1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.28 2001/11/14 16:35:58 cblume
19 Inherits now from AliDetector
21 Revision 1.27 2001/11/14 10:50:45 cblume
22 Changes in digits IO. Add merging of summable digits
24 Revision 1.26 2001/11/06 17:19:41 cblume
25 Add detailed geometry and simple simulator
27 Revision 1.25 2001/06/27 09:54:44 cblume
28 Moved fField initialization to InitDetector()
30 Revision 1.24 2001/05/21 16:45:47 hristov
31 Last minute changes (C.Blume)
33 Revision 1.23 2001/05/07 08:04:48 cblume
34 New TRF and PRF. Speedup of the code. Digits from amplification region included
36 Revision 1.22 2001/03/30 14:40:14 cblume
37 Update of the digitization parameter
39 Revision 1.21 2001/03/13 09:30:35 cblume
40 Update of digitization. Moved digit branch definition to AliTRD
42 Revision 1.20 2001/02/25 20:19:00 hristov
43 Minor correction: loop variable declared only once for HP, Sun
45 Revision 1.19 2001/02/14 18:22:26 cblume
46 Change in the geometry of the padplane
48 Revision 1.18 2001/01/26 19:56:57 hristov
49 Major upgrade of AliRoot code
51 Revision 1.17 2000/12/08 12:53:27 cblume
52 Change in Copy() function for HP-compiler
54 Revision 1.16 2000/12/07 12:20:46 cblume
55 Go back to array compression. Use sampled PRF to speed up digitization
57 Revision 1.15 2000/11/23 14:34:08 cblume
58 Fixed bug in expansion routine of arrays (initialize buffers properly)
60 Revision 1.14 2000/11/20 08:54:44 cblume
61 Switch off compression as default
63 Revision 1.13 2000/11/10 14:57:52 cblume
64 Changes in the geometry constants for the DEC compiler
66 Revision 1.12 2000/11/01 14:53:20 cblume
67 Merge with TRD-develop
69 Revision 1.1.4.9 2000/10/26 17:00:22 cblume
70 Fixed bug in CheckDetector()
72 Revision 1.1.4.8 2000/10/23 13:41:35 cblume
73 Added protection against Log(0) in the gas gain calulation
75 Revision 1.1.4.7 2000/10/17 02:27:34 cblume
76 Get rid of global constants
78 Revision 1.1.4.6 2000/10/16 01:16:53 cblume
79 Changed timebin 0 to be the one closest to the readout
81 Revision 1.1.4.5 2000/10/15 23:34:29 cblume
82 Faster version of the digitizer
84 Revision 1.1.4.4 2000/10/06 16:49:46 cblume
87 Revision 1.1.4.3 2000/10/04 16:34:58 cblume
88 Replace include files by forward declarations
90 Revision 1.1.4.2 2000/09/22 14:41:10 cblume
91 Bug fix in PRF. Included time response. New structure
93 Revision 1.10 2000/10/05 07:27:53 cblume
94 Changes in the header-files by FCA
96 Revision 1.9 2000/10/02 21:28:19 fca
97 Removal of useless dependecies via forward declarations
99 Revision 1.8 2000/06/09 11:10:07 cblume
100 Compiler warnings and coding conventions, next round
102 Revision 1.7 2000/06/08 18:32:58 cblume
103 Make code compliant to coding conventions
105 Revision 1.6 2000/06/07 16:27:32 cblume
106 Try to remove compiler warnings on Sun and HP
108 Revision 1.5 2000/05/09 16:38:57 cblume
109 Removed PadResponse(). Merge problem
111 Revision 1.4 2000/05/08 15:53:45 cblume
112 Resolved merge conflict
114 Revision 1.3 2000/04/28 14:49:27 cblume
115 Only one declaration of iDict in MakeDigits()
117 Revision 1.1.4.1 2000/05/08 14:42:04 cblume
118 Introduced AliTRDdigitsManager
120 Revision 1.1 2000/02/28 19:00:13 cblume
125 ///////////////////////////////////////////////////////////////////////////////
127 // Creates and handles digits from TRD hits //
128 // Author: C. Blume (C.Blume@gsi.de) //
130 // The following effects are included: //
133 // - Gas gain including fluctuations //
134 // - Pad-response (simple Gaussian approximation) //
135 // - Time-response //
136 // - Electronics noise //
137 // - Electronics gain //
139 // - ADC threshold //
140 // The corresponding parameter can be adjusted via the various //
141 // Set-functions. If these parameters are not explicitly set, default //
142 // values are used (see Init-function). //
143 // As an example on how to use this class to produce digits from hits //
144 // have a look at the macro hits2digits.C //
145 // The production of summable digits is demonstrated in hits2sdigits.C //
146 // and the subsequent conversion of the s-digits into normal digits is //
147 // explained in sdigits2digits.C. //
149 ///////////////////////////////////////////////////////////////////////////////
165 #include "AliRunDigitizer.h"
168 #include "AliTRDhit.h"
169 #include "AliTRDdigitizer.h"
170 #include "AliTRDdataArrayI.h"
171 #include "AliTRDdataArrayF.h"
172 #include "AliTRDsegmentArray.h"
173 #include "AliTRDdigitsManager.h"
174 #include "AliTRDgeometry.h"
176 ClassImp(AliTRDdigitizer)
178 //_____________________________________________________________________________
179 AliTRDdigitizer::AliTRDdigitizer()
182 // AliTRDdigitizer default constructor
186 fDigitsManager = NULL;
187 fSDigitsManagerList = NULL;
188 fSDigitsManager = NULL;
210 fDriftVelocity = 0.0;
233 //_____________________________________________________________________________
234 AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title)
235 :AliDigitizer(name,title)
238 // AliTRDdigitizer constructor
243 fDigitsManager = NULL;
244 fSDigitsManager = NULL;
245 fSDigitsManagerList = NULL;
262 //_____________________________________________________________________________
263 AliTRDdigitizer::AliTRDdigitizer(AliRunDigitizer *manager
264 , const Text_t *name, const Text_t *title)
265 :AliDigitizer(manager,name,title)
268 // AliTRDdigitizer constructor
273 fDigitsManager = NULL;
274 fSDigitsManager = NULL;
275 fSDigitsManagerList = NULL;
292 //_____________________________________________________________________________
293 AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d)
296 // AliTRDdigitizer copy constructor
299 ((AliTRDdigitizer &) d).Copy(*this);
303 //_____________________________________________________________________________
304 AliTRDdigitizer::~AliTRDdigitizer()
307 // AliTRDdigitizer destructor
316 if (fDigitsManager) {
317 delete fDigitsManager;
318 fDigitsManager = NULL;
321 if (fSDigitsManager) {
322 delete fSDigitsManager;
323 fSDigitsManager = NULL;
326 if (fSDigitsManagerList) {
327 fSDigitsManagerList->Delete();
328 delete fSDigitsManagerList;
329 fSDigitsManagerList = NULL;
333 //_____________________________________________________________________________
334 AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d)
337 // Assignment operator
340 if (this != &d) ((AliTRDdigitizer &) d).Copy(*this);
345 //_____________________________________________________________________________
346 void AliTRDdigitizer::Copy(TObject &d)
354 ((AliTRDdigitizer &) d).fInputFile = NULL;
355 ((AliTRDdigitizer &) d).fSDigitsManagerList = NULL;
356 ((AliTRDdigitizer &) d).fSDigitsManager = NULL;
357 ((AliTRDdigitizer &) d).fDigitsManager = NULL;
358 ((AliTRDdigitizer &) d).fTRD = NULL;
359 ((AliTRDdigitizer &) d).fGeo = NULL;
361 ((AliTRDdigitizer &) d).fEvent = 0;
363 ((AliTRDdigitizer &) d).fGasGain = fGasGain;
364 ((AliTRDdigitizer &) d).fNoise = fNoise;
365 ((AliTRDdigitizer &) d).fChipGain = fChipGain;
366 ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange;
367 ((AliTRDdigitizer &) d).fADCinRange = fADCinRange;
368 ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold;
369 ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn;
370 ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT;
371 ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL;
372 ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn;
373 ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp;
374 ((AliTRDdigitizer &) d).fExBOn = fExBOn;
375 ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau;
376 ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor;
377 ((AliTRDdigitizer &) d).fDriftVelocity = fDriftVelocity;
378 ((AliTRDdigitizer &) d).fPadCoupling = fPadCoupling;
379 ((AliTRDdigitizer &) d).fTimeCoupling = fTimeCoupling;
380 ((AliTRDdigitizer &) d).fTimeBinWidth = fTimeBinWidth;
381 ((AliTRDdigitizer &) d).fField = fField;
382 ((AliTRDdigitizer &) d).fPRFOn = fPRFOn;
383 ((AliTRDdigitizer &) d).fTRFOn = fTRFOn;
385 ((AliTRDdigitizer &) d).fCompress = fCompress;
386 ((AliTRDdigitizer &) d).fVerbose = fVerbose;
387 ((AliTRDdigitizer &) d).fSDigits = fSDigits;
388 ((AliTRDdigitizer &) d).fSDigitsScale = fSDigitsScale;
390 ((AliTRDdigitizer &) d).fPRFbin = fPRFbin;
391 ((AliTRDdigitizer &) d).fPRFlo = fPRFlo;
392 ((AliTRDdigitizer &) d).fPRFhi = fPRFhi;
393 ((AliTRDdigitizer &) d).fPRFwid = fPRFwid;
394 ((AliTRDdigitizer &) d).fPRFpad = fPRFpad;
395 if (((AliTRDdigitizer &) d).fPRFsmp) delete ((AliTRDdigitizer &) d).fPRFsmp;
396 ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin];
397 for (iBin = 0; iBin < fPRFbin; iBin++) {
398 ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin];
400 ((AliTRDdigitizer &) d).fTRFbin = fTRFbin;
401 ((AliTRDdigitizer &) d).fTRFlo = fTRFlo;
402 ((AliTRDdigitizer &) d).fTRFhi = fTRFhi;
403 ((AliTRDdigitizer &) d).fTRFwid = fTRFwid;
404 if (((AliTRDdigitizer &) d).fTRFsmp) delete ((AliTRDdigitizer &) d).fTRFsmp;
405 ((AliTRDdigitizer &) d).fTRFsmp = new Float_t[fTRFbin];
406 for (iBin = 0; iBin < fTRFbin; iBin++) {
407 ((AliTRDdigitizer &) d).fTRFsmp[iBin] = fTRFsmp[iBin];
412 //_____________________________________________________________________________
413 Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz)
416 // Applies the diffusion smearing to the position of a single electron
419 Float_t driftSqrt = TMath::Sqrt(driftlength);
420 Float_t sigmaT = driftSqrt * fDiffusionT;
421 Float_t sigmaL = driftSqrt * fDiffusionL;
422 xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor);
423 xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor);
424 xyz[2] = gRandom->Gaus(xyz[2], sigmaT);
430 //_____________________________________________________________________________
431 Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz)
434 // Applies E x B effects to the position of a single electron
438 xyz[1] = xyz[1] + fOmegaTau * driftlength;
445 //_____________________________________________________________________________
446 Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad)
449 // Applies the pad response
452 Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid));
454 Int_t iBin0 = iBin - fPRFpad;
456 Int_t iBin2 = iBin + fPRFpad;
458 if ((iBin0 >= 0) && (iBin2 < fPRFbin)) {
460 pad[0] = signal * fPRFsmp[iBin0];
461 pad[1] = signal * fPRFsmp[iBin1];
462 pad[2] = signal * fPRFsmp[iBin2];
475 //_____________________________________________________________________________
476 Float_t AliTRDdigitizer::TimeResponse(Float_t time)
479 // Applies the preamp shaper time response
482 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));
483 if ((iBin >= 0) && (iBin < fTRFbin)) {
484 return fTRFsmp[iBin];
492 //_____________________________________________________________________________
493 Bool_t AliTRDdigitizer::Init()
496 // Initializes the digitization procedure with standard values
499 // The default parameter for the digitization
503 fADCoutRange = 1023.; // 10-bit ADC
504 fADCinRange = 1000.; // 1V input range
507 // For the summable digits
508 fSDigitsScale = 100.;
510 // The drift velocity (cm / mus)
511 fDriftVelocity = 1.5;
519 // Propability for electron attachment
523 // The pad response function
526 // The time response function
529 // The pad coupling factor (same number as for the TPC)
532 // The time coupling factor (same number as for the TPC)
539 //_____________________________________________________________________________
540 Bool_t AliTRDdigitizer::ReInit()
543 // Reinitializes the digitization procedure after a change in the parameter
547 printf("AliTRDdigitizer::ReInit -- ");
548 printf("No geometry defined. Run InitDetector() first\n");
552 // Calculate the time bin width in ns
553 fTimeBinWidth = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0;
555 // The range and the binwidth for the sampled TRF
557 // Start 0.2 mus before the signal
558 fTRFlo = -0.2 * fDriftVelocity;
559 // End the maximum driftlength after the signal
560 fTRFhi = AliTRDgeometry::DrThick()
561 + fGeo->GetTimeAfter() * fGeo->GetTimeBinSize();
562 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
564 // Transverse and longitudinal diffusion coefficients (Xe/CO2)
565 fDiffusionT = GetDiffusionT(fDriftVelocity,fField);
566 fDiffusionL = GetDiffusionL(fDriftVelocity,fField);
568 // omega * tau.= tan(Lorentz-angle)
569 fOmegaTau = GetOmegaTau(fDriftVelocity,fField);
571 // The Lorentz factor
573 fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau);
576 fLorentzFactor = 1.0;
583 //_____________________________________________________________________________
584 void AliTRDdigitizer::SampleTRF()
587 // Samples the time response function
588 // It is defined according to Vasiles simulation of the preamp shaper
589 // output and includes the effect of the ion tail (based on Tariqs
590 // Garfield simulation) and a shaping time of 125 ns FWHM
597 const Int_t kNpasa = 200;
598 Float_t time[kNpasa] = { -0.280000, -0.270000, -0.260000, -0.250000
599 , -0.240000, -0.230000, -0.220000, -0.210000
600 , -0.200000, -0.190000, -0.180000, -0.170000
601 , -0.160000, -0.150000, -0.140000, -0.130000
602 , -0.120000, -0.110000, -0.100000, -0.090000
603 , -0.080000, -0.070000, -0.060000, -0.050000
604 , -0.040000, -0.030000, -0.020000, -0.010000
605 , -0.000000, 0.010000, 0.020000, 0.030000
606 , 0.040000, 0.050000, 0.060000, 0.070000
607 , 0.080000, 0.090000, 0.100000, 0.110000
608 , 0.120000, 0.130000, 0.140000, 0.150000
609 , 0.160000, 0.170000, 0.180000, 0.190000
610 , 0.200000, 0.210000, 0.220000, 0.230000
611 , 0.240000, 0.250000, 0.260000, 0.270000
612 , 0.280000, 0.290000, 0.300000, 0.310000
613 , 0.320000, 0.330000, 0.340000, 0.350000
614 , 0.360000, 0.370000, 0.380000, 0.390000
615 , 0.400000, 0.410000, 0.420000, 0.430000
616 , 0.440000, 0.450000, 0.460000, 0.470000
617 , 0.480000, 0.490000, 0.500000, 0.510000
618 , 0.520000, 0.530000, 0.540000, 0.550000
619 , 0.560000, 0.570000, 0.580000, 0.590000
620 , 0.600000, 0.610000, 0.620000, 0.630000
621 , 0.640000, 0.650000, 0.660000, 0.670000
622 , 0.680000, 0.690000, 0.700000, 0.710000
623 , 0.720000, 0.730000, 0.740000, 0.750000
624 , 0.760000, 0.770000, 0.780000, 0.790000
625 , 0.800000, 0.810000, 0.820000, 0.830000
626 , 0.840000, 0.850000, 0.860000, 0.870000
627 , 0.880000, 0.890000, 0.900000, 0.910000
628 , 0.920000, 0.930000, 0.940000, 0.950000
629 , 0.960000, 0.970000, 0.980000, 0.990000
630 , 1.000000, 1.010000, 1.020000, 1.030000
631 , 1.040000, 1.050000, 1.060000, 1.070000
632 , 1.080000, 1.090000, 1.100000, 1.110000
633 , 1.120000, 1.130000, 1.140000, 1.150000
634 , 1.160000, 1.170000, 1.180000, 1.190000
635 , 1.200000, 1.210000, 1.220000, 1.230000
636 , 1.240000, 1.250000, 1.260000, 1.270000
637 , 1.280000, 1.290000, 1.300000, 1.310000
638 , 1.320000, 1.330000, 1.340000, 1.350000
639 , 1.360000, 1.370000, 1.380000, 1.390000
640 , 1.400000, 1.410000, 1.420000, 1.430000
641 , 1.440000, 1.450000, 1.460000, 1.470000
642 , 1.480000, 1.490000, 1.500000, 1.510000
643 , 1.520000, 1.530000, 1.540000, 1.550000
644 , 1.560000, 1.570000, 1.580000, 1.590000
645 , 1.600000, 1.610000, 1.620000, 1.630000
646 , 1.640000, 1.650000, 1.660000, 1.670000
647 , 1.680000, 1.690000, 1.700000, 1.710000 };
649 Float_t signal[kNpasa] = { 0.000000, 0.000000, 0.000000, 0.000000
650 , 0.000000, 0.000000, 0.000000, 0.000000
651 , 0.000000, 0.000000, 0.000000, 0.000000
652 , 0.000000, 0.000000, 0.000000, 0.000098
653 , 0.003071, 0.020056, 0.066053, 0.148346
654 , 0.263120, 0.398496, 0.540226, 0.674436
655 , 0.790977, 0.883083, 0.947744, 0.985714
656 , 0.999248, 0.992105, 0.967669, 0.930827
657 , 0.884586, 0.833083, 0.778571, 0.723684
658 , 0.669173, 0.617293, 0.567669, 0.521805
659 , 0.479699, 0.440977, 0.405639, 0.373985
660 , 0.345526, 0.320038, 0.297256, 0.276917
661 , 0.258797, 0.242632, 0.228195, 0.215301
662 , 0.203759, 0.193383, 0.184023, 0.175564
663 , 0.167895, 0.160940, 0.154549, 0.148722
664 , 0.143308, 0.138346, 0.133722, 0.129398
665 , 0.125376, 0.121617, 0.118045, 0.114699
666 , 0.111541, 0.108571, 0.105714, 0.103008
667 , 0.100414, 0.097970, 0.095602, 0.093346
668 , 0.091165, 0.089060, 0.087068, 0.085150
669 , 0.083308, 0.081541, 0.079812, 0.078158
670 , 0.076541, 0.075000, 0.073496, 0.072068
671 , 0.070677, 0.069286, 0.068008, 0.066729
672 , 0.065489, 0.064286, 0.063120, 0.061992
673 , 0.060902, 0.059850, 0.058797, 0.057820
674 , 0.056842, 0.055902, 0.054962, 0.054060
675 , 0.053158, 0.052293, 0.051466, 0.050639
676 , 0.049850, 0.049060, 0.048308, 0.047556
677 , 0.046842, 0.046128, 0.045451, 0.044774
678 , 0.044098, 0.043459, 0.042820, 0.042218
679 , 0.041617, 0.041015, 0.040451, 0.039887
680 , 0.039323, 0.038797, 0.038271, 0.037744
681 , 0.037237, 0.036744, 0.036259, 0.035786
682 , 0.035323, 0.034872, 0.034429, 0.033996
683 , 0.033575, 0.033162, 0.032756, 0.032361
684 , 0.031974, 0.031594, 0.031222, 0.030857
685 , 0.030496, 0.030143, 0.029793, 0.029451
686 , 0.029109, 0.028774, 0.028444, 0.028113
687 , 0.027793, 0.027477, 0.027165, 0.026861
688 , 0.026564, 0.026271, 0.025981, 0.025699
689 , 0.025421, 0.025147, 0.024880, 0.024613
690 , 0.024353, 0.024094, 0.023842, 0.023590
691 , 0.023346, 0.023102, 0.022865, 0.022628
692 , 0.022398, 0.022173, 0.021951, 0.021733
693 , 0.021519, 0.021308, 0.021098, 0.020891
694 , 0.020688, 0.020485, 0.020286, 0.020090
695 , 0.019895, 0.019707, 0.019519, 0.019335
696 , 0.019150, 0.018974, 0.018797, 0.018624
697 , 0.018451, 0.018282, 0.018113, 0.017947
698 , 0.017782, 0.017617, 0.017455, 0.017297 };
700 if (fTRFsmp) delete fTRFsmp;
701 fTRFsmp = new Float_t[fTRFbin];
703 Float_t loTRF = TMath::Max(fTRFlo / fDriftVelocity,time[0]);
704 Float_t hiTRF = TMath::Min(fTRFhi / fDriftVelocity,time[kNpasa-1]);
705 Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin);
707 // Take the linear interpolation
708 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
710 Float_t bin = (((Float_t) iBin) + 0.5) * binWidth + loTRF;
714 diff = bin - time[ipos2++];
717 if (ipos2 > kNpasa) ipos2 = kNpasa - 1;
720 fTRFsmp[iBin] = signal[ipos2]
721 + diff * (signal[ipos2] - signal[ipos1])
722 / ( time[ipos2] - time[ipos1]);
728 //_____________________________________________________________________________
729 void AliTRDdigitizer::SamplePRF()
732 // Samples the pad response function
735 const Int_t kPRFbin = 61;
736 Float_t prf[kPRFbin] = { 0.002340, 0.003380, 0.004900, 0.007080, 0.010220
737 , 0.014740, 0.021160, 0.030230, 0.042800, 0.059830
738 , 0.082030, 0.109700, 0.142550, 0.179840, 0.220610
739 , 0.263980, 0.309180, 0.355610, 0.402790, 0.450350
740 , 0.497930, 0.545190, 0.591740, 0.637100, 0.680610
741 , 0.721430, 0.758400, 0.790090, 0.814720, 0.830480
742 , 0.835930, 0.830480, 0.814710, 0.790070, 0.758390
743 , 0.721410, 0.680590, 0.637080, 0.591730, 0.545180
744 , 0.497920, 0.450340, 0.402790, 0.355610, 0.309190
745 , 0.263990, 0.220630, 0.179850, 0.142570, 0.109720
746 , 0.082040, 0.059830, 0.042820, 0.030230, 0.021170
747 , 0.014740, 0.010230, 0.007080, 0.004900, 0.003380
753 fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin);
754 fPRFpad = ((Int_t) (1.0 / fPRFwid));
756 if (fPRFsmp) delete fPRFsmp;
757 fPRFsmp = new Float_t[fPRFbin];
758 for (Int_t iBin = 0; iBin < fPRFbin; iBin++) {
759 fPRFsmp[iBin] = prf[iBin];
764 //_____________________________________________________________________________
765 Bool_t AliTRDdigitizer::Open(const Char_t *name, Int_t nEvent)
768 // Opens a ROOT-file with TRD-hits and reads in the hit-tree
771 // Connect the AliRoot file containing Geometry, Kine, and Hits
772 fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(name);
775 printf("AliTRDdigitizer::Open -- ");
776 printf("Open the AliROOT-file %s.\n",name);
778 fInputFile = new TFile(name,"UPDATE");
782 printf("AliTRDdigitizer::Open -- ");
783 printf("%s is already open.\n",name);
787 gAlice = (AliRun*) fInputFile->Get("gAlice");
790 printf("AliTRDdigitizer::Open -- ");
791 printf("AliRun object found on file.\n");
795 printf("AliTRDdigitizer::Open -- ");
796 printf("Could not find AliRun object.\n");
802 // Import the Trees for the event nEvent in the file
803 Int_t nparticles = gAlice->GetEvent(fEvent);
804 if (nparticles <= 0) {
805 printf("AliTRDdigitizer::Open -- ");
806 printf("No entries in the trees for event %d.\n",fEvent);
810 if (InitDetector()) {
819 //_____________________________________________________________________________
820 Bool_t AliTRDdigitizer::InitDetector()
823 // Sets the pointer to the TRD detector and the geometry
826 // Get the pointer to the detector class and check for version 1
827 fTRD = (AliTRD*) gAlice->GetDetector("TRD");
828 if (fTRD->IsVersion() != 1) {
829 printf("AliTRDdigitizer::InitDetector -- ");
830 printf("TRD must be version 1 (slow simulator).\n");
835 fGeo = fTRD->GetGeometry();
837 printf("AliTRDdigitizer::InitDetector -- ");
838 printf("Geometry version %d\n",fGeo->IsVersion());
841 // The magnetic field strength in Tesla
842 fField = 0.2 * gAlice->Field()->Factor();
844 // Create a digits manager
845 fDigitsManager = new AliTRDdigitsManager();
846 fDigitsManager->SetSDigits(fSDigits);
847 fDigitsManager->CreateArrays();
848 fDigitsManager->SetEvent(fEvent);
849 fDigitsManager->SetVerbose(fVerbose);
851 // The list for the input s-digits manager to be merged
852 fSDigitsManagerList = new TList();
858 //_____________________________________________________________________________
859 Bool_t AliTRDdigitizer::MakeBranch(const Char_t *file)
862 // Create the branches for the digits array
865 return fDigitsManager->MakeBranch(file);
869 //_____________________________________________________________________________
870 Bool_t AliTRDdigitizer::MakeDigits()
876 ///////////////////////////////////////////////////////////////
878 ///////////////////////////////////////////////////////////////
880 // Converts number of electrons to fC
881 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
883 ///////////////////////////////////////////////////////////////
885 // Number of pads included in the pad response
886 const Int_t kNpad = 3;
888 // Number of track dictionary arrays
889 const Int_t kNDict = AliTRDdigitsManager::kNDict;
891 // Half the width of the amplification region
892 const Float_t kAmWidth = AliTRDgeometry::AmThick() / 2.;
894 Int_t iRow, iCol, iTime, iPad;
898 Int_t totalSizeDigits = 0;
899 Int_t totalSizeDict0 = 0;
900 Int_t totalSizeDict1 = 0;
901 Int_t totalSizeDict2 = 0;
903 Int_t timeTRDbeg = 0;
904 Int_t timeTRDend = 1;
909 Float_t padSignal[kNpad];
910 Float_t signalOld[kNpad];
912 AliTRDdataArrayF *signals = 0;
913 AliTRDdataArrayI *digits = 0;
914 AliTRDdataArrayI *dictionary[kNDict];
916 // Create a container for the amplitudes
917 AliTRDsegmentArray *signalsArray
918 = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet());
921 timeTRDbeg = ((Int_t) (-fTRFlo / fGeo->GetTimeBinSize())) - 1;
922 timeTRDend = ((Int_t) ( fTRFhi / fGeo->GetTimeBinSize())) - 1;
924 printf("AliTRDdigitizer::MakeDigits -- ");
925 printf("Sample the TRF between -%d and %d\n",timeTRDbeg,timeTRDend);
929 Float_t elAttachProp = fElAttachProp / 100.;
931 // Create the sampled PRF
934 // Create the sampled TRF
938 printf("AliTRDdigitizer::MakeDigits -- ");
939 printf("No geometry defined\n");
944 printf("AliTRDdigitizer::MakeDigits -- ");
945 printf("Start creating digits.\n");
948 // Get the pointer to the hit tree
949 TTree *HitTree = gAlice->TreeH();
951 // Get the number of entries in the hit tree
952 // (Number of primary particles creating a hit somewhere)
953 Int_t nTrack = (Int_t) HitTree->GetEntries();
955 printf("AliTRDdigitizer::MakeDigits -- ");
956 printf("Found %d primary particles\n",nTrack);
959 Int_t detectorOld = -1;
962 // Loop through all entries in the tree
963 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
966 nBytes += HitTree->GetEvent(iTrack);
968 // Get the number of hits in the TRD created by this particle
969 Int_t nHit = fTRD->Hits()->GetEntriesFast();
971 printf("AliTRDdigitizer::MakeDigits -- ");
972 printf("Found %d hits for primary particle %d\n",nHit,iTrack);
975 // Loop through the TRD hits
976 for (Int_t iHit = 0; iHit < nHit; iHit++) {
980 AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit);
984 Float_t q = hit->GetCharge();
985 Int_t track = hit->Track();
986 Int_t detector = hit->GetDetector();
987 Int_t plane = fGeo->GetPlane(detector);
988 Int_t sector = fGeo->GetSector(detector);
989 Int_t chamber = fGeo->GetChamber(detector);
991 if (!(CheckDetector(plane,chamber,sector))) continue;
993 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
994 Int_t nColMax = fGeo->GetColMax(plane);
995 Int_t nTimeMax = fGeo->GetTimeMax();
996 Int_t nTimeBefore = fGeo->GetTimeBefore();
997 Int_t nTimeAfter = fGeo->GetTimeAfter();
998 Int_t nTimeTotal = fGeo->GetTimeTotal();
999 Float_t row0 = fGeo->GetRow0(plane,chamber,sector);
1000 Float_t col0 = fGeo->GetCol0(plane);
1001 Float_t time0 = fGeo->GetTime0(plane);
1002 Float_t rowPadSize = fGeo->GetRowPadSize(plane,chamber,sector);
1003 Float_t colPadSize = fGeo->GetColPadSize(plane);
1004 Float_t timeBinSize = fGeo->GetTimeBinSize();
1005 Float_t divideRow = 1.0 / rowPadSize;
1006 Float_t divideCol = 1.0 / colPadSize;
1007 Float_t divideTime = 1.0 / timeBinSize;
1010 printf("Analyze hit no. %d ",iHit);
1011 printf("-----------------------------------------------------------\n");
1013 printf("plane = %d, sector = %d, chamber = %d\n"
1014 ,plane,sector,chamber);
1015 printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n"
1016 ,nRowMax,nColMax,nTimeMax);
1017 printf("nTimeBefore = %d, nTimeAfter = %d, nTimeTotal = %d\n"
1018 ,nTimeBefore,nTimeAfter,nTimeTotal);
1019 printf("row0 = %f, col0 = %f, time0 = %f\n"
1021 printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n"
1022 ,rowPadSize,colPadSize,timeBinSize);
1025 // Don't analyze test hits
1026 if (hit->FromTest()) continue;
1028 if (detector != detectorOld) {
1031 printf("AliTRDdigitizer::MakeDigits -- ");
1032 printf("Get new container. New det = %d, Old det = %d\n"
1033 ,detector,detectorOld);
1035 // Compress the old one if enabled
1036 if ((fCompress) && (detectorOld > -1)) {
1038 printf("AliTRDdigitizer::MakeDigits -- ");
1039 printf("Compress the old container ...");
1041 signals->Compress(1,0);
1042 for (iDict = 0; iDict < kNDict; iDict++) {
1043 dictionary[iDict]->Compress(1,0);
1045 if (fVerbose > 1) printf("done\n");
1047 // Get the new container
1048 signals = (AliTRDdataArrayF *) signalsArray->At(detector);
1049 if (signals->GetNtime() == 0) {
1050 // Allocate a new one if not yet existing
1052 printf("AliTRDdigitizer::MakeDigits -- ");
1053 printf("Allocate a new container ... ");
1055 signals->Allocate(nRowMax,nColMax,nTimeTotal);
1058 // Expand an existing one
1061 printf("AliTRDdigitizer::MakeDigits -- ");
1062 printf("Expand an existing container ... ");
1067 // The same for the dictionary
1068 for (iDict = 0; iDict < kNDict; iDict++) {
1069 dictionary[iDict] = fDigitsManager->GetDictionary(detector,iDict);
1070 if (dictionary[iDict]->GetNtime() == 0) {
1071 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1074 if (fCompress) dictionary[iDict]->Expand();
1077 if (fVerbose > 1) printf("done\n");
1078 detectorOld = detector;
1081 // Rotate the sectors on top of each other
1082 fGeo->Rotate(detector,pos,rot);
1084 // The driftlength. It is negative if the hit is in the
1085 // amplification region.
1086 Float_t driftlength = time0 - rot[0];
1088 // Take also the drift in the amplification region into account
1089 // The drift length is at the moment still the same, regardless of
1090 // the position relativ to the wire. This non-isochronity needs still
1091 // to be implemented.
1092 Float_t driftlengthL = TMath::Abs(driftlength + kAmWidth);
1093 if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor);
1095 // Loop over all electrons of this hit
1096 // TR photons produce hits with negative charge
1097 Int_t nEl = ((Int_t) TMath::Abs(q));
1098 for (Int_t iEl = 0; iEl < nEl; iEl++) {
1104 // Electron attachment
1106 if (gRandom->Rndm() < (driftlengthL * elAttachProp))
1110 // Apply the diffusion smearing
1112 if (!(Diffusion(driftlengthL,xyz))) continue;
1115 // Apply E x B effects (depends on drift direction)
1117 if (!(ExB(driftlength+kAmWidth,xyz))) continue;
1120 // The electron position after diffusion and ExB in pad coordinates
1121 // The pad row (z-direction)
1122 Int_t rowE = ((Int_t) ((xyz[2] - row0) * divideRow));
1123 if ((rowE < 0) || (rowE >= nRowMax)) continue;
1125 // The pad column (rphi-direction)
1126 Int_t colE = ((Int_t) ((xyz[1] - col0) * divideCol));
1127 if ((colE < 0) || (colE >= nColMax)) continue;
1129 // The time bin (negative for hits in the amplification region)
1130 // In the amplification region the electrons drift from both sides
1131 // to the middle (anode wire plane)
1132 Float_t timeDist = time0 - xyz[0];
1133 Float_t timeOffset = 0;
1137 timeE = ((Int_t) (timeDist * divideTime));
1138 // The distance of the position to the middle of the timebin
1139 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) - timeDist;
1142 // Difference between half of the amplification gap width and
1143 // the distance to the anode wire
1144 Float_t anodeDist = kAmWidth - TMath::Abs(timeDist + kAmWidth);
1146 timeE = -1 * (((Int_t ) (anodeDist * divideTime)) + 1);
1147 // The distance of the position to the middle of the timebin
1148 timeOffset = ((((Float_t) timeE) + 0.5) * timeBinSize) + anodeDist;
1151 // Apply the gas gain including fluctuations
1152 Float_t ggRndm = 0.0;
1154 ggRndm = gRandom->Rndm();
1155 } while (ggRndm <= 0);
1156 Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm));
1158 // Apply the pad response
1160 // The distance of the electron to the center of the pad
1161 // in units of pad width
1162 Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize)
1164 if (!(PadResponse(signal,dist,padSignal))) continue;
1168 padSignal[1] = signal;
1172 // Sample the time response inside the drift region
1173 // + additional time bins before and after.
1174 // The sampling is done always in the middle of the time bin
1175 for (Int_t iTimeBin = TMath::Max(timeE-timeTRDbeg, -nTimeBefore)
1176 ;iTimeBin < TMath::Min(timeE+timeTRDend,nTimeMax+nTimeAfter )
1179 // Apply the time response
1180 Float_t timeResponse = 1.0;
1182 Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset;
1183 timeResponse = TimeResponse(time);
1190 for (iPad = 0; iPad < kNpad; iPad++) {
1192 Int_t colPos = colE + iPad - 1;
1193 if (colPos < 0) continue;
1194 if (colPos >= nColMax) break;
1197 // Note: The time bin number is shifted by nTimeBefore to avoid negative
1198 // time bins. This has to be subtracted later.
1199 Int_t iCurrentTimeBin = iTimeBin + nTimeBefore;
1200 signalOld[iPad] = signals->GetDataUnchecked(rowE,colPos,iCurrentTimeBin);
1201 signalOld[iPad] += padSignal[iPad] * timeResponse;
1202 signals->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,signalOld[iPad]);
1204 // Store the track index in the dictionary
1205 // Note: We store index+1 in order to allow the array to be compressed
1206 if (signalOld[iPad] > 0) {
1207 for (iDict = 0; iDict < kNDict; iDict++) {
1208 Int_t oldTrack = dictionary[iDict]->GetDataUnchecked(rowE
1211 if (oldTrack == track+1) break;
1212 if (oldTrack == 0) {
1213 dictionary[iDict]->SetDataUnchecked(rowE,colPos,iCurrentTimeBin,track+1);
1227 } // All hits finished
1230 printf("AliTRDdigitizer::MakeDigits -- ");
1231 printf("Finished analyzing %d hits\n",countHits);
1234 // The total conversion factor
1235 Float_t convert = kEl2fC * fPadCoupling * fTimeCoupling * fChipGain;
1237 // Loop through all chambers to finalize the digits
1238 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1240 Int_t plane = fGeo->GetPlane(iDet);
1241 Int_t sector = fGeo->GetSector(iDet);
1242 Int_t chamber = fGeo->GetChamber(iDet);
1243 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1244 Int_t nColMax = fGeo->GetColMax(plane);
1245 Int_t nTimeMax = fGeo->GetTimeMax();
1246 Int_t nTimeTotal = fGeo->GetTimeTotal();
1249 printf("AliTRDdigitizer::MakeDigits -- ");
1250 printf("Digitization for chamber %d\n",iDet);
1253 // Add a container for the digits of this detector
1254 digits = fDigitsManager->GetDigits(iDet);
1255 // Allocate memory space for the digits buffer
1256 digits->Allocate(nRowMax,nColMax,nTimeTotal);
1258 // Get the signal container
1259 signals = (AliTRDdataArrayF *) signalsArray->At(iDet);
1260 if (signals->GetNtime() == 0) {
1261 // Create missing containers
1262 signals->Allocate(nRowMax,nColMax,nTimeTotal);
1265 // Expand the container if neccessary
1266 if (fCompress) signals->Expand();
1268 // Create the missing dictionary containers
1269 for (iDict = 0; iDict < kNDict; iDict++) {
1270 dictionary[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
1271 if (dictionary[iDict]->GetNtime() == 0) {
1272 dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1278 // Don't create noise in detectors that are switched off
1279 if (CheckDetector(plane,chamber,sector)) {
1281 // Create the digits for this chamber
1282 for (iRow = 0; iRow < nRowMax; iRow++ ) {
1283 for (iCol = 0; iCol < nColMax; iCol++ ) {
1284 for (iTime = 0; iTime < nTimeTotal; iTime++) {
1286 // Create summable digits
1289 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
1290 signalAmp *= fSDigitsScale;
1291 signalAmp = TMath::Min(signalAmp,(Float_t)1.0e9);
1292 Int_t adc = (Int_t) signalAmp;
1294 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
1297 // Create normal digits
1300 Float_t signalAmp = signals->GetDataUnchecked(iRow,iCol,iTime);
1303 signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0);
1305 signalAmp *= convert;
1306 // Convert to ADC counts. Set the overflow-bit fADCoutRange if the
1307 // signal is larger than fADCinRange
1309 if (signalAmp >= fADCinRange) {
1310 adc = ((Int_t) fADCoutRange);
1313 adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange)));
1316 // Store the amplitude of the digit if above threshold
1317 if (adc > fADCthreshold) {
1319 printf(" iRow = %d, iCol = %d, iTime = %d\n"
1321 printf(" signal = %f, adc = %d\n",signalAmp,adc);
1324 digits->SetDataUnchecked(iRow,iCol,iTime,adc);
1335 // Compress the arrays
1336 digits->Compress(1,0);
1337 for (iDict = 0; iDict < kNDict; iDict++) {
1338 dictionary[iDict]->Compress(1,0);
1341 totalSizeDigits += digits->GetSize();
1342 totalSizeDict0 += dictionary[0]->GetSize();
1343 totalSizeDict1 += dictionary[1]->GetSize();
1344 totalSizeDict2 += dictionary[2]->GetSize();
1346 Float_t nPixel = nRowMax * nColMax * nTimeMax;
1348 printf("AliTRDdigitizer::MakeDigits -- ");
1349 printf("Found %d digits in detector %d (%3.0f).\n"
1351 ,100.0 * ((Float_t) nDigits) / nPixel);
1354 if (fCompress) signals->Compress(1,0);
1359 printf("AliTRDdigitizer::MakeDigits -- ");
1360 printf("Total number of analyzed hits = %d\n",countHits);
1361 printf("AliTRDdigitizer::MakeDigits -- ");
1362 printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits
1372 //_____________________________________________________________________________
1373 void AliTRDdigitizer::AddSDigitsManager(AliTRDdigitsManager *man)
1376 // Add a digits manager for s-digits to the input list.
1379 fSDigitsManagerList->Add(man);
1383 //_____________________________________________________________________________
1384 Bool_t AliTRDdigitizer::ConvertSDigits()
1387 // Converts s-digits to normal digits
1390 // Number of track dictionary arrays
1391 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1393 // Converts number of electrons to fC
1394 const Double_t kEl2fC = 1.602E-19 * 1.0E15;
1402 Double_t sDigitsScale = 1.0 / GetSDigitsScale();
1403 Double_t noise = GetNoise();
1404 Double_t padCoupling = GetPadCoupling();
1405 Double_t timeCoupling = GetTimeCoupling();
1406 Double_t chipGain = GetChipGain();
1407 Double_t convert = kEl2fC * padCoupling * timeCoupling * chipGain;;
1408 Double_t adcInRange = GetADCinRange();
1409 Double_t adcOutRange = GetADCoutRange();
1410 Int_t adcThreshold = GetADCthreshold();
1412 AliTRDdataArrayI *digitsIn;
1413 AliTRDdataArrayI *digitsOut;
1414 AliTRDdataArrayI *dictionaryIn[kNDict];
1415 AliTRDdataArrayI *dictionaryOut[kNDict];
1417 // Loop through the detectors
1418 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1421 printf("AliTRDdigitizer::ConvertSDigits -- ");
1422 printf("Convert detector %d to digits.\n",iDet);
1425 Int_t plane = fGeo->GetPlane(iDet);
1426 Int_t sector = fGeo->GetSector(iDet);
1427 Int_t chamber = fGeo->GetChamber(iDet);
1428 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1429 Int_t nColMax = fGeo->GetColMax(plane);
1430 Int_t nTimeTotal = fGeo->GetTimeTotal();
1432 digitsIn = fSDigitsManager->GetDigits(iDet);
1434 digitsOut = fDigitsManager->GetDigits(iDet);
1435 digitsOut->Allocate(nRowMax,nColMax,nTimeTotal);
1436 for (iDict = 0; iDict < kNDict; iDict++) {
1437 dictionaryIn[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
1438 dictionaryIn[iDict]->Expand();
1439 dictionaryOut[iDict] = fDigitsManager->GetDictionary(iDet,iDict);
1440 dictionaryOut[iDict]->Allocate(nRowMax,nColMax,nTimeTotal);
1443 for (Int_t iRow = 0; iRow < nRowMax; iRow++ ) {
1444 for (Int_t iCol = 0; iCol < nColMax; iCol++ ) {
1445 for (Int_t iTime = 0; iTime < nTimeTotal; iTime++) {
1447 Double_t signal = (Double_t) digitsIn->GetDataUnchecked(iRow,iCol,iTime);
1448 signal *= sDigitsScale;
1450 signal = TMath::Max((Double_t) gRandom->Gaus(signal,noise),0.0);
1453 // Convert to ADC counts. Set the overflow-bit adcOutRange if the
1454 // signal is larger than adcInRange
1456 if (signal >= adcInRange) {
1457 adc = ((Int_t) adcOutRange);
1460 adc = ((Int_t) (signal * (adcOutRange / adcInRange)));
1462 // Store the amplitude of the digit if above threshold
1463 if (adc > adcThreshold) {
1464 digitsOut->SetDataUnchecked(iRow,iCol,iTime,adc);
1466 // Copy the dictionary
1467 for (iDict = 0; iDict < kNDict; iDict++) {
1468 Int_t track = dictionaryIn[iDict]->GetDataUnchecked(iRow,iCol,iTime);
1469 dictionaryOut[iDict]->SetDataUnchecked(iRow,iCol,iTime,track);
1477 digitsIn->Compress(1,0);
1478 digitsOut->Compress(1,0);
1479 for (iDict = 0; iDict < kNDict; iDict++) {
1480 dictionaryIn[iDict]->Compress(1,0);
1481 dictionaryOut[iDict]->Compress(1,0);
1491 //_____________________________________________________________________________
1492 Bool_t AliTRDdigitizer::MergeSDigits()
1495 // Merges the input s-digits:
1496 // - The amplitude of the different inputs are summed up.
1497 // - Of the track IDs from the input dictionaries only one is
1498 // kept for each input. This works for maximal 3 different merged inputs.
1501 // Number of track dictionary arrays
1502 const Int_t kNDict = AliTRDdigitsManager::kNDict;
1506 AliTRDdataArrayI *digitsA;
1507 AliTRDdataArrayI *digitsB;
1508 AliTRDdataArrayI *dictionaryA[kNDict];
1509 AliTRDdataArrayI *dictionaryB[kNDict];
1511 // Get the first s-digits
1512 fSDigitsManager = (AliTRDdigitsManager *) fSDigitsManagerList->First();
1513 if (!fSDigitsManager) return kFALSE;
1515 // Loop through the other sets of s-digits
1516 AliTRDdigitsManager *mergeSDigitsManager;
1517 mergeSDigitsManager = (AliTRDdigitsManager *)
1518 fSDigitsManagerList->After(fSDigitsManager);
1521 if (mergeSDigitsManager) {
1522 printf("AliTRDdigitizer::MergeSDigits -- ");
1523 printf("Merge serveral input files.\n");
1526 printf("AliTRDdigitizer::MergeSDigits -- ");
1527 printf("Only one input file.\n");
1532 while (mergeSDigitsManager) {
1536 // Loop through the detectors
1537 for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) {
1539 Int_t plane = fGeo->GetPlane(iDet);
1540 Int_t sector = fGeo->GetSector(iDet);
1541 Int_t chamber = fGeo->GetChamber(iDet);
1542 Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector);
1543 Int_t nColMax = fGeo->GetColMax(plane);
1544 Int_t nTimeTotal = fGeo->GetTimeTotal();
1546 // Loop through the pixels of one detector and add the signals
1547 digitsA = fSDigitsManager->GetDigits(iDet);
1548 digitsB = mergeSDigitsManager->GetDigits(iDet);
1551 for (iDict = 0; iDict < kNDict; iDict++) {
1552 dictionaryA[iDict] = fSDigitsManager->GetDictionary(iDet,iDict);
1553 dictionaryB[iDict] = mergeSDigitsManager->GetDictionary(iDet,iDict);
1554 dictionaryA[iDict]->Expand();
1555 dictionaryB[iDict]->Expand();
1559 printf("AliTRDdigitizer::MergeSDigits -- ");
1560 printf("Merge detector %d of input no.%d.\n",iDet,iMerge);
1563 for (Int_t iRow = 0; iRow < nRowMax; iRow++ ) {
1564 for (Int_t iCol = 0; iCol < nColMax; iCol++ ) {
1565 for (Int_t iTime = 0; iTime < nTimeTotal; iTime++) {
1567 // Add the amplitudes of the summable digits
1568 Int_t ampA = digitsA->GetDataUnchecked(iRow,iCol,iTime);
1569 Int_t ampB = digitsB->GetDataUnchecked(iRow,iCol,iTime);
1571 digitsA->SetDataUnchecked(iRow,iCol,iTime,ampA);
1573 // Take only one track from each input
1574 Int_t track = dictionaryB[0]->GetDataUnchecked(iRow,iCol,iTime);
1575 if (iMerge < kNDict) {
1576 dictionaryA[iMerge]->SetDataUnchecked(iRow,iCol,iTime,track);
1584 digitsA->Compress(1,0);
1585 digitsB->Compress(1,0);
1586 for (iDict = 0; iDict < kNDict; iDict++) {
1587 dictionaryA[iDict]->Compress(1,0);
1588 dictionaryB[iDict]->Compress(1,0);
1594 // The next set of s-digits
1595 mergeSDigitsManager = (AliTRDdigitsManager *)
1596 fSDigitsManagerList->After(mergeSDigitsManager);
1604 //_____________________________________________________________________________
1605 Bool_t AliTRDdigitizer::SDigits2Digits()
1608 // Merges the input s-digits and converts them to normal digits
1611 if (!MergeSDigits()) return kFALSE;
1613 return ConvertSDigits();
1617 //_____________________________________________________________________________
1618 Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector)
1621 // Checks whether a detector is enabled
1624 if ((fTRD->GetSensChamber() >= 0) &&
1625 (fTRD->GetSensChamber() != chamber)) return kFALSE;
1626 if ((fTRD->GetSensPlane() >= 0) &&
1627 (fTRD->GetSensPlane() != plane)) return kFALSE;
1628 if ( fTRD->GetSensSector() >= 0) {
1629 Int_t sens1 = fTRD->GetSensSector();
1630 Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
1631 sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
1632 * AliTRDgeometry::Nsect();
1633 if (sens1 < sens2) {
1634 if ((sector < sens1) || (sector >= sens2)) return kFALSE;
1637 if ((sector < sens1) && (sector >= sens2)) return kFALSE;
1645 //_____________________________________________________________________________
1646 Bool_t AliTRDdigitizer::WriteDigits()
1649 // Writes out the TRD-digits and the dictionaries
1652 // Store the digits and the dictionary in the tree
1653 return fDigitsManager->WriteDigits();
1657 //_____________________________________________________________________________
1658 Float_t AliTRDdigitizer::GetDiffusionL(Float_t vd, Float_t b)
1661 // Returns the longitudinal diffusion coefficient for a given drift
1662 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1663 // The values are according to a GARFIELD simulation.
1666 const Int_t kNb = 5;
1667 Float_t p0[kNb] = { 0.007440, 0.007493, 0.007513, 0.007672, 0.007831 };
1668 Float_t p1[kNb] = { 0.019252, 0.018912, 0.018636, 0.018012, 0.017343 };
1669 Float_t p2[kNb] = { -0.005042, -0.004926, -0.004867, -0.004650, -0.004424 };
1670 Float_t p3[kNb] = { 0.000195, 0.000189, 0.000195, 0.000182, 0.000169 };
1672 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1673 ib = TMath::Max( 0,ib);
1674 ib = TMath::Min(kNb,ib);
1676 Float_t diff = p0[ib]
1679 + p3[ib] * vd*vd*vd;
1685 //_____________________________________________________________________________
1686 Float_t AliTRDdigitizer::GetDiffusionT(Float_t vd, Float_t b)
1689 // Returns the transverse diffusion coefficient for a given drift
1690 // velocity <vd> and a B-field <b> for Xe/CO2 (15%).
1691 // The values are according to a GARFIELD simulation.
1694 const Int_t kNb = 5;
1695 Float_t p0[kNb] = { 0.009550, 0.009599, 0.009674, 0.009757, 0.009850 };
1696 Float_t p1[kNb] = { 0.006667, 0.006539, 0.006359, 0.006153, 0.005925 };
1697 Float_t p2[kNb] = { -0.000853, -0.000798, -0.000721, -0.000635, -0.000541 };
1698 Float_t p3[kNb] = { 0.000131, 0.000122, 0.000111, 0.000098, 0.000085 };
1700 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1701 ib = TMath::Max( 0,ib);
1702 ib = TMath::Min(kNb,ib);
1704 Float_t diff = p0[ib]
1707 + p3[ib] * vd*vd*vd;
1713 //_____________________________________________________________________________
1714 Float_t AliTRDdigitizer::GetOmegaTau(Float_t vd, Float_t b)
1717 // Returns omega*tau (tan(Lorentz-angle)) for a given drift velocity <vd>
1718 // and a B-field <b> for Xe/CO2 (15%).
1719 // The values are according to a GARFIELD simulation.
1722 const Int_t kNb = 5;
1723 Float_t p0[kNb] = { 0.004810, 0.007412, 0.010252, 0.013409, 0.016888 };
1724 Float_t p1[kNb] = { 0.054875, 0.081534, 0.107333, 0.131983, 0.155455 };
1725 Float_t p2[kNb] = { -0.008682, -0.012896, -0.016987, -0.020880, -0.024623 };
1726 Float_t p3[kNb] = { 0.000155, 0.000238, 0.000330, 0.000428, 0.000541 };
1728 Int_t ib = ((Int_t) (10 * (b - 0.15)));
1729 ib = TMath::Max( 0,ib);
1730 ib = TMath::Min(kNb,ib);
1732 Float_t alphaL = p0[ib]
1735 + p3[ib] * vd*vd*vd;
1737 return TMath::Tan(alphaL);