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[u/mrichter/AliRoot.git] / ITS / AliITSsimulationSSD.cxx
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57817f7c 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 **************************************************************************/
88cb7938 15
57817f7c 16/* $Id$ */
17
b0f5e3fc 18#include <stdio.h>
8a00af9a 19#include <stdlib.h>
4ae5bbc4 20#include <Riostream.h>
b0f5e3fc 21#include <TObjArray.h>
e939a978 22#include <TRandom.h>
23
fd61217e 24#include "AliITSmodule.h"
57817f7c 25#include "AliITSMapA2.h"
c7a4dac0 26#include "AliITSpList.h"
fcf95fc7 27#include "AliITSCalibrationSSD.h"
c7a4dac0 28#include "AliITSsegmentationSSD.h"
14a74335 29//#include "AliITSdcsSSD.h"
b0f5e3fc 30#include "AliITS.h"
3a97c582 31#include "AliITShit.h"
e869281d 32#include "AliITSdigitSSD.h"
b0f5e3fc 33#include "AliRun.h"
569a17d8 34#include "AliITSgeom.h"
57817f7c 35#include "AliITSsimulationSSD.h"
84541af4 36#include "AliITSTableSSD.h"
b0f5e3fc 37
925e6570 38ClassImp(AliITSsimulationSSD)
fd61217e 39////////////////////////////////////////////////////////////////////////
8ba39da9 40// //
14a74335 41// Author: Enrico Fragiacomo //
42// enrico.fragiacomo@ts.infn.it //
82adfb7d 43// Last revised: june 2008 //
14a74335 44// //
45// AliITSsimulationSSD is the simulation of SSD. //
8ba39da9 46////////////////////////////////////////////////////////////////////////
fd61217e 47
0315d466 48//----------------------------------------------------------------------
aacedc3e 49AliITSsimulationSSD::AliITSsimulationSSD():AliITSsimulation(),
14a74335 50 //fDCS(0),
aacedc3e 51fMapA2(0),
52fIonE(0.0),
53fDifConst(),
54fDriftVel(){
55 //default Constructor
56 //Inputs:
57 // none.
58 // Outputs:
59 // none.
60 // Return:
61 // A default construction AliITSsimulationSSD class
57817f7c 62}
63//----------------------------------------------------------------------
8ba39da9 64AliITSsimulationSSD::AliITSsimulationSSD(AliITSDetTypeSim* dettyp):
65AliITSsimulation(dettyp),
14a74335 66//fDCS(0),
aacedc3e 67fMapA2(0),
68fIonE(0.0),
69fDifConst(),
70fDriftVel(){
3a97c582 71 // Constructor
72 // Input:
14a74335 73 // AliITSDetTypeSim Pointer to the SSD dettype to be used
3a97c582 74 // Outputs:
75 // none.
76 // Return
aacedc3e 77 // A standard constructed AliITSsimulationSSD class
3a97c582 78
aacedc3e 79 Init();
c7a4dac0 80}
81//----------------------------------------------------------------------
aacedc3e 82void AliITSsimulationSSD::Init(){
14a74335 83 // Inilizer, Inilizes all of the variable as needed in a standard place.
84 // Input:
85 // AliITSsegmentationSSD *seg Pointer to the SSD segmentation to be used
86 // AliITSCalibrationSSD *resp Pointer to the SSD responce class to be used
87 // Outputs:
88 // none.
89 // Return
90 // none.
8ba39da9 91 AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2);
14a74335 92
93 SetDriftVelocity(); // use default values in .h file
94 SetIonizeE(); // use default values in .h file
95 SetDiffConst(); // use default values in .h file
96 fpList = new AliITSpList(2,GetNStrips());
97 fMapA2 = new AliITSMapA2(seg);
b0f5e3fc 98}
0315d466 99//______________________________________________________________________
57817f7c 100AliITSsimulationSSD& AliITSsimulationSSD::operator=(
3a97c582 101 const AliITSsimulationSSD &s){
84541af4 102 // Operator =
103
104 if(this==&s) return *this;
105
14a74335 106 // this->fDCS = new AliITSdcsSSD(*(s.fDCS));
84541af4 107 this->fMapA2 = s.fMapA2;
108 this->fIonE = s.fIonE;
109 this->fDifConst[0] = s.fDifConst[0];
110 this->fDifConst[1] = s.fDifConst[1];
111 this->fDriftVel[0] = s.fDriftVel[0];
112 this->fDriftVel[1] = s.fDriftVel[1];
113 return *this;
b0f5e3fc 114}
85f5e9c2 115/*
57817f7c 116//______________________________________________________________________
5402d9ca 117AliITSsimulation& AliITSsimulationSSD::operator=(
d2f55a22 118 const AliITSsimulation &s){
119 // Operator =
120
121 if(this==&s) return *this;
122 Error("AliITSsimulationSSD","Not allowed to make a = with "
123 "AliITSsimulationSSD Using default creater instead");
124
125 return *this;
126}
85f5e9c2 127*/
d2f55a22 128//______________________________________________________________________
ac74f489 129AliITSsimulationSSD::AliITSsimulationSSD(const AliITSsimulationSSD &source):
7537d03c 130 AliITSsimulation(source),
131fMapA2(source.fMapA2),
132fIonE(source.fIonE),
133fDifConst(),
134fDriftVel(){
84541af4 135 // copy constructor
7537d03c 136 fDifConst[0] = source.fDifConst[0];
137 fDifConst[1] = source.fDifConst[1];
138 fDriftVel[0] = source.fDriftVel[0];
139 fDriftVel[1] = source.fDriftVel[1];
b0f5e3fc 140}
0315d466 141//______________________________________________________________________
b0f5e3fc 142AliITSsimulationSSD::~AliITSsimulationSSD() {
84541af4 143 // destructor
144 delete fMapA2;
14a74335 145 //delete fDCS;
0315d466 146}
57817f7c 147//______________________________________________________________________
3a97c582 148void AliITSsimulationSSD::InitSimulationModule(Int_t module,Int_t event){
149 // Creates maps to build the list of tracks for each sumable digit
150 // Inputs:
151 // Int_t module // Module number to be simulated
152 // Int_t event // Event number to be simulated
153 // Outputs:
154 // none.
155 // Return
156 // none.
157
aacedc3e 158 SetModuleNumber(module);
159 SetEventNumber(event);
3a97c582 160 fMapA2->ClearMap();
161 fpList->ClearMap();
162}
163//______________________________________________________________________
164void AliITSsimulationSSD::FinishSDigitiseModule(){
165 // Does the Sdigits to Digits work
166 // Inputs:
167 // none.
168 // Outputs:
169 // none.
170 // Return:
171 // none.
172
14a74335 173 FillMapFrompList(fpList); // need to check if needed here or not????
174 SDigitToDigit(fModule,fpList);
175 fpList->ClearMap();
176 fMapA2->ClearMap();
3a97c582 177}
178//______________________________________________________________________
aacedc3e 179void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t,Int_t) {
84541af4 180 // Digitizes hits for one SSD module
aacedc3e 181 SetModuleNumber(mod->GetIndex());
14a74335 182
3a97c582 183 HitsToAnalogDigits(mod,fpList);
aacedc3e 184 SDigitToDigit(GetModuleNumber(),fpList);
14a74335 185
3a97c582 186 fpList->ClearMap();
84541af4 187 fMapA2->ClearMap();
c7a4dac0 188}
189//______________________________________________________________________
aacedc3e 190void AliITSsimulationSSD::SDigitiseModule(AliITSmodule *mod,Int_t,Int_t) {
3a97c582 191 // Produces Summable/Analog digits and writes them to the SDigit tree.
c7a4dac0 192
ac74f489 193 HitsToAnalogDigits(mod,fpList);
c7a4dac0 194
ac74f489 195 WriteSDigits(fpList);
14a74335 196
ac74f489 197 fpList->ClearMap();
198 fMapA2->ClearMap();
c7a4dac0 199}
200//______________________________________________________________________
201void AliITSsimulationSSD::SDigitToDigit(Int_t module,AliITSpList *pList){
84541af4 202 // Takes the pList and finishes the digitization.
14a74335 203
84541af4 204 ApplyNoise(pList,module);
205 ApplyCoupling(pList,module);
14a74335 206 ApplyDeadChannels(module);
207
8ba39da9 208 ChargeToSignal(module,pList);
c7a4dac0 209}
210//______________________________________________________________________
211void AliITSsimulationSSD::HitsToAnalogDigits(AliITSmodule *mod,
84541af4 212 AliITSpList *pList){
3a97c582 213 // Loops over all hits to produce Analog/floating point digits. This
214 // is also the first task in producing standard digits.
14a74335 215 Int_t lasttrack = -2;
216 Int_t idtrack = -2;
217 Double_t x0=0.0, y0=0.0, z0=0.0;
218 Double_t x1=0.0, y1=0.0, z1=0.0;
219 Double_t de=0.0;
220 Int_t module = mod->GetIndex();
221
222 AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2);
223
82adfb7d 224 TObjArray *hits = mod->GetHits();
225 Int_t nhits = hits->GetEntriesFast();
226 if (nhits<=0) return;
227 AliITSTableSSD * tav = new AliITSTableSSD(GetNStrips());
228 module = mod->GetIndex();
229 if ( mod->GetLayer() == 6 ) seg->SetLayer(6);
230 if ( mod->GetLayer() == 5 ) seg->SetLayer(5);
231 for(Int_t i=0; i<nhits; i++) {
232 // LineSegmentL returns 0 if the hit is entering
233 // If hits is exiting returns positions of entering and exiting hits
234 // Returns also energy loss
235 if(GetDebug(4)){
236 cout << i << " ";
237 cout << mod->GetHit(i)->GetXL() << " "<<mod->GetHit(i)->GetYL();
238 cout << " " << mod->GetHit(i)->GetZL();
239 cout << endl;
240 } // end if
241 if (mod->LineSegmentL(i, x0, x1, y0, y1, z0, z1, de, idtrack)) {
242 HitToDigit(module, x0, y0, z0, x1, y1, z1, de,tav);
243 if (lasttrack != idtrack || i==(nhits-1)) {
244 GetList(idtrack,i,module,pList,tav);
14a74335 245 } // end if
82adfb7d 246 lasttrack=idtrack;
247 } // end if
248 } // end loop over hits
249 delete tav; tav=0;
250 return;
b0f5e3fc 251}
0315d466 252//----------------------------------------------------------------------
fd61217e 253void AliITSsimulationSSD::HitToDigit(Int_t module, Double_t x0, Double_t y0,
84541af4 254 Double_t z0, Double_t x1, Double_t y1,
255 Double_t z1, Double_t de,
256 AliITSTableSSD *tav) {
14a74335 257
8ba39da9 258 // hit to digit conversion
14a74335 259
8ba39da9 260 AliITSsegmentationSSD* seg = (AliITSsegmentationSSD*)GetSegmentationModel(2);
14a74335 261 // Turns hits in SSD module into one or more digits.
82adfb7d 262 //Float_t tang[2] = {0.0,0.0};
263 //seg->Angles(tang[0], tang[1]);//stereo<<->tan(stereo)~=stereo
14a74335 264 Double_t x, y, z;
265 Double_t dex=0.0, dey=0.0, dez=0.0;
266 Double_t pairs; // pair generation energy per step.
267 Double_t sigma[2] = {0.,0.};// standard deviation of the diffusion gaussian
268 Double_t tdrift[2] = {0.,0.}; // time of drift
269 Double_t w;
270 Double_t inf[2], sup[2], par0[2];
271
272 // Steps in the module are determined "manually" (i.e. No Geant)
273 // NumOfSteps divide path between entering and exiting hits in steps
274 Int_t numOfSteps = NumOfSteps(x1, y1, z1, dex, dey, dez);
275 // Enery loss is equally distributed among steps
276 de = de/numOfSteps;
277 pairs = de/GetIonizeE(); // e-h pairs generated
82adfb7d 278
279 //-----------------------------------------------------
280 // stepping
281 //-----------------------------------------------------
14a74335 282 for(Int_t j=0; j<numOfSteps; j++) { // stepping
82adfb7d 283
14a74335 284 x = x0 + (j+0.5)*dex;
285 y = y0 + (j+0.5)*dey;
286 if ( y > (seg->Dy()/2+10)*1.0E-4 ) {
287 // check if particle is within the detector
288 Warning("HitToDigit",
d35ad08f 289 "hit out of detector y0=%e,y=%e,dey=%e,j =%d module=%d, exceed=%e",
290 y0,y,dey,j,module, y-(seg->Dy()/2+10)*1.0E-4);
14a74335 291 return;
292 } // end if
293 z = z0 + (j+0.5)*dez;
82adfb7d 294
14a74335 295 if(GetDebug(4)) cout <<"HitToDigit "<<x<<" "<<y<<" "<<z<< " "
296 <<dex<<" "<<dey<<" "<<dez<<endl;
82adfb7d 297
298 if(seg->GetLayer()==6) {
299 y=-y; // Lay6 module has sensor up-side-down!!!
300 }
301
302 // w is the coord. perpendicular to the strips
303 // Float_t xp=x*1.e+4,zp=z*1.e+4; // microns
304 Float_t xp=x,zp=z;
305 seg->GetPadTxz(xp,zp);
306
307 Int_t k;
308 //---------------------------------------------------------
309 // Pside
310 //------------------------------------------------------------
311 k=0;
312
14a74335 313 // calculate drift time
314 // y is the minimum path
315 tdrift[0] = (y+(seg->Dy()*1.0E-4)/2)/GetDriftVelocity(0);
82adfb7d 316
317 w = xp; // P side strip number
318
319 if((w<(-0.5)) || (w>(GetNStrips()-0.5))) {
320 // this check rejects hits in regions not covered by strips
321 // 0.5 takes into account boundaries
322 if(GetDebug(4)) cout << "Dead SSD region, x,z="<<x<<","<<z<<endl;
323 return; // There are dead region on the SSD sensitive volume!!!
324 } // end if
325
326 // sigma is the standard deviation of the diffusion gaussian
327 if(tdrift[k]<0) return;
328
329 sigma[k] = TMath::Sqrt(2*GetDiffConst(k)*tdrift[k]);
330 sigma[k] /= (GetStripPitch()*1.0E-4); //units of Pitch
331
332 if(sigma[k]==0.0) {
333 Error("HitToDigit"," sigma[%d]=0",k);
334 exit(0);
335 } // end if
336
337 par0[k] = pairs;
338 // we integrate the diffusion gaussian from -3sigma to 3sigma
339 inf[k] = w - 3*sigma[k]; // 3 sigma from the gaussian average
340 sup[k] = w + 3*sigma[k]; // 3 sigma from the gaussian average
341 // IntegrateGaussian does the actual
342 // integration of diffusion gaussian
343 IntegrateGaussian(k, par0[k], w, sigma[k], inf[k], sup[k],tav);
344
345 //------------------------------------------------------
346 // end Pside
347 //-------------------------------------------------------
348
349 //------------------------------------------------------
350 // Nside
351 //-------------------------------------------------------
352 k=1;
14a74335 353 tdrift[1] = ((seg->Dy()*1.0E-4)/2-y)/GetDriftVelocity(1);
354
82adfb7d 355 //tang[k]=TMath::Tan(tang[k]);
356
357 w = zp; // N side strip number
358
359 if((w<(-0.5)) || (w>(GetNStrips()-0.5))) {
360 // this check rejects hits in regions not covered by strips
361 // 0.5 takes into account boundaries
362 if(GetDebug(4)) cout << "Dead SSD region, x,z="<<x<<","<<z<<endl;
363 return; // There are dead region on the SSD sensitive volume.
364 } // end if
365
14a74335 366 // sigma is the standard deviation of the diffusion gaussian
82adfb7d 367 if(tdrift[k]<0) return;
368
369 sigma[k] = TMath::Sqrt(2*GetDiffConst(k)*tdrift[k]);
370 sigma[k] /= (GetStripPitch()*1.0E-4); //units of Pitch
371
372 if(sigma[k]==0.0) {
373 Error("HitToDigit"," sigma[%d]=0",k);
374 exit(0);
375 } // end if
376
377 par0[k] = pairs;
378 // we integrate the diffusion gaussian from -3sigma to 3sigma
379 inf[k] = w - 3*sigma[k]; // 3 sigma from the gaussian average
380 sup[k] = w + 3*sigma[k]; // 3 sigma from the gaussian average
381 // IntegrateGaussian does the actual
382 // integration of diffusion gaussian
383 IntegrateGaussian(k, par0[k], w, sigma[k], inf[k], sup[k],tav);
384
385 //-------------------------------------------------
386 // end Nside
387 //-------------------------------------------------
388
389
14a74335 390 } // end stepping
b0f5e3fc 391}
14a74335 392
57817f7c 393//______________________________________________________________________
c7a4dac0 394void AliITSsimulationSSD::ApplyNoise(AliITSpList *pList,Int_t module){
14a74335 395 // Apply Noise.
396 Int_t ix;
397 Double_t signal,noise;
398 AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module);
8be4e1b1 399
14a74335 400 // Pside
401 for(ix=0;ix<GetNStrips();ix++){ // loop over strips
402
403 // noise is gaussian
ced4d9bc 404 noise = (Double_t) gRandom->Gaus(0,res->GetNoiseP(ix));
14a74335 405
406 // need to calibrate noise
407 // NOTE. noise from the calibration database comes uncalibrated,
408 // it needs to be calibrated in order to be added
409 // to the signal. It will be decalibrated later on together with the noise
569a17d8 410 noise *= (Double_t) res->GetGainP(ix);
14a74335 411
412 // noise comes in ADC channels from the calibration database
413 // It needs to be converted back to electronVolts
8be4e1b1 414 noise /= res->GetSSDDEvToADC(1.);
14a74335 415
416 // Finally, noise is added to the signal
417 signal = noise + fMapA2->GetSignal(0,ix);//get signal from map
418 fMapA2->SetHit(0,ix,signal); // give back signal to map
419 if(signal>0.0) pList->AddNoise(0,ix,module,noise);
420 } // loop over strip
421
422 // Nside
423 for(ix=0;ix<GetNStrips();ix++){ // loop over strips
ced4d9bc 424 noise = (Double_t) gRandom->Gaus(0,res->GetNoiseN(ix));// give noise to signal
569a17d8 425 noise *= (Double_t) res->GetGainN(ix);
8be4e1b1 426 noise /= res->GetSSDDEvToADC(1.);
14a74335 427 signal = noise + fMapA2->GetSignal(1,ix);//get signal from map
428 fMapA2->SetHit(1,ix,signal); // give back signal to map
429 if(signal>0.0) pList->AddNoise(1,ix,module,noise);
430 } // loop over strip
431
b0f5e3fc 432}
0315d466 433//______________________________________________________________________
c7a4dac0 434void AliITSsimulationSSD::ApplyCoupling(AliITSpList *pList,Int_t module) {
14a74335 435 // Apply the effect of electronic coupling between channels
436 Int_t ix;
437 Double_t signal=0;
8be4e1b1 438 //AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module);
439 AliITSSimuParam* res = fDetType->GetSimuParam();
440
14a74335 441 Double_t *contrLeft = new Double_t[GetNStrips()];
442 Double_t *contrRight = new Double_t[GetNStrips()];
443
444 // P side coupling
445 for(ix=0;ix<GetNStrips();ix++){
8be4e1b1 446 if(ix>0) contrLeft[ix] = fMapA2->GetSignal(0,ix-1)*res->GetSSDCouplingPL();
14a74335 447 else contrLeft[ix] = 0.0;
8be4e1b1 448 if(ix<(GetNStrips()-1)) contrRight[ix] = fMapA2->GetSignal(0,ix+1)*res->GetSSDCouplingPR();
14a74335 449 else contrRight[ix] = 0.0;
450 } // loop over strips
451
452 for(ix=0;ix<GetNStrips();ix++){
8be4e1b1 453 signal = contrLeft[ix] + contrRight[ix] - res->GetSSDCouplingPL() * fMapA2->GetSignal(0,ix)
454 - res->GetSSDCouplingPR() * fMapA2->GetSignal(0,ix);
14a74335 455 fMapA2->AddSignal(0,ix,signal);
456 if(signal>0.0) pList->AddNoise(0,ix,module,signal);
457 } // loop over strips
458
459 // N side coupling
460 for(ix=0;ix<GetNStrips();ix++){
8be4e1b1 461 if(ix>0) contrLeft[ix] = fMapA2->GetSignal(1,ix-1)*res->GetSSDCouplingNL();
14a74335 462 else contrLeft[ix] = 0.0;
8be4e1b1 463 if(ix<(GetNStrips()-1)) contrRight[ix] = fMapA2->GetSignal(1,ix+1)*res->GetSSDCouplingNR();
14a74335 464 else contrRight[ix] = 0.0;
465 } // loop over strips
466
467 for(ix=0;ix<GetNStrips();ix++){
8be4e1b1 468 signal = contrLeft[ix] + contrRight[ix] - res->GetSSDCouplingNL() * fMapA2->GetSignal(0,ix)
469 - res->GetSSDCouplingNR() * fMapA2->GetSignal(0,ix);
14a74335 470 fMapA2->AddSignal(1,ix,signal);
471 if(signal>0.0) pList->AddNoise(1,ix,module,signal);
472 } // loop over strips
473
474
475 delete [] contrLeft;
476 delete [] contrRight;
b0f5e3fc 477}
14a74335 478
479//______________________________________________________________________
480void AliITSsimulationSSD::ApplyDeadChannels(Int_t module) {
481 // Kill dead channels setting gain to zero
482
14a74335 483 AliITSCalibrationSSD* res = (AliITSCalibrationSSD*)GetCalibrationModel(module);
484
a64f9843 485 for(Int_t i=0;i<GetNStrips();i++){
14a74335 486
ced4d9bc 487 if(res->IsPChannelBad(i)) res->SetGainP(i,0.0);
488 if(res->IsNChannelBad(i)) res->SetGainN(i,0.0);
a64f9843 489
490 } // loop over strips
14a74335 491
492}
493
0315d466 494//______________________________________________________________________
fd61217e 495Float_t AliITSsimulationSSD::F(Float_t av, Float_t x, Float_t s) {
aacedc3e 496 // Computes the integral of a gaussian using Error Function
497 Float_t sqrt2 = TMath::Sqrt(2.0);
498 Float_t sigm2 = sqrt2*s;
499 Float_t integral;
fd61217e 500
aacedc3e 501 integral = 0.5 * TMath::Erf( (x - av) / sigm2);
502 return integral;
0315d466 503}
504//______________________________________________________________________
fd61217e 505void AliITSsimulationSSD::IntegrateGaussian(Int_t k,Double_t par, Double_t w,
84541af4 506 Double_t sigma,
507 Double_t inf, Double_t sup,
508 AliITSTableSSD *tav) {
aacedc3e 509 // integrate the diffusion gaussian
510 // remind: inf and sup are w-3sigma and w+3sigma
511 // we could define them here instead of passing them
512 // this way we are free to introduce asimmetry
513
514 Double_t a=0.0, b=0.0;
515 Double_t dXCharge1 = 0.0, dXCharge2 = 0.0;
516 // dXCharge1 and 2 are the charge to two neighbouring strips
517 // Watch that we only involve at least two strips
518 // Numbers greater than 2 of strips in a cluster depend on
519 // geometry of the track and delta rays, not charge diffusion!
520
521 Double_t strip = TMath::Floor(w); // closest strip on the left
522
523 if ( TMath::Abs((strip - w)) < 0.5) {
524 // gaussian mean is closer to strip on the left
525 a = inf; // integration starting point
526 if((strip+0.5)<=sup) {
527 // this means that the tail of the gaussian goes beyond
528 // the middle point between strips ---> part of the signal
529 // is given to the strip on the right
530 b = strip + 0.5; // integration stopping point
531 dXCharge1 = F( w, b, sigma) - F(w, a, sigma);
532 dXCharge2 = F( w, sup, sigma) - F(w ,b, sigma);
533 }else {
534 // this means that all the charge is given to the strip on the left
535 b = sup;
536 dXCharge1 = 0.9973; // gaussian integral at 3 sigmas
537 dXCharge2 = 0.0;
538 } // end if
539 dXCharge1 = par * dXCharge1;// normalize by mean of number of carriers
540 dXCharge2 = par * dXCharge2;
541
542 // for the time being, signal is the charge
543 // in ChargeToSignal signal is converted in ADC channel
544 fMapA2->AddSignal(k,(Int_t)strip,dXCharge1);
545 tav->Add(k,(Int_t)strip);
546 if(((Int_t) strip) < (GetNStrips()-1)) {
547 // strip doesn't have to be the last (remind: last=GetNStrips()-1)
548 // otherwise part of the charge is lost
549 fMapA2->AddSignal(k,((Int_t)strip+1),dXCharge2);
550 tav->Add(k,((Int_t)(strip+1)));
551 } // end if
552 }else{
553 // gaussian mean is closer to strip on the right
554 strip++; // move to strip on the rigth
555 b = sup; // now you know where to stop integrating
556 if((strip-0.5)>=inf) {
557 // tail of diffusion gaussian on the left goes left of
558 // middle point between strips
559 a = strip - 0.5; // integration starting point
560 dXCharge1 = F(w, b, sigma) - F(w, a, sigma);
561 dXCharge2 = F(w, a, sigma) - F(w, inf, sigma);
562 }else {
563 a = inf;
564 dXCharge1 = 0.9973; // gaussian integral at 3 sigmas
565 dXCharge2 = 0.0;
566 } // end if
567 dXCharge1 = par * dXCharge1; // normalize by means of carriers
568 dXCharge2 = par * dXCharge2;
569 // for the time being, signal is the charge
570 // in ChargeToSignal signal is converted in ADC channel
571 fMapA2->AddSignal(k,(Int_t)strip,dXCharge1);
572 tav->Add(k,(Int_t)strip);
573 if(((Int_t) strip) > 0) {
574 // strip doesn't have to be the first
575 // otherwise part of the charge is lost
576 fMapA2->AddSignal(k,((Int_t)strip-1),dXCharge2);
577 tav->Add(k,((Int_t)(strip-1)));
578 } // end if
579 } // end if
b0f5e3fc 580}
0315d466 581//______________________________________________________________________
fd61217e 582Int_t AliITSsimulationSSD::NumOfSteps(Double_t x, Double_t y, Double_t z,
aacedc3e 583 Double_t &dex,Double_t &dey,
584 Double_t &dez){
585 // number of steps
586 // it also returns steps for each coord
587 //AliITSsegmentationSSD *seg = new AliITSsegmentationSSD();
588
589 Double_t step = 25E-4;
590 //step = (Double_t) seg->GetStepSize(); // step size (cm)
591 Int_t numOfSteps = (Int_t) (TMath::Sqrt(x*x+y*y+z*z)/step);
592
593 if (numOfSteps < 1) numOfSteps = 1; // one step, at least
14a74335 594 //numOfSteps=1;
aacedc3e 595
596 // we could condition the stepping depending on the incident angle
597 // of the track
598 dex = x/numOfSteps;
599 dey = y/numOfSteps;
600 dez = z/numOfSteps;
601
602 return numOfSteps;
fd61217e 603}
0315d466 604//----------------------------------------------------------------------
c7a4dac0 605void AliITSsimulationSSD::GetList(Int_t label,Int_t hit,Int_t mod,
84541af4 606 AliITSpList *pList,AliITSTableSSD *tav) {
aacedc3e 607 // loop over nonzero digits
608 Int_t ix,i;
609 Double_t signal=0.;
610
611 for(Int_t k=0; k<2; k++) {
84541af4 612 ix=tav->Use(k);
aacedc3e 613 while(ix>-1){
614 signal = fMapA2->GetSignal(k,ix);
615 if(signal==0.0) {
616 ix=tav->Use(k);
617 continue;
618 } // end if signal==0.0
619 // check the signal magnitude
620 for(i=0;i<pList->GetNSignals(k,ix);i++){
621 signal -= pList->GetTSignal(k,ix,i);
622 } // end for i
623 // compare the new signal with already existing list
624 if(signal>0)pList->AddSignal(k,ix,label,hit,mod,signal);
625 ix=tav->Use(k);
626 } // end of loop on strips
627 } // end of loop on P/N side
628 tav->Clear();
fd61217e 629}
0315d466 630//----------------------------------------------------------------------
8ba39da9 631void AliITSsimulationSSD::ChargeToSignal(Int_t module,AliITSpList *pList) {
aacedc3e 632 // charge to signal
633 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
634 Float_t threshold = 0.;
635 Int_t size = AliITSdigitSSD::GetNTracks();
636 Int_t * digits = new Int_t[size];
637 Int_t * tracks = new Int_t[size];
638 Int_t * hits = new Int_t[size];
639 Int_t j1;
640 Float_t charges[3] = {0.0,0.0,0.0};
641 Float_t signal;
fcf95fc7 642 AliITSCalibrationSSD* res =(AliITSCalibrationSSD*)GetCalibrationModel(module);
8be4e1b1 643 AliITSSimuParam* simpar = fDetType->GetSimuParam();
aacedc3e 644
645 for(Int_t k=0;k<2;k++){ // both sides (0=Pside, 1=Nside)
14a74335 646 for(Int_t ix=0;ix<GetNStrips();ix++){ // loop over strips
647
648 // if strip is dead -> gain=0
649 if( ((k==0)&&(res->GetGainP(ix)==0)) || ((k==1)&&(res->GetGainN(ix)==0))) continue;
650
3a4139a2 651 signal = fMapA2->GetSignal(k,ix);
14a74335 652 // signal has to be uncalibrated
653 // In real life, gains are supposed to be calculated from calibration runs,
654 // stored in the calibration DB and used in the reconstruction
655 // (see AliITSClusterFinderSSD.cxx)
656 if(k==0) signal /= res->GetGainP(ix);
657 else signal /= res->GetGainN(ix);
658
659 // signal is converted in unit of ADC
8be4e1b1 660 signal = res->GetSSDDEvToADC(signal);
14a74335 661 if(signal>4096.) signal = 4096.;//if exceeding, accumulate last one
662
663 // threshold for zero suppression is set on the basis of the noise
664 // A good value is 3*sigma_noise
ced4d9bc 665 if(k==0) threshold = res->GetNoiseP(ix);
666 else threshold = res->GetNoiseN(ix);
667
8be4e1b1 668 threshold *= simpar->GetSSDZSThreshold(); // threshold at 3 sigma noise
ced4d9bc 669
14a74335 670 if(signal < threshold) continue;
ced4d9bc 671 //cout<<signal<<" "<<threshold<<endl;
14a74335 672
673 digits[0] = k;
674 digits[1] = ix;
675 digits[2] = TMath::Nint(signal);
676 for(j1=0;j1<size;j1++)if(j1<pList->GetNEntries()){
677 // only three in digit.
678 tracks[j1] = pList->GetTrack(k,ix,j1);
679 hits[j1] = pList->GetHit(k,ix,j1);
680 }else{
681 tracks[j1] = -3;
682 hits[j1] = -1;
683 } // end for j1
684 // finally add digit
685 aliITS->AddSimDigit(2,0,digits,tracks,hits,charges);
686 } // end for ix
aacedc3e 687 } // end for k
688 delete [] digits;
689 delete [] tracks;
690 delete [] hits;
c7a4dac0 691}
692//______________________________________________________________________
693void AliITSsimulationSSD::WriteSDigits(AliITSpList *pList){
aacedc3e 694 // Fills the Summable digits Tree
695 Int_t i,ni,j,nj;
696 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
697
698 pList->GetMaxMapIndex(ni,nj);
699 for(i=0;i<ni;i++)for(j=0;j<nj;j++){
700 if(pList->GetSignalOnly(i,j)>0.0){
701 aliITS->AddSumDigit(*(pList->GetpListItem(i,j)));
702 if(GetDebug(4)) cout << "pListSSD: "<<*(pList->GetpListItem(i,j))
703 << endl;
704 } // end if
705 } // end for i,j
84541af4 706 return;
c7a4dac0 707}
708//______________________________________________________________________
709void AliITSsimulationSSD::FillMapFrompList(AliITSpList *pList){
aacedc3e 710 // Fills fMap2A from the pList of Summable digits
711 Int_t k,ix;
c7a4dac0 712
aacedc3e 713 for(k=0;k<2;k++)for(ix=0;ix<GetNStrips();ix++)
714 fMapA2->AddSignal(k,ix,pList->GetSignal(k,ix));
715 return;
b0f5e3fc 716}
57817f7c 717//______________________________________________________________________
718void AliITSsimulationSSD::Print(ostream *os){
aacedc3e 719 //Standard output format for this class
720
721 //AliITSsimulation::Print(os);
722 *os << fIonE <<",";
723 *os << fDifConst[0] <<","<< fDifConst[1] <<",";
724 *os << fDriftVel[0] <<","<< fDriftVel[1];
725 //*os <<","; fDCS->Print(os);
726 //*os <<","; fMapA2->Print(os);
57817f7c 727}
728//______________________________________________________________________
729void AliITSsimulationSSD::Read(istream *is){
aacedc3e 730 // Standard output streaming function.
731
732 //AliITSsimulation::Read(is);
733 *is >> fIonE;
734 *is >> fDifConst[0] >> fDifConst[1];
735 *is >> fDriftVel[0] >> fDriftVel[1];
736 //fDCS->Read(is);
737 //fMapA2->Read(is);
57817f7c 738}
739//______________________________________________________________________
740ostream &operator<<(ostream &os,AliITSsimulationSSD &source){
aacedc3e 741 // Standard output streaming function.
57817f7c 742
aacedc3e 743 source.Print(&os);
744 return os;
57817f7c 745}
746//______________________________________________________________________
747istream &operator>>(istream &os,AliITSsimulationSSD &source){
aacedc3e 748 // Standard output streaming function.
57817f7c 749
aacedc3e 750 source.Read(&os);
751 return os;
57817f7c 752}
c7a4dac0 753//______________________________________________________________________
84541af4 754
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