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Add detailed geometry and simple simulator
[u/mrichter/AliRoot.git] / TRD / AliTRDdigitizer.cxx
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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$Log$
16bf9884 18Revision 1.25 2001/06/27 09:54:44 cblume
19Moved fField initialization to InitDetector()
20
88fd7ccb 21Revision 1.24 2001/05/21 16:45:47 hristov
22Last minute changes (C.Blume)
23
db30bf0f 24Revision 1.23 2001/05/07 08:04:48 cblume
25New TRF and PRF. Speedup of the code. Digits from amplification region included
26
872a7aba 27Revision 1.22 2001/03/30 14:40:14 cblume
28Update of the digitization parameter
29
a3c76cdc 30Revision 1.21 2001/03/13 09:30:35 cblume
31Update of digitization. Moved digit branch definition to AliTRD
32
6244debe 33Revision 1.20 2001/02/25 20:19:00 hristov
34Minor correction: loop variable declared only once for HP, Sun
35
c3a4830f 36Revision 1.19 2001/02/14 18:22:26 cblume
37Change in the geometry of the padplane
38
71d9fa7b 39Revision 1.18 2001/01/26 19:56:57 hristov
40Major upgrade of AliRoot code
41
2ab0c725 42Revision 1.17 2000/12/08 12:53:27 cblume
43Change in Copy() function for HP-compiler
44
1948ba0c 45Revision 1.16 2000/12/07 12:20:46 cblume
46Go back to array compression. Use sampled PRF to speed up digitization
47
e153aaf6 48Revision 1.15 2000/11/23 14:34:08 cblume
49Fixed bug in expansion routine of arrays (initialize buffers properly)
50
259b9e4b 51Revision 1.14 2000/11/20 08:54:44 cblume
52Switch off compression as default
53
c1e4b257 54Revision 1.13 2000/11/10 14:57:52 cblume
55Changes in the geometry constants for the DEC compiler
56
dd56b762 57Revision 1.12 2000/11/01 14:53:20 cblume
58Merge with TRD-develop
59
793ff80c 60Revision 1.1.4.9 2000/10/26 17:00:22 cblume
61Fixed bug in CheckDetector()
62
63Revision 1.1.4.8 2000/10/23 13:41:35 cblume
64Added protection against Log(0) in the gas gain calulation
65
66Revision 1.1.4.7 2000/10/17 02:27:34 cblume
67Get rid of global constants
68
69Revision 1.1.4.6 2000/10/16 01:16:53 cblume
70Changed timebin 0 to be the one closest to the readout
71
72Revision 1.1.4.5 2000/10/15 23:34:29 cblume
73Faster version of the digitizer
74
75Revision 1.1.4.4 2000/10/06 16:49:46 cblume
76Made Getters const
77
78Revision 1.1.4.3 2000/10/04 16:34:58 cblume
79Replace include files by forward declarations
80
81Revision 1.1.4.2 2000/09/22 14:41:10 cblume
82Bug fix in PRF. Included time response. New structure
83
eda4336d 84Revision 1.10 2000/10/05 07:27:53 cblume
85Changes in the header-files by FCA
86
6798b56e 87Revision 1.9 2000/10/02 21:28:19 fca
88Removal of useless dependecies via forward declarations
89
94de3818 90Revision 1.8 2000/06/09 11:10:07 cblume
91Compiler warnings and coding conventions, next round
92
dd9a6ee3 93Revision 1.7 2000/06/08 18:32:58 cblume
94Make code compliant to coding conventions
95
8230f242 96Revision 1.6 2000/06/07 16:27:32 cblume
97Try to remove compiler warnings on Sun and HP
98
9d0b222b 99Revision 1.5 2000/05/09 16:38:57 cblume
100Removed PadResponse(). Merge problem
101
f0a7bf65 102Revision 1.4 2000/05/08 15:53:45 cblume
103Resolved merge conflict
104
da581aea 105Revision 1.3 2000/04/28 14:49:27 cblume
106Only one declaration of iDict in MakeDigits()
107
108Revision 1.1.4.1 2000/05/08 14:42:04 cblume
109Introduced AliTRDdigitsManager
28329a48 110
1befd3b2 111Revision 1.1 2000/02/28 19:00:13 cblume
112Add new TRD classes
113
f7336fa3 114*/
115
116///////////////////////////////////////////////////////////////////////////////
117// //
118// Creates and handles digits from TRD hits //
119// //
120// The following effects are included: //
121// - Diffusion //
122// - ExB effects //
123// - Gas gain including fluctuations //
124// - Pad-response (simple Gaussian approximation) //
125// - Electronics noise //
126// - Electronics gain //
127// - Digitization //
128// - ADC threshold //
129// The corresponding parameter can be adjusted via the various //
130// Set-functions. If these parameters are not explicitly set, default //
131// values are used (see Init-function). //
132// To produce digits from a root-file with TRD-hits use the //
133// slowDigitsCreate.C macro. //
134// //
135///////////////////////////////////////////////////////////////////////////////
136
6798b56e 137#include <stdlib.h>
138
f7336fa3 139#include <TMath.h>
140#include <TVector.h>
141#include <TRandom.h>
94de3818 142#include <TROOT.h>
143#include <TTree.h>
793ff80c 144#include <TFile.h>
145#include <TF1.h>
146
147#include "AliRun.h"
db30bf0f 148#include "AliMagF.h"
f7336fa3 149
150#include "AliTRD.h"
793ff80c 151#include "AliTRDhit.h"
f7336fa3 152#include "AliTRDdigitizer.h"
da581aea 153#include "AliTRDdataArrayI.h"
154#include "AliTRDdataArrayF.h"
793ff80c 155#include "AliTRDsegmentArray.h"
da581aea 156#include "AliTRDdigitsManager.h"
793ff80c 157#include "AliTRDgeometry.h"
f7336fa3 158
159ClassImp(AliTRDdigitizer)
160
161//_____________________________________________________________________________
162AliTRDdigitizer::AliTRDdigitizer():TNamed()
163{
164 //
165 // AliTRDdigitizer default constructor
166 //
167
6244debe 168 fInputFile = NULL;
169 fDigits = NULL;
170 fTRD = NULL;
171 fGeo = NULL;
6244debe 172 fPRFsmp = NULL;
872a7aba 173 fTRFsmp = NULL;
6244debe 174
175 fEvent = 0;
176 fGasGain = 0.0;
177 fNoise = 0.0;
178 fChipGain = 0.0;
179 fSinRange = 0.0;
180 fSoutRange = 0.0;
181 fADCoutRange = 0.0;
182 fADCinRange = 0.0;
183 fADCthreshold = 0;
184 fDiffusionOn = 0;
185 fDiffusionT = 0.0;
186 fDiffusionL = 0.0;
187 fElAttachOn = 0;
188 fElAttachProp = 0.0;
189 fExBOn = 0;
190 fOmegaTau = 0.0;
191 fPRFOn = 0;
192 fTRFOn = 0;
193 fDriftVelocity = 0.0;
194 fPadCoupling = 0.0;
195 fTimeCoupling = 0.0;
196 fTimeBinWidth = 0.0;
db30bf0f 197 fField = 0.0;
6244debe 198
199 fPRFbin = 0;
200 fPRFlo = 0.0;
201 fPRFhi = 0.0;
202 fPRFwid = 0.0;
203 fPRFpad = 0;
204 fTRFbin = 0;
205 fTRFlo = 0.0;
206 fTRFhi = 0.0;
207 fTRFwid = 0.0;
208
209 fCompress = kTRUE;
210 fVerbose = 1;
211 fSDigits = kFALSE;
f7336fa3 212
213}
214
215//_____________________________________________________________________________
216AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
217 :TNamed(name,title)
218{
219 //
220 // AliTRDdigitizer default constructor
221 //
222
da581aea 223 fInputFile = NULL;
224 fDigits = NULL;
225 fTRD = NULL;
226 fGeo = NULL;
e153aaf6 227 fPRFsmp = NULL;
872a7aba 228 fTRFsmp = NULL;
f7336fa3 229
da581aea 230 fEvent = 0;
f7336fa3 231
e153aaf6 232 fCompress = kTRUE;
793ff80c 233 fVerbose = 1;
6244debe 234 fSDigits = kFALSE;
793ff80c 235
f7336fa3 236 Init();
237
238}
239
8230f242 240//_____________________________________________________________________________
dd9a6ee3 241AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
8230f242 242{
243 //
244 // AliTRDdigitizer copy constructor
245 //
246
dd9a6ee3 247 ((AliTRDdigitizer &) d).Copy(*this);
8230f242 248
249}
250
f7336fa3 251//_____________________________________________________________________________
252AliTRDdigitizer::~AliTRDdigitizer()
253{
8230f242 254 //
255 // AliTRDdigitizer destructor
256 //
f7336fa3 257
258 if (fInputFile) {
259 fInputFile->Close();
260 delete fInputFile;
261 }
262
da581aea 263 if (fDigits) {
264 delete fDigits;
f7336fa3 265 }
266
f7336fa3 267}
268
8230f242 269//_____________________________________________________________________________
dd9a6ee3 270AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
271{
272 //
273 // Assignment operator
274 //
275
276 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
277 return *this;
278
279}
280
281//_____________________________________________________________________________
282void AliTRDdigitizer::Copy(TObject &d)
8230f242 283{
284 //
285 // Copy function
286 //
287
1948ba0c 288 Int_t iBin;
289
6244debe 290 ((AliTRDdigitizer &) d).fInputFile = NULL;
291 ((AliTRDdigitizer &) d).fDigits = NULL;
292 ((AliTRDdigitizer &) d).fTRD = NULL;
293 ((AliTRDdigitizer &) d).fGeo = NULL;
294
295 ((AliTRDdigitizer &) d).fEvent = 0;
296
297 ((AliTRDdigitizer &) d).fGasGain = fGasGain;
298 ((AliTRDdigitizer &) d).fNoise = fNoise;
299 ((AliTRDdigitizer &) d).fChipGain = fChipGain;
300 ((AliTRDdigitizer &) d).fSoutRange = fSoutRange;
301 ((AliTRDdigitizer &) d).fSinRange = fSinRange;
302 ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
303 ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
304 ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
305 ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
306 ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
307 ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
308 ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
309 ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
310 ((AliTRDdigitizer &) d).fExBOn = fExBOn;
311 ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
312 ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
313 ((AliTRDdigitizer &) d).fDriftVelocity = fDriftVelocity;
314 ((AliTRDdigitizer &) d).fPadCoupling = fPadCoupling;
315 ((AliTRDdigitizer &) d).fTimeCoupling = fTimeCoupling;
316 ((AliTRDdigitizer &) d).fTimeBinWidth = fTimeBinWidth;
db30bf0f 317 ((AliTRDdigitizer &) d).fField = fField;
6244debe 318 ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
319 ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
320
321 ((AliTRDdigitizer &) d).fCompress = fCompress;
322 ((AliTRDdigitizer &) d).fVerbose = fVerbose;
323 ((AliTRDdigitizer &) d).fSDigits = fSDigits;
dd9a6ee3 324
6244debe 325 ((AliTRDdigitizer &) d).fPRFbin = fPRFbin;
326 ((AliTRDdigitizer &) d).fPRFlo = fPRFlo;
327 ((AliTRDdigitizer &) d).fPRFhi = fPRFhi;
328 ((AliTRDdigitizer &) d).fPRFwid = fPRFwid;
329 ((AliTRDdigitizer &) d).fPRFpad = fPRFpad;
e153aaf6 330 if (((AliTRDdigitizer &) d).fPRFsmp) delete ((AliTRDdigitizer &) d).fPRFsmp;
331 ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin];
1948ba0c 332 for (iBin = 0; iBin < fPRFbin; iBin++) {
e153aaf6 333 ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin];
334 }
6244debe 335 ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
336 ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
337 ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
338 ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
872a7aba 339 if (((AliTRDdigitizer &) d).fTRFsmp) delete ((AliTRDdigitizer &) d).fTRFsmp;
340 ((AliTRDdigitizer &) d).fTRFsmp = new Float_t[fTRFbin];
1948ba0c 341 for (iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 342 ((AliTRDdigitizer &) d).fTRFsmp[iBin] = fTRFsmp[iBin];
6244debe 343 }
344
8230f242 345}
346
f7336fa3 347//_____________________________________________________________________________
348Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz)
349{
350 //
351 // Applies the diffusion smearing to the position of a single electron
352 //
353
354 Float_t driftSqrt = TMath::Sqrt(driftlength);
355 Float_t sigmaT = driftSqrt * fDiffusionT;
356 Float_t sigmaL = driftSqrt * fDiffusionL;
357 xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
358 xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
359 xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
793ff80c 360
f7336fa3 361 return 1;
362
363}
364
365//_____________________________________________________________________________
366Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz)
367{
368 //
369 // Applies E x B effects to the position of a single electron
370 //
371
372 xyz[0] = xyz[0];
793ff80c 373 xyz[1] = xyz[1] + fOmegaTau * driftlength;
f7336fa3 374 xyz[2] = xyz[2];
375
376 return 1;
377
378}
379
793ff80c 380//_____________________________________________________________________________
381Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad)
382{
383 //
384 // Applies the pad response
385 //
386
e153aaf6 387 Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid));
388
389 Int_t iBin0 = iBin - fPRFpad;
390 Int_t iBin1 = iBin;
391 Int_t iBin2 = iBin + fPRFpad;
392
393 if ((iBin0 >= 0) && (iBin2 < fPRFbin)) {
394
395 pad[0] = signal * fPRFsmp[iBin0];
396 pad[1] = signal * fPRFsmp[iBin1];
397 pad[2] = signal * fPRFsmp[iBin2];
398
793ff80c 399 return 1;
e153aaf6 400
793ff80c 401 }
402 else {
e153aaf6 403
793ff80c 404 return 0;
e153aaf6 405
793ff80c 406 }
407
408}
409
410//_____________________________________________________________________________
411Float_t AliTRDdigitizer::TimeResponse(Float_t time)
412{
413 //
414 // Applies the preamp shaper time response
415 //
416
417 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
418 if ((iBin >= 0) && (iBin < fTRFbin)) {
872a7aba 419 return fTRFsmp[iBin];
793ff80c 420 }
421 else {
422 return 0.0;
423 }
424
425}
426
f7336fa3 427//_____________________________________________________________________________
428void AliTRDdigitizer::Init()
429{
430 //
431 // Initializes the digitization procedure with standard values
432 //
433
434 // The default parameter for the digitization
db30bf0f 435 fGasGain = 2800.;
436 fChipGain = 6.1;
6244debe 437 fNoise = 1000.;
438 fADCoutRange = 1023.; // 10-bit ADC
a3c76cdc 439 fADCinRange = 1000.; // 1V input range
6244debe 440 fADCthreshold = 1;
441
442 // For the summable digits
443 fSinRange = 1000000.;
444 fSoutRange = 1000000.;
f7336fa3 445
db30bf0f 446 // The drift velocity (cm / mus)
447 fDriftVelocity = 1.5;
448
db30bf0f 449 // Diffusion on
6244debe 450 fDiffusionOn = 1;
db30bf0f 451
452 // E x B effects
453 fExBOn = 0;
f7336fa3 454
455 // Propability for electron attachment
6244debe 456 fElAttachOn = 0;
457 fElAttachProp = 0.0;
f7336fa3 458
da581aea 459 // The pad response function
6244debe 460 fPRFOn = 1;
872a7aba 461
462 // The time response function
463 fTRFOn = 1;
da581aea 464
6244debe 465 // The pad coupling factor (same number as for the TPC)
466 fPadCoupling = 0.5;
467
468 // The time coupling factor (same number as for the TPC)
469 fTimeCoupling = 0.4;
470
6244debe 471}
472
473//_____________________________________________________________________________
474void AliTRDdigitizer::ReInit()
475{
476 //
872a7aba 477 // Reinitializes the digitization procedure after a change in the parameter
6244debe 478 //
479
872a7aba 480 if (!fGeo) {
481 printf("AliTRDdigitizer::ReInit -- ");
482 printf("No geometry defined. Run InitDetector() first\n");
483 exit(1);
484 }
485
6244debe 486 // Calculate the time bin width in ns
487 fTimeBinWidth = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
488
872a7aba 489 // The range and the binwidth for the sampled TRF
490 fTRFbin = 100;
db30bf0f 491 // Start 0.2 mus before the signal
492 fTRFlo = -0.2 * fDriftVelocity;
872a7aba 493 // End the maximum driftlength after the signal
494 fTRFhi = AliTRDgeometry::DrThick()
495 + fGeo->GetTimeAfter() * fGeo->GetTimeBinSize();
496 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
6244debe 497
db30bf0f 498 // Transverse and longitudinal diffusion coefficients (Xe/CO2)
499 fDiffusionT = GetDiffusionT(fDriftVelocity,fField);
500 fDiffusionL = GetDiffusionL(fDriftVelocity,fField);
501
502 // omega * tau.= tan(Lorentz-angle)
503 fOmegaTau = GetOmegaTau(fDriftVelocity,fField);
504
6244debe 505 // The Lorentz factor
506 if (fExBOn) {
507 fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
508 }
509 else {
510 fLorentzFactor = 1.0;
511 }
793ff80c 512
513}
514
515//_____________________________________________________________________________
6244debe 516void AliTRDdigitizer::SampleTRF()
793ff80c 517{
518 //
6244debe 519 // Samples the time response function
872a7aba 520 // It is defined according to Vasiles simulation of the preamp shaper
521 // output and includes the effect of the ion tail (based on Tariqs
522 // Garfield simulation) and a shaping time of 125 ns FWHM
793ff80c 523 //
524
872a7aba 525 Int_t ipos1;
526 Int_t ipos2;
527 Float_t diff;
528
db30bf0f 529 const Int_t kNpasa = 200;
530 Float_t time[kNpasa] = { -0.280000, -0.270000, -0.260000, -0.250000
531 , -0.240000, -0.230000, -0.220000, -0.210000
532 , -0.200000, -0.190000, -0.180000, -0.170000
533 , -0.160000, -0.150000, -0.140000, -0.130000
534 , -0.120000, -0.110000, -0.100000, -0.090000
535 , -0.080000, -0.070000, -0.060000, -0.050000
536 , -0.040000, -0.030000, -0.020000, -0.010000
537 , -0.000000, 0.010000, 0.020000, 0.030000
538 , 0.040000, 0.050000, 0.060000, 0.070000
539 , 0.080000, 0.090000, 0.100000, 0.110000
540 , 0.120000, 0.130000, 0.140000, 0.150000
541 , 0.160000, 0.170000, 0.180000, 0.190000
542 , 0.200000, 0.210000, 0.220000, 0.230000
543 , 0.240000, 0.250000, 0.260000, 0.270000
544 , 0.280000, 0.290000, 0.300000, 0.310000
545 , 0.320000, 0.330000, 0.340000, 0.350000
546 , 0.360000, 0.370000, 0.380000, 0.390000
547 , 0.400000, 0.410000, 0.420000, 0.430000
548 , 0.440000, 0.450000, 0.460000, 0.470000
549 , 0.480000, 0.490000, 0.500000, 0.510000
550 , 0.520000, 0.530000, 0.540000, 0.550000
551 , 0.560000, 0.570000, 0.580000, 0.590000
552 , 0.600000, 0.610000, 0.620000, 0.630000
553 , 0.640000, 0.650000, 0.660000, 0.670000
554 , 0.680000, 0.690000, 0.700000, 0.710000
555 , 0.720000, 0.730000, 0.740000, 0.750000
556 , 0.760000, 0.770000, 0.780000, 0.790000
557 , 0.800000, 0.810000, 0.820000, 0.830000
558 , 0.840000, 0.850000, 0.860000, 0.870000
559 , 0.880000, 0.890000, 0.900000, 0.910000
560 , 0.920000, 0.930000, 0.940000, 0.950000
561 , 0.960000, 0.970000, 0.980000, 0.990000
562 , 1.000000, 1.010000, 1.020000, 1.030000
563 , 1.040000, 1.050000, 1.060000, 1.070000
564 , 1.080000, 1.090000, 1.100000, 1.110000
565 , 1.120000, 1.130000, 1.140000, 1.150000
566 , 1.160000, 1.170000, 1.180000, 1.190000
567 , 1.200000, 1.210000, 1.220000, 1.230000
568 , 1.240000, 1.250000, 1.260000, 1.270000
569 , 1.280000, 1.290000, 1.300000, 1.310000
570 , 1.320000, 1.330000, 1.340000, 1.350000
571 , 1.360000, 1.370000, 1.380000, 1.390000
572 , 1.400000, 1.410000, 1.420000, 1.430000
573 , 1.440000, 1.450000, 1.460000, 1.470000
574 , 1.480000, 1.490000, 1.500000, 1.510000
575 , 1.520000, 1.530000, 1.540000, 1.550000
576 , 1.560000, 1.570000, 1.580000, 1.590000
577 , 1.600000, 1.610000, 1.620000, 1.630000
578 , 1.640000, 1.650000, 1.660000, 1.670000
579 , 1.680000, 1.690000, 1.700000, 1.710000 };
580
581 Float_t signal[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
582 , 0.000000, 0.000000, 0.000000, 0.000000
583 , 0.000000, 0.000000, 0.000000, 0.000000
584 , 0.000000, 0.000000, 0.000000, 0.000098
585 , 0.003071, 0.020056, 0.066053, 0.148346
586 , 0.263120, 0.398496, 0.540226, 0.674436
587 , 0.790977, 0.883083, 0.947744, 0.985714
588 , 0.999248, 0.992105, 0.967669, 0.930827
589 , 0.884586, 0.833083, 0.778571, 0.723684
590 , 0.669173, 0.617293, 0.567669, 0.521805
591 , 0.479699, 0.440977, 0.405639, 0.373985
592 , 0.345526, 0.320038, 0.297256, 0.276917
593 , 0.258797, 0.242632, 0.228195, 0.215301
594 , 0.203759, 0.193383, 0.184023, 0.175564
595 , 0.167895, 0.160940, 0.154549, 0.148722
596 , 0.143308, 0.138346, 0.133722, 0.129398
597 , 0.125376, 0.121617, 0.118045, 0.114699
598 , 0.111541, 0.108571, 0.105714, 0.103008
599 , 0.100414, 0.097970, 0.095602, 0.093346
600 , 0.091165, 0.089060, 0.087068, 0.085150
601 , 0.083308, 0.081541, 0.079812, 0.078158
602 , 0.076541, 0.075000, 0.073496, 0.072068
603 , 0.070677, 0.069286, 0.068008, 0.066729
604 , 0.065489, 0.064286, 0.063120, 0.061992
605 , 0.060902, 0.059850, 0.058797, 0.057820
606 , 0.056842, 0.055902, 0.054962, 0.054060
607 , 0.053158, 0.052293, 0.051466, 0.050639
608 , 0.049850, 0.049060, 0.048308, 0.047556
609 , 0.046842, 0.046128, 0.045451, 0.044774
610 , 0.044098, 0.043459, 0.042820, 0.042218
611 , 0.041617, 0.041015, 0.040451, 0.039887
612 , 0.039323, 0.038797, 0.038271, 0.037744
613 , 0.037237, 0.036744, 0.036259, 0.035786
614 , 0.035323, 0.034872, 0.034429, 0.033996
615 , 0.033575, 0.033162, 0.032756, 0.032361
616 , 0.031974, 0.031594, 0.031222, 0.030857
617 , 0.030496, 0.030143, 0.029793, 0.029451
618 , 0.029109, 0.028774, 0.028444, 0.028113
619 , 0.027793, 0.027477, 0.027165, 0.026861
620 , 0.026564, 0.026271, 0.025981, 0.025699
621 , 0.025421, 0.025147, 0.024880, 0.024613
622 , 0.024353, 0.024094, 0.023842, 0.023590
623 , 0.023346, 0.023102, 0.022865, 0.022628
624 , 0.022398, 0.022173, 0.021951, 0.021733
625 , 0.021519, 0.021308, 0.021098, 0.020891
626 , 0.020688, 0.020485, 0.020286, 0.020090
627 , 0.019895, 0.019707, 0.019519, 0.019335
628 , 0.019150, 0.018974, 0.018797, 0.018624
629 , 0.018451, 0.018282, 0.018113, 0.017947
630 , 0.017782, 0.017617, 0.017455, 0.017297 };
631
632 //for (Int_t ipasa = 0; ipasa < kNpasa; ipasa++) {
633 // time[ipasa] += 0.13;
88fd7ccb 634 // time[ipasa] *= 0.5;
db30bf0f 635 //}
872a7aba 636
637 if (fTRFsmp) delete fTRFsmp;
638 fTRFsmp = new Float_t[fTRFbin];
639
640 Float_t loTRF = TMath::Max(fTRFlo / fDriftVelocity,time[0]);
641 Float_t hiTRF = TMath::Min(fTRFhi / fDriftVelocity,time[kNpasa-1]);
793ff80c 642 Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
872a7aba 643
644 // Take the linear interpolation
793ff80c 645 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
872a7aba 646
6244debe 647 Float_t bin = (((Float_t) iBin) + 0.5) * binWidth + loTRF;
872a7aba 648 ipos1 = ipos2 = 0;
649 diff = 0;
650 do {
651 diff = bin - time[ipos2++];
652 } while (diff > 0);
653 ipos2--;
654 if (ipos2 > kNpasa) ipos2 = kNpasa - 1;
655 ipos1 = ipos2 - 1;
656
657 fTRFsmp[iBin] = signal[ipos2]
658 + diff * (signal[ipos2] - signal[ipos1])
659 / ( time[ipos2] - time[ipos1]);
660
793ff80c 661 }
662
f7336fa3 663}
664
e153aaf6 665//_____________________________________________________________________________
666void AliTRDdigitizer::SamplePRF()
667{
668 //
669 // Samples the pad response function
670 //
671
db30bf0f 672 const Int_t kPRFbin = 61;
673 Float_t prf[kPRFbin] = { 0.002340, 0.003380, 0.004900, 0.007080, 0.010220
674 , 0.014740, 0.021160, 0.030230, 0.042800, 0.059830
675 , 0.082030, 0.109700, 0.142550, 0.179840, 0.220610
676 , 0.263980, 0.309180, 0.355610, 0.402790, 0.450350
677 , 0.497930, 0.545190, 0.591740, 0.637100, 0.680610
678 , 0.721430, 0.758400, 0.790090, 0.814720, 0.830480
679 , 0.835930, 0.830480, 0.814710, 0.790070, 0.758390
680 , 0.721410, 0.680590, 0.637080, 0.591730, 0.545180
681 , 0.497920, 0.450340, 0.402790, 0.355610, 0.309190
682 , 0.263990, 0.220630, 0.179850, 0.142570, 0.109720
683 , 0.082040, 0.059830, 0.042820, 0.030230, 0.021170
684 , 0.014740, 0.010230, 0.007080, 0.004900, 0.003380
685 , 0.002340 };
686
687 fPRFlo = -1.5;
688 fPRFhi = 1.5;
689 fPRFbin = kPRFbin;
690 fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin);
691 fPRFpad = ((Int_t) (1.0 / fPRFwid));
692
e153aaf6 693 if (fPRFsmp) delete fPRFsmp;
694 fPRFsmp = new Float_t[fPRFbin];
695 for (Int_t iBin = 0; iBin < fPRFbin; iBin++) {
db30bf0f 696 fPRFsmp[iBin] = prf[iBin];
e153aaf6 697 }
698
699}
700
f7336fa3 701//_____________________________________________________________________________
702Bool_t AliTRDdigitizer::Open(const Char_t *name, Int_t nEvent)
703{
704 //
705 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
706 //
707
708 // Connect the AliRoot file containing Geometry, Kine, and Hits
709 fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(name);
710 if (!fInputFile) {
711 printf("AliTRDdigitizer::Open -- ");
712 printf("Open the ALIROOT-file %s.\n",name);
713 fInputFile = new TFile(name,"UPDATE");
714 }
715 else {
716 printf("AliTRDdigitizer::Open -- ");
717 printf("%s is already open.\n",name);
718 }
719
da581aea 720 gAlice = (AliRun*) fInputFile->Get("gAlice");
721 if (gAlice) {
722 printf("AliTRDdigitizer::Open -- ");
723 printf("AliRun object found on file.\n");
724 }
725 else {
726 printf("AliTRDdigitizer::Open -- ");
727 printf("Could not find AliRun object.\n");
728 return kFALSE;
729 }
f7336fa3 730
731 fEvent = nEvent;
732
733 // Import the Trees for the event nEvent in the file
734 Int_t nparticles = gAlice->GetEvent(fEvent);
735 if (nparticles <= 0) {
736 printf("AliTRDdigitizer::Open -- ");
737 printf("No entries in the trees for event %d.\n",fEvent);
738 return kFALSE;
739 }
740
793ff80c 741 return InitDetector();
742
743}
744
745//_____________________________________________________________________________
746Bool_t AliTRDdigitizer::InitDetector()
747{
748 //
749 // Sets the pointer to the TRD detector and the geometry
750 //
751
dd9a6ee3 752 // Get the pointer to the detector class and check for version 1
753 fTRD = (AliTRD*) gAlice->GetDetector("TRD");
754 if (fTRD->IsVersion() != 1) {
6244debe 755 printf("AliTRDdigitizer::InitDetector -- ");
dd9a6ee3 756 printf("TRD must be version 1 (slow simulator).\n");
757 exit(1);
758 }
759
760 // Get the geometry
761 fGeo = fTRD->GetGeometry();
6244debe 762 printf("AliTRDdigitizer::InitDetector -- ");
dd9a6ee3 763 printf("Geometry version %d\n",fGeo->IsVersion());
764
88fd7ccb 765 // The magnetic field strength in Tesla
766 fField = 0.2 * gAlice->Field()->Factor();
767
872a7aba 768 ReInit();
769
f7336fa3 770 return kTRUE;
771
772}
773
6244debe 774//_____________________________________________________________________________
775Bool_t AliTRDdigitizer::SumSDigits()
776{
777 //
778 // Sums up the summable digits and creates final digits
779 // Not yet implemented
780 //
781
782 return kFALSE;
783
784}
785
f7336fa3 786//_____________________________________________________________________________
787Bool_t AliTRDdigitizer::MakeDigits()
788{
789 //
872a7aba 790 // Creates digits.
f7336fa3 791 //
792
f7336fa3 793 ///////////////////////////////////////////////////////////////
794 // Parameter
795 ///////////////////////////////////////////////////////////////
796
797 // Converts number of electrons to fC
872a7aba 798 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
f7336fa3 799
800 ///////////////////////////////////////////////////////////////
801
793ff80c 802 // Number of pads included in the pad response
803 const Int_t kNpad = 3;
804
805 // Number of track dictionary arrays
dd56b762 806 const Int_t kNDict = AliTRDdigitsManager::kNDict;
793ff80c 807
872a7aba 808 // Half the width of the amplification region
809 const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
810
c3a4830f 811 Int_t iRow, iCol, iTime, iPad;
71d9fa7b 812 Int_t iDict = 0;
793ff80c 813 Int_t nBytes = 0;
f7336fa3 814
815 Int_t totalSizeDigits = 0;
816 Int_t totalSizeDict0 = 0;
817 Int_t totalSizeDict1 = 0;
818 Int_t totalSizeDict2 = 0;
819
872a7aba 820 Int_t timeTRDbeg = 0;
821 Int_t timeTRDend = 1;
822
823 Float_t pos[3];
824 Float_t rot[3];
825 Float_t xyz[3];
826 Float_t padSignal[kNpad];
827 Float_t signalOld[kNpad];
828
793ff80c 829 AliTRDdataArrayF *signals = 0;
830 AliTRDdataArrayI *digits = 0;
8230f242 831 AliTRDdataArrayI *dictionary[kNDict];
da581aea 832
793ff80c 833 // Create a digits manager
834 fDigits = new AliTRDdigitsManager();
835
836 // Create a container for the amplitudes
837 AliTRDsegmentArray *signalsArray
838 = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet());
839
872a7aba 840 if (fTRFOn) {
841 timeTRDbeg = ((Int_t) (-fTRFlo / fGeo->GetTimeBinSize())) - 1;
842 timeTRDend = ((Int_t) ( fTRFhi / fGeo->GetTimeBinSize())) - 1;
da581aea 843 printf("AliTRDdigitizer::MakeDigits -- ");
872a7aba 844 printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
da581aea 845 }
846
872a7aba 847 Float_t elAttachProp = fElAttachProp / 100.;
f7336fa3 848
e153aaf6 849 // Create the sampled PRF
850 SamplePRF();
851
6244debe 852 // Create the sampled TRF
853 SampleTRF();
793ff80c 854
872a7aba 855 if (!fGeo) {
856 printf("AliTRDdigitizer::MakeDigits -- ");
857 printf("No geometry defined\n");
858 return kFALSE;
859 }
860
861 printf("AliTRDdigitizer::MakeDigits -- ");
862 printf("Start creating digits.\n");
863 if (fVerbose > 0) this->Dump();
864
793ff80c 865 // Get the pointer to the hit tree
866 TTree *HitTree = gAlice->TreeH();
867
868 // Get the number of entries in the hit tree
869 // (Number of primary particles creating a hit somewhere)
870 Int_t nTrack = (Int_t) HitTree->GetEntries();
871 if (fVerbose > 0) {
872 printf("AliTRDdigitizer::MakeDigits -- ");
873 printf("Found %d primary particles\n",nTrack);
874 }
875
876 Int_t detectorOld = -1;
877 Int_t countHits = 0;
878
879 // Loop through all entries in the tree
880 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
881
882 gAlice->ResetHits();
883 nBytes += HitTree->GetEvent(iTrack);
884
885 // Get the number of hits in the TRD created by this particle
886 Int_t nHit = fTRD->Hits()->GetEntriesFast();
887 if (fVerbose > 0) {
888 printf("AliTRDdigitizer::MakeDigits -- ");
889 printf("Found %d hits for primary particle %d\n",nHit,iTrack);
890 }
891
892 // Loop through the TRD hits
893 for (Int_t iHit = 0; iHit < nHit; iHit++) {
894
895 countHits++;
896
897 AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
793ff80c 898 pos[0] = hit->X();
899 pos[1] = hit->Y();
900 pos[2] = hit->Z();
901 Float_t q = hit->GetCharge();
902 Int_t track = hit->Track();
903 Int_t detector = hit->GetDetector();
904 Int_t plane = fGeo->GetPlane(detector);
905 Int_t sector = fGeo->GetSector(detector);
906 Int_t chamber = fGeo->GetChamber(detector);
907
908 if (!(CheckDetector(plane,chamber,sector))) continue;
909
910 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
911 Int_t nColMax = fGeo->GetColMax(plane);
912 Int_t nTimeMax = fGeo->GetTimeMax();
872a7aba 913 Int_t nTimeBefore = fGeo->GetTimeBefore();
914 Int_t nTimeAfter = fGeo->GetTimeAfter();
915 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 916 Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
917 Float_t col0 = fGeo->GetCol0(plane);
918 Float_t time0 = fGeo->GetTime0(plane);
71d9fa7b 919 Float_t rowPadSize = fGeo->GetRowPadSize(plane,chamber,sector);
920 Float_t colPadSize = fGeo->GetColPadSize(plane);
793ff80c 921 Float_t timeBinSize = fGeo->GetTimeBinSize();
872a7aba 922 Float_t divideRow = 1.0 / rowPadSize;
923 Float_t divideCol = 1.0 / colPadSize;
924 Float_t divideTime = 1.0 / timeBinSize;
793ff80c 925
926 if (fVerbose > 1) {
927 printf("Analyze hit no. %d ",iHit);
928 printf("-----------------------------------------------------------\n");
929 hit->Dump();
930 printf("plane = %d, sector = %d, chamber = %d\n"
931 ,plane,sector,chamber);
932 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
933 ,nRowMax,nColMax,nTimeMax);
872a7aba 934 printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
935 ,nTimeBefore,nTimeAfter,nTimeTotal);
793ff80c 936 printf("row0 = %f, col0 = %f, time0 = %f\n"
937 ,row0,col0,time0);
c1e4b257 938 printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
939 ,rowPadSize,colPadSize,timeBinSize);
793ff80c 940 }
941
872a7aba 942 // Don't analyze test hits
943 if (hit->FromTest()) continue;
dd56b762 944
793ff80c 945 if (detector != detectorOld) {
e153aaf6 946
793ff80c 947 if (fVerbose > 1) {
948 printf("AliTRDdigitizer::MakeDigits -- ");
949 printf("Get new container. New det = %d, Old det = %d\n"
950 ,detector,detectorOld);
951 }
952 // Compress the old one if enabled
953 if ((fCompress) && (detectorOld > -1)) {
954 if (fVerbose > 1) {
955 printf("AliTRDdigitizer::MakeDigits -- ");
e153aaf6 956 printf("Compress the old container ...");
dd9a6ee3 957 }
793ff80c 958 signals->Compress(1,0);
959 for (iDict = 0; iDict < kNDict; iDict++) {
960 dictionary[iDict]->Compress(1,0);
dd9a6ee3 961 }
793ff80c 962 if (fVerbose > 1) printf("done\n");
9d0b222b 963 }
793ff80c 964 // Get the new container
965 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
966 if (signals->GetNtime() == 0) {
967 // Allocate a new one if not yet existing
968 if (fVerbose > 1) {
969 printf("AliTRDdigitizer::MakeDigits -- ");
970 printf("Allocate a new container ... ");
971 }
872a7aba 972 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 973 }
974 else {
975 // Expand an existing one
c1e4b257 976 if (fCompress) {
977 if (fVerbose > 1) {
978 printf("AliTRDdigitizer::MakeDigits -- ");
979 printf("Expand an existing container ... ");
980 }
981 signals->Expand();
793ff80c 982 }
793ff80c 983 }
984 // The same for the dictionary
985 for (iDict = 0; iDict < kNDict; iDict++) {
986 dictionary[iDict] = fDigits->GetDictionary(detector,iDict);
987 if (dictionary[iDict]->GetNtime() == 0) {
872a7aba 988 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 989 }
990 else {
991 if (fCompress) dictionary[iDict]->Expand();
992 }
993 }
994 if (fVerbose > 1) printf("done\n");
995 detectorOld = detector;
996 }
9d0b222b 997
793ff80c 998 // Rotate the sectors on top of each other
793ff80c 999 fGeo->Rotate(detector,pos,rot);
1000
872a7aba 1001 // The driftlength. It is negative if the hit is in the
1002 // amplification region.
793ff80c 1003 Float_t driftlength = time0 - rot[0];
793ff80c 1004
872a7aba 1005 // Take also the drift in the amplification region into account
1006 // The drift length is at the moment still the same, regardless of
1007 // the position relativ to the wire. This non-isochronity needs still
1008 // to be implemented.
1009 Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
1010 if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
793ff80c 1011
1012 // Loop over all electrons of this hit
1013 // TR photons produce hits with negative charge
1014 Int_t nEl = ((Int_t) TMath::Abs(q));
1015 for (Int_t iEl = 0; iEl < nEl; iEl++) {
1016
793ff80c 1017 xyz[0] = rot[0];
1018 xyz[1] = rot[1];
1019 xyz[2] = rot[2];
1020
1021 // Electron attachment
1022 if (fElAttachOn) {
872a7aba 1023 if (gRandom->Rndm() < (driftlengthL * elAttachProp))
793ff80c 1024 continue;
1025 }
1026
1027 // Apply the diffusion smearing
1028 if (fDiffusionOn) {
1029 if (!(Diffusion(driftlengthL,xyz))) continue;
da581aea 1030 }
f7336fa3 1031
872a7aba 1032 // Apply E x B effects (depends on drift direction)
793ff80c 1033 if (fExBOn) {
872a7aba 1034 if (!(ExB(driftlength+kAmWidth,xyz))) continue;
793ff80c 1035 }
f7336fa3 1036
872a7aba 1037 // The electron position after diffusion and ExB in pad coordinates
793ff80c 1038 // The pad row (z-direction)
872a7aba 1039 Int_t rowE = ((Int_t) ((xyz[2] - row0) * divideRow));
1040 if ((rowE < 0) || (rowE >= nRowMax)) continue;
793ff80c 1041
872a7aba 1042 // The pad column (rphi-direction)
1043 Int_t colE = ((Int_t) ((xyz[1] - col0) * divideCol));
1044 if ((colE < 0) || (colE >= nColMax)) continue;
1045
1046 // The time bin (negative for hits in the amplification region)
1047 // In the amplification region the electrons drift from both sides
1048 // to the middle (anode wire plane)
1049 Float_t timeDist = time0 - xyz[0];
1050 Float_t timeOffset = 0;
1051 Int_t timeE = 0;
1052 if (timeDist > 0) {
1053 // The time bin
1054 timeE = ((Int_t) (timeDist * divideTime));
1055 // The distance of the position to the middle of the timebin
1056 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
1057 }
1058 else {
1059 // Difference between half of the amplification gap width and
1060 // the distance to the anode wire
1061 Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
1062 // The time bin
1063 timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
1064 // The distance of the position to the middle of the timebin
1065 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
1066 }
1067
793ff80c 1068 // Apply the gas gain including fluctuations
1069 Float_t ggRndm = 0.0;
1070 do {
1071 ggRndm = gRandom->Rndm();
1072 } while (ggRndm <= 0);
1073 Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
1074
793ff80c 1075 // Apply the pad response
793ff80c 1076 if (fPRFOn) {
1077 // The distance of the electron to the center of the pad
1078 // in units of pad width
1079 Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize)
872a7aba 1080 * divideCol;
793ff80c 1081 if (!(PadResponse(signal,dist,padSignal))) continue;
1082 }
1083 else {
1084 padSignal[0] = 0.0;
1085 padSignal[1] = signal;
1086 padSignal[2] = 0.0;
1087 }
f7336fa3 1088
872a7aba 1089 // Sample the time response inside the drift region
1090 // + additional time bins before and after.
1091 // The sampling is done always in the middle of the time bin
1092 for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
1093 ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
6244debe 1094 ;iTimeBin++) {
793ff80c 1095
1096 // Apply the time response
1097 Float_t timeResponse = 1.0;
1098 if (fTRFOn) {
1099 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
1100 timeResponse = TimeResponse(time);
1101 }
f7336fa3 1102
872a7aba 1103 signalOld[0] = 0.0;
1104 signalOld[1] = 0.0;
1105 signalOld[2] = 0.0;
1106
c3a4830f 1107 for (iPad = 0; iPad < kNpad; iPad++) {
872a7aba 1108
793ff80c 1109 Int_t colPos = colE + iPad - 1;
1110 if (colPos < 0) continue;
1111 if (colPos >= nColMax) break;
872a7aba 1112
1113 // Add the signals
1114 // Note: The time bin number is shifted by nTimeBefore to avoid negative
db30bf0f 1115 // time bins. This has to be subtracted later.
872a7aba 1116 Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
1117 signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
793ff80c 1118 signalOld[iPad] += padSignal[iPad] * timeResponse;
872a7aba 1119 signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
f7336fa3 1120
872a7aba 1121 // Store the track index in the dictionary
1122 // Note: We store index+1 in order to allow the array to be compressed
1123 if (signalOld[iPad] > 0) {
71d9fa7b 1124 for (iDict = 0; iDict < kNDict; iDict++) {
872a7aba 1125 Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
1126 ,colPos
1127 ,iCurrentTimeBin);
71d9fa7b 1128 if (oldTrack == track+1) break;
71d9fa7b 1129 if (oldTrack == 0) {
872a7aba 1130 dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
71d9fa7b 1131 break;
1132 }
1133 }
793ff80c 1134 }
872a7aba 1135
1136 }
f7336fa3 1137
f7336fa3 1138 }
1139
793ff80c 1140 }
f7336fa3 1141
793ff80c 1142 }
f7336fa3 1143
793ff80c 1144 } // All hits finished
f7336fa3 1145
793ff80c 1146 printf("AliTRDdigitizer::MakeDigits -- ");
1147 printf("Finished analyzing %d hits\n",countHits);
1148
6244debe 1149 // The total conversion factor
1150 Float_t convert = kEl2fC * fPadCoupling * fTimeCoupling * fChipGain;
1151
793ff80c 1152 // Loop through all chambers to finalize the digits
1153 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1154
872a7aba 1155 Int_t plane = fGeo->GetPlane(iDet);
1156 Int_t sector = fGeo->GetSector(iDet);
1157 Int_t chamber = fGeo->GetChamber(iDet);
1158 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1159 Int_t nColMax = fGeo->GetColMax(plane);
1160 Int_t nTimeMax = fGeo->GetTimeMax();
1161 Int_t nTimeTotal = fGeo->GetTimeTotal();
793ff80c 1162
793ff80c 1163 if (fVerbose > 0) {
1164 printf("AliTRDdigitizer::MakeDigits -- ");
1165 printf("Digitization for chamber %d\n",iDet);
1166 }
da581aea 1167
793ff80c 1168 // Add a container for the digits of this detector
1169 digits = fDigits->GetDigits(iDet);
1170 // Allocate memory space for the digits buffer
872a7aba 1171 digits->Allocate(nRowMax,nColMax,nTimeTotal);
da581aea 1172
793ff80c 1173 // Get the signal container
1174 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
1175 if (signals->GetNtime() == 0) {
1176 // Create missing containers
872a7aba 1177 signals->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1178 }
1179 else {
1180 // Expand the container if neccessary
1181 if (fCompress) signals->Expand();
1182 }
1183 // Create the missing dictionary containers
1184 for (iDict = 0; iDict < kNDict; iDict++) {
1185 dictionary[iDict] = fDigits->GetDictionary(iDet,iDict);
1186 if (dictionary[iDict]->GetNtime() == 0) {
872a7aba 1187 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
793ff80c 1188 }
1189 }
f7336fa3 1190
793ff80c 1191 Int_t nDigits = 0;
1192
6244debe 1193 // Don't create noise in detectors that are switched off
1194 if (CheckDetector(plane,chamber,sector)) {
1195
1196 // Create the digits for this chamber
872a7aba 1197 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1198 for (iCol = 0; iCol < nColMax; iCol++ ) {
1199 for (iTime = 0; iTime < nTimeTotal; iTime++) {
6244debe 1200
1201 // Create summable digits
1202 if (fSDigits) {
1203
872a7aba 1204 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
6244debe 1205 Int_t adc = 0;
1206 if (signalAmp >= fSinRange) {
1207 adc = ((Int_t) fSoutRange);
1208 }
1209 else {
1210 adc = ((Int_t) (signalAmp * (fSoutRange / fSinRange)));
1211 }
1212 nDigits++;
872a7aba 1213 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
f7336fa3 1214
c1e4b257 1215 }
6244debe 1216 // Create normal digits
1217 else {
1218
872a7aba 1219 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
6244debe 1220
1221 // Add the noise
1222 signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0);
1223 // Convert to mV
1224 signalAmp *= convert;
1225 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
1226 // signal is larger than fADCinRange
1227 Int_t adc = 0;
1228 if (signalAmp >= fADCinRange) {
1229 adc = ((Int_t) fADCoutRange);
1230 }
1231 else {
1232 adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
1233 }
1234
1235 // Store the amplitude of the digit if above threshold
1236 if (adc > fADCthreshold) {
1237 if (fVerbose > 2) {
1238 printf(" iRow = %d, iCol = %d, iTime = %d\n"
1239 ,iRow,iCol,iTime);
1240 printf(" signal = %f, adc = %d\n",signalAmp,adc);
1241 }
1242 nDigits++;
872a7aba 1243 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
6244debe 1244 }
f7336fa3 1245
6244debe 1246 }
1247
1248 }
1249 }
793ff80c 1250 }
6244debe 1251
793ff80c 1252 }
1253
1254 // Compress the arrays
1255 digits->Compress(1,0);
1256 for (iDict = 0; iDict < kNDict; iDict++) {
1257 dictionary[iDict]->Compress(1,0);
1258 }
f7336fa3 1259
793ff80c 1260 totalSizeDigits += digits->GetSize();
1261 totalSizeDict0 += dictionary[0]->GetSize();
1262 totalSizeDict1 += dictionary[1]->GetSize();
1263 totalSizeDict2 += dictionary[2]->GetSize();
f7336fa3 1264
c1e4b257 1265 Float_t nPixel = nRowMax * nColMax * nTimeMax;
793ff80c 1266 printf("AliTRDdigitizer::MakeDigits -- ");
c1e4b257 1267 printf("Found %d digits in detector %d (%3.0f).\n"
1268 ,nDigits,iDet
1269 ,100.0 * ((Float_t) nDigits) / nPixel);
da581aea 1270
793ff80c 1271 if (fCompress) signals->Compress(1,0);
f7336fa3 1272
f7336fa3 1273 }
1274
da581aea 1275 printf("AliTRDdigitizer::MakeDigits -- ");
8230f242 1276 printf("Total number of analyzed hits = %d\n",countHits);
da581aea 1277
f7336fa3 1278 printf("AliTRDdigitizer::MakeDigits -- ");
1279 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
1280 ,totalSizeDict0
1281 ,totalSizeDict1
1282 ,totalSizeDict2);
1283
1284 return kTRUE;
1285
1286}
1287
16bf9884 1288//_____________________________________________________________________________
1289Bool_t AliTRDdigitizer::Merge(TTree *trees, Int_t *mask, Int_t nin, Int_t event)
1290{
1291 //
1292 // Merges the summable digits of different events
1293 //
1294
1295 return kTRUE;
1296
1297}
1298
793ff80c 1299//_____________________________________________________________________________
1300Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
1301{
1302 //
1303 // Checks whether a detector is enabled
1304 //
1305
1306 if ((fTRD->GetSensChamber() >= 0) &&
1307 (fTRD->GetSensChamber() != chamber)) return kFALSE;
1308 if ((fTRD->GetSensPlane() >= 0) &&
c1e4b257 1309 (fTRD->GetSensPlane() != plane)) return kFALSE;
793ff80c 1310 if ( fTRD->GetSensSector() >= 0) {
1311 Int_t sens1 = fTRD->GetSensSector();
1312 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
1313 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
1314 * AliTRDgeometry::Nsect();
1315 if (sens1 < sens2) {
1316 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
1317 }
1318 else {
1319 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
1320 }
1321 }
1322
1323 return kTRUE;
1324
1325}
1326
f7336fa3 1327//_____________________________________________________________________________
1328Bool_t AliTRDdigitizer::WriteDigits()
1329{
1330 //
1331 // Writes out the TRD-digits and the dictionaries
1332 //
1333
1334 // Create the branches
1335 if (!(gAlice->TreeD()->GetBranch("TRDdigits"))) {
6244debe 1336 return kFALSE;
f7336fa3 1337 }
1338
da581aea 1339 // Store the digits and the dictionary in the tree
1340 fDigits->WriteDigits();
f7336fa3 1341
1342 // Write the new tree into the input file (use overwrite option)
71d9fa7b 1343 Char_t treeName[15];
f7336fa3 1344 sprintf(treeName,"TreeD%d",fEvent);
1345 printf("AliTRDdigitizer::WriteDigits -- ");
1346 printf("Write the digits tree %s for event %d.\n"
1347 ,treeName,fEvent);
2ab0c725 1348 gAlice->TreeD()->Write(treeName,TObject::kOverwrite);
f7336fa3 1349
1350 return kTRUE;
1351
1352}
793ff80c 1353
1354//_____________________________________________________________________________
db30bf0f 1355Float_t AliTRDdigitizer::GetDiffusionL(Float_t vd, Float_t b)
793ff80c 1356{
1357 //
db30bf0f 1358 // Returns the longitudinal diffusion coefficient for a given drift
1359 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1360 // The values are according to a GARFIELD simulation.
793ff80c 1361 //
1362
db30bf0f 1363 const Int_t kNb = 5;
1364 Float_t p0[kNb] = { 0.007440, 0.007493, 0.007513, 0.007672, 0.007831 };
1365 Float_t p1[kNb] = { 0.019252, 0.018912, 0.018636, 0.018012, 0.017343 };
1366 Float_t p2[kNb] = { -0.005042, -0.004926, -0.004867, -0.004650, -0.004424 };
1367 Float_t p3[kNb] = { 0.000195, 0.000189, 0.000195, 0.000182, 0.000169 };
1368
1369 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1370 ib = TMath::Max( 0,ib);
1371 ib = TMath::Min(kNb,ib);
1372
1373 Float_t diff = p0[ib]
1374 + p1[ib] * vd
1375 + p2[ib] * vd*vd
1376 + p3[ib] * vd*vd*vd;
1377
1378 return diff;
1379
1380}
1381
1382//_____________________________________________________________________________
1383Float_t AliTRDdigitizer::GetDiffusionT(Float_t vd, Float_t b)
1384{
1385 //
1386 // Returns the transverse diffusion coefficient for a given drift
1387 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1388 // The values are according to a GARFIELD simulation.
1389 //
1390
1391 const Int_t kNb = 5;
1392 Float_t p0[kNb] = { 0.009550, 0.009599, 0.009674, 0.009757, 0.009850 };
1393 Float_t p1[kNb] = { 0.006667, 0.006539, 0.006359, 0.006153, 0.005925 };
1394 Float_t p2[kNb] = { -0.000853, -0.000798, -0.000721, -0.000635, -0.000541 };
1395 Float_t p3[kNb] = { 0.000131, 0.000122, 0.000111, 0.000098, 0.000085 };
1396
1397 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1398 ib = TMath::Max( 0,ib);
1399 ib = TMath::Min(kNb,ib);
1400
1401 Float_t diff = p0[ib]
1402 + p1[ib] * vd
1403 + p2[ib] * vd*vd
1404 + p3[ib] * vd*vd*vd;
1405
1406 return diff;
1407
1408}
1409
1410//_____________________________________________________________________________
1411Float_t AliTRDdigitizer::GetOmegaTau(Float_t vd, Float_t b)
1412{
1413 //
1414 // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
1415 // and a B-field <b> for Xe/CO2 (15%).
1416 // The values are according to a GARFIELD simulation.
1417 //
1418
1419 const Int_t kNb = 5;
1420 Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
1421 Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
1422 Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
1423 Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
1424
1425 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1426 ib = TMath::Max( 0,ib);
1427 ib = TMath::Min(kNb,ib);
1428
1429 Float_t alphaL = p0[ib]
1430 + p1[ib] * vd
1431 + p2[ib] * vd*vd
1432 + p3[ib] * vd*vd*vd;
1433
1434 return TMath::Tan(alphaL);
793ff80c 1435
1436}
1437