe 1748 }
6244debe 1749 }
1750
1751 }
e23fbb27 1752
6244debe 1753 }
793ff80c 1754 }
6244debe 1755
793ff80c 1756 }
1757
1758 // Compress the arrays
1759 digits->Compress(1,0);
1760 for (iDict = 0; iDict < kNDict; iDict++) {
1761 dictionary[iDict]->Compress(1,0);
1762 }
f7336fa3 1763
793ff80c 1764 totalSizeDigits += digits->GetSize();
1765 totalSizeDict0 += dictionary[0]->GetSize();
1766 totalSizeDict1 += dictionary[1]->GetSize();
1767 totalSizeDict2 += dictionary[2]->GetSize();
f7336fa3 1768
c1e4b257 1769 Float_t nPixel = nRowMax * nColMax * nTimeMax;
e23fbb27 1770 if (fDebug > 0) {
1771 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1772 printf("Found %d digits in detector %d (%3.0f).\n"
1773 ,nDigits,iDet
1774 ,100.0 * ((Float_t) nDigits) / nPixel);
1775 }
1776
793ff80c 1777 if (fCompress) signals->Compress(1,0);
f7336fa3 1778
e23fbb27 1779 delete [] inADC;
1780 delete [] outADC;
1781
f7336fa3 1782 }
1783
e23fbb27 1784 if (fDebug > 0) {
1785 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1786 printf("Total number of analyzed hits = %d\n",countHits);
e23fbb27 1787 printf("<AliTRDdigitizer::MakeDigits> ");
abaf1f1d 1788 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
1789 ,totalSizeDict0
1790 ,totalSizeDict1
1791 ,totalSizeDict2);
1792 }
1793
1794 return kTRUE;
1795
1796}
1797
1798//_____________________________________________________________________________
1799void AliTRDdigitizer::AddSDigitsManager(AliTRDdigitsManager *man)
1800{
1801 //
1802 // Add a digits manager for s-digits to the input list.
1803 //
1804
1805 fSDigitsManagerList->Add(man);
1806
1807}
1808
1809//_____________________________________________________________________________
b1113c6b 1810void AliTRDdigitizer::DeleteSDigitsManager()
1811{
1812 //
1813 // Removes digits manager from the input list.
1814 //
1815
1816 fSDigitsManagerList->Delete();
1817
1818}
1819
1820//_____________________________________________________________________________
abaf1f1d 1821Bool_t AliTRDdigitizer::ConvertSDigits()
1822{
1823 //
1824 // Converts s-digits to normal digits
1825 //
1826
1827 // Number of track dictionary arrays
1828 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1829
1830 // Converts number of electrons to fC
1831 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
1832
1833 Int_t iDict = 0;
e23fbb27 1834 Int_t iRow;
1835 Int_t iCol;
1836 Int_t iTime;
abaf1f1d 1837
e23fbb27 1838 if (fDebug > 0) {
abaf1f1d 1839 this->Dump();
1840 }
1841
1842 Double_t sDigitsScale = 1.0 / GetSDigitsScale();
1843 Double_t noise = GetNoise();
1844 Double_t padCoupling = GetPadCoupling();
1845 Double_t timeCoupling = GetTimeCoupling();
1846 Double_t chipGain = GetChipGain();
1847 Double_t convert = kEl2fC * padCoupling * timeCoupling * chipGain;;
1848 Double_t adcInRange = GetADCinRange();
1849 Double_t adcOutRange = GetADCoutRange();
1850 Int_t adcThreshold = GetADCthreshold();
1851
1852 AliTRDdataArrayI *digitsIn;
1853 AliTRDdataArrayI *digitsOut;
1854 AliTRDdataArrayI *dictionaryIn[kNDict];
1855 AliTRDdataArrayI *dictionaryOut[kNDict];
1856
1857 // Loop through the detectors
1858 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
da581aea 1859
e23fbb27 1860 if (fDebug > 0) {
1861 printf("<AliTRDdigitizer::ConvertSDigits> ");
abaf1f1d 1862 printf("Convert detector %d to digits.\n",iDet);
1863 }
1864
1865 Int_t plane = fGeo->GetPlane(iDet);
1866 Int_t sector = fGeo->GetSector(iDet);
1867 Int_t chamber = fGeo->GetChamber(iDet);
1868 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1869 Int_t nColMax = fGeo->GetColMax(plane);
1870 Int_t nTimeTotal = fGeo->GetTimeTotal();
1871
e23fbb27 1872 Double_t *inADC = new Double_t[nTimeTotal];
1873 Double_t *outADC = new Double_t[nTimeTotal];
1874
abaf1f1d 1875 digitsIn = fSDigitsManager->GetDigits(iDet);
1876 digitsIn->Expand();
1877 digitsOut = fDigitsManager->GetDigits(iDet);
1878 digitsOut->Allocate(nRowMax,nColMax,nTimeTotal);
1879 for (iDict = 0; iDict < kNDict; iDict++) {
1880 dictionaryIn[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
1881 dictionaryIn[iDict]->Expand();
1882 dictionaryOut[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
1883 dictionaryOut[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1884 }
1885
e23fbb27 1886 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1887 for (iCol = 0; iCol < nColMax; iCol++ ) {
abaf1f1d 1888
e23fbb27 1889 for (iTime = 0; iTime < nTimeTotal; iTime++) {
abaf1f1d 1890 Double_t signal = (Double_t) digitsIn->GetDataUnchecked(iRow,iCol,iTime);
1891 signal *= sDigitsScale;
1892 // Add the noise
1893 signal = TMath::Max((Double_t) gRandom->Gaus(signal,noise),0.0);
1894 // Convert to mV
1895 signal *= convert;
1896 // Convert to ADC counts. Set the overflow-bit adcOutRange if the
1897 // signal is larger than adcInRange
1898 Int_t adc = 0;
1899 if (signal >= adcInRange) {
1900 adc = ((Int_t) adcOutRange);
1901 }
1902 else {
1903 adc = ((Int_t) (signal * (adcOutRange / adcInRange)));
1904 }
e23fbb27 1905 inADC[iTime] = adc;
1906 outADC[iTime] = adc;
1907 }
1908
1909 // Apply the tail cancelation via the digital filter
1910 if (fTCOn) {
1911 DeConvExp(inADC,outADC,nTimeTotal,fTCnexp);
1912 }
1913
1914 for (iTime = 0; iTime < nTimeTotal; iTime++) {
abaf1f1d 1915 // Store the amplitude of the digit if above threshold
e23fbb27 1916 if (outADC[iTime] > adcThreshold) {
1917 digitsOut->SetDataUnchecked(iRow,iCol,iTime,outADC[iTime]);
1918 // Copy the dictionary
1919 for (iDict = 0; iDict < kNDict; iDict++) {
1920 Int_t track = dictionaryIn[iDict]->GetDataUnchecked(iRow,iCol,iTime);
1921 dictionaryOut[iDict]->SetDataUnchecked(iRow,iCol,iTime,track);
1922 }
abaf1f1d 1923 }
abaf1f1d 1924 }
e23fbb27 1925
abaf1f1d 1926 }
1927 }
1928
1929 if (fCompress) {
1930 digitsIn->Compress(1,0);
1931 digitsOut->Compress(1,0);
1932 for (iDict = 0; iDict < kNDict; iDict++) {
1933 dictionaryIn[iDict]->Compress(1,0);
1934 dictionaryOut[iDict]->Compress(1,0);
1935 }
1936 }
1937
e23fbb27 1938 delete [] inADC;
1939 delete [] outADC;
1940
abaf1f1d 1941 }
f7336fa3 1942
1943 return kTRUE;
1944
1945}
1946
1947//_____________________________________________________________________________
abaf1f1d 1948Bool_t AliTRDdigitizer::MergeSDigits()
16bf9884 1949{
1950 //
abaf1f1d 1951 // Merges the input s-digits:
1952 // - The amplitude of the different inputs are summed up.
1953 // - Of the track IDs from the input dictionaries only one is
1954 // kept for each input. This works for maximal 3 different merged inputs.
16bf9884 1955 //
1956
abaf1f1d 1957 // Number of track dictionary arrays
1958 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1959
1960 Int_t iDict = 0;
e23fbb27 1961 Int_t jDict = 0;
abaf1f1d 1962
1963 AliTRDdataArrayI *digitsA;
1964 AliTRDdataArrayI *digitsB;
1965 AliTRDdataArrayI *dictionaryA[kNDict];
1966 AliTRDdataArrayI *dictionaryB[kNDict];
1967
1968 // Get the first s-digits
1969 fSDigitsManager = (AliTRDdigitsManager *) fSDigitsManagerList->First();
1970 if (!fSDigitsManager) return kFALSE;
1971
1972 // Loop through the other sets of s-digits
1973 AliTRDdigitsManager *mergeSDigitsManager;
1974 mergeSDigitsManager = (AliTRDdigitsManager *)
1975 fSDigitsManagerList->After(fSDigitsManager);
1976
e23fbb27 1977 if (fDebug > 0) {
abaf1f1d 1978 if (mergeSDigitsManager) {
e23fbb27 1979 printf("<AliTRDdigitizer::MergeSDigits> ");
1980 printf("Merge %d input files.\n",fSDigitsManagerList->GetSize());
abaf1f1d 1981 }
1982 else {
e23fbb27 1983 printf("<AliTRDdigitizer::MergeSDigits> ");
abaf1f1d 1984 printf("Only one input file.\n");
1985 }
1986 }
1987
1988 Int_t iMerge = 0;
1989 while (mergeSDigitsManager) {
1990
1991 iMerge++;
1992
1993 // Loop through the detectors
1994 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1995
1996 Int_t plane = fGeo->GetPlane(iDet);
1997 Int_t sector = fGeo->GetSector(iDet);
1998 Int_t chamber = fGeo->GetChamber(iDet);
1999 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
2000 Int_t nColMax = fGeo->GetColMax(plane);
2001 Int_t nTimeTotal = fGeo->GetTimeTotal();
2002
2003 // Loop through the pixels of one detector and add the signals
2004 digitsA = fSDigitsManager->GetDigits(iDet);
2005 digitsB = mergeSDigitsManager->GetDigits(iDet);
2006 digitsA->Expand();
2007 digitsB->Expand();
2008 for (iDict = 0; iDict < kNDict; iDict++) {
2009 dictionaryA[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
2010 dictionaryB[iDict] = mergeSDigitsManager->GetDictionary(iDet,iDict);
2011 dictionaryA[iDict]->Expand();
2012 dictionaryB[iDict]->Expand();
2013 }
2014
e23fbb27 2015 if (fDebug > 0) {
2016 printf("<AliTRDdigitizer::MergeSDigits> ");
2017 printf("Merge detector %d of input no.%d\n",iDet,iMerge+1);
abaf1f1d 2018 }
2019
2020 for (Int_t iRow = 0; iRow < nRowMax; iRow++ ) {
2021 for (Int_t iCol = 0; iCol < nColMax; iCol++ ) {
2022 for (Int_t iTime = 0; iTime < nTimeTotal; iTime++) {
2023
2024 // Add the amplitudes of the summable digits
2025 Int_t ampA = digitsA->GetDataUnchecked(iRow,iCol,iTime);
2026 Int_t ampB = digitsB->GetDataUnchecked(iRow,iCol,iTime);
2027 ampA += ampB;
2028 digitsA->SetDataUnchecked(iRow,iCol,iTime,ampA);
2029
e23fbb27 2030 // Add the mask to the track id if defined.
2031 for (iDict = 0; iDict < kNDict; iDict++) {
2032 Int_t trackB = dictionaryB[iDict]->GetDataUnchecked(iRow,iCol,iTime);
2033 if ((fMasks) && (trackB > 0)) {
2034 for (jDict = 0; jDict < kNDict; jDict++) {
2035 Int_t trackA = dictionaryA[iDict]->GetDataUnchecked(iRow,iCol,iTime);
2036 if (trackA == 0) {
2037 trackA = trackB + fMasks[iMerge];
2038 dictionaryA[iDict]->SetDataUnchecked(iRow,iCol,iTime,trackA);
2039 }
2040 }
2041 }
abaf1f1d 2042 }
2043
2044 }
2045 }
2046 }
2047
2048 if (fCompress) {
2049 digitsA->Compress(1,0);
2050 digitsB->Compress(1,0);
2051 for (iDict = 0; iDict < kNDict; iDict++) {
2052 dictionaryA[iDict]->Compress(1,0);
2053 dictionaryB[iDict]->Compress(1,0);
2054 }
2055 }
2056
2057 }
2058
2059 // The next set of s-digits
2060 mergeSDigitsManager = (AliTRDdigitsManager *)
2061 fSDigitsManagerList->After(mergeSDigitsManager);
2062
2063 }
2064
16bf9884 2065 return kTRUE;
2066
2067}
2068
2069//_____________________________________________________________________________
abaf1f1d 2070Bool_t AliTRDdigitizer::SDigits2Digits()
2071{
2072 //
2073 // Merges the input s-digits and converts them to normal digits
2074 //
2075
2076 if (!MergeSDigits()) return kFALSE;
2077
2078 return ConvertSDigits();
2079
2080}
2081
2082//_____________________________________________________________________________
793ff80c 2083Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
2084{
2085 //
2086 // Checks whether a detector is enabled
2087 //
2088
2089 if ((fTRD->GetSensChamber() >= 0) &&
2090 (fTRD->GetSensChamber() != chamber)) return kFALSE;
2091 if ((fTRD->GetSensPlane() >= 0) &&
c1e4b257 2092 (fTRD->GetSensPlane() != plane)) return kFALSE;
793ff80c 2093 if ( fTRD->GetSensSector() >= 0) {
2094 Int_t sens1 = fTRD->GetSensSector();
2095 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
2096 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
2097 * AliTRDgeometry::Nsect();
2098 if (sens1 < sens2) {
2099 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
2100 }
2101 else {
2102 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
2103 }
2104 }
2105
2106 return kTRUE;
2107
2108}
2109
2110//_____________________________________________________________________________
f7336fa3 2111Bool_t AliTRDdigitizer::WriteDigits()
2112{
2113 //
2114 // Writes out the TRD-digits and the dictionaries
2115 //
2116
da581aea 2117 // Store the digits and the dictionary in the tree
abaf1f1d 2118 return fDigitsManager->WriteDigits();
f7336fa3 2119
2120}
793ff80c 2121
2122//_____________________________________________________________________________
e23fbb27 2123void AliTRDdigitizer::SetTiltingAngle(Float_t v)
2124{
2125 //
2126 // Set the tilting angle for the readout pads
2127 //
2128
2129 fTiltingAngle = TMath::Tan(TMath::Pi()/180.0 * v);
2130
2131}
2132
2133//_____________________________________________________________________________
2134Float_t AliTRDdigitizer::GetTiltingAngle() const
2135{
2136 //
2137 // Get the tilting angle for the readout pads
2138 //
2139
2140 return TMath::ATan(180.0/TMath::Pi() * fTiltingAngle);
2141
2142}
2143
2144//_____________________________________________________________________________
db30bf0f 2145Float_t AliTRDdigitizer::GetDiffusionL(Float_t vd, Float_t b)
793ff80c 2146{
2147 //
db30bf0f 2148 // Returns the longitudinal diffusion coefficient for a given drift
2149 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
2150 // The values are according to a GARFIELD simulation.
793ff80c 2151 //
2152
db30bf0f 2153 const Int_t kNb = 5;
2154 Float_t p0[kNb] = { 0.007440, 0.007493, 0.007513, 0.007672, 0.007831 };
2155 Float_t p1[kNb] = { 0.019252, 0.018912, 0.018636, 0.018012, 0.017343 };
2156 Float_t p2[kNb] = { -0.005042, -0.004926, -0.004867, -0.004650, -0.004424 };
2157 Float_t p3[kNb] = { 0.000195, 0.000189, 0.000195, 0.000182, 0.000169 };
2158
2159 Int_t ib = ((Int_t) (10 * (b - 0.15)));
2160 ib = TMath::Max( 0,ib);
2161 ib = TMath::Min(kNb,ib);
2162
2163 Float_t diff = p0[ib]
2164 + p1[ib] * vd
2165 + p2[ib] * vd*vd
2166 + p3[ib] * vd*vd*vd;
2167
2168 return diff;
2169
2170}
2171
2172//_____________________________________________________________________________
2173Float_t AliTRDdigitizer::GetDiffusionT(Float_t vd, Float_t b)
2174{
2175 //
2176 // Returns the transverse diffusion coefficient for a given drift
2177 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
2178 // The values are according to a GARFIELD simulation.
2179 //
2180
2181 const Int_t kNb = 5;
2182 Float_t p0[kNb] = { 0.009550, 0.009599, 0.009674, 0.009757, 0.009850 };
2183 Float_t p1[kNb] = { 0.006667, 0.006539, 0.006359, 0.006153, 0.005925 };
2184 Float_t p2[kNb] = { -0.000853, -0.000798, -0.000721, -0.000635, -0.000541 };
2185 Float_t p3[kNb] = { 0.000131, 0.000122, 0.000111, 0.000098, 0.000085 };
2186
2187 Int_t ib = ((Int_t) (10 * (b - 0.15)));
2188 ib = TMath::Max( 0,ib);
2189 ib = TMath::Min(kNb,ib);
2190
2191 Float_t diff = p0[ib]
2192 + p1[ib] * vd
2193 + p2[ib] * vd*vd
2194 + p3[ib] * vd*vd*vd;
2195
2196 return diff;
2197
2198}
2199
2200//_____________________________________________________________________________
2201Float_t AliTRDdigitizer::GetOmegaTau(Float_t vd, Float_t b)
2202{
2203 //
2204 // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
2205 // and a B-field <b> for Xe/CO2 (15%).
2206 // The values are according to a GARFIELD simulation.
2207 //
2208
2209 const Int_t kNb = 5;
2210 Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
2211 Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
2212 Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
2213 Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
2214
2215 Int_t ib = ((Int_t) (10 * (b - 0.15)));
2216 ib = TMath::Max( 0,ib);
2217 ib = TMath::Min(kNb,ib);
2218
2219 Float_t alphaL = p0[ib]
2220 + p1[ib] * vd
2221 + p2[ib] * vd*vd
2222 + p3[ib] * vd*vd*vd;
2223
2224 return TMath::Tan(alphaL);
793ff80c 2225
2226}
2227
e23fbb27 2228//_____________________________________________________________________________
2229void AliTRDdigitizer::DeConvExp(Double_t *source, Double_t *target
2230 , Int_t n, Int_t nexp)
2231{
2232 //
2233 // Does the deconvolution by the digital filter.
2234 //
2235 // Author: Marcus Gutfleisch, KIP Heidelberg
2236 // Optimized for: New TRF from Venelin Angelov, simulated with CADENCE
2237 // Pad-ground capacitance = 25 pF
2238 // Pad-pad cross talk capacitance = 6 pF
2239 // For 10 MHz digitization, corresponding to 20 time bins
2240 // in the drift region
2241 //
2242
2243 Double_t rates[2];
2244 Double_t coefficients[2];
2245
2246 /* initialize (coefficient = alpha, rates = lambda) */
2247
2248 if( nexp == 1 ) {
2249 rates[0] = 0.466998;
2250 /* no rescaling */
2251 coefficients[0] = 1.0;
2252 }
2253 if( nexp == 2 ) {
2254 rates[0] = 0.8988162;
2255 coefficients[0] = 0.11392069;
2256 rates[1] = 0.3745688;
2257 coefficients[1] = 0.8860793;
2258 /* no rescaling */
2259 Float_t sumc = coefficients[0]+coefficients[1];
2260 coefficients[0] /= sumc;
2261 coefficients[1] /= sumc;
2262 }
2263
2264 Int_t i, k;
2265 Double_t reminder[2];
2266 Double_t correction, result;
2267
2268 /* attention: computation order is important */
2269 correction=0.0;
2270 for ( k = 0; k < nexp; k++ ) reminder[k]=0.0;
2271
2272 for ( i = 0; i < n; i++ ) {
2273 result = ( source[i] - correction ); /* no rescaling */
2274 target[i] = result;
2275
2276 for ( k = 0; k < nexp; k++ ) reminder[k] = rates[k]
2277 * ( reminder[k] + coefficients[k] * result);
2278
2279 correction=0.0;
2280 for ( k = 0; k < nexp; k++ ) correction += reminder[k];
2281 }
2282
2283}
2284