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 ////////////////////////////////////////////////////////////////////////////
20 // Class containing constant simulation parameters //
22 // Request an instance with AliTRDSimParam::Instance() //
23 // Then request the needed values //
25 ////////////////////////////////////////////////////////////////////////////
31 #include "AliTRDSimParam.h"
33 ClassImp(AliTRDSimParam)
35 AliTRDSimParam *AliTRDSimParam::fgInstance = 0;
36 Bool_t AliTRDSimParam::fgTerminated = kFALSE;
38 //_ singleton implementation __________________________________________________
39 AliTRDSimParam* AliTRDSimParam::Instance()
42 // Singleton implementation
43 // Returns an instance of this class, it is created if neccessary
46 if (fgTerminated != kFALSE) {
50 if (fgInstance == 0) {
51 fgInstance = new AliTRDSimParam();
58 //_ singleton implementation __________________________________________________
59 void AliTRDSimParam::Terminate()
62 // Singleton implementation
63 // Deletes the instance of this class and sets the terminated flag,
64 // instances cannot be requested anymore
65 // This function can be called several times.
70 if (fgInstance != 0) {
77 //_____________________________________________________________________________
78 AliTRDSimParam::AliTRDSimParam()
97 ,fAnodeWireOffset(0.0)
100 ,fTimeStructOn(kFALSE)
105 // Default constructor
112 //_____________________________________________________________________________
113 void AliTRDSimParam::Init()
116 // Default initializiation
119 // The default parameter for the digitization
123 fADCoutRange = 1023.0; // 10-bit ADC
124 fADCinRange = 2000.0; // 2V input range
125 // Go back to 0 again, just to be consistent with reconstruction
130 fDiffusionOn = kTRUE;
132 // Propability for electron attachment
133 fElAttachOn = kFALSE;
136 // The time response function
142 // The pad coupling factor
143 // Use 0.46, instead of the theroetical value 0.3, since it reproduces better
144 // the test beam data, even tough it is not understood why.
147 // The time coupling factor (same number as for the TPC)
150 // Distance of first Anode wire from first pad edge
151 fAnodeWireOffset = 0.25;
153 // Use drift time maps
154 fTimeStructOn = kTRUE;
156 // The pad response function
159 // The gas mixture, default Xenon
160 fGasMixture = kXenon;
166 //_____________________________________________________________________________
167 AliTRDSimParam::~AliTRDSimParam()
185 //_____________________________________________________________________________
186 AliTRDSimParam::AliTRDSimParam(const AliTRDSimParam &p)
188 ,fGasGain(p.fGasGain)
190 ,fChipGain(p.fChipGain)
191 ,fADCoutRange(p.fADCoutRange)
192 ,fADCinRange(p.fADCinRange)
193 ,fADCbaseline(p.fADCbaseline)
194 ,fDiffusionOn(p.fDiffusionOn)
195 ,fElAttachOn(p.fElAttachOn)
196 ,fElAttachProp(p.fElAttachProp)
205 ,fAnodeWireOffset(p.fAnodeWireOffset)
206 ,fPadCoupling(p.fPadCoupling)
207 ,fTimeCoupling(p.fTimeCoupling)
208 ,fTimeStructOn(p.fTimeStructOn)
210 ,fGasMixture(p.fGasMixture)
218 if (((AliTRDSimParam &) p).fTRFsmp) {
219 delete [] ((AliTRDSimParam &) p).fTRFsmp;
221 ((AliTRDSimParam &) p).fTRFsmp = new Float_t[fTRFbin];
222 for (iBin = 0; iBin < fTRFbin; iBin++) {
223 ((AliTRDSimParam &) p).fTRFsmp[iBin] = fTRFsmp[iBin];
226 if (((AliTRDSimParam &) p).fCTsmp) {
227 delete [] ((AliTRDSimParam &) p).fCTsmp;
229 ((AliTRDSimParam &) p).fCTsmp = new Float_t[fTRFbin];
230 for (iBin = 0; iBin < fTRFbin; iBin++) {
231 ((AliTRDSimParam &) p).fCTsmp[iBin] = fCTsmp[iBin];
236 //_____________________________________________________________________________
237 AliTRDSimParam &AliTRDSimParam::operator=(const AliTRDSimParam &p)
240 // Assignment operator
244 ((AliTRDSimParam &) p).Copy(*this);
251 //_____________________________________________________________________________
252 void AliTRDSimParam::Copy(TObject &p) const
258 AliTRDSimParam *target = dynamic_cast<AliTRDSimParam *> (&p);
263 target->fGasGain = fGasGain;
264 target->fNoise = fNoise;
265 target->fChipGain = fChipGain;
266 target->fADCoutRange = fADCoutRange;
267 target->fADCinRange = fADCinRange;
268 target->fADCbaseline = fADCbaseline;
269 target->fDiffusionOn = fDiffusionOn;
270 target->fElAttachOn = fElAttachOn;
271 target->fElAttachProp = fElAttachProp;
272 target->fTRFOn = fTRFOn;
273 target->fTRFbin = fTRFbin;
274 target->fTRFlo = fTRFlo;
275 target->fTRFhi = fTRFhi;
276 target->fTRFwid = fTRFwid;
277 target->fCTOn = fCTOn;
278 target->fAnodeWireOffset = fAnodeWireOffset;
279 target->fPadCoupling = fPadCoupling;
280 target->fTimeCoupling = fTimeCoupling;
281 target->fPRFOn = fPRFOn;
282 target->fGasMixture = fGasMixture;
284 if (target->fTRFsmp) {
285 delete[] target->fTRFsmp;
287 target->fTRFsmp = new Float_t[fTRFbin];
288 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
289 target->fTRFsmp[iBin] = fTRFsmp[iBin];
292 if (target->fCTsmp) {
293 delete[] target->fCTsmp;
295 target->fCTsmp = new Float_t[fTRFbin];
296 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
297 target->fCTsmp[iBin] = fCTsmp[iBin];
302 //_____________________________________________________________________________
303 void AliTRDSimParam::ReInit()
306 // Reinitializes the parameter class after a change
309 if (fGasMixture == kXenon) {
310 // The range and the binwidth for the sampled TRF
312 // Start 0.2 mus before the signal
314 // End the maximum drift time after the signal
319 else if (fGasMixture == kArgon) {
320 // The range and the binwidth for the sampled TRF
322 // Start 0.2 mus before the signal
324 // End the maximum drift time after the signal
330 AliFatal("Not a valid gas mixture!");
333 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
335 // Create the sampled TRF
340 //_____________________________________________________________________________
341 void AliTRDSimParam::SampleTRF()
344 // Samples the new time response function.
350 // From Antons measurements with Fe55 source, adjusted by C. Lippmann.
351 // time bins are -0.4, -0.38, -0.36, ...., 3.54, 3.56, 3.58 microseconds
352 const Int_t kNpasa = 200; // kNpasa should be equal to fTRFbin!
353 Float_t xtalk[kNpasa];
354 Float_t signal[kNpasa] = { 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000
355 , 0.0002, 0.0007, 0.0026, 0.0089, 0.0253, 0.0612, 0.1319
356 , 0.2416, 0.3913, 0.5609, 0.7295, 0.8662, 0.9581, 1.0000
357 , 0.9990, 0.9611, 0.8995, 0.8269, 0.7495, 0.6714, 0.5987
358 , 0.5334, 0.4756, 0.4249, 0.3811, 0.3433, 0.3110, 0.2837
359 , 0.2607, 0.2409, 0.2243, 0.2099, 0.1974, 0.1868, 0.1776
360 , 0.1695, 0.1627, 0.1566, 0.1509, 0.1457, 0.1407, 0.1362
361 , 0.1317, 0.1274, 0.1233, 0.1196, 0.1162, 0.1131, 0.1102
362 , 0.1075, 0.1051, 0.1026, 0.1004, 0.0979, 0.0956, 0.0934
363 , 0.0912, 0.0892, 0.0875, 0.0858, 0.0843, 0.0829, 0.0815
364 , 0.0799, 0.0786, 0.0772, 0.0757, 0.0741, 0.0729, 0.0718
365 , 0.0706, 0.0692, 0.0680, 0.0669, 0.0655, 0.0643, 0.0630
366 , 0.0618, 0.0607, 0.0596, 0.0587, 0.0576, 0.0568, 0.0558
367 , 0.0550, 0.0541, 0.0531, 0.0522, 0.0513, 0.0505, 0.0497
368 , 0.0490, 0.0484, 0.0474, 0.0465, 0.0457, 0.0449, 0.0441
369 , 0.0433, 0.0425, 0.0417, 0.0410, 0.0402, 0.0395, 0.0388
370 , 0.0381, 0.0374, 0.0368, 0.0361, 0.0354, 0.0348, 0.0342
371 , 0.0336, 0.0330, 0.0324, 0.0318, 0.0312, 0.0306, 0.0301
372 , 0.0296, 0.0290, 0.0285, 0.0280, 0.0275, 0.0270, 0.0265
373 , 0.0260, 0.0256, 0.0251, 0.0246, 0.0242, 0.0238, 0.0233
374 , 0.0229, 0.0225, 0.0221, 0.0217, 0.0213, 0.0209, 0.0206
375 , 0.0202, 0.0198, 0.0195, 0.0191, 0.0188, 0.0184, 0.0181
376 , 0.0178, 0.0175, 0.0171, 0.0168, 0.0165, 0.0162, 0.0159
377 , 0.0157, 0.0154, 0.0151, 0.0148, 0.0146, 0.0143, 0.0140
378 , 0.0138, 0.0135, 0.0133, 0.0131, 0.0128, 0.0126, 0.0124
379 , 0.0121, 0.0119, 0.0120, 0.0115, 0.0113, 0.0111, 0.0109
380 , 0.0107, 0.0105, 0.0103, 0.0101, 0.0100, 0.0098, 0.0096
381 , 0.0094, 0.0092, 0.0091, 0.0089, 0.0088, 0.0086, 0.0084
382 , 0.0083, 0.0081, 0.0080, 0.0078 };
386 // With undershoot, positive peak corresponds to ~3% of the main signal:
387 for (ipasa = 3; ipasa < kNpasa; ipasa++) {
388 xtalk[ipasa] = 0.2 * (signal[ipasa-2] - signal[ipasa-3]);
395 // Ar measurement with Fe55 source by Anton
396 // time bins are 0.02, 0.06, 0.10, ...., 1.90, 1.94, 1.98 microseconds
397 const Int_t kNpasaAr = 50;
398 Float_t xtalkAr[kNpasaAr];
399 Float_t signalAr[kNpasaAr] = { -0.01, 0.01, 0.00, 0.00, 0.01
400 , -0.01, 0.01, 2.15, 22.28, 55.53
401 , 68.52, 58.21, 40.92, 27.12, 18.49
402 , 13.42, 10.48, 8.67, 7.49, 6.55
403 , 5.71, 5.12, 4.63, 4.22, 3.81
404 , 3.48, 3.20, 2.94, 2.77, 2.63
405 , 2.50, 2.37, 2.23, 2.13, 2.03
406 , 1.91, 1.83, 1.75, 1.68, 1.63
407 , 1.56, 1.49, 1.50, 1.49, 1.29
408 , 1.19, 1.21, 1.21, 1.20, 1.10 };
409 // Normalization to maximum
410 for (ipasa = 0; ipasa < kNpasaAr; ipasa++) {
411 signalAr[ipasa] /= 68.52;
416 // With undershoot, positive peak corresponds to ~3% of the main signal:
417 for (ipasa = 3; ipasa < kNpasaAr; ipasa++) {
418 xtalkAr[ipasa] = 0.2 * (signalAr[ipasa-2] - signalAr[ipasa-3]);
427 fTRFsmp = new Float_t[fTRFbin];
432 fCTsmp = new Float_t[fTRFbin];
434 if (fGasMixture == kXenon) {
435 if (fTRFbin != kNpasa) {
436 AliError("Array mismatch (xenon)\n\n");
439 else if (fGasMixture == kArgon) {
440 if (fTRFbin != kNpasaAr) {
441 AliError("Array mismatch (argon)\n\n");
445 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
446 if (fGasMixture == kXenon) {
447 fTRFsmp[iBin] = signal[iBin];
448 fCTsmp[iBin] = xtalk[iBin];
450 else if (fGasMixture == kArgon) {
451 fTRFsmp[iBin] = signalAr[iBin];
452 fCTsmp[iBin] = xtalkAr[iBin];
458 //_____________________________________________________________________________
459 Double_t AliTRDSimParam::TimeResponse(Double_t time) const
462 // Applies the preamp shaper time response
463 // (We assume a signal rise time of 0.2us = fTRFlo/2.
466 Int_t iBin = ((Int_t) ((time - fTRFlo/2.0) / fTRFwid));
469 return fTRFsmp[iBin];
477 //_____________________________________________________________________________
478 Double_t AliTRDSimParam::CrossTalk(Double_t time) const
481 // Applies the pad-pad capacitive cross talk
484 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));