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"
32 #include "AliTRDCommonParam.h"
34 ClassImp(AliTRDSimParam)
36 AliTRDSimParam *AliTRDSimParam::fgInstance = 0;
37 Bool_t AliTRDSimParam::fgTerminated = kFALSE;
39 //_ singleton implementation __________________________________________________
40 AliTRDSimParam* AliTRDSimParam::Instance()
43 // Singleton implementation
44 // Returns an instance of this class, it is created if neccessary
47 if (fgTerminated != kFALSE) {
51 if (fgInstance == 0) {
52 fgInstance = new AliTRDSimParam();
59 //_ singleton implementation __________________________________________________
60 void AliTRDSimParam::Terminate()
63 // Singleton implementation
64 // Deletes the instance of this class and sets the terminated flag,
65 // instances cannot be requested anymore
66 // This function can be called several times.
71 if (fgInstance != 0) {
78 //_____________________________________________________________________________
79 AliTRDSimParam::AliTRDSimParam()
100 ,fTimeStructOn(kFALSE)
104 // Default constructor
111 //_____________________________________________________________________________
112 void AliTRDSimParam::Init()
115 // Default initializiation
118 // The default parameter for the digitization
122 fADCoutRange = 1023.0; // 10-bit ADC
123 fADCinRange = 2000.0; // 2V input range
124 // Go back to 0 again, just to be consistent with reconstruction
129 fDiffusionOn = kTRUE;
131 // Propability for electron attachment
132 fElAttachOn = kFALSE;
135 // The time response function
141 // The pad coupling factor
142 // Use 0.46, instead of the theroetical value 0.3, since it reproduces better
143 // the test beam data, even tough it is not understood why.
146 // The time coupling factor (same number as for the TPC)
149 // Use drift time maps
150 fTimeStructOn = kTRUE;
152 // The pad response function
159 //_____________________________________________________________________________
160 AliTRDSimParam::~AliTRDSimParam()
178 //_____________________________________________________________________________
179 AliTRDSimParam::AliTRDSimParam(const AliTRDSimParam &p)
181 ,fGasGain(p.fGasGain)
183 ,fChipGain(p.fChipGain)
184 ,fADCoutRange(p.fADCoutRange)
185 ,fADCinRange(p.fADCinRange)
186 ,fADCbaseline(p.fADCbaseline)
187 ,fDiffusionOn(p.fDiffusionOn)
188 ,fElAttachOn(p.fElAttachOn)
189 ,fElAttachProp(p.fElAttachProp)
198 ,fPadCoupling(p.fPadCoupling)
199 ,fTimeCoupling(p.fTimeCoupling)
200 ,fTimeStructOn(p.fTimeStructOn)
209 if (((AliTRDSimParam &) p).fTRFsmp) {
210 delete [] ((AliTRDSimParam &) p).fTRFsmp;
212 ((AliTRDSimParam &) p).fTRFsmp = new Float_t[fTRFbin];
213 for (iBin = 0; iBin < fTRFbin; iBin++) {
214 ((AliTRDSimParam &) p).fTRFsmp[iBin] = fTRFsmp[iBin];
217 if (((AliTRDSimParam &) p).fCTsmp) {
218 delete [] ((AliTRDSimParam &) p).fCTsmp;
220 ((AliTRDSimParam &) p).fCTsmp = new Float_t[fTRFbin];
221 for (iBin = 0; iBin < fTRFbin; iBin++) {
222 ((AliTRDSimParam &) p).fCTsmp[iBin] = fCTsmp[iBin];
227 //_____________________________________________________________________________
228 AliTRDSimParam &AliTRDSimParam::operator=(const AliTRDSimParam &p)
231 // Assignment operator
235 ((AliTRDSimParam &) p).Copy(*this);
242 //_____________________________________________________________________________
243 void AliTRDSimParam::Copy(TObject &p) const
249 AliTRDSimParam *target = dynamic_cast<AliTRDSimParam *> (&p);
254 target->fGasGain = fGasGain;
255 target->fNoise = fNoise;
256 target->fChipGain = fChipGain;
257 target->fADCoutRange = fADCoutRange;
258 target->fADCinRange = fADCinRange;
259 target->fADCbaseline = fADCbaseline;
260 target->fDiffusionOn = fDiffusionOn;
261 target->fElAttachOn = fElAttachOn;
262 target->fElAttachProp = fElAttachProp;
263 target->fTRFOn = fTRFOn;
264 target->fTRFbin = fTRFbin;
265 target->fTRFlo = fTRFlo;
266 target->fTRFhi = fTRFhi;
267 target->fTRFwid = fTRFwid;
268 target->fCTOn = fCTOn;
269 target->fPadCoupling = fPadCoupling;
270 target->fTimeCoupling = fTimeCoupling;
271 target->fPRFOn = fPRFOn;
273 if (target->fTRFsmp) {
274 delete[] target->fTRFsmp;
276 target->fTRFsmp = new Float_t[fTRFbin];
277 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
278 target->fTRFsmp[iBin] = fTRFsmp[iBin];
281 if (target->fCTsmp) {
282 delete[] target->fCTsmp;
284 target->fCTsmp = new Float_t[fTRFbin];
285 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
286 target->fCTsmp[iBin] = fCTsmp[iBin];
291 //_____________________________________________________________________________
292 void AliTRDSimParam::ReInit()
295 // Reinitializes the parameter class after a change
298 if (AliTRDCommonParam::Instance()->IsXenon()) {
299 // The range and the binwidth for the sampled TRF
301 // Start 0.2 mus before the signal
303 // End the maximum drift time after the signal
308 else if (AliTRDCommonParam::Instance()->IsArgon()) {
309 // The range and the binwidth for the sampled TRF
311 // Start 0.2 mus before the signal
313 // End the maximum drift time after the signal
319 AliFatal("Not a valid gas mixture!");
322 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
324 // Create the sampled TRF
329 //_____________________________________________________________________________
330 void AliTRDSimParam::SampleTRF()
333 // Samples the new time response function.
339 // From Antons measurements with Fe55 source, adjusted by C. Lippmann.
340 // time bins are -0.4, -0.38, -0.36, ...., 3.54, 3.56, 3.58 microseconds
341 const Int_t kNpasa = 200; // kNpasa should be equal to fTRFbin!
342 Float_t xtalk[kNpasa];
343 Float_t signal[kNpasa] = { 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000
344 , 0.0002, 0.0007, 0.0026, 0.0089, 0.0253, 0.0612, 0.1319
345 , 0.2416, 0.3913, 0.5609, 0.7295, 0.8662, 0.9581, 1.0000
346 , 0.9990, 0.9611, 0.8995, 0.8269, 0.7495, 0.6714, 0.5987
347 , 0.5334, 0.4756, 0.4249, 0.3811, 0.3433, 0.3110, 0.2837
348 , 0.2607, 0.2409, 0.2243, 0.2099, 0.1974, 0.1868, 0.1776
349 , 0.1695, 0.1627, 0.1566, 0.1509, 0.1457, 0.1407, 0.1362
350 , 0.1317, 0.1274, 0.1233, 0.1196, 0.1162, 0.1131, 0.1102
351 , 0.1075, 0.1051, 0.1026, 0.1004, 0.0979, 0.0956, 0.0934
352 , 0.0912, 0.0892, 0.0875, 0.0858, 0.0843, 0.0829, 0.0815
353 , 0.0799, 0.0786, 0.0772, 0.0757, 0.0741, 0.0729, 0.0718
354 , 0.0706, 0.0692, 0.0680, 0.0669, 0.0655, 0.0643, 0.0630
355 , 0.0618, 0.0607, 0.0596, 0.0587, 0.0576, 0.0568, 0.0558
356 , 0.0550, 0.0541, 0.0531, 0.0522, 0.0513, 0.0505, 0.0497
357 , 0.0490, 0.0484, 0.0474, 0.0465, 0.0457, 0.0449, 0.0441
358 , 0.0433, 0.0425, 0.0417, 0.0410, 0.0402, 0.0395, 0.0388
359 , 0.0381, 0.0374, 0.0368, 0.0361, 0.0354, 0.0348, 0.0342
360 , 0.0336, 0.0330, 0.0324, 0.0318, 0.0312, 0.0306, 0.0301
361 , 0.0296, 0.0290, 0.0285, 0.0280, 0.0275, 0.0270, 0.0265
362 , 0.0260, 0.0256, 0.0251, 0.0246, 0.0242, 0.0238, 0.0233
363 , 0.0229, 0.0225, 0.0221, 0.0217, 0.0213, 0.0209, 0.0206
364 , 0.0202, 0.0198, 0.0195, 0.0191, 0.0188, 0.0184, 0.0181
365 , 0.0178, 0.0175, 0.0171, 0.0168, 0.0165, 0.0162, 0.0159
366 , 0.0157, 0.0154, 0.0151, 0.0148, 0.0146, 0.0143, 0.0140
367 , 0.0138, 0.0135, 0.0133, 0.0131, 0.0128, 0.0126, 0.0124
368 , 0.0121, 0.0119, 0.0120, 0.0115, 0.0113, 0.0111, 0.0109
369 , 0.0107, 0.0105, 0.0103, 0.0101, 0.0100, 0.0098, 0.0096
370 , 0.0094, 0.0092, 0.0091, 0.0089, 0.0088, 0.0086, 0.0084
371 , 0.0083, 0.0081, 0.0080, 0.0078 };
375 // With undershoot, positive peak corresponds to ~3% of the main signal:
376 for (ipasa = 3; ipasa < kNpasa; ipasa++) {
377 xtalk[ipasa] = 0.2 * (signal[ipasa-2] - signal[ipasa-3]);
384 // Ar measurement with Fe55 source by Anton
385 // time bins are 0.02, 0.06, 0.10, ...., 1.90, 1.94, 1.98 microseconds
386 const Int_t kNpasaAr = 50;
387 Float_t xtalkAr[kNpasaAr];
388 Float_t signalAr[kNpasaAr] = { -0.01, 0.01, 0.00, 0.00, 0.01
389 , -0.01, 0.01, 2.15, 22.28, 55.53
390 , 68.52, 58.21, 40.92, 27.12, 18.49
391 , 13.42, 10.48, 8.67, 7.49, 6.55
392 , 5.71, 5.12, 4.63, 4.22, 3.81
393 , 3.48, 3.20, 2.94, 2.77, 2.63
394 , 2.50, 2.37, 2.23, 2.13, 2.03
395 , 1.91, 1.83, 1.75, 1.68, 1.63
396 , 1.56, 1.49, 1.50, 1.49, 1.29
397 , 1.19, 1.21, 1.21, 1.20, 1.10 };
398 // Normalization to maximum
399 for (ipasa = 0; ipasa < kNpasaAr; ipasa++) {
400 signalAr[ipasa] /= 68.52;
405 // With undershoot, positive peak corresponds to ~3% of the main signal:
406 for (ipasa = 3; ipasa < kNpasaAr; ipasa++) {
407 xtalkAr[ipasa] = 0.2 * (signalAr[ipasa-2] - signalAr[ipasa-3]);
416 fTRFsmp = new Float_t[fTRFbin];
421 fCTsmp = new Float_t[fTRFbin];
423 if (AliTRDCommonParam::Instance()->IsXenon()) {
424 if (fTRFbin != kNpasa) {
425 AliError("Array mismatch (xenon)\n\n");
428 else if (AliTRDCommonParam::Instance()->IsArgon()) {
429 if (fTRFbin != kNpasaAr) {
430 AliError("Array mismatch (argon)\n\n");
434 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
435 if (AliTRDCommonParam::Instance()->IsXenon()) {
436 fTRFsmp[iBin] = signal[iBin];
437 fCTsmp[iBin] = xtalk[iBin];
439 else if (AliTRDCommonParam::Instance()->IsArgon()) {
440 fTRFsmp[iBin] = signalAr[iBin];
441 fCTsmp[iBin] = xtalkAr[iBin];
447 //_____________________________________________________________________________
448 Double_t AliTRDSimParam::TimeResponse(Double_t time) const
451 // Applies the preamp shaper time response
452 // (We assume a signal rise time of 0.2us = fTRFlo/2.
455 Double_t rt = (time - .5*fTRFlo) / fTRFwid;
456 Int_t iBin = (Int_t) rt;
457 Double_t dt = rt - iBin;
458 if ((iBin >= 0) && (iBin+1 < fTRFbin)) {
459 return fTRFsmp[iBin] + (fTRFsmp[iBin+1] - fTRFsmp[iBin])*dt;
467 //_____________________________________________________________________________
468 Double_t AliTRDSimParam::CrossTalk(Double_t time) const
471 // Applies the pad-pad capacitive cross talk
474 Double_t rt = (time - fTRFlo) / fTRFwid;
475 Int_t iBin = (Int_t) rt;
476 Double_t dt = rt - iBin;
477 if ((iBin >= 0) && (iBin+1 < fTRFbin)) {
478 return fCTsmp[iBin] + (fCTsmp[iBin+1] - fCTsmp[iBin])*dt;