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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$Log$
db30bf0f 18Revision 1.23 2001/05/07 08:04:48 cblume
19New TRF and PRF. Speedup of the code. Digits from amplification region included
20
872a7aba 21Revision 1.22 2001/03/30 14:40:14 cblume
22Update of the digitization parameter
23
a3c76cdc 24Revision 1.21 2001/03/13 09:30:35 cblume
25Update of digitization. Moved digit branch definition to AliTRD
26
6244debe 27Revision 1.20 2001/02/25 20:19:00 hristov
28Minor correction: loop variable declared only once for HP, Sun
29
c3a4830f 30Revision 1.19 2001/02/14 18:22:26 cblume
31Change in the geometry of the padplane
32
71d9fa7b 33Revision 1.18 2001/01/26 19:56:57 hristov
34Major upgrade of AliRoot code
35
2ab0c725 36Revision 1.17 2000/12/08 12:53:27 cblume
37Change in Copy() function for HP-compiler
38
1948ba0c 39Revision 1.16 2000/12/07 12:20:46 cblume
40Go back to array compression. Use sampled PRF to speed up digitization
41
e153aaf6 42Revision 1.15 2000/11/23 14:34:08 cblume
43Fixed bug in expansion routine of arrays (initialize buffers properly)
44
259b9e4b 45Revision 1.14 2000/11/20 08:54:44 cblume
46Switch off compression as default
47
c1e4b257 48Revision 1.13 2000/11/10 14:57:52 cblume
49Changes in the geometry constants for the DEC compiler
50
dd56b762 51Revision 1.12 2000/11/01 14:53:20 cblume
52Merge with TRD-develop
53
793ff80c 54Revision 1.1.4.9 2000/10/26 17:00:22 cblume
55Fixed bug in CheckDetector()
56
57Revision 1.1.4.8 2000/10/23 13:41:35 cblume
58Added protection against Log(0) in the gas gain calulation
59
60Revision 1.1.4.7 2000/10/17 02:27:34 cblume
61Get rid of global constants
62
63Revision 1.1.4.6 2000/10/16 01:16:53 cblume
64Changed timebin 0 to be the one closest to the readout
65
66Revision 1.1.4.5 2000/10/15 23:34:29 cblume
67Faster version of the digitizer
68
69Revision 1.1.4.4 2000/10/06 16:49:46 cblume
70Made Getters const
71
72Revision 1.1.4.3 2000/10/04 16:34:58 cblume
73Replace include files by forward declarations
74
75Revision 1.1.4.2 2000/09/22 14:41:10 cblume
76Bug fix in PRF. Included time response. New structure
77
eda4336d 78Revision 1.10 2000/10/05 07:27:53 cblume
79Changes in the header-files by FCA
80
6798b56e 81Revision 1.9 2000/10/02 21:28:19 fca
82Removal of useless dependecies via forward declarations
83
94de3818 84Revision 1.8 2000/06/09 11:10:07 cblume
85Compiler warnings and coding conventions, next round
86
dd9a6ee3 87Revision 1.7 2000/06/08 18:32:58 cblume
88Make code compliant to coding conventions
89
8230f242 90Revision 1.6 2000/06/07 16:27:32 cblume
91Try to remove compiler warnings on Sun and HP
92
9d0b222b 93Revision 1.5 2000/05/09 16:38:57 cblume
94Removed PadResponse(). Merge problem
95
f0a7bf65 96Revision 1.4 2000/05/08 15:53:45 cblume
97Resolved merge conflict
98
da581aea 99Revision 1.3 2000/04/28 14:49:27 cblume
100Only one declaration of iDict in MakeDigits()
101
102Revision 1.1.4.1 2000/05/08 14:42:04 cblume
103Introduced AliTRDdigitsManager
28329a48 104
1befd3b2 105Revision 1.1 2000/02/28 19:00:13 cblume
106Add new TRD classes
107
f7336fa3 108*/
109
110///////////////////////////////////////////////////////////////////////////////
111// //
112// Creates and handles digits from TRD hits //
113// //
114// The following effects are included: //
115// - Diffusion //
116// - ExB effects //
117// - Gas gain including fluctuations //
118// - Pad-response (simple Gaussian approximation) //
119// - Electronics noise //
120// - Electronics gain //
121// - Digitization //
122// - ADC threshold //
123// The corresponding parameter can be adjusted via the various //
124// Set-functions. If these parameters are not explicitly set, default //
125// values are used (see Init-function). //
126// To produce digits from a root-file with TRD-hits use the //
127// slowDigitsCreate.C macro. //
128// //
129///////////////////////////////////////////////////////////////////////////////
130
6798b56e 131#include <stdlib.h>
132
f7336fa3 133#include <TMath.h>
134#include <TVector.h>
135#include <TRandom.h>
94de3818 136#include <TROOT.h>
137#include <TTree.h>
793ff80c 138#include <TFile.h>
139#include <TF1.h>
140
141#include "AliRun.h"
db30bf0f 142#include "AliMagF.h"
f7336fa3 143
144#include "AliTRD.h"
793ff80c 145#include "AliTRDhit.h"
f7336fa3 146#include "AliTRDdigitizer.h"
da581aea 147#include "AliTRDdataArrayI.h"
148#include "AliTRDdataArrayF.h"
793ff80c 149#include "AliTRDsegmentArray.h"
da581aea 150#include "AliTRDdigitsManager.h"
793ff80c 151#include "AliTRDgeometry.h"
f7336fa3 152
153ClassImp(AliTRDdigitizer)
154
155//_____________________________________________________________________________
156AliTRDdigitizer::AliTRDdigitizer():TNamed()
157{
158 //
159 // AliTRDdigitizer default constructor
160 //
161
6244debe 162 fInputFile = NULL;
163 fDigits = NULL;
164 fTRD = NULL;
165 fGeo = NULL;
6244debe 166 fPRFsmp = NULL;
872a7aba 167 fTRFsmp = NULL;
6244debe 168
169 fEvent = 0;
170 fGasGain = 0.0;
171 fNoise = 0.0;
172 fChipGain = 0.0;
173 fSinRange = 0.0;
174 fSoutRange = 0.0;
175 fADCoutRange = 0.0;
176 fADCinRange = 0.0;
177 fADCthreshold = 0;
178 fDiffusionOn = 0;
179 fDiffusionT = 0.0;
180 fDiffusionL = 0.0;
181 fElAttachOn = 0;
182 fElAttachProp = 0.0;
183 fExBOn = 0;
184 fOmegaTau = 0.0;
185 fPRFOn = 0;
186 fTRFOn = 0;
187 fDriftVelocity = 0.0;
188 fPadCoupling = 0.0;
189 fTimeCoupling = 0.0;
190 fTimeBinWidth = 0.0;
db30bf0f 191 fField = 0.0;
6244debe 192
193 fPRFbin = 0;
194 fPRFlo = 0.0;
195 fPRFhi = 0.0;
196 fPRFwid = 0.0;
197 fPRFpad = 0;
198 fTRFbin = 0;
199 fTRFlo = 0.0;
200 fTRFhi = 0.0;
201 fTRFwid = 0.0;
202
203 fCompress = kTRUE;
204 fVerbose = 1;
205 fSDigits = kFALSE;
f7336fa3 206
207}
208
209//_____________________________________________________________________________
210AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
211 :TNamed(name,title)
212{
213 //
214 // AliTRDdigitizer default constructor
215 //
216
da581aea 217 fInputFile = NULL;
218 fDigits = NULL;
219 fTRD = NULL;
220 fGeo = NULL;
e153aaf6 221 fPRFsmp = NULL;
872a7aba 222 fTRFsmp = NULL;
f7336fa3 223
da581aea 224 fEvent = 0;
f7336fa3 225
e153aaf6 226 fCompress = kTRUE;
793ff80c 227 fVerbose = 1;
6244debe 228 fSDigits = kFALSE;
793ff80c 229
f7336fa3 230 Init();
231
232}
233
8230f242 234//_____________________________________________________________________________
dd9a6ee3 235AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
8230f242 236{
237 //
238 // AliTRDdigitizer copy constructor
239 //
240
dd9a6ee3 241 ((AliTRDdigitizer &) d).Copy(*this);
8230f242 242
243}
244
f7336fa3 245//_____________________________________________________________________________
246AliTRDdigitizer::~AliTRDdigitizer()
247{
8230f242 248 //
249 // AliTRDdigitizer destructor
250 //
f7336fa3 251
252 if (fInputFile) {
253 fInputFile->Close();
254 delete fInputFile;
255 }
256
da581aea 257 if (fDigits) {
258 delete fDigits;
f7336fa3 259 }
260
f7336fa3 261}
262
8230f242 263//_____________________________________________________________________________
dd9a6ee3 264AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
265{
266 //
267 // Assignment operator
268 //
269
270 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
271 return *this;
272
273}
274
275//_____________________________________________________________________________
276void AliTRDdigitizer::Copy(TObject &d)
8230f242 277{
278 //
279 // Copy function
280 //
281
1948ba0c 282 Int_t iBin;
283
6244debe 284 ((AliTRDdigitizer &) d).fInputFile = NULL;
285 ((AliTRDdigitizer &) d).fDigits = NULL;
286 ((AliTRDdigitizer &) d).fTRD = NULL;
287 ((AliTRDdigitizer &) d).fGeo = NULL;
288
289 ((AliTRDdigitizer &) d).fEvent = 0;
290
291 ((AliTRDdigitizer &) d).fGasGain = fGasGain;
292 ((AliTRDdigitizer &) d).fNoise = fNoise;
293 ((AliTRDdigitizer &) d).fChipGain = fChipGain;
294 ((AliTRDdigitizer &) d).fSoutRange = fSoutRange;
295 ((AliTRDdigitizer &) d).fSinRange = fSinRange;
296 ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
297 ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
298 ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
299 ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
300 ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
301 ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
302 ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
303 ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
304 ((AliTRDdigitizer &) d).fExBOn = fExBOn;
305 ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
306 ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
307 ((AliTRDdigitizer &) d).fDriftVelocity = fDriftVelocity;
308 ((AliTRDdigitizer &) d).fPadCoupling = fPadCoupling;
309 ((AliTRDdigitizer &) d).fTimeCoupling = fTimeCoupling;
310 ((AliTRDdigitizer &) d).fTimeBinWidth = fTimeBinWidth;
db30bf0f 311 ((AliTRDdigitizer &) d).fField = fField;
6244debe 312 ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
313 ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
314
315 ((AliTRDdigitizer &) d).fCompress = fCompress;
316 ((AliTRDdigitizer &) d).fVerbose = fVerbose;
317 ((AliTRDdigitizer &) d).fSDigits = fSDigits;
dd9a6ee3 318
6244debe 319 ((AliTRDdigitizer &) d).fPRFbin = fPRFbin;
320 ((AliTRDdigitizer &) d).fPRFlo = fPRFlo;
321 ((AliTRDdigitizer &) d).fPRFhi = fPRFhi;
322 ((AliTRDdigitizer &) d).fPRFwid = fPRFwid;
323 ((AliTRDdigitizer &) d).fPRFpad = fPRFpad;
e153aaf6 324 if (((AliTRDdigitizer &) d).fPRFsmp) delete ((AliTRDdigitizer &) d).fPRFsmp;
325 ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin];
1948ba0c 326 for (iBin = 0; iBin < fPRFbin; iBin++) {
e153aaf6 327 ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin];
328 }
6244debe 329 ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
330 ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
331 ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
332 ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
872a7aba 333 if (((AliTRDdigitizer &) d).fTRFsmp) delete ((AliTRDdigitizer &) d).fTRFsmp;
334 ((AliTRDdigitizer &) d).fTRFsmp = new Float_t[fTRFbin];
1948ba0c 335 for (iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 336 ((AliTRDdigitizer &) d).fTRFsmp[iBin] = fTRFsmp[iBin];
6244debe 337 }
338
8230f242 339}
340
f7336fa3 341//_____________________________________________________________________________
342Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz)
343{
344 //
345 // Applies the diffusion smearing to the position of a single electron
346 //
347
348 Float_t driftSqrt = TMath::Sqrt(driftlength);
349 Float_t sigmaT = driftSqrt * fDiffusionT;
350 Float_t sigmaL = driftSqrt * fDiffusionL;
351 xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
352 xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
353 xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
793ff80c 354
f7336fa3 355 return 1;
356
357}
358
359//_____________________________________________________________________________
360Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz)
361{
362 //
363 // Applies E x B effects to the position of a single electron
364 //
365
366 xyz[0] = xyz[0];
793ff80c 367 xyz[1] = xyz[1] + fOmegaTau * driftlength;
f7336fa3 368 xyz[2] = xyz[2];
369
370 return 1;
371
372}
373
793ff80c 374//_____________________________________________________________________________
375Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad)
376{
377 //
378 // Applies the pad response
379 //
380
e153aaf6 381 Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid));
382
383 Int_t iBin0 = iBin - fPRFpad;
384 Int_t iBin1 = iBin;
385 Int_t iBin2 = iBin + fPRFpad;
386
387 if ((iBin0 >= 0) && (iBin2 < fPRFbin)) {
388
389 pad[0] = signal * fPRFsmp[iBin0];
390 pad[1] = signal * fPRFsmp[iBin1];
391 pad[2] = signal * fPRFsmp[iBin2];
392
793ff80c 393 return 1;
e153aaf6 394
793ff80c 395 }
396 else {
e153aaf6 397
793ff80c 398 return 0;
e153aaf6 399
793ff80c 400 }
401
402}
403
404//_____________________________________________________________________________
405Float_t AliTRDdigitizer::TimeResponse(Float_t time)
406{
407 //
408 // Applies the preamp shaper time response
409 //
410
411 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
412 if ((iBin >= 0) && (iBin < fTRFbin)) {
872a7aba 413 return fTRFsmp[iBin];
793ff80c 414 }
415 else {
416 return 0.0;
417 }
418
419}
420
f7336fa3 421//_____________________________________________________________________________
422void AliTRDdigitizer::Init()
423{
424 //
425 // Initializes the digitization procedure with standard values
426 //
427
428 // The default parameter for the digitization
db30bf0f 429 fGasGain = 2800.;
430 fChipGain = 6.1;
6244debe 431 fNoise = 1000.;
432 fADCoutRange = 1023.; // 10-bit ADC
a3c76cdc 433 fADCinRange = 1000.; // 1V input range
6244debe 434 fADCthreshold = 1;
435
436 // For the summable digits
437 fSinRange = 1000000.;
438 fSoutRange = 1000000.;
f7336fa3 439
db30bf0f 440 // The drift velocity (cm / mus)
441 fDriftVelocity = 1.5;
442
443 // The magnetic field strength in Tesla
444 fField = 0.2 * gAlice->Field()->Factor();
445
446 // Diffusion on
6244debe 447 fDiffusionOn = 1;
db30bf0f 448
449 // E x B effects
450 fExBOn = 0;
f7336fa3 451
452 // Propability for electron attachment
6244debe 453 fElAttachOn = 0;
454 fElAttachProp = 0.0;
f7336fa3 455
da581aea 456 // The pad response function
6244debe 457 fPRFOn = 1;
872a7aba 458
459 // The time response function
460 fTRFOn = 1;
da581aea 461
6244debe 462 // The pad coupling factor (same number as for the TPC)
463 fPadCoupling = 0.5;
464
465 // The time coupling factor (same number as for the TPC)
466 fTimeCoupling = 0.4;
467
6244debe 468}
469
470//_____________________________________________________________________________
471void AliTRDdigitizer::ReInit()
472{
473 //
872a7aba 474 // Reinitializes the digitization procedure after a change in the parameter
6244debe 475 //
476
872a7aba 477 if (!fGeo) {
478 printf("AliTRDdigitizer::ReInit -- ");
479 printf("No geometry defined. Run InitDetector() first\n");
480 exit(1);
481 }
482
6244debe 483 // Calculate the time bin width in ns
484 fTimeBinWidth = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
485
872a7aba 486 // The range and the binwidth for the sampled TRF
487 fTRFbin = 100;
db30bf0f 488 // Start 0.2 mus before the signal
489 fTRFlo = -0.2 * fDriftVelocity;
872a7aba 490 // End the maximum driftlength after the signal
491 fTRFhi = AliTRDgeometry::DrThick()
492 + fGeo->GetTimeAfter() * fGeo->GetTimeBinSize();
493 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
6244debe 494
db30bf0f 495 // Transverse and longitudinal diffusion coefficients (Xe/CO2)
496 fDiffusionT = GetDiffusionT(fDriftVelocity,fField);
497 fDiffusionL = GetDiffusionL(fDriftVelocity,fField);
498
499 // omega * tau.= tan(Lorentz-angle)
500 fOmegaTau = GetOmegaTau(fDriftVelocity,fField);
501
6244debe 502 // The Lorentz factor
503 if (fExBOn) {
504 fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
505 }
506 else {
507 fLorentzFactor = 1.0;
508 }
793ff80c 509
510}
511
512//_____________________________________________________________________________
6244debe 513void AliTRDdigitizer::SampleTRF()
793ff80c 514{
515 //
6244debe 516 // Samples the time response function
872a7aba 517 // It is defined according to Vasiles simulation of the preamp shaper
518 // output and includes the effect of the ion tail (based on Tariqs
519 // Garfield simulation) and a shaping time of 125 ns FWHM
793ff80c 520 //
521
872a7aba 522 Int_t ipos1;
523 Int_t ipos2;
524 Float_t diff;
525
db30bf0f 526 const Int_t kNpasa = 200;
527 Float_t time[kNpasa] = { -0.280000, -0.270000, -0.260000, -0.250000
528 , -0.240000, -0.230000, -0.220000, -0.210000
529 , -0.200000, -0.190000, -0.180000, -0.170000
530 , -0.160000, -0.150000, -0.140000, -0.130000
531 , -0.120000, -0.110000, -0.100000, -0.090000
532 , -0.080000, -0.070000, -0.060000, -0.050000
533 , -0.040000, -0.030000, -0.020000, -0.010000
534 , -0.000000, 0.010000, 0.020000, 0.030000
535 , 0.040000, 0.050000, 0.060000, 0.070000
536 , 0.080000, 0.090000, 0.100000, 0.110000
537 , 0.120000, 0.130000, 0.140000, 0.150000
538 , 0.160000, 0.170000, 0.180000, 0.190000
539 , 0.200000, 0.210000, 0.220000, 0.230000
540 , 0.240000, 0.250000, 0.260000, 0.270000
541 , 0.280000, 0.290000, 0.300000, 0.310000
542 , 0.320000, 0.330000, 0.340000, 0.350000
543 , 0.360000, 0.370000, 0.380000, 0.390000
544 , 0.400000, 0.410000, 0.420000, 0.430000
545 , 0.440000, 0.450000, 0.460000, 0.470000
546 , 0.480000, 0.490000, 0.500000, 0.510000
547 , 0.520000, 0.530000, 0.540000, 0.550000
548 , 0.560000, 0.570000, 0.580000, 0.590000
549 , 0.600000, 0.610000, 0.620000, 0.630000
550 , 0.640000, 0.650000, 0.660000, 0.670000
551 , 0.680000, 0.690000, 0.700000, 0.710000
552 , 0.720000, 0.730000, 0.740000, 0.750000
553 , 0.760000, 0.770000, 0.780000, 0.790000
554 , 0.800000, 0.810000, 0.820000, 0.830000
555 , 0.840000, 0.850000, 0.860000, 0.870000
556 , 0.880000, 0.890000, 0.900000, 0.910000
557 , 0.920000, 0.930000, 0.940000, 0.950000
558 , 0.960000, 0.970000, 0.980000, 0.990000
559 , 1.000000, 1.010000, 1.020000, 1.030000
560 , 1.040000, 1.050000, 1.060000, 1.070000
561 , 1.080000, 1.090000, 1.100000, 1.110000
562 , 1.120000, 1.130000, 1.140000, 1.150000
563 , 1.160000, 1.170000, 1.180000, 1.190000
564 , 1.200000, 1.210000, 1.220000, 1.230000
565 , 1.240000, 1.250000, 1.260000, 1.270000
566 , 1.280000, 1.290000, 1.300000, 1.310000
567 , 1.320000, 1.330000, 1.340000, 1.350000
568 , 1.360000, 1.370000, 1.380000, 1.390000
569 , 1.400000, 1.410000, 1.420000, 1.430000
570 , 1.440000, 1.450000, 1.460000, 1.470000
571 , 1.480000, 1.490000, 1.500000, 1.510000
572 , 1.520000, 1.530000, 1.540000, 1.550000
573 , 1.560000, 1.570000, 1.580000, 1.590000
574 , 1.600000, 1.610000, 1.620000, 1.630000
575 , 1.640000, 1.650000, 1.660000, 1.670000
576 , 1.680000, 1.690000, 1.700000, 1.710000 };
577
578 Float_t signal[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
579 , 0.000000, 0.000000, 0.000000, 0.000000
580 , 0.000000, 0.000000, 0.000000, 0.000000
581 , 0.000000, 0.000000, 0.000000, 0.000098
582 , 0.003071, 0.020056, 0.066053, 0.148346
583 , 0.263120, 0.398496, 0.540226, 0.674436
584 , 0.790977, 0.883083, 0.947744, 0.985714
585 , 0.999248, 0.992105, 0.967669, 0.930827
586 , 0.884586, 0.833083, 0.778571, 0.723684
587 , 0.669173, 0.617293, 0.567669, 0.521805
588 , 0.479699, 0.440977, 0.405639, 0.373985
589 , 0.345526, 0.320038, 0.297256, 0.276917
590 , 0.258797, 0.242632, 0.228195, 0.215301
591 , 0.203759, 0.193383, 0.184023, 0.175564
592 , 0.167895, 0.160940, 0.154549, 0.148722
593 , 0.143308, 0.138346, 0.133722, 0.129398
594 , 0.125376, 0.121617, 0.118045, 0.114699
595 , 0.111541, 0.108571, 0.105714, 0.103008
596 , 0.100414, 0.097970, 0.095602, 0.093346
597 , 0.091165, 0.089060, 0.087068, 0.085150
598 , 0.083308, 0.081541, 0.079812, 0.078158
599 , 0.076541, 0.075000, 0.073496, 0.072068
600 , 0.070677, 0.069286, 0.068008, 0.066729
601 , 0.065489, 0.064286, 0.063120, 0.061992
602 , 0.060902, 0.059850, 0.058797, 0.057820
603 , 0.056842, 0.055902, 0.054962, 0.054060
604 , 0.053158, 0.052293, 0.051466, 0.050639
605 , 0.049850, 0.049060, 0.048308, 0.047556
606 , 0.046842, 0.046128, 0.045451, 0.044774
607 , 0.044098, 0.043459, 0.042820, 0.042218
608 , 0.041617, 0.041015, 0.040451, 0.039887
609 , 0.039323, 0.038797, 0.038271, 0.037744
610 , 0.037237, 0.036744, 0.036259, 0.035786
611 , 0.035323, 0.034872, 0.034429, 0.033996
612 , 0.033575, 0.033162, 0.032756, 0.032361
613 , 0.031974, 0.031594, 0.031222, 0.030857
614 , 0.030496, 0.030143, 0.029793, 0.029451
615 , 0.029109, 0.028774, 0.028444, 0.028113
616 , 0.027793, 0.027477, 0.027165, 0.026861
617 , 0.026564, 0.026271, 0.025981, 0.025699
618 , 0.025421, 0.025147, 0.024880, 0.024613
619 , 0.024353, 0.024094, 0.023842, 0.023590
620 , 0.023346, 0.023102, 0.022865, 0.022628
621 , 0.022398, 0.022173, 0.021951, 0.021733
622 , 0.021519, 0.021308, 0.021098, 0.020891
623 , 0.020688, 0.020485, 0.020286, 0.020090
624 , 0.019895, 0.019707, 0.019519, 0.019335
625 , 0.019150, 0.018974, 0.018797, 0.018624
626 , 0.018451, 0.018282, 0.018113, 0.017947
627 , 0.017782, 0.017617, 0.017455, 0.017297 };
628
629 //for (Int_t ipasa = 0; ipasa < kNpasa; ipasa++) {
630 // time[ipasa] += 0.13;
631 //}
872a7aba 632
633 if (fTRFsmp) delete fTRFsmp;
634 fTRFsmp = new Float_t[fTRFbin];
635
636 Float_t loTRF = TMath::Max(fTRFlo / fDriftVelocity,time[0]);
637 Float_t hiTRF = TMath::Min(fTRFhi / fDriftVelocity,time[kNpasa-1]);
793ff80c 638 Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
872a7aba 639
640 // Take the linear interpolation
793ff80c 641 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 642
6244debe 643 Float_t bin = (((Float_t) iBin) + 0.5) * binWidth + loTRF;
872a7aba 644 ipos1 = ipos2 = 0;
645 diff = 0;
646 do {
647 diff = bin - time[ipos2++];
648 } while (diff > 0);
649 ipos2--;
650 if (ipos2 > kNpasa) ipos2 = kNpasa - 1;
651 ipos1 = ipos2 - 1;
652
653 fTRFsmp[iBin] = signal[ipos2]
654 + diff * (signal[ipos2] - signal[ipos1])
655 / ( time[ipos2] - time[ipos1]);
656
793ff80c 657 }
658
f7336fa3 659}
660
e153aaf6 661//_____________________________________________________________________________
662void AliTRDdigitizer::SamplePRF()
663{
664 //
665 // Samples the pad response function
666 //
667
db30bf0f 668 const Int_t kPRFbin = 61;
669 Float_t prf[kPRFbin] = { 0.002340, 0.003380, 0.004900, 0.007080, 0.010220
670 , 0.014740, 0.021160, 0.030230, 0.042800, 0.059830
671 , 0.082030, 0.109700, 0.142550, 0.179840, 0.220610
672 , 0.263980, 0.309180, 0.355610, 0.402790, 0.450350
673 , 0.497930, 0.545190, 0.591740, 0.637100, 0.680610
674 , 0.721430, 0.758400, 0.790090, 0.814720, 0.830480
675 , 0.835930, 0.830480, 0.814710, 0.790070, 0.758390
676 , 0.721410, 0.680590, 0.637080, 0.591730, 0.545180
677 , 0.497920, 0.450340, 0.402790, 0.355610, 0.309190
678 , 0.263990, 0.220630, 0.179850, 0.142570, 0.109720
679 , 0.082040, 0.059830, 0.042820, 0.030230, 0.021170
680 , 0.014740, 0.010230, 0.007080, 0.004900, 0.003380
681 , 0.002340 };
682
683 fPRFlo = -1.5;
684 fPRFhi = 1.5;
685 fPRFbin = kPRFbin;
686 fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin);
687 fPRFpad = ((Int_t) (1.0 / fPRFwid));
688
e153aaf6 689 if (fPRFsmp) delete fPRFsmp;
690 fPRFsmp = new Float_t[fPRFbin];
691 for (Int_t iBin = 0; iBin < fPRFbin; iBin++) {
db30bf0f 692 fPRFsmp[iBin] = prf[iBin];
e153aaf6 693 }
694
695}
696
f7336fa3 697//_____________________________________________________________________________
698Bool_t AliTRDdigitizer::Open(const Char_t *name, Int_t nEvent)
699{
700 //
701 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
702 //
703
704 // Connect the AliRoot file containing Geometry, Kine, and Hits
705 fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(name);
706 if (!fInputFile) {
707 printf("AliTRDdigitizer::Open -- ");
708 printf("Open the ALIROOT-file %s.\n",name);
709 fInputFile = new TFile(name,"UPDATE");
710 }
711 else {
712 printf("AliTRDdigitizer::Open -- ");
713 printf("%s is already open.\n",name);
714 }
715
da581aea 716 gAlice = (AliRun*) fInputFile->Get("gAlice");
717 if (gAlice) {
718 printf("AliTRDdigitizer::Open -- ");
719 printf("AliRun object found on file.\n");
720 }
721 else {
722 printf("AliTRDdigitizer::Open -- ");
723 printf("Could not find AliRun object.\n");
724 return kFALSE;
725 }
f7336fa3 726
727 fEvent = nEvent;
728
729 // Import the Trees for the event nEvent in the file
730 Int_t nparticles = gAlice->GetEvent(fEvent);
731 if (nparticles <= 0) {
732 printf("AliTRDdigitizer::Open -- ");
733 printf("No entries in the trees for event %d.\n",fEvent);
734 return kFALSE;
735 }
736
793ff80c 737 return InitDetector();
738
739}
740
741//_____________________________________________________________________________
742Bool_t AliTRDdigitizer::InitDetector()
743{
744 //
745 // Sets the pointer to the TRD detector and the geometry
746 //
747
dd9a6ee3 748 // Get the pointer to the detector class and check for version 1
749 fTRD = (AliTRD*) gAlice->GetDetector("TRD");
750 if (fTRD->IsVersion() != 1) {
6244debe 751 printf("AliTRDdigitizer::InitDetector -- ");
dd9a6ee3 752 printf("TRD must be version 1 (slow simulator).\n");
753 exit(1);
754 }
755
756 // Get the geometry
757 fGeo = fTRD->GetGeometry();
6244debe 758 printf("AliTRDdigitizer::InitDetector -- ");
dd9a6ee3 759 printf("Geometry version %d\n",fGeo->IsVersion());
760
872a7aba 761 ReInit();
762
f7336fa3 763 return kTRUE;
764
765}
766
6244debe 767//_____________________________________________________________________________
768Bool_t AliTRDdigitizer::SumSDigits()
769{
770 //
771 // Sums up the summable digits and creates final digits
772 // Not yet implemented
773 //
774
775 return kFALSE;
776
777}
778
f7336fa3 779//_____________________________________________________________________________
780Bool_t AliTRDdigitizer::MakeDigits()
781{
782 //
872a7aba 783 // Creates digits.
f7336fa3 784 //
785
f7336fa3 786 ///////////////////////////////////////////////////////////////
787 // Parameter
788 ///////////////////////////////////////////////////////////////
789
790 // Converts number of electrons to fC
872a7aba 791 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
f7336fa3 792
793 ///////////////////////////////////////////////////////////////
794
793ff80c 795 // Number of pads included in the pad response
796 const Int_t kNpad = 3;
797
798 // Number of track dictionary arrays
dd56b762 799 const Int_t kNDict = AliTRDdigitsManager::kNDict;
793ff80c 800
872a7aba 801 // Half the width of the amplification region
802 const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
803
c3a4830f 804 Int_t iRow, iCol, iTime, iPad;
71d9fa7b 805 Int_t iDict = 0;
793ff80c 806 Int_t nBytes = 0;
f7336fa3 807
808 Int_t totalSizeDigits = 0;
809 Int_t totalSizeDict0 = 0;
810 Int_t totalSizeDict1 = 0;
811 Int_t totalSizeDict2 = 0;
812
872a7aba 813 Int_t timeTRDbeg = 0;
814 Int_t timeTRDend = 1;
815
816 Float_t pos[3];
817 Float_t rot[3];
818 Float_t xyz[3];
819 Float_t padSignal[kNpad];
820 Float_t signalOld[kNpad];
821
793ff80c 822 AliTRDdataArrayF *signals = 0;
823 AliTRDdataArrayI *digits = 0;
8230f242 824 AliTRDdataArrayI *dictionary[kNDict];
da581aea 825
793ff80c 826 // Create a digits manager
827 fDigits = new AliTRDdigitsManager();
828
829 // Create a container for the amplitudes
830 AliTRDsegmentArray *signalsArray
831 = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet());
832
872a7aba 833 if (fTRFOn) {
834 timeTRDbeg = ((Int_t) (-fTRFlo / fGeo->GetTimeBinSize())) - 1;
835 timeTRDend = ((Int_t) ( fTRFhi / fGeo->GetTimeBinSize())) - 1;
da581aea 836 printf("AliTRDdigitizer::MakeDigits -- ");
872a7aba 837 printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
da581aea 838 }
839
872a7aba 840 Float_t elAttachProp = fElAttachProp / 100.;
f7336fa3 841
e153aaf6 842 // Create the sampled PRF
843 SamplePRF();
844
6244debe 845 // Create the sampled TRF
846 SampleTRF();
793ff80c 847
872a7aba 848 if (!fGeo) {
849 printf("AliTRDdigitizer::MakeDigits -- ");
850 printf("No geometry defined\n");
851 return kFALSE;
852 }
853
854 printf("AliTRDdigitizer::MakeDigits -- ");
855 printf("Start creating digits.\n");
856 if (fVerbose > 0) this->Dump();
857
793ff80c 858 // Get the pointer to the hit tree
859 TTree *HitTree = gAlice->TreeH();
860
861 // Get the number of entries in the hit tree
862 // (Number of primary particles creating a hit somewhere)
863 Int_t nTrack = (Int_t) HitTree->GetEntries();
864 if (fVerbose > 0) {
865 printf("AliTRDdigitizer::MakeDigits -- ");
866 printf("Found %d primary particles\n",nTrack);
867 }
868
869 Int_t detectorOld = -1;
870 Int_t countHits = 0;
871
872 // Loop through all entries in the tree
873 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
874
875 gAlice->ResetHits();
876 nBytes += HitTree->GetEvent(iTrack);
877
878 // Get the number of hits in the TRD created by this particle
879 Int_t nHit = fTRD->Hits()->GetEntriesFast();
880 if (fVerbose > 0) {
881 printf("AliTRDdigitizer::MakeDigits -- ");
882 printf("Found %d hits for primary particle %d\n",nHit,iTrack);
883 }
884
885 // Loop through the TRD hits
886 for (Int_t iHit = 0; iHit < nHit; iHit++) {
887
888 countHits++;
889
890 AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
793ff80c 891 pos[0] = hit->X();
892 pos[1] = hit->Y();
893 pos[2] = hit->Z();
894 Float_t q = hit->GetCharge();
895 Int_t track = hit->Track();
896 Int_t detector = hit->GetDetector();
897 Int_t plane = fGeo->GetPlane(detector);
898 Int_t sector = fGeo->GetSector(detector);
899 Int_t chamber = fGeo->GetChamber(detector);
900
901 if (!(CheckDetector(plane,chamber,sector))) continue;
902
903 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
904 Int_t nColMax = fGeo->GetColMax(plane);
905 Int_t nTimeMax = fGeo->GetTimeMax();
872a7aba 906 Int_t nTimeBefore = fGeo->GetTimeBefore();
907 Int_t nTimeAfter = fGeo->GetTimeAfter();
908 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 909 Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
910 Float_t col0 = fGeo->GetCol0(plane);
911 Float_t time0 = fGeo->GetTime0(plane);
71d9fa7b 912 Float_t rowPadSize = fGeo->GetRowPadSize(plane,chamber,sector);
913 Float_t colPadSize = fGeo->GetColPadSize(plane);
793ff80c 914 Float_t timeBinSize = fGeo->GetTimeBinSize();
872a7aba 915 Float_t divideRow = 1.0 / rowPadSize;
916 Float_t divideCol = 1.0 / colPadSize;
917 Float_t divideTime = 1.0 / timeBinSize;
793ff80c 918
919 if (fVerbose > 1) {
920 printf("Analyze hit no. %d ",iHit);
921 printf("-----------------------------------------------------------\n");
922 hit->Dump();
923 printf("plane = %d, sector = %d, chamber = %d\n"
924 ,plane,sector,chamber);
925 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
926 ,nRowMax,nColMax,nTimeMax);
872a7aba 927 printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
928 ,nTimeBefore,nTimeAfter,nTimeTotal);
793ff80c 929 printf("row0 = %f, col0 = %f, time0 = %f\n"
930 ,row0,col0,time0);
c1e4b257 931 printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
932 ,rowPadSize,colPadSize,timeBinSize);
793ff80c 933 }
934
872a7aba 935 // Don't analyze test hits
936 if (hit->FromTest()) continue;
dd56b762 937
793ff80c 938 if (detector != detectorOld) {
e153aaf6 939
793ff80c 940 if (fVerbose > 1) {
941 printf("AliTRDdigitizer::MakeDigits -- ");
942 printf("Get new container. New det = %d, Old det = %d\n"
943 ,detector,detectorOld);
944 }
945 // Compress the old one if enabled
946 if ((fCompress) && (detectorOld > -1)) {
947 if (fVerbose > 1) {
948 printf("AliTRDdigitizer::MakeDigits -- ");
e153aaf6 949 printf("Compress the old container ...");
dd9a6ee3 950 }
793ff80c 951 signals->Compress(1,0);
952 for (iDict = 0; iDict < kNDict; iDict++) {
953 dictionary[iDict]->Compress(1,0);
dd9a6ee3 954 }
793ff80c 955 if (fVerbose > 1) printf("done\n");
9d0b222b 956 }
793ff80c 957 // Get the new container
958 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
959 if (signals->GetNtime() == 0) {
960 // Allocate a new one if not yet existing
961 if (fVerbose > 1) {
962 printf("AliTRDdigitizer::MakeDigits -- ");
963 printf("Allocate a new container ... ");
964 }
872a7aba 965 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 966 }
967 else {
968 // Expand an existing one
c1e4b257 969 if (fCompress) {
970 if (fVerbose > 1) {
971 printf("AliTRDdigitizer::MakeDigits -- ");
972 printf("Expand an existing container ... ");
973 }
974 signals->Expand();
793ff80c 975 }
793ff80c 976 }
977 // The same for the dictionary
978 for (iDict = 0; iDict < kNDict; iDict++) {
979 dictionary[iDict] = fDigits->GetDictionary(detector,iDict);
980 if (dictionary[iDict]->GetNtime() == 0) {
872a7aba 981 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 982 }
983 else {
984 if (fCompress) dictionary[iDict]->Expand();
985 }
986 }
987 if (fVerbose > 1) printf("done\n");
988 detectorOld = detector;
989 }
9d0b222b 990
793ff80c 991 // Rotate the sectors on top of each other
793ff80c 992 fGeo->Rotate(detector,pos,rot);
993
872a7aba 994 // The driftlength. It is negative if the hit is in the
995 // amplification region.
793ff80c 996 Float_t driftlength = time0 - rot[0];
793ff80c 997
872a7aba 998 // Take also the drift in the amplification region into account
999 // The drift length is at the moment still the same, regardless of
1000 // the position relativ to the wire. This non-isochronity needs still
1001 // to be implemented.
1002 Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
1003 if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
793ff80c 1004
1005 // Loop over all electrons of this hit
1006 // TR photons produce hits with negative charge
1007 Int_t nEl = ((Int_t) TMath::Abs(q));
1008 for (Int_t iEl = 0; iEl < nEl; iEl++) {
1009
793ff80c 1010 xyz[0] = rot[0];
1011 xyz[1] = rot[1];
1012 xyz[2] = rot[2];
1013
1014 // Electron attachment
1015 if (fElAttachOn) {
872a7aba 1016 if (gRandom->Rndm() < (driftlengthL * elAttachProp))
793ff80c 1017 continue;
1018 }
1019
1020 // Apply the diffusion smearing
1021 if (fDiffusionOn) {
1022 if (!(Diffusion(driftlengthL,xyz))) continue;
da581aea 1023 }
f7336fa3 1024
872a7aba 1025 // Apply E x B effects (depends on drift direction)
793ff80c 1026 if (fExBOn) {
872a7aba 1027 if (!(ExB(driftlength+kAmWidth,xyz))) continue;
793ff80c 1028 }
f7336fa3 1029
872a7aba 1030 // The electron position after diffusion and ExB in pad coordinates
793ff80c 1031 // The pad row (z-direction)
872a7aba 1032 Int_t rowE = ((Int_t) ((xyz[2] - row0) * divideRow));
1033 if ((rowE < 0) || (rowE >= nRowMax)) continue;
793ff80c 1034
872a7aba 1035 // The pad column (rphi-direction)
1036 Int_t colE = ((Int_t) ((xyz[1] - col0) * divideCol));
1037 if ((colE < 0) || (colE >= nColMax)) continue;
1038
1039 // The time bin (negative for hits in the amplification region)
1040 // In the amplification region the electrons drift from both sides
1041 // to the middle (anode wire plane)
1042 Float_t timeDist = time0 - xyz[0];
1043 Float_t timeOffset = 0;
1044 Int_t timeE = 0;
1045 if (timeDist > 0) {
1046 // The time bin
1047 timeE = ((Int_t) (timeDist * divideTime));
1048 // The distance of the position to the middle of the timebin
1049 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
1050 }
1051 else {
1052 // Difference between half of the amplification gap width and
1053 // the distance to the anode wire
1054 Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
1055 // The time bin
1056 timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
1057 // The distance of the position to the middle of the timebin
1058 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
1059 }
1060
793ff80c 1061 // Apply the gas gain including fluctuations
1062 Float_t ggRndm = 0.0;
1063 do {
1064 ggRndm = gRandom->Rndm();
1065 } while (ggRndm <= 0);
1066 Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
1067
793ff80c 1068 // Apply the pad response
793ff80c 1069 if (fPRFOn) {
1070 // The distance of the electron to the center of the pad
1071 // in units of pad width
1072 Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize)
872a7aba 1073 * divideCol;
793ff80c 1074 if (!(PadResponse(signal,dist,padSignal))) continue;
1075 }
1076 else {
1077 padSignal[0] = 0.0;
1078 padSignal[1] = signal;
1079 padSignal[2] = 0.0;
1080 }
f7336fa3 1081
872a7aba 1082 // Sample the time response inside the drift region
1083 // + additional time bins before and after.
1084 // The sampling is done always in the middle of the time bin
1085 for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
1086 ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
6244debe 1087 ;iTimeBin++) {
793ff80c 1088
1089 // Apply the time response
1090 Float_t timeResponse = 1.0;
1091 if (fTRFOn) {
1092 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
1093 timeResponse = TimeResponse(time);
1094 }
f7336fa3 1095
872a7aba 1096 signalOld[0] = 0.0;
1097 signalOld[1] = 0.0;
1098 signalOld[2] = 0.0;
1099
c3a4830f 1100 for (iPad = 0; iPad < kNpad; iPad++) {
872a7aba 1101
793ff80c 1102 Int_t colPos = colE + iPad - 1;
1103 if (colPos < 0) continue;
1104 if (colPos >= nColMax) break;
872a7aba 1105
1106 // Add the signals
1107 // Note: The time bin number is shifted by nTimeBefore to avoid negative
db30bf0f 1108 // time bins. This has to be subtracted later.
872a7aba 1109 Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
1110 signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
793ff80c 1111 signalOld[iPad] += padSignal[iPad] * timeResponse;
872a7aba 1112 signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
f7336fa3 1113
872a7aba 1114 // Store the track index in the dictionary
1115 // Note: We store index+1 in order to allow the array to be compressed
1116 if (signalOld[iPad] > 0) {
71d9fa7b 1117 for (iDict = 0; iDict < kNDict; iDict++) {
872a7aba 1118 Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
1119 ,colPos
1120 ,iCurrentTimeBin);
71d9fa7b 1121 if (oldTrack == track+1) break;
71d9fa7b 1122 if (oldTrack == 0) {
872a7aba 1123 dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
71d9fa7b 1124 break;
1125 }
1126 }
793ff80c 1127 }
872a7aba 1128
1129 }
f7336fa3 1130
f7336fa3 1131 }
1132
793ff80c 1133 }
f7336fa3 1134
793ff80c 1135 }
f7336fa3 1136
793ff80c 1137 } // All hits finished
f7336fa3 1138
793ff80c 1139 printf("AliTRDdigitizer::MakeDigits -- ");
1140 printf("Finished analyzing %d hits\n",countHits);
1141
6244debe 1142 // The total conversion factor
1143 Float_t convert = kEl2fC * fPadCoupling * fTimeCoupling * fChipGain;
1144
793ff80c 1145 // Loop through all chambers to finalize the digits
1146 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1147
872a7aba 1148 Int_t plane = fGeo->GetPlane(iDet);
1149 Int_t sector = fGeo->GetSector(iDet);
1150 Int_t chamber = fGeo->GetChamber(iDet);
1151 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1152 Int_t nColMax = fGeo->GetColMax(plane);
1153 Int_t nTimeMax = fGeo->GetTimeMax();
1154 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 1155
793ff80c 1156 if (fVerbose > 0) {
1157 printf("AliTRDdigitizer::MakeDigits -- ");
1158 printf("Digitization for chamber %d\n",iDet);
1159 }
da581aea 1160
793ff80c 1161 // Add a container for the digits of this detector
1162 digits = fDigits->GetDigits(iDet);
1163 // Allocate memory space for the digits buffer
872a7aba 1164 digits->Allocate(nRowMax,nColMax,nTimeTotal);
da581aea 1165
793ff80c 1166 // Get the signal container
1167 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
1168 if (signals->GetNtime() == 0) {
1169 // Create missing containers
872a7aba 1170 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1171 }
1172 else {
1173 // Expand the container if neccessary
1174 if (fCompress) signals->Expand();
1175 }
1176 // Create the missing dictionary containers
1177 for (iDict = 0; iDict < kNDict; iDict++) {
1178 dictionary[iDict] = fDigits->GetDictionary(iDet,iDict);
1179 if (dictionary[iDict]->GetNtime() == 0) {
872a7aba 1180 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1181 }
1182 }
f7336fa3 1183
793ff80c 1184 Int_t nDigits = 0;
1185
6244debe 1186 // Don't create noise in detectors that are switched off
1187 if (CheckDetector(plane,chamber,sector)) {
1188
1189 // Create the digits for this chamber
872a7aba 1190 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1191 for (iCol = 0; iCol < nColMax; iCol++ ) {
1192 for (iTime = 0; iTime < nTimeTotal; iTime++) {
6244debe 1193
1194 // Create summable digits
1195 if (fSDigits) {
1196
872a7aba 1197 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
6244debe 1198 Int_t adc = 0;
1199 if (signalAmp >= fSinRange) {
1200 adc = ((Int_t) fSoutRange);
1201 }
1202 else {
1203 adc = ((Int_t) (signalAmp * (fSoutRange / fSinRange)));
1204 }
1205 nDigits++;
872a7aba 1206 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
f7336fa3 1207
c1e4b257 1208 }
6244debe 1209 // Create normal digits
1210 else {
1211
872a7aba 1212 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
6244debe 1213
1214 // Add the noise
1215 signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0);
1216 // Convert to mV
1217 signalAmp *= convert;
1218 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
1219 // signal is larger than fADCinRange
1220 Int_t adc = 0;
1221 if (signalAmp >= fADCinRange) {
1222 adc = ((Int_t) fADCoutRange);
1223 }
1224 else {
1225 adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
1226 }
1227
1228 // Store the amplitude of the digit if above threshold
1229 if (adc > fADCthreshold) {
1230 if (fVerbose > 2) {
1231 printf(" iRow = %d, iCol = %d, iTime = %d\n"
1232 ,iRow,iCol,iTime);
1233 printf(" signal = %f, adc = %d\n",signalAmp,adc);
1234 }
1235 nDigits++;
872a7aba 1236 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
6244debe 1237 }
f7336fa3 1238
6244debe 1239 }
1240
1241 }
1242 }
793ff80c 1243 }
6244debe 1244
793ff80c 1245 }
1246
1247 // Compress the arrays
1248 digits->Compress(1,0);
1249 for (iDict = 0; iDict < kNDict; iDict++) {
1250 dictionary[iDict]->Compress(1,0);
1251 }
f7336fa3 1252
793ff80c 1253 totalSizeDigits += digits->GetSize();
1254 totalSizeDict0 += dictionary[0]->GetSize();
1255 totalSizeDict1 += dictionary[1]->GetSize();
1256 totalSizeDict2 += dictionary[2]->GetSize();
f7336fa3 1257
c1e4b257 1258 Float_t nPixel = nRowMax * nColMax * nTimeMax;
793ff80c 1259 printf("AliTRDdigitizer::MakeDigits -- ");
c1e4b257 1260 printf("Found %d digits in detector %d (%3.0f).\n"
1261 ,nDigits,iDet
1262 ,100.0 * ((Float_t) nDigits) / nPixel);
da581aea 1263
793ff80c 1264 if (fCompress) signals->Compress(1,0);
f7336fa3 1265
f7336fa3 1266 }
1267
da581aea 1268 printf("AliTRDdigitizer::MakeDigits -- ");
8230f242 1269 printf("Total number of analyzed hits = %d\n",countHits);
da581aea 1270
f7336fa3 1271 printf("AliTRDdigitizer::MakeDigits -- ");
1272 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
1273 ,totalSizeDict0
1274 ,totalSizeDict1
1275 ,totalSizeDict2);
1276
1277 return kTRUE;
1278
1279}
1280
793ff80c 1281//_____________________________________________________________________________
1282Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
1283{
1284 //
1285 // Checks whether a detector is enabled
1286 //
1287
1288 if ((fTRD->GetSensChamber() >= 0) &&
1289 (fTRD->GetSensChamber() != chamber)) return kFALSE;
1290 if ((fTRD->GetSensPlane() >= 0) &&
c1e4b257 1291 (fTRD->GetSensPlane() != plane)) return kFALSE;
793ff80c 1292 if ( fTRD->GetSensSector() >= 0) {
1293 Int_t sens1 = fTRD->GetSensSector();
1294 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
1295 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
1296 * AliTRDgeometry::Nsect();
1297 if (sens1 < sens2) {
1298 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
1299 }
1300 else {
1301 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
1302 }
1303 }
1304
1305 return kTRUE;
1306
1307}
1308
f7336fa3 1309//_____________________________________________________________________________
1310Bool_t AliTRDdigitizer::WriteDigits()
1311{
1312 //
1313 // Writes out the TRD-digits and the dictionaries
1314 //
1315
1316 // Create the branches
1317 if (!(gAlice->TreeD()->GetBranch("TRDdigits"))) {
6244debe 1318 return kFALSE;
f7336fa3 1319 }
1320
da581aea 1321 // Store the digits and the dictionary in the tree
1322 fDigits->WriteDigits();
f7336fa3 1323
1324 // Write the new tree into the input file (use overwrite option)
71d9fa7b 1325 Char_t treeName[15];
f7336fa3 1326 sprintf(treeName,"TreeD%d",fEvent);
1327 printf("AliTRDdigitizer::WriteDigits -- ");
1328 printf("Write the digits tree %s for event %d.\n"
1329 ,treeName,fEvent);
2ab0c725 1330 gAlice->TreeD()->Write(treeName,TObject::kOverwrite);
f7336fa3 1331
1332 return kTRUE;
1333
1334}
793ff80c 1335
1336//_____________________________________________________________________________
db30bf0f 1337Float_t AliTRDdigitizer::GetDiffusionL(Float_t vd, Float_t b)
793ff80c 1338{
1339 //
db30bf0f 1340 // Returns the longitudinal diffusion coefficient for a given drift
1341 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1342 // The values are according to a GARFIELD simulation.
793ff80c 1343 //
1344
db30bf0f 1345 const Int_t kNb = 5;
1346 Float_t p0[kNb] = { 0.007440, 0.007493, 0.007513, 0.007672, 0.007831 };
1347 Float_t p1[kNb] = { 0.019252, 0.018912, 0.018636, 0.018012, 0.017343 };
1348 Float_t p2[kNb] = { -0.005042, -0.004926, -0.004867, -0.004650, -0.004424 };
1349 Float_t p3[kNb] = { 0.000195, 0.000189, 0.000195, 0.000182, 0.000169 };
1350
1351 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1352 ib = TMath::Max( 0,ib);
1353 ib = TMath::Min(kNb,ib);
1354
1355 Float_t diff = p0[ib]
1356 + p1[ib] * vd
1357 + p2[ib] * vd*vd
1358 + p3[ib] * vd*vd*vd;
1359
1360 return diff;
1361
1362}
1363
1364//_____________________________________________________________________________
1365Float_t AliTRDdigitizer::GetDiffusionT(Float_t vd, Float_t b)
1366{
1367 //
1368 // Returns the transverse diffusion coefficient for a given drift
1369 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1370 // The values are according to a GARFIELD simulation.
1371 //
1372
1373 const Int_t kNb = 5;
1374 Float_t p0[kNb] = { 0.009550, 0.009599, 0.009674, 0.009757, 0.009850 };
1375 Float_t p1[kNb] = { 0.006667, 0.006539, 0.006359, 0.006153, 0.005925 };
1376 Float_t p2[kNb] = { -0.000853, -0.000798, -0.000721, -0.000635, -0.000541 };
1377 Float_t p3[kNb] = { 0.000131, 0.000122, 0.000111, 0.000098, 0.000085 };
1378
1379 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1380 ib = TMath::Max( 0,ib);
1381 ib = TMath::Min(kNb,ib);
1382
1383 Float_t diff = p0[ib]
1384 + p1[ib] * vd
1385 + p2[ib] * vd*vd
1386 + p3[ib] * vd*vd*vd;
1387
1388 return diff;
1389
1390}
1391
1392//_____________________________________________________________________________
1393Float_t AliTRDdigitizer::GetOmegaTau(Float_t vd, Float_t b)
1394{
1395 //
1396 // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
1397 // and a B-field <b> for Xe/CO2 (15%).
1398 // The values are according to a GARFIELD simulation.
1399 //
1400
1401 const Int_t kNb = 5;
1402 Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
1403 Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
1404 Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
1405 Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
1406
1407 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1408 ib = TMath::Max( 0,ib);
1409 ib = TMath::Min(kNb,ib);
1410
1411 Float_t alphaL = p0[ib]
1412 + p1[ib] * vd
1413 + p2[ib] * vd*vd
1414 + p3[ib] * vd*vd*vd;
1415
1416 return TMath::Tan(alphaL);
793ff80c 1417
1418}
1419