5 #include "AliITSsegmentationSSD.h"
6 #include "AliITSresponseSSD.h"
7 #include "AliITSsimulationSSD.h"
8 #include "AliITSdictSSD.h"
9 #include "AliITSdcsSSD.h"
11 #include "AliITShit.h"
12 #include "AliITSdigit.h"
13 #include "AliITSmodule.h"
17 ClassImp(AliITSsimulationSSD);
18 //------------------------------------------------------------
19 AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg,
20 AliITSresponse *resp){
26 fDCS = new AliITSdcsSSD(seg,resp);
28 fNstrips = fSegmentation->Npx();
29 fPitch = fSegmentation->Dpx(0);
31 fP = new TArrayF(fNstrips+1);
32 fN = new TArrayF(fNstrips+1);
34 fTracksP = new AliITSdictSSD[fNstrips+1];
35 fTracksN = new AliITSdictSSD[fNstrips+1];
38 fSteps = 10; // still hard-wired - set in SetDetParam and get it via
39 // fDCS together with the others eventually
42 //___________________________________________________________________________
43 AliITSsimulationSSD& AliITSsimulationSSD::operator=(AliITSsimulationSSD
46 if(this==&source) return *this;
48 this->fDCS = new AliITSdcsSSD(*(source.fDCS));
49 this->fN = new TArrayF(*(source.fN));
50 this->fP = new TArrayF(*(source.fP));
51 this->fTracksP = new AliITSdictSSD(*(source.fTracksP));
52 this->fTracksN = new AliITSdictSSD(*(source.fTracksN));
53 this->fNstrips = source.fNstrips;
54 this->fPitch = source.fPitch;
55 this->fSteps = source.fSteps;
58 //_____________________________________________________________
59 AliITSsimulationSSD::AliITSsimulationSSD(AliITSsimulationSSD &source){
63 //____________________________________________________________________________
64 AliITSsimulationSSD::~AliITSsimulationSSD() {
71 if(fTracksP) delete [] fTracksP;
72 if(fTracksN) delete [] fTracksN;
77 //_______________________________________________________________
80 //_______________________________________________________________
82 void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t module,
84 // Digitizes one SSD module of hits.
86 TObjArray *hits = mod->GetHits();
87 Int_t nhits = hits->GetEntriesFast();
90 //printf("simSSD: module nhits %d %d\n",module,nhits);
93 for(i=0; i<fNstrips; i++) {
96 fTracksP[i].ZeroTracks();
97 fTracksN[i].ZeroTracks();
100 for(i=0; i<nhits; i++) {
101 Int_t idtrack=mod->GetHitTrackIndex(i);
102 HitToDigit(i,idtrack,nhits,hits);
115 //---------------------------------------------------------------
117 void AliITSsimulationSSD::HitToDigit(Int_t & hitNo,Int_t idtrack,
118 Int_t nhits,TObjArray *hits) {
119 // Turns one or more hits in an SSD module into one or more digits.
121 Int_t stripP, stripN, i;
125 Float_t arrayEP[10]; // hard-wired number of steps
129 Float_t ionization = 0;
135 // check if this is the right order !!!!!
137 AliITShit *hitI = (AliITShit*)hits->At(hitNo++);
138 AliITShit *hitE = (AliITShit*)hits->At(hitNo);
141 while (!((hitE->StatusExiting()) ||
142 (hitE->StatusDisappeared()) ||
143 (hitE->StatusStop()))) {
146 ionization = hitE->GetIonization();
147 hitE = (AliITShit*)hits->At(hitNo);
152 if (hitI->GetTrack() == hitE->GetTrack())
154 track = hitI->GetTrack();
156 printf("!!! Emergency !!!\n");
159 ionization += hitE->GetIonization();
161 const Float_t kconvm=10000.; // cm -> microns
164 hitI->GetPositionL(xI, yI, zI);
171 hitE->GetPositionL(xE, yE, zE);
177 Float_t dx = (xE - xI);
178 Float_t dz = (zE - zI);
183 fSegmentation->GetPadIxz(xI,zI,stripP,stripN);
185 printf("%5d %8.3f %8.3f %8.3f %8.3f %d %d %d\n",
186 hitNo, xI, zI, dx, dz,
187 stripP, stripN, track);
188 printf("%10.5f %10d \n", ionization, hitI->fTrack);
197 for (i=0; i<fSteps; i++) {
199 // arrayEP[i] = gRandom->Landau(ionization/fSteps, ionization/(4*fSteps));
200 // arrayEN[i] = gRandom->Landau(ionization/fSteps, ionization/(4*fSteps));
201 arrayEP[i] = ionization/fSteps;
202 arrayEN[i] = ionization/fSteps;
208 const Float_t kconv = 1.0e9 / 3.6; // GeV -> e-hole pairs
210 for(i=0; i<fSteps; i++) {
212 arrayEP[i] = kconv * arrayEP[i] * (ionization / eP);
213 arrayEN[i] = kconv * arrayEN[i] * (ionization / eN);
219 Float_t sigmaP, sigmaN;
220 fResponse->SigmaSpread(sigmaP,sigmaN);
222 //printf("SigmaP SigmaN %f %f\n",sigmaP, sigmaN);
224 Float_t noiseP, noiseN;
225 fResponse->GetNoiseParam(noiseP,noiseN);
227 //printf("NoiseP NoiseN %f %f\n",noiseP, noiseN);
229 for(i=0; i<fSteps; i++) {
233 fSegmentation->GetPadIxz(xI,zI,stripP,stripN);
234 //printf("hitNo %d i xI zI stripP stripN %d %f %f %d %d\n",hitNo,i,xI, zI, stripP, stripN);
235 dsP = Get2Strip(1,stripP,xI, zI); // Between 0-1
236 dsN = Get2Strip(0,stripN,xI, zI); // Between 0-1
238 //sP = sigmaP * sqrt(300. * i / (fSteps));
239 //sN = sigmaN * sqrt(300. * i /(fSteps-i));
241 sP = sigmaP * sqrt(300. * (i+1) / (fSteps));
242 sN = sigmaN * sqrt(300. * (i+1) /(fSteps-i));
245 sP = (i<2 && dsP>0.3 && dsP<0.7)? 20. : sP; // square of (microns)
246 sN = (i>fSteps-2 && dsN>0.3 && dsN<0.7)? 20. : sN; // square of (microns)
248 sP = (i==2 && dsP>0.4 && dsP<0.6)? 15. : sP; // square of (microns)
249 sN = (i==8 && dsN>0.4 && dsN<0.6)? 15. : sN; // square of (microns)
252 //printf("i=%d SigmaP SigmaN sP sN %f %f %e %e\n",i,sigmaP, sigmaN,sP,sN);
254 for (j=-1; j<2; j++) {
255 if (stripP+j<0 || stripP+j>fNstrips) continue;
256 signal = arrayEP[i] * TMath::Abs( (F(j+0.5-dsP,sP)-F(j-0.5-dsP,sP)) );
257 //printf("SimSSD::HitsToDigits:%d arrayEP[%d]=%e signal=%e\n",j,i,arrayEP[i],signal);
258 if (signal > noiseP/fSteps) {
259 (*fP)[stripP+j] += signal;
260 dict = (fTracksP+stripP+j);
261 (*dict).AddTrack(track);
263 } // end for j loop over neighboring strips
265 for (j=-1; j<2; j++) {
266 if (stripN+j<0 || stripN+j>fNstrips) continue;
267 signal = arrayEN[i] * TMath::Abs( (F(j+0.5-dsN,sN)-F(j-0.5-dsN,sN)) );
268 //printf("SimSSD::HitsToDigits:%d arrayEN[%d]=%e signal=%e\n",j,i,arrayEN[i],signal);
269 if (signal > noiseN/fSteps) {
270 (*fN)[stripN+j] += signal;
271 dict = (fTracksN+stripN+j); //co to jest
272 (*dict).AddTrack(track);
274 } // end for j loop over neighboring strips
284 //____________________________________________________________________
286 // Private Methods for Simulation
287 //______________________________________________________________________
290 void AliITSsimulationSSD::ApplyNoise() {
292 Float_t noiseP, noiseN;
293 fResponse->GetNoiseParam(noiseP,noiseN);
296 for(i = 0; i<fNstrips; i++) {
297 (*fP)[i] += gRandom->Gaus(0,noiseP);
298 (*fN)[i] += gRandom->Gaus(0,noiseN);
302 //_________________________________________________________________________
304 void AliITSsimulationSSD::ApplyCoupling() {
305 // Apply the effecto of electronic coupling between channels
307 for(i = 1; i<fNstrips-1; i++) {
308 (*fP)[i] += (*fP)[i-1]*fDCS->GetCouplingPL() + (*fP)[i+1]*fDCS->GetCouplingPR();
309 (*fN)[i] += (*fN)[i-1]*fDCS->GetCouplingNL() + (*fN)[i+1]*fDCS->GetCouplingNR();
313 //__________________________________________________________________________
315 void AliITSsimulationSSD::ApplyThreshold() {
316 // Applies the effect of a threshold on the signals for digitization.
317 Float_t noiseP, noiseN;
318 fResponse->GetNoiseParam(noiseP,noiseN);
320 // or introduce the SetThresholds in fResponse
323 for(i=0; i<fNstrips; i++) {
324 (*fP)[i] = ((*fP)[i] > noiseP*4) ? (*fP)[i] : 0;
325 (*fN)[i] = ((*fN)[i] > noiseN*4) ? (*fN)[i] : 0;
330 //__________________________________________________________________________
332 void AliITSsimulationSSD::ApplyDAQ() {
333 // Converts simulated signals to simulated ADC counts
334 AliITS *its=(AliITS*)gAlice->GetModule("ITS");
336 Float_t noiseP, noiseN;
337 fResponse->GetNoiseParam(noiseP,noiseN);
339 char opt[30],dummy[20];
340 fResponse->ParamOptions(opt,dummy);
343 if (strstr(opt,"SetInvalid")) {
344 printf("invalid option %s\n",opt);
345 // Set signal = 0 if invalid strip
346 for(i=0; i<fNstrips; i++) {
347 if (!(fDCS->IsValidP(i))) (*fP)[i] = 0;
348 if (!(fDCS->IsValidN(i))) (*fN)[i] = 0;
352 Int_t digits[3], tracks[3], hits[3];
355 for(i=0;i<3;i++) tracks[i]=-3;
356 for(i=0; i<fNstrips; i++) {
357 if( (strstr(opt,"SetInvalid") && (*fP)[i] < noiseP*4) || !(*fP)[i]) continue;
360 digits[2]=(int)(*fP)[i];
361 for(j=0; j<(fTracksP+i)->GetNTracks(); j++) {
363 if((fTracksP+i)->GetNTracks()) tracks[j]=(fTracksP+i)->GetTrack(j);
365 //printf("P side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
369 its->AddSimDigit(2,phys,digits,tracks,hits,charges);
371 //cout << (fTracksP+i)->GetNTracks();
373 //if ((fTracksP+i)->GetNTracks() == 0) {
374 // cout << d.fCoord2 << " " << d.fSignal << "\n";
379 for(i=0; i<fNstrips; i++) {
380 if( (strstr(opt,"SetInvalid") && (*fN)[i] < noiseN*4)|| !(*fN)[i]) continue;
383 digits[2]=(int)(*fN)[i];
384 for( j=0; j<(fTracksN+i)->GetNTracks(); j++) {
386 if((fTracksN+i)->GetNTracks()) tracks[j]=(fTracksN+i)->GetTrack(j);
388 //printf("N side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
392 its->AddSimDigit(2,phys,digits,tracks,hits,charges);
394 //cout << (fTracksN+i)->GetNTracks();
395 //if ((fTracksN+i)->GetNTracks() == 0) {
396 // cout << d.fCoord2 << " " << d.fSignal << "\n";
403 //____________________________________________________________________________
405 Float_t AliITSsimulationSSD::F(Float_t x, Float_t s) {
406 // Computes the integral of a gaussian at the mean valuse x with sigma s.
407 //printf("SDD:F(%e,%e)\n",x,s);
410 if(s) fval=0.5*TMath::Erf(x * fPitch / s) ;
412 Error("SSD simulation: F","sigma is zero!!!",s);
417 //______________________________________________________________________
419 Float_t AliITSsimulationSSD::Get2Strip(Int_t flag, Int_t iStrip, Float_t x, Float_t z){
420 // Returns the relative space between two strips.
422 // flag==1 for Pside, 0 for Nside
424 Float_t stereoP, stereoN;
425 fSegmentation->Angles(stereoP,stereoN);
427 Float_t tanP=TMath::Tan(stereoP);
428 Float_t tanN=TMath::Tan(stereoN);
430 Float_t dx = fSegmentation->Dx();
431 Float_t dz = fSegmentation->Dz();
437 if (flag) return (x - z*tanP) / fPitch - iStrip; // from 0 to 1
438 else return (x - tanN*(dz - z)) / fPitch - iStrip;
440 //____________________________________________________________________________