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)
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 // Distance of first Anode wire from first pad edge
150 fAnodeWireOffset = 0.25;
152 // Use drift time maps
153 fTimeStructOn = kTRUE;
155 // The pad response function
162 //_____________________________________________________________________________
163 AliTRDSimParam::~AliTRDSimParam()
181 //_____________________________________________________________________________
182 AliTRDSimParam::AliTRDSimParam(const AliTRDSimParam &p)
184 ,fGasGain(p.fGasGain)
186 ,fChipGain(p.fChipGain)
187 ,fADCoutRange(p.fADCoutRange)
188 ,fADCinRange(p.fADCinRange)
189 ,fADCbaseline(p.fADCbaseline)
190 ,fDiffusionOn(p.fDiffusionOn)
191 ,fElAttachOn(p.fElAttachOn)
192 ,fElAttachProp(p.fElAttachProp)
201 ,fAnodeWireOffset(p.fAnodeWireOffset)
202 ,fPadCoupling(p.fPadCoupling)
203 ,fTimeCoupling(p.fTimeCoupling)
204 ,fTimeStructOn(p.fTimeStructOn)
213 if (((AliTRDSimParam &) p).fTRFsmp) {
214 delete [] ((AliTRDSimParam &) p).fTRFsmp;
216 ((AliTRDSimParam &) p).fTRFsmp = new Float_t[fTRFbin];
217 for (iBin = 0; iBin < fTRFbin; iBin++) {
218 ((AliTRDSimParam &) p).fTRFsmp[iBin] = fTRFsmp[iBin];
221 if (((AliTRDSimParam &) p).fCTsmp) {
222 delete [] ((AliTRDSimParam &) p).fCTsmp;
224 ((AliTRDSimParam &) p).fCTsmp = new Float_t[fTRFbin];
225 for (iBin = 0; iBin < fTRFbin; iBin++) {
226 ((AliTRDSimParam &) p).fCTsmp[iBin] = fCTsmp[iBin];
231 //_____________________________________________________________________________
232 AliTRDSimParam &AliTRDSimParam::operator=(const AliTRDSimParam &p)
235 // Assignment operator
239 ((AliTRDSimParam &) p).Copy(*this);
246 //_____________________________________________________________________________
247 void AliTRDSimParam::Copy(TObject &p) const
253 AliTRDSimParam *target = dynamic_cast<AliTRDSimParam *> (&p);
258 target->fGasGain = fGasGain;
259 target->fNoise = fNoise;
260 target->fChipGain = fChipGain;
261 target->fADCoutRange = fADCoutRange;
262 target->fADCinRange = fADCinRange;
263 target->fADCbaseline = fADCbaseline;
264 target->fDiffusionOn = fDiffusionOn;
265 target->fElAttachOn = fElAttachOn;
266 target->fElAttachProp = fElAttachProp;
267 target->fTRFOn = fTRFOn;
268 target->fTRFbin = fTRFbin;
269 target->fTRFlo = fTRFlo;
270 target->fTRFhi = fTRFhi;
271 target->fTRFwid = fTRFwid;
272 target->fCTOn = fCTOn;
273 target->fAnodeWireOffset = fAnodeWireOffset;
274 target->fPadCoupling = fPadCoupling;
275 target->fTimeCoupling = fTimeCoupling;
276 target->fPRFOn = fPRFOn;
278 if (target->fTRFsmp) {
279 delete[] target->fTRFsmp;
281 target->fTRFsmp = new Float_t[fTRFbin];
282 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
283 target->fTRFsmp[iBin] = fTRFsmp[iBin];
286 if (target->fCTsmp) {
287 delete[] target->fCTsmp;
289 target->fCTsmp = new Float_t[fTRFbin];
290 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
291 target->fCTsmp[iBin] = fCTsmp[iBin];
296 //_____________________________________________________________________________
297 void AliTRDSimParam::ReInit()
300 // Reinitializes the parameter class after a change
303 // The range and the binwidth for the sampled TRF
305 // Start 0.2 mus before the signal
307 // End the maximum drift time after the signal
309 fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
311 // Create the sampled TRF
316 //_____________________________________________________________________________
317 void AliTRDSimParam::SampleTRF()
320 // Samples the new time response function.
321 // From Antons measurements with Fe55 source, adjusted by C. Lippmann.
322 // time bins are -0.4, -0.38, -0.36, ...., 3.54, 3.56, 3.58 microseconds
325 const Int_t kNpasa = 200; // kNpasa should be equal to fTRFbin!
327 Float_t signal[kNpasa]={ 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000
328 , 0.0002, 0.0007, 0.0026, 0.0089, 0.0253, 0.0612, 0.1319
329 , 0.2416, 0.3913, 0.5609, 0.7295, 0.8662, 0.9581, 1.0000
330 , 0.9990, 0.9611, 0.8995, 0.8269, 0.7495, 0.6714, 0.5987
331 , 0.5334, 0.4756, 0.4249, 0.3811, 0.3433, 0.3110, 0.2837
332 , 0.2607, 0.2409, 0.2243, 0.2099, 0.1974, 0.1868, 0.1776
333 , 0.1695, 0.1627, 0.1566, 0.1509, 0.1457, 0.1407, 0.1362
334 , 0.1317, 0.1274, 0.1233, 0.1196, 0.1162, 0.1131, 0.1102
335 , 0.1075, 0.1051, 0.1026, 0.1004, 0.0979, 0.0956, 0.0934
336 , 0.0912, 0.0892, 0.0875, 0.0858, 0.0843, 0.0829, 0.0815
337 , 0.0799, 0.0786, 0.0772, 0.0757, 0.0741, 0.0729, 0.0718
338 , 0.0706, 0.0692, 0.0680, 0.0669, 0.0655, 0.0643, 0.0630
339 , 0.0618, 0.0607, 0.0596, 0.0587, 0.0576, 0.0568, 0.0558
340 , 0.0550, 0.0541, 0.0531, 0.0522, 0.0513, 0.0505, 0.0497
341 , 0.0490, 0.0484, 0.0474, 0.0465, 0.0457, 0.0449, 0.0441
342 , 0.0433, 0.0425, 0.0417, 0.0410, 0.0402, 0.0395, 0.0388
343 , 0.0381, 0.0374, 0.0368, 0.0361, 0.0354, 0.0348, 0.0342
344 , 0.0336, 0.0330, 0.0324, 0.0318, 0.0312, 0.0306, 0.0301
345 , 0.0296, 0.0290, 0.0285, 0.0280, 0.0275, 0.0270, 0.0265
346 , 0.0260, 0.0256, 0.0251, 0.0246, 0.0242, 0.0238, 0.0233
347 , 0.0229, 0.0225, 0.0221, 0.0217, 0.0213, 0.0209, 0.0206
348 , 0.0202, 0.0198, 0.0195, 0.0191, 0.0188, 0.0184, 0.0181
349 , 0.0178, 0.0175, 0.0171, 0.0168, 0.0165, 0.0162, 0.0159
350 , 0.0157, 0.0154, 0.0151, 0.0148, 0.0146, 0.0143, 0.0140
351 , 0.0138, 0.0135, 0.0133, 0.0131, 0.0128, 0.0126, 0.0124
352 , 0.0121, 0.0119, 0.0120, 0.0115, 0.0113, 0.0111, 0.0109
353 , 0.0107, 0.0105, 0.0103, 0.0101, 0.0100, 0.0098, 0.0096
354 , 0.0094, 0.0092, 0.0091, 0.0089, 0.0088, 0.0086, 0.0084
355 , 0.0083, 0.0081, 0.0080, 0.0078 };
357 // // Andronic & Bercuci parametrization
358 // // define new TRF parametrization
359 // // normalizing constant to Fe signal
360 // const Float_t k1=1.055;
362 // const Float_t t1=0.04;
363 // const Float_t t2=.9;
364 // // the relative fraction of the long component
365 // const Float_t k2=.15;
366 // // time offset for Fe
367 // const Float_t t0=-.29;
368 // Float_t x = t0; Int_t index;
369 // for(int i=0; i<kNpasa; i++) signal[i] = 0.;
370 // for(int i=0; i<kNpasa; i++){
372 // if(index >= kNpasa) break;
374 // signal[index]=k1*(TMath::Power((x-t0)/t1, 2.5)*(exp(-(x-t0)/t1))+k2*exp(-(x-t0)/t2));
377 Float_t xtalk[kNpasa];
379 // With undershoot, positive peak corresponds to ~3% of the main signal:
380 for (Int_t ipasa = 3; ipasa < kNpasa; ipasa++) {
381 xtalk[ipasa] = 0.2 * (signal[ipasa-2] - signal[ipasa-3]);
395 fTRFsmp = new Float_t[fTRFbin];
400 fCTsmp = new Float_t[fTRFbin];
402 for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
403 fTRFsmp[iBin] = signal[iBin];
404 fCTsmp[iBin] = xtalk[iBin];
409 //_____________________________________________________________________________
410 Double_t AliTRDSimParam::TimeResponse(Double_t time) const
413 // Applies the preamp shaper time response
414 // (We assume a signal rise time of 0.2us = fTRFlo/2.
417 Int_t iBin = ((Int_t) ((time - fTRFlo/2.0) / fTRFwid));
420 return fTRFsmp[iBin];
428 //_____________________________________________________________________________
429 Double_t AliTRDSimParam::CrossTalk(Double_t time) const
432 // Applies the pad-pad capacitive cross talk
435 Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid));