TRD/AliTRDSimParam.cxx

   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 /* $Id$ */
  17
  18 ////////////////////////////////////////////////////////////////////////////
  19 //                                                                        //
  20 // Class containing constant simulation parameters                        //
  21 //                                                                        //
  22 // Request an instance with AliTRDSimParam::Instance()                    //
  23 // Then request the needed values                                         //
  24 //                                                                        //
  25 ////////////////////////////////////////////////////////////////////////////
  26
  27 #include <TMath.h>
  28
  29 #include "AliRun.h"
  30
  31 #include "AliTRDSimParam.h"
  32 #include "AliTRDCommonParam.h"
  33 #include "AliLog.h"
  34
  35 ClassImp(AliTRDSimParam)
  36
  37 AliTRDSimParam *AliTRDSimParam::fgInstance   = 0;
  38 Bool_t          AliTRDSimParam::fgTerminated = kFALSE;
  39
  40 //_ singleton implementation __________________________________________________
  41 AliTRDSimParam* AliTRDSimParam::Instance()
  42 {
  43   //
  44   // Singleton implementation
  45   // Returns an instance of this class, it is created if neccessary
  46   //
  47
  48   if (fgTerminated != kFALSE) {
  49     return 0;
  50   }
  51
  52   if (fgInstance == 0) {
  53     fgInstance = new AliTRDSimParam();
  54   }
  55
  56   return fgInstance;
  57
  58 }
  59
  60 //_ singleton implementation __________________________________________________
  61 void AliTRDSimParam::Terminate()
  62 {
  63   //
  64   // Singleton implementation
  65   // Deletes the instance of this class and sets the terminated flag,
  66   // instances cannot be requested anymore
  67   // This function can be called several times.
  68   //
  69
  70   fgTerminated = kTRUE;
  71
  72   if (fgInstance != 0) {
  73     delete fgInstance;
  74     fgInstance = 0;
  75   }
  76
  77 }
  78
  79 //_____________________________________________________________________________
  80 AliTRDSimParam::AliTRDSimParam()
  81   :TObject()
  82   ,fGasGain(0.0)
  83   ,fNoise(0.0)
  84   ,fChipGain(0.0)
  85   ,fADCoutRange(0.0)
  86   ,fADCinRange(0.0)
  87   ,fADCbaseline(0)
  88   ,fDiffusionOn(kFALSE)
  89   ,fElAttachOn(kFALSE)
  90   ,fElAttachProp(0.0)
  91   ,fTRFOn(kFALSE)
  92   ,fTRFsmp(0)
  93   ,fTRFbin(0)
  94   ,fTRFlo(0.0)
  95   ,fTRFhi(0.0)
  96   ,fTRFwid(0.0)
  97   ,fCTOn(kFALSE)
  98   ,fCTsmp(0)
  99   ,fPadCoupling(0.0)
 100   ,fTimeCoupling(0.0)
 101   ,fTimeStructOn(kFALSE)
 102   ,fPRFOn(kFALSE)
 103   ,fNTimeBins(0)
 104   ,fNTBoverwriteOCDB(kFALSE)
 105 {
 106   //
 107   // Default constructor
 108   //
 109
 110   Init();
 111
 112 }
 113
 114 //_____________________________________________________________________________
 115 void AliTRDSimParam::Init()
 116 {
 117   //
 118   // Default initializiation
 119   //
 120
 121   // The default parameter for the digitization
 122   fGasGain           = 4000.0;
 123   fChipGain          =   12.4;
 124   fNoise             = 1250.0;
 125   fADCoutRange       = 1023.0;          // 10-bit ADC
 126   fADCinRange        = 2000.0;          // 2V input range
 127   fADCbaseline       =   10;
 128
 129   // Diffusion on
 130   fDiffusionOn       = kTRUE;
 131
 132   // Propability for electron attachment
 133   fElAttachOn        = kFALSE;
 134   fElAttachProp      = 0.0;
 135
 136   // The time response function
 137   fTRFOn             = kTRUE;
 138
 139   // The cross talk
 140   fCTOn              = kTRUE;
 141
 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.
 145   fPadCoupling       = 0.46;
 146
 147   // The time coupling factor (same number as for the TPC)
 148   fTimeCoupling      = 0.4;
 149
 150   // Use drift time maps
 151   fTimeStructOn      = kTRUE;
 152
 153   // The pad response function
 154   fPRFOn             = kTRUE;
 155
 156   // The number of time bins
 157   fNTimeBins         = 22;
 158   fNTBoverwriteOCDB  = kFALSE;
 159
 160   ReInit();
 161
 162 }
 163
 164 //_____________________________________________________________________________
 165 AliTRDSimParam::~AliTRDSimParam()
 166 {
 167   //
 168   // Destructor
 169   //
 170
 171   if (fTRFsmp) {
 172     delete [] fTRFsmp;
 173     fTRFsmp = 0;
 174   }
 175
 176   if (fCTsmp) {
 177     delete [] fCTsmp;
 178     fCTsmp  = 0;
 179   }
 180
 181 }
 182
 183 //_____________________________________________________________________________
 184 AliTRDSimParam::AliTRDSimParam(const AliTRDSimParam &p)
 185   :TObject(p)
 186   ,fGasGain(p.fGasGain)
 187   ,fNoise(p.fNoise)
 188   ,fChipGain(p.fChipGain)
 189   ,fADCoutRange(p.fADCoutRange)
 190   ,fADCinRange(p.fADCinRange)
 191   ,fADCbaseline(p.fADCbaseline)
 192   ,fDiffusionOn(p.fDiffusionOn)
 193   ,fElAttachOn(p.fElAttachOn)
 194   ,fElAttachProp(p.fElAttachProp)
 195   ,fTRFOn(p.fTRFOn)
 196   ,fTRFsmp(0)
 197   ,fTRFbin(p.fTRFbin)
 198   ,fTRFlo(p.fTRFlo)
 199   ,fTRFhi(p.fTRFhi)
 200   ,fTRFwid(p.fTRFwid)
 201   ,fCTOn(p.fCTOn)
 202   ,fCTsmp(0)
 203   ,fPadCoupling(p.fPadCoupling)
 204   ,fTimeCoupling(p.fTimeCoupling)
 205   ,fTimeStructOn(p.fTimeStructOn)
 206   ,fPRFOn(p.fPRFOn)
 207   ,fNTimeBins(p.fNTimeBins)
 208   ,fNTBoverwriteOCDB(p.fNTBoverwriteOCDB)
 209 {
 210   //
 211   // Copy constructor
 212   //
 213
 214   Int_t iBin = 0;
 215
 216   fTRFsmp = new Float_t[fTRFbin];
 217   for (iBin = 0; iBin < fTRFbin; iBin++) {
 218     fTRFsmp[iBin] = ((AliTRDSimParam &) p).fTRFsmp[iBin];
 219   }
 220
 221   fCTsmp  = new Float_t[fTRFbin];
 222   for (iBin = 0; iBin < fTRFbin; iBin++) {
 223     fCTsmp[iBin]  = ((AliTRDSimParam &) p).fCTsmp[iBin];
 224   }
 225
 226 }
 227
 228 //_____________________________________________________________________________
 229 AliTRDSimParam &AliTRDSimParam::operator=(const AliTRDSimParam &p)
 230 {
 231   //
 232   // Assignment operator
 233   //
 234
 235   if (this == &p) {
 236     return *this;
 237   }
 238
 239   Init();
 240
 241   fGasGain          = p.fGasGain;
 242   fNoise            = p.fNoise;
 243   fChipGain         = p.fChipGain;
 244   fADCoutRange      = p.fADCoutRange;
 245   fADCinRange       = p.fADCinRange;
 246   fADCbaseline      = p.fADCbaseline;
 247   fDiffusionOn      = p.fDiffusionOn;
 248   fElAttachOn       = p.fElAttachOn;
 249   fElAttachProp     = p.fElAttachProp;
 250   fTRFOn            = p.fTRFOn;
 251   fTRFsmp           = 0;
 252   fTRFbin           = p.fTRFbin;
 253   fTRFlo            = p.fTRFlo;
 254   fTRFhi            = p.fTRFhi;
 255   fTRFwid           = p.fTRFwid;
 256   fCTOn             = p.fCTOn;
 257   fCTsmp            = 0;
 258   fPadCoupling      = p.fPadCoupling;
 259   fTimeCoupling     = p.fTimeCoupling;
 260   fTimeStructOn     = p.fTimeStructOn;
 261   fPRFOn            = p.fPRFOn;
 262   fNTimeBins        = p.fNTimeBins;
 263   fNTBoverwriteOCDB = p.fNTBoverwriteOCDB;
 264
 265   Int_t iBin = 0;
 266
 267   if (fTRFsmp) {
 268     delete[] fTRFsmp;
 269   }
 270   fTRFsmp = new Float_t[fTRFbin];
 271   for (iBin = 0; iBin < fTRFbin; iBin++) {
 272     fTRFsmp[iBin] = ((AliTRDSimParam &) p).fTRFsmp[iBin];
 273   }
 274
 275   if (fCTsmp) {
 276     delete[] fCTsmp;
 277   }
 278   fCTsmp  = new Float_t[fTRFbin];
 279   for (iBin = 0; iBin < fTRFbin; iBin++) {
 280     fCTsmp[iBin]  = ((AliTRDSimParam &) p).fCTsmp[iBin];
 281   }
 282
 283   return *this;
 284
 285 }
 286
 287 //_____________________________________________________________________________
 288 void AliTRDSimParam::Copy(TObject &p) const
 289 {
 290   //
 291   // Copy function
 292   //
 293
 294   AliTRDSimParam *target = dynamic_cast<AliTRDSimParam *> (&p);
 295   if (!target) {
 296     return;
 297   }
 298
 299   target->fGasGain            = fGasGain;
 300   target->fNoise              = fNoise;
 301   target->fChipGain           = fChipGain;
 302   target->fADCoutRange        = fADCoutRange;
 303   target->fADCinRange         = fADCinRange;
 304   target->fADCbaseline        = fADCbaseline;
 305   target->fDiffusionOn        = fDiffusionOn;
 306   target->fElAttachOn         = fElAttachOn;
 307   target->fElAttachProp       = fElAttachProp;
 308   target->fTRFOn              = fTRFOn;
 309   target->fTRFbin             = fTRFbin;
 310   target->fTRFlo              = fTRFlo;
 311   target->fTRFhi              = fTRFhi;
 312   target->fTRFwid             = fTRFwid;
 313   target->fCTOn               = fCTOn;
 314   target->fPadCoupling        = fPadCoupling;
 315   target->fTimeCoupling       = fTimeCoupling;
 316   target->fPRFOn              = fPRFOn;
 317   target->fNTimeBins          = fNTimeBins;
 318   target->fNTBoverwriteOCDB   = fNTBoverwriteOCDB;
 319
 320   if (target->fTRFsmp) {
 321     delete[] target->fTRFsmp;
 322   }
 323   target->fTRFsmp = new Float_t[fTRFbin];
 324   for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
 325     target->fTRFsmp[iBin] = fTRFsmp[iBin];
 326   }
 327
 328   if (target->fCTsmp) {
 329     delete[] target->fCTsmp;
 330   }
 331   target->fCTsmp  = new Float_t[fTRFbin];
 332   for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
 333     target->fCTsmp[iBin]  = fCTsmp[iBin];
 334   }
 335
 336 }
 337
 338 //_____________________________________________________________________________
 339 void AliTRDSimParam::ReInit()
 340 {
 341   //
 342   // Reinitializes the parameter class after a change
 343   //
 344
 345   if      (AliTRDCommonParam::Instance()->IsXenon()) {
 346     // The range and the binwidth for the sampled TRF
 347     fTRFbin = 200;
 348     // Start 0.2 mus before the signal
 349     fTRFlo  = -0.4;
 350     // End the maximum drift time after the signal
 351     fTRFhi  =  3.58;
 352     // Standard gas gain
 353     fGasGain = 4000.0;
 354   }
 355   else if (AliTRDCommonParam::Instance()->IsArgon()) {
 356     // The range and the binwidth for the sampled TRF
 357     fTRFbin  =  50;
 358     // Start 0.2 mus before the signal
 359     fTRFlo   =  0.02;
 360     // End the maximum drift time after the signal
 361     fTRFhi   =  1.98;
 362     // Higher gas gain
 363     fGasGain = 8000.0;
 364   }
 365   else {
 366     AliFatal("Not a valid gas mixture!");
 367   }
 368   fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin);
 369
 370   // Create the sampled TRF
 371   SampleTRF();
 372
 373 }
 374
 375 //_____________________________________________________________________________
 376 void AliTRDSimParam::SampleTRF()
 377 {
 378   //
 379   // Samples the new time response function.
 380   //
 381
 382   Int_t ipasa = 0;
 383
 384   // Xenon
 385   // From Antons measurements with Fe55 source, adjusted by C. Lippmann.
 386   // time bins are -0.4, -0.38, -0.36, ...., 3.54, 3.56, 3.58 microseconds
 387   const Int_t kNpasa     = 200;  // kNpasa should be equal to fTRFbin!
 388   Float_t xtalk[kNpasa];
 389   Float_t signal[kNpasa]     = { 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000, 0.0000
 390                                , 0.0002, 0.0007, 0.0026, 0.0089, 0.0253, 0.0612, 0.1319
 391                                , 0.2416, 0.3913, 0.5609, 0.7295, 0.8662, 0.9581, 1.0000
 392                                , 0.9990, 0.9611, 0.8995, 0.8269, 0.7495, 0.6714, 0.5987
 393                                , 0.5334, 0.4756, 0.4249, 0.3811, 0.3433, 0.3110, 0.2837
 394                                , 0.2607, 0.2409, 0.2243, 0.2099, 0.1974, 0.1868, 0.1776
 395                                , 0.1695, 0.1627, 0.1566, 0.1509, 0.1457, 0.1407, 0.1362
 396                                , 0.1317, 0.1274, 0.1233, 0.1196, 0.1162, 0.1131, 0.1102
 397                                , 0.1075, 0.1051, 0.1026, 0.1004, 0.0979, 0.0956, 0.0934
 398                                , 0.0912, 0.0892, 0.0875, 0.0858, 0.0843, 0.0829, 0.0815
 399                                , 0.0799, 0.0786, 0.0772, 0.0757, 0.0741, 0.0729, 0.0718
 400                                , 0.0706, 0.0692, 0.0680, 0.0669, 0.0655, 0.0643, 0.0630
 401                                , 0.0618, 0.0607, 0.0596, 0.0587, 0.0576, 0.0568, 0.0558
 402                                , 0.0550, 0.0541, 0.0531, 0.0522, 0.0513, 0.0505, 0.0497
 403                                , 0.0490, 0.0484, 0.0474, 0.0465, 0.0457, 0.0449, 0.0441
 404                                , 0.0433, 0.0425, 0.0417, 0.0410, 0.0402, 0.0395, 0.0388
 405                                , 0.0381, 0.0374, 0.0368, 0.0361, 0.0354, 0.0348, 0.0342
 406                                , 0.0336, 0.0330, 0.0324, 0.0318, 0.0312, 0.0306, 0.0301
 407                                , 0.0296, 0.0290, 0.0285, 0.0280, 0.0275, 0.0270, 0.0265
 408                                , 0.0260, 0.0256, 0.0251, 0.0246, 0.0242, 0.0238, 0.0233
 409                                , 0.0229, 0.0225, 0.0221, 0.0217, 0.0213, 0.0209, 0.0206
 410                                , 0.0202, 0.0198, 0.0195, 0.0191, 0.0188, 0.0184, 0.0181
 411                                , 0.0178, 0.0175, 0.0171, 0.0168, 0.0165, 0.0162, 0.0159
 412                                , 0.0157, 0.0154, 0.0151, 0.0148, 0.0146, 0.0143, 0.0140
 413                                , 0.0138, 0.0135, 0.0133, 0.0131, 0.0128, 0.0126, 0.0124
 414                                , 0.0121, 0.0119, 0.0120, 0.0115, 0.0113, 0.0111, 0.0109
 415                                , 0.0107, 0.0105, 0.0103, 0.0101, 0.0100, 0.0098, 0.0096
 416                                , 0.0094, 0.0092, 0.0091, 0.0089, 0.0088, 0.0086, 0.0084
 417                                , 0.0083, 0.0081, 0.0080, 0.0078 };
 418   signal[0] = 0.0;
 419   signal[1] = 0.0;
 420   signal[2] = 0.0;
 421   // With undershoot, positive peak corresponds to ~3% of the main signal:
 422   for (ipasa = 3; ipasa < kNpasa; ipasa++) {
 423     xtalk[ipasa] = 0.2 * (signal[ipasa-2] - signal[ipasa-3]);
 424   }
 425   xtalk[0]  = 0.0;
 426   xtalk[1]  = 0.0;
 427   xtalk[2]  = 0.0;
 428
 429   // Argon
 430   // Ar measurement with Fe55 source by Anton
 431   // time bins are 0.02, 0.06, 0.10, ...., 1.90, 1.94, 1.98 microseconds
 432   const Int_t kNpasaAr = 50;
 433   Float_t xtalkAr[kNpasaAr];
 434   Float_t signalAr[kNpasaAr] = { -0.01,  0.01,  0.00,  0.00,  0.01
 435                                , -0.01,  0.01,  2.15, 22.28, 55.53
 436                                , 68.52, 58.21, 40.92, 27.12, 18.49
 437                                , 13.42, 10.48,  8.67,  7.49,  6.55
 438                                ,  5.71,  5.12,  4.63,  4.22,  3.81
 439                                ,  3.48,  3.20,  2.94,  2.77,  2.63
 440                                ,  2.50,  2.37,  2.23,  2.13,  2.03
 441                                ,  1.91,  1.83,  1.75,  1.68,  1.63
 442                                ,  1.56,  1.49,  1.50,  1.49,  1.29
 443                                ,  1.19,  1.21,  1.21,  1.20,  1.10 };
 444   // Normalization to maximum
 445   for (ipasa = 0; ipasa < kNpasaAr; ipasa++) {
 446     signalAr[ipasa] /= 68.52;
 447   }
 448   signalAr[0] = 0.0;
 449   signalAr[1] = 0.0;
 450   signalAr[2] = 0.0;
 451   // With undershoot, positive peak corresponds to ~3% of the main signal:
 452   for (ipasa = 3; ipasa < kNpasaAr; ipasa++) {
 453     xtalkAr[ipasa] = 0.2 * (signalAr[ipasa-2] - signalAr[ipasa-3]);
 454   }
 455   xtalkAr[0]  = 0.0;
 456   xtalkAr[1]  = 0.0;
 457   xtalkAr[2]  = 0.0;
 458
 459   if (fTRFsmp) {
 460     delete [] fTRFsmp;
 461   }
 462   fTRFsmp = new Float_t[fTRFbin];
 463
 464   if (fCTsmp)  {
 465     delete [] fCTsmp;
 466   }
 467   fCTsmp  = new Float_t[fTRFbin];
 468
 469   if      (AliTRDCommonParam::Instance()->IsXenon()) {
 470     if (fTRFbin != kNpasa) {
 471       AliError("Array mismatch (xenon)\n\n");
 472     }
 473   }
 474   else if (AliTRDCommonParam::Instance()->IsArgon()) {
 475     if (fTRFbin != kNpasaAr) {
 476       AliError("Array mismatch (argon)\n\n");
 477     }
 478   }
 479
 480   for (Int_t iBin = 0; iBin < fTRFbin; iBin++) {
 481     if      (AliTRDCommonParam::Instance()->IsXenon()) {
 482       fTRFsmp[iBin] = signal[iBin];
 483       fCTsmp[iBin]  = xtalk[iBin];
 484     }
 485     else if (AliTRDCommonParam::Instance()->IsArgon()) {
 486       fTRFsmp[iBin] = signalAr[iBin];
 487       fCTsmp[iBin]  = xtalkAr[iBin];
 488     }
 489   }
 490
 491 }
 492
 493 //_____________________________________________________________________________
 494 Double_t AliTRDSimParam::TimeResponse(Double_t time) const
 495 {
 496   //
 497   // Applies the preamp shaper time response
 498   // (We assume a signal rise time of 0.2us = fTRFlo/2.
 499   //
 500
 501   Double_t rt   = (time - .5*fTRFlo) / fTRFwid;
 502   Int_t    iBin = (Int_t) rt;
 503   Double_t dt   = rt - iBin;
 504   if ((iBin >= 0) && (iBin+1 < fTRFbin)) {
 505     return fTRFsmp[iBin] + (fTRFsmp[iBin+1] - fTRFsmp[iBin])*dt;
 506   }
 507   else {
 508     return 0.0;
 509   }
 510
 511 }
 512
 513 //_____________________________________________________________________________
 514 Double_t AliTRDSimParam::CrossTalk(Double_t time) const
 515 {
 516   //
 517   // Applies the pad-pad capacitive cross talk
 518   //
 519
 520   Double_t rt   = (time - fTRFlo) / fTRFwid;
 521   Int_t    iBin = (Int_t) rt;
 522   Double_t dt   = rt - iBin;
 523   if ((iBin >= 0) && (iBin+1 < fTRFbin)) {
 524     return fCTsmp[iBin] + (fCTsmp[iBin+1] - fCTsmp[iBin])*dt;
 525   }
 526   else {
 527     return 0.0;
 528   }
 529
 530 }