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[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$Log$
793ff80c 18Revision 1.1.4.9 2000/10/26 17:00:22 cblume
19Fixed bug in CheckDetector()
20
21Revision 1.1.4.8 2000/10/23 13:41:35 cblume
22Added protection against Log(0) in the gas gain calulation
23
24Revision 1.1.4.7 2000/10/17 02:27:34 cblume
25Get rid of global constants
26
27Revision 1.1.4.6 2000/10/16 01:16:53 cblume
28Changed timebin 0 to be the one closest to the readout
29
30Revision 1.1.4.5 2000/10/15 23:34:29 cblume
31Faster version of the digitizer
32
33Revision 1.1.4.4 2000/10/06 16:49:46 cblume
34Made Getters const
35
36Revision 1.1.4.3 2000/10/04 16:34:58 cblume
37Replace include files by forward declarations
38
39Revision 1.1.4.2 2000/09/22 14:41:10 cblume
40Bug fix in PRF. Included time response. New structure
41
eda4336d 42Revision 1.10 2000/10/05 07:27:53 cblume
43Changes in the header-files by FCA
44
6798b56e 45Revision 1.9 2000/10/02 21:28:19 fca
46Removal of useless dependecies via forward declarations
47
94de3818 48Revision 1.8 2000/06/09 11:10:07 cblume
49Compiler warnings and coding conventions, next round
50
dd9a6ee3 51Revision 1.7 2000/06/08 18:32:58 cblume
52Make code compliant to coding conventions
53
8230f242 54Revision 1.6 2000/06/07 16:27:32 cblume
55Try to remove compiler warnings on Sun and HP
56
9d0b222b 57Revision 1.5 2000/05/09 16:38:57 cblume
58Removed PadResponse(). Merge problem
59
f0a7bf65 60Revision 1.4 2000/05/08 15:53:45 cblume
61Resolved merge conflict
62
da581aea 63Revision 1.3 2000/04/28 14:49:27 cblume
64Only one declaration of iDict in MakeDigits()
65
66Revision 1.1.4.1 2000/05/08 14:42:04 cblume
67Introduced AliTRDdigitsManager
28329a48 68
1befd3b2 69Revision 1.1 2000/02/28 19:00:13 cblume
70Add new TRD classes
71
f7336fa3 72*/
73
74///////////////////////////////////////////////////////////////////////////////
75// //
76// Creates and handles digits from TRD hits //
77// //
78// The following effects are included: //
79// - Diffusion //
80// - ExB effects //
81// - Gas gain including fluctuations //
82// - Pad-response (simple Gaussian approximation) //
83// - Electronics noise //
84// - Electronics gain //
85// - Digitization //
86// - ADC threshold //
87// The corresponding parameter can be adjusted via the various //
88// Set-functions. If these parameters are not explicitly set, default //
89// values are used (see Init-function). //
90// To produce digits from a root-file with TRD-hits use the //
91// slowDigitsCreate.C macro. //
92// //
93///////////////////////////////////////////////////////////////////////////////
94
6798b56e 95#include <stdlib.h>
96
f7336fa3 97#include <TMath.h>
98#include <TVector.h>
99#include <TRandom.h>
94de3818 100#include <TROOT.h>
101#include <TTree.h>
793ff80c 102#include <TFile.h>
103#include <TF1.h>
104
105#include "AliRun.h"
f7336fa3 106
107#include "AliTRD.h"
793ff80c 108#include "AliTRDhit.h"
f7336fa3 109#include "AliTRDdigitizer.h"
da581aea 110#include "AliTRDdataArrayI.h"
111#include "AliTRDdataArrayF.h"
793ff80c 112#include "AliTRDsegmentArray.h"
da581aea 113#include "AliTRDdigitsManager.h"
793ff80c 114#include "AliTRDgeometry.h"
f7336fa3 115
116ClassImp(AliTRDdigitizer)
117
118//_____________________________________________________________________________
119AliTRDdigitizer::AliTRDdigitizer():TNamed()
120{
121 //
122 // AliTRDdigitizer default constructor
123 //
124
da581aea 125 fInputFile = NULL;
126 fDigits = NULL;
127 fTRD = NULL;
128 fGeo = NULL;
129 fPRF = NULL;
793ff80c 130 fTRF = NULL;
131 fTRFint = NULL;
da581aea 132
133 fEvent = 0;
134 fGasGain = 0.0;
135 fNoise = 0.0;
136 fChipGain = 0.0;
137 fADCoutRange = 0.0;
138 fADCinRange = 0.0;
139 fADCthreshold = 0;
140 fDiffusionOn = 0;
141 fDiffusionT = 0.0;
142 fDiffusionL = 0.0;
143 fElAttachOn = 0;
144 fElAttachProp = 0.0;
145 fExBOn = 0;
793ff80c 146 fOmegaTau = 0.0;
147 fPRFOn = 0;
148 fTRFOn = 0;
149 fDriftVelocity = 0.0;
150
151 fTRFbin = 0;
152 fTRFlo = 0.0;
153 fTRFhi = 0.0;
154 fTRFwid = 0.0;
155 fCompress = kFALSE;
156 fVerbose = 1;
f7336fa3 157
158}
159
160//_____________________________________________________________________________
161AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
162 :TNamed(name,title)
163{
164 //
165 // AliTRDdigitizer default constructor
166 //
167
da581aea 168 fInputFile = NULL;
169 fDigits = NULL;
170 fTRD = NULL;
171 fGeo = NULL;
f7336fa3 172
da581aea 173 fEvent = 0;
f7336fa3 174
793ff80c 175 fCompress = kTRUE;
176 fVerbose = 1;
177
f7336fa3 178 Init();
179
180}
181
182//_____________________________________________________________________________
dd9a6ee3 183AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
8230f242 184{
185 //
186 // AliTRDdigitizer copy constructor
187 //
188
dd9a6ee3 189 ((AliTRDdigitizer &) d).Copy(*this);
8230f242 190
191}
192
193//_____________________________________________________________________________
f7336fa3 194AliTRDdigitizer::~AliTRDdigitizer()
195{
8230f242 196 //
197 // AliTRDdigitizer destructor
198 //
f7336fa3 199
200 if (fInputFile) {
201 fInputFile->Close();
202 delete fInputFile;
203 }
204
da581aea 205 if (fDigits) {
206 delete fDigits;
f7336fa3 207 }
208
da581aea 209 if (fPRF) delete fPRF;
793ff80c 210 if (fTRF) delete fTRF;
f7336fa3 211
212}
213
214//_____________________________________________________________________________
dd9a6ee3 215AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
216{
217 //
218 // Assignment operator
219 //
220
221 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
222 return *this;
223
224}
225
226//_____________________________________________________________________________
227void AliTRDdigitizer::Copy(TObject &d)
8230f242 228{
229 //
230 // Copy function
231 //
232
dd9a6ee3 233 ((AliTRDdigitizer &) d).fInputFile = NULL;
234 ((AliTRDdigitizer &) d).fDigits = NULL;
235 ((AliTRDdigitizer &) d).fTRD = NULL;
236 ((AliTRDdigitizer &) d).fGeo = NULL;
237
238 ((AliTRDdigitizer &) d).fEvent = 0;
239
240 ((AliTRDdigitizer &) d).fGasGain = fGasGain;
241 ((AliTRDdigitizer &) d).fNoise = fNoise;
242 ((AliTRDdigitizer &) d).fChipGain = fChipGain;
243 ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
244 ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
245 ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
246 ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
247 ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
248 ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
249 ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
250 ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
251 ((AliTRDdigitizer &) d).fExBOn = fExBOn;
793ff80c 252 ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
dd9a6ee3 253 ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
793ff80c 254 ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
255 ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
256
257 ((AliTRDdigitizer &) d).fCompress = fCompress;
258 ((AliTRDdigitizer &) d).fVerbose = fVerbose;
dd9a6ee3 259
260 fPRF->Copy(*((AliTRDdigitizer &) d).fPRF);
793ff80c 261 fTRF->Copy(*((AliTRDdigitizer &) d).fTRF);
262
263 ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
264 ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
265 ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
266 ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
267 if (((AliTRDdigitizer &) d).fTRFint) delete ((AliTRDdigitizer &) d).fTRFint;
268 ((AliTRDdigitizer &) d).fTRFint = new Float_t[fTRFbin];
269 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
270 ((AliTRDdigitizer &) d).fTRFint[iBin] = fTRFint[iBin];
271 }
8230f242 272
273}
274
275//_____________________________________________________________________________
f7336fa3 276Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz)
277{
278 //
279 // Applies the diffusion smearing to the position of a single electron
280 //
281
282 Float_t driftSqrt = TMath::Sqrt(driftlength);
283 Float_t sigmaT = driftSqrt * fDiffusionT;
284 Float_t sigmaL = driftSqrt * fDiffusionL;
285 xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
286 xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
287 xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
793ff80c 288
f7336fa3 289 return 1;
290
291}
292
293//_____________________________________________________________________________
294Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz)
295{
296 //
297 // Applies E x B effects to the position of a single electron
298 //
299
300 xyz[0] = xyz[0];
793ff80c 301 xyz[1] = xyz[1] + fOmegaTau * driftlength;
f7336fa3 302 xyz[2] = xyz[2];
303
304 return 1;
305
306}
307
308//_____________________________________________________________________________
793ff80c 309Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad)
310{
311 //
312 // Applies the pad response
313 //
314
315 if (fPRF) {
316 pad[0] = TMath::Max(fPRF->Eval(-1.0 - dist,0,0) * signal,0.0);
317 pad[1] = TMath::Max(fPRF->Eval( - dist,0,0) * signal,0.0);
318 pad[2] = TMath::Max(fPRF->Eval( 1.0 - dist,0,0) * signal,0.0);
319 return 1;
320 }
321 else {
322 return 0;
323 }
324
325}
326
327//_____________________________________________________________________________
328Float_t AliTRDdigitizer::TimeResponse(Float_t time)
329{
330 //
331 // Applies the preamp shaper time response
332 //
333
334 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
335 if ((iBin >= 0) && (iBin < fTRFbin)) {
336 return fTRFint[iBin];
337 }
338 else {
339 return 0.0;
340 }
341
342}
343
344//_____________________________________________________________________________
f7336fa3 345void AliTRDdigitizer::Init()
346{
347 //
348 // Initializes the digitization procedure with standard values
349 //
350
351 // The default parameter for the digitization
793ff80c 352 fGasGain = 8.0E3;
f7336fa3 353 fNoise = 3000.;
354 fChipGain = 10.;
355 fADCoutRange = 255.;
356 fADCinRange = 2000.;
357 fADCthreshold = 1;
358
359 // Transverse and longitudinal diffusion coefficients (Xe/Isobutane)
360 fDiffusionOn = 1;
361 fDiffusionT = 0.060;
362 fDiffusionL = 0.017;
363
364 // Propability for electron attachment
365 fElAttachOn = 0;
366 fElAttachProp = 0.0;
367
368 // E x B effects
369 fExBOn = 0;
370 // omega * tau. (tau ~ 12 * 10^-12, B = 0.2T)
793ff80c 371 fOmegaTau = 17.6 * 12.0 * 0.2 * 0.01;
f7336fa3 372
da581aea 373 // The pad response function
793ff80c 374 fPRFOn = 1;
375 fPRF = new TF1("PRF","[0]*([1]+exp(-x*x/(2.0*[2])))",-3,3);
da581aea 376 fPRF->SetParameter(0, 0.8872);
377 fPRF->SetParameter(1,-0.00573);
378 fPRF->SetParameter(2, 0.454 * 0.454);
379
793ff80c 380 // The drift velocity (cm / mus)
381 fDriftVelocity = 1.0;
382
383 // The time response function
384 fTRFOn = 1;
385 Float_t loTRF = -200.0;
386 Float_t hiTRF = 1000.0;
387 fTRF = new TF1("TRF",TRFlandau,loTRF,hiTRF,3);
388 fTRF->SetParameter(0, 1.0 / 24.24249);
389 fTRF->SetParameter(1, 0.0);
390 fTRF->SetParameter(2, 25.0);
391 fTRFbin = 1200;
392 fTRFlo = loTRF * fDriftVelocity / 1000.0;
393 fTRFhi = hiTRF * fDriftVelocity / 1000.0;
394 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
395
396}
397
398//_____________________________________________________________________________
399void AliTRDdigitizer::IntegrateTRF()
400{
401 //
402 // Integrates the time response function over the time bin size
403 //
404
405 if (fTRFint) delete fTRFint;
406 fTRFint = new Float_t[fTRFbin];
407 Float_t hiTRF = fTRFhi / fDriftVelocity * 1000.0;
408 Float_t loTRF = fTRFlo / fDriftVelocity * 1000.0;
409 Float_t timeBin = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
410 Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
411 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
412 Float_t bin = iBin * binWidth + loTRF - 0.5 * timeBin;
413 fTRFint[iBin] = fTRF->Integral(bin,bin + timeBin);
414 }
415
f7336fa3 416}
417
418//_____________________________________________________________________________
419Bool_t AliTRDdigitizer::Open(const Char_t *name, Int_t nEvent)
420{
421 //
422 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
423 //
424
425 // Connect the AliRoot file containing Geometry, Kine, and Hits
426 fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(name);
427 if (!fInputFile) {
428 printf("AliTRDdigitizer::Open -- ");
429 printf("Open the ALIROOT-file %s.\n",name);
430 fInputFile = new TFile(name,"UPDATE");
431 }
432 else {
433 printf("AliTRDdigitizer::Open -- ");
434 printf("%s is already open.\n",name);
435 }
436
da581aea 437 gAlice = (AliRun*) fInputFile->Get("gAlice");
438 if (gAlice) {
439 printf("AliTRDdigitizer::Open -- ");
440 printf("AliRun object found on file.\n");
441 }
442 else {
443 printf("AliTRDdigitizer::Open -- ");
444 printf("Could not find AliRun object.\n");
445 return kFALSE;
446 }
f7336fa3 447
448 fEvent = nEvent;
449
450 // Import the Trees for the event nEvent in the file
451 Int_t nparticles = gAlice->GetEvent(fEvent);
452 if (nparticles <= 0) {
453 printf("AliTRDdigitizer::Open -- ");
454 printf("No entries in the trees for event %d.\n",fEvent);
455 return kFALSE;
456 }
457
793ff80c 458 return InitDetector();
459
460}
461
462//_____________________________________________________________________________
463Bool_t AliTRDdigitizer::InitDetector()
464{
465 //
466 // Sets the pointer to the TRD detector and the geometry
467 //
468
dd9a6ee3 469 // Get the pointer to the detector class and check for version 1
470 fTRD = (AliTRD*) gAlice->GetDetector("TRD");
471 if (fTRD->IsVersion() != 1) {
472 printf("AliTRDdigitizer::Open -- ");
473 printf("TRD must be version 1 (slow simulator).\n");
474 exit(1);
475 }
476
477 // Get the geometry
478 fGeo = fTRD->GetGeometry();
479 printf("AliTRDdigitizer::Open -- ");
480 printf("Geometry version %d\n",fGeo->IsVersion());
481
f7336fa3 482 return kTRUE;
483
484}
485
486//_____________________________________________________________________________
f7336fa3 487Bool_t AliTRDdigitizer::MakeDigits()
488{
489 //
490 // Loops through the TRD-hits and creates the digits.
491 //
492
f7336fa3 493 ///////////////////////////////////////////////////////////////
494 // Parameter
495 ///////////////////////////////////////////////////////////////
496
497 // Converts number of electrons to fC
8230f242 498 const Float_t kEl2fC = 1.602E-19 * 1.0E15;
f7336fa3 499
500 ///////////////////////////////////////////////////////////////
501
793ff80c 502 // Number of pads included in the pad response
503 const Int_t kNpad = 3;
504
505 // Number of track dictionary arrays
506 const Int_t kNDict = AliTRDdigitsManager::NDict();
507
f7336fa3 508 Int_t iRow, iCol, iTime;
28329a48 509 Int_t iDict;
793ff80c 510 Int_t nBytes = 0;
f7336fa3 511
512 Int_t totalSizeDigits = 0;
513 Int_t totalSizeDict0 = 0;
514 Int_t totalSizeDict1 = 0;
515 Int_t totalSizeDict2 = 0;
516
793ff80c 517 AliTRDdataArrayF *signals = 0;
518 AliTRDdataArrayI *digits = 0;
8230f242 519 AliTRDdataArrayI *dictionary[kNDict];
da581aea 520
793ff80c 521 // Create a digits manager
522 fDigits = new AliTRDdigitsManager();
523
524 // Create a container for the amplitudes
525 AliTRDsegmentArray *signalsArray
526 = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet());
527
da581aea 528 if (!fGeo) {
529 printf("AliTRDdigitizer::MakeDigits -- ");
530 printf("No geometry defined\n");
531 return kFALSE;
532 }
533
da581aea 534 printf("AliTRDdigitizer::MakeDigits -- ");
535 printf("Start creating digits.\n");
793ff80c 536 if (fVerbose > 0) this->Dump();
f7336fa3 537
538 // The Lorentz factor
539 if (fExBOn) {
793ff80c 540 fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
f7336fa3 541 }
542 else {
543 fLorentzFactor = 1.0;
544 }
545
793ff80c 546 // Create the integrated TRF
547 IntegrateTRF();
548
549 // Get the pointer to the hit tree
550 TTree *HitTree = gAlice->TreeH();
551
552 // Get the number of entries in the hit tree
553 // (Number of primary particles creating a hit somewhere)
554 Int_t nTrack = (Int_t) HitTree->GetEntries();
555 if (fVerbose > 0) {
556 printf("AliTRDdigitizer::MakeDigits -- ");
557 printf("Found %d primary particles\n",nTrack);
558 }
559
560 Int_t detectorOld = -1;
561 Int_t countHits = 0;
562
563 // Loop through all entries in the tree
564 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
565
566 gAlice->ResetHits();
567 nBytes += HitTree->GetEvent(iTrack);
568
569 // Get the number of hits in the TRD created by this particle
570 Int_t nHit = fTRD->Hits()->GetEntriesFast();
571 if (fVerbose > 0) {
572 printf("AliTRDdigitizer::MakeDigits -- ");
573 printf("Found %d hits for primary particle %d\n",nHit,iTrack);
574 }
575
576 // Loop through the TRD hits
577 for (Int_t iHit = 0; iHit < nHit; iHit++) {
578
579 countHits++;
580
581 AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
582 Float_t pos[3];
583 pos[0] = hit->X();
584 pos[1] = hit->Y();
585 pos[2] = hit->Z();
586 Float_t q = hit->GetCharge();
587 Int_t track = hit->Track();
588 Int_t detector = hit->GetDetector();
589 Int_t plane = fGeo->GetPlane(detector);
590 Int_t sector = fGeo->GetSector(detector);
591 Int_t chamber = fGeo->GetChamber(detector);
592
593 if (!(CheckDetector(plane,chamber,sector))) continue;
594
595 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
596 Int_t nColMax = fGeo->GetColMax(plane);
597 Int_t nTimeMax = fGeo->GetTimeMax();
598 Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
599 Float_t col0 = fGeo->GetCol0(plane);
600 Float_t time0 = fGeo->GetTime0(plane);
601 Float_t rowPadSize = fGeo->GetRowPadSize();
602 Float_t colPadSize = fGeo->GetColPadSize();
603 Float_t timeBinSize = fGeo->GetTimeBinSize();
604
605 if (fVerbose > 1) {
606 printf("Analyze hit no. %d ",iHit);
607 printf("-----------------------------------------------------------\n");
608 hit->Dump();
609 printf("plane = %d, sector = %d, chamber = %d\n"
610 ,plane,sector,chamber);
611 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
612 ,nRowMax,nColMax,nTimeMax);
613 printf("row0 = %f, col0 = %f, time0 = %f\n"
614 ,row0,col0,time0);
615 }
616
617 // Get different container if the detector has changed
618 if (detector != detectorOld) {
619 if (fVerbose > 1) {
620 printf("AliTRDdigitizer::MakeDigits -- ");
621 printf("Get new container. New det = %d, Old det = %d\n"
622 ,detector,detectorOld);
623 }
624 // Compress the old one if enabled
625 if ((fCompress) && (detectorOld > -1)) {
626 if (fVerbose > 1) {
627 printf("AliTRDdigitizer::MakeDigits -- ");
628 printf("Compress the old container ... ");
dd9a6ee3 629 }
793ff80c 630 signals->Compress(1,0);
631 for (iDict = 0; iDict < kNDict; iDict++) {
632 dictionary[iDict]->Compress(1,0);
dd9a6ee3 633 }
793ff80c 634 if (fVerbose > 1) printf("done\n");
9d0b222b 635 }
793ff80c 636 // Get the new container
637 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
638 if (signals->GetNtime() == 0) {
639 // Allocate a new one if not yet existing
640 if (fVerbose > 1) {
641 printf("AliTRDdigitizer::MakeDigits -- ");
642 printf("Allocate a new container ... ");
643 }
644 signals->Allocate(nRowMax,nColMax,nTimeMax);
645 }
646 else {
647 // Expand an existing one
648 if (fVerbose > 1) {
649 printf("AliTRDdigitizer::MakeDigits -- ");
650 printf("Expand an existing container ... ");
651 }
652 if (fCompress) signals->Expand();
653 }
654 // The same for the dictionary
655 for (iDict = 0; iDict < kNDict; iDict++) {
656 dictionary[iDict] = fDigits->GetDictionary(detector,iDict);
657 if (dictionary[iDict]->GetNtime() == 0) {
658 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeMax);
659 }
660 else {
661 if (fCompress) dictionary[iDict]->Expand();
662 }
663 }
664 if (fVerbose > 1) printf("done\n");
665 detectorOld = detector;
666 }
9d0b222b 667
793ff80c 668 // Rotate the sectors on top of each other
669 Float_t rot[3];
670 fGeo->Rotate(detector,pos,rot);
671
672 // The driftlength
673 Float_t driftlength = time0 - rot[0];
674 if ((driftlength < 0) ||
675 (driftlength > AliTRDgeometry::DrThick())) break;
676 Float_t driftlengthL = driftlength;
677 if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
678
679 // The hit position in pad coordinates (center pad)
680 // The pad row (z-direction)
681 Int_t rowH = (Int_t) ((rot[2] - row0) / rowPadSize);
682 // The pad column (rphi-direction)
683 Int_t colH = (Int_t) ((rot[1] - col0) / colPadSize);
684 // The time bucket
685 Int_t timeH = (Int_t) (driftlength / timeBinSize);
686 if (fVerbose > 1) {
687 printf("rowH = %d, colH = %d, timeH = %d\n"
688 ,rowH,colH,timeH);
689 }
690
691 // Loop over all electrons of this hit
692 // TR photons produce hits with negative charge
693 Int_t nEl = ((Int_t) TMath::Abs(q));
694 for (Int_t iEl = 0; iEl < nEl; iEl++) {
695
696 Float_t xyz[3];
697 xyz[0] = rot[0];
698 xyz[1] = rot[1];
699 xyz[2] = rot[2];
700
701 // Electron attachment
702 if (fElAttachOn) {
703 if (gRandom->Rndm() < (driftlengthL * fElAttachProp / 100.))
704 continue;
705 }
706
707 // Apply the diffusion smearing
708 if (fDiffusionOn) {
709 if (!(Diffusion(driftlengthL,xyz))) continue;
da581aea 710 }
f7336fa3 711
793ff80c 712 // Apply E x B effects
713 if (fExBOn) {
714 if (!(ExB(driftlength,xyz))) continue;
715 }
f7336fa3 716
793ff80c 717 // The electron position
718 // The pad row (z-direction)
719 Int_t rowE = (Int_t) ((xyz[2] - row0) / rowPadSize);
720 // The pad column (rphi-direction)
721 Int_t colE = (Int_t) ((xyz[1] - col0) / colPadSize);
722 // The time bucket
723 Int_t timeE = (Int_t) ((time0 - xyz[0]) / timeBinSize);
724
725 if (( rowE < 0) || ( rowE >= nRowMax)) continue;
726 if (( colE < 0) || ( colE >= nColMax)) continue;
727 if ((timeE < 0) || (timeE >= nTimeMax)) continue;
728
729 // Apply the gas gain including fluctuations
730 Float_t ggRndm = 0.0;
731 do {
732 ggRndm = gRandom->Rndm();
733 } while (ggRndm <= 0);
734 Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
735
736 if (fVerbose > 2) {
737 printf(" electron no. %d, signal = %d\n",iEl,signal);
738 printf(" rowE = %d, colE = %d, timeE = %d\n"
739 ,rowE,colE,timeE);
740 }
f7336fa3 741
793ff80c 742 // Apply the pad response
743 Float_t padSignal[kNpad];
744 if (fPRFOn) {
745 // The distance of the electron to the center of the pad
746 // in units of pad width
747 Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize)
748 / colPadSize;
749 if (!(PadResponse(signal,dist,padSignal))) continue;
750 }
751 else {
752 padSignal[0] = 0.0;
753 padSignal[1] = signal;
754 padSignal[2] = 0.0;
755 }
f7336fa3 756
793ff80c 757 // The distance of the position to the beginning of the timebin
758 Float_t timeOffset = (time0 - timeE * timeBinSize) - xyz[0];
759 Int_t timeTRDbeg = 0;
760 Int_t timeTRDend = 1;
761 if (fTRFOn) {
762 timeTRDbeg = 2;
763 timeTRDend = 11;
764 }
765 for (Int_t iTimeBin = TMath::Max(timeE - timeTRDbeg, 0)
766 ; iTimeBin < TMath::Min(timeE + timeTRDend,nTimeMax)
767 ; iTimeBin++) {
768
769 // Apply the time response
770 Float_t timeResponse = 1.0;
771 if (fTRFOn) {
772 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
773 timeResponse = TimeResponse(time);
774 }
f7336fa3 775
793ff80c 776 // Add the signals
777 Float_t signalOld[kNpad] = { 0.0, 0.0, 0.0 };
778 for (Int_t iPad = 0; iPad < kNpad; iPad++) {
779 Int_t colPos = colE + iPad - 1;
780 if (colPos < 0) continue;
781 if (colPos >= nColMax) break;
782 signalOld[iPad] = signals->GetData(rowE,colPos,iTimeBin);
783 signalOld[iPad] += padSignal[iPad] * timeResponse;
784 signals->SetData(rowE,colPos,iTimeBin,signalOld[iPad]);
785 }
786 if (fVerbose > 3) {
787 printf(" iTimeBin = %d, timeResponse = %f\n"
788 ,iTimeBin,timeResponse);
789 printf(" pad-signal = %f, %f, %f\n"
790 ,signalOld[0],signalOld[1],signalOld[2]);
791 }
f7336fa3 792
793ff80c 793 // Store the track index in the dictionary
794 // Note: We store index+1 in order to allow the array to be compressed
795 for (iDict = 0; iDict < kNDict; iDict++) {
796 Int_t oldTrack = dictionary[iDict]->GetData(rowE,colE,timeE);
797 if (oldTrack == track+1) break;
798 //if (oldTrack == -1) break;
799 if (oldTrack == 0) {
800 dictionary[iDict]->SetData(rowE,colE,timeE,track+1);
801 if (fVerbose > 3) {
802 printf(" track index = %d\n",track);
f7336fa3 803 }
793ff80c 804 break;
805 }
806 }
807 if ((fVerbose > 1) && (iDict == kNDict)) {
808 printf("AliTRDdigitizer::MakeDigits -- ");
809 printf("More than three tracks for one digit!\n");
f7336fa3 810 }
811
f7336fa3 812 }
813
793ff80c 814 }
f7336fa3 815
793ff80c 816 }
f7336fa3 817
793ff80c 818 } // All hits finished
f7336fa3 819
793ff80c 820 printf("AliTRDdigitizer::MakeDigits -- ");
821 printf("Finished analyzing %d hits\n",countHits);
822
823 // Loop through all chambers to finalize the digits
824 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
825
826 Int_t plane = fGeo->GetPlane(iDet);
827 Int_t sector = fGeo->GetSector(iDet);
828 Int_t chamber = fGeo->GetChamber(iDet);
829 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
830 Int_t nColMax = fGeo->GetColMax(plane);
831 Int_t nTimeMax = fGeo->GetTimeMax();
832
833 if (!(CheckDetector(plane,chamber,sector))) continue;
834 if (fVerbose > 0) {
835 printf("AliTRDdigitizer::MakeDigits -- ");
836 printf("Digitization for chamber %d\n",iDet);
837 }
da581aea 838
793ff80c 839 // Add a container for the digits of this detector
840 digits = fDigits->GetDigits(iDet);
841 // Allocate memory space for the digits buffer
842 digits->Allocate(nRowMax,nColMax,nTimeMax);
da581aea 843
793ff80c 844 // Get the signal container
845 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
846 if (signals->GetNtime() == 0) {
847 // Create missing containers
848 signals->Allocate(nRowMax,nColMax,nTimeMax);
849 }
850 else {
851 // Expand the container if neccessary
852 if (fCompress) signals->Expand();
853 }
854 // Create the missing dictionary containers
855 for (iDict = 0; iDict < kNDict; iDict++) {
856 dictionary[iDict] = fDigits->GetDictionary(iDet,iDict);
857 if (dictionary[iDict]->GetNtime() == 0) {
858 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeMax);
859 }
860 }
f7336fa3 861
793ff80c 862 Int_t nDigits = 0;
863
864 // Create the digits for this chamber
865 for (iRow = 0; iRow < nRowMax; iRow++ ) {
866 for (iCol = 0; iCol < nColMax; iCol++ ) {
867 for (iTime = 0; iTime < nTimeMax; iTime++) {
868
869 Float_t signalAmp = signals->GetData(iRow,iCol,iTime);
870
871 // Add the noise
872 signalAmp = TMath::Max((Float_t) gRandom->Gaus(signalAmp,fNoise),0.0);
873 // Convert to fC
874 signalAmp *= kEl2fC;
875 // Convert to mV
876 signalAmp *= fChipGain;
877 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
878 // signal is larger than fADCinRange
879 Int_t adc = 0;
880 if (signalAmp >= fADCinRange) {
881 adc = ((Int_t) fADCoutRange);
882 }
883 else {
884 adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
885 }
886 if (fVerbose > 2) {
887 printf(" iRow = %d, iCol = %d, iTime = %d\n"
888 ,iRow,iCol,iTime);
889 printf(" signal = %f, adc = %d\n",signalAmp,adc);
890 }
f7336fa3 891
793ff80c 892 // Store the amplitude of the digit if above threshold
893 if (adc > fADCthreshold) {
894 nDigits++;
895 digits->SetData(iRow,iCol,iTime,adc);
f7336fa3 896 }
f7336fa3 897
f7336fa3 898 }
793ff80c 899 }
900 }
901
902 // Compress the arrays
903 digits->Compress(1,0);
904 for (iDict = 0; iDict < kNDict; iDict++) {
905 dictionary[iDict]->Compress(1,0);
906 }
f7336fa3 907
793ff80c 908 totalSizeDigits += digits->GetSize();
909 totalSizeDict0 += dictionary[0]->GetSize();
910 totalSizeDict1 += dictionary[1]->GetSize();
911 totalSizeDict2 += dictionary[2]->GetSize();
f7336fa3 912
793ff80c 913 printf("AliTRDdigitizer::MakeDigits -- ");
914 printf("Found %d digits in detector %d.\n",nDigits,iDet);
da581aea 915
793ff80c 916 if (fCompress) signals->Compress(1,0);
f7336fa3 917
f7336fa3 918 }
919
920 printf("AliTRDdigitizer::MakeDigits -- ");
8230f242 921 printf("Total number of analyzed hits = %d\n",countHits);
da581aea 922
923 printf("AliTRDdigitizer::MakeDigits -- ");
f7336fa3 924 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
925 ,totalSizeDict0
926 ,totalSizeDict1
927 ,totalSizeDict2);
928
929 return kTRUE;
930
931}
932
933//_____________________________________________________________________________
793ff80c 934Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
935{
936 //
937 // Checks whether a detector is enabled
938 //
939
940 if ((fTRD->GetSensChamber() >= 0) &&
941 (fTRD->GetSensChamber() != chamber)) return kFALSE;
942 if ((fTRD->GetSensPlane() >= 0) &&
943 (fTRD->GetSensPlane() != sector)) return kFALSE;
944 if ( fTRD->GetSensSector() >= 0) {
945 Int_t sens1 = fTRD->GetSensSector();
946 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
947 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
948 * AliTRDgeometry::Nsect();
949 if (sens1 < sens2) {
950 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
951 }
952 else {
953 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
954 }
955 }
956
957 return kTRUE;
958
959}
960
961//_____________________________________________________________________________
f7336fa3 962Bool_t AliTRDdigitizer::WriteDigits()
963{
964 //
965 // Writes out the TRD-digits and the dictionaries
966 //
967
968 // Create the branches
969 if (!(gAlice->TreeD()->GetBranch("TRDdigits"))) {
da581aea 970 if (!fDigits->MakeBranch()) return kFALSE;
f7336fa3 971 }
972
da581aea 973 // Store the digits and the dictionary in the tree
974 fDigits->WriteDigits();
f7336fa3 975
976 // Write the new tree into the input file (use overwrite option)
977 Char_t treeName[7];
978 sprintf(treeName,"TreeD%d",fEvent);
979 printf("AliTRDdigitizer::WriteDigits -- ");
980 printf("Write the digits tree %s for event %d.\n"
981 ,treeName,fEvent);
982 gAlice->TreeD()->Write(treeName,2);
983
984 return kTRUE;
985
986}
793ff80c 987
988//_____________________________________________________________________________
989void AliTRDdigitizer::SetPRF(TF1 *prf)
990{
991 //
992 // Defines a new pad response function
993 //
994
995 if (fPRF) delete fPRF;
996 fPRF = prf;
997
998}
999
1000//_____________________________________________________________________________
1001void AliTRDdigitizer::SetTRF(TF1 *trf)
1002{
1003 //
1004 // Defines a new time response function
1005 //
1006
1007 if (fTRF) delete fTRF;
1008 fTRF = trf;
1009
1010}
1011
1012//_____________________________________________________________________________
1013Double_t TRFlandau(Double_t *x, Double_t *par)
1014{
1015
1016 Double_t xx = x[0];
1017 Double_t landau = par[0] * TMath::Landau(xx,par[1],par[2]);
1018
1019 return landau;
1020
1021}