6 #include "AliITSsegmentationSSD.h"
7 #include "AliITSresponseSSD.h"
8 #include "AliITSsimulationSSD.h"
9 #include "AliITSdictSSD.h"
10 #include "AliITSdcsSSD.h"
12 #include "AliITShit.h"
13 #include "AliITSdigit.h"
14 #include "AliITSmodule.h"
18 ClassImp(AliITSsimulationSSD);
19 //------------------------------------------------------------
20 AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg,
21 AliITSresponse *resp){
27 fDCS = new AliITSdcsSSD(seg,resp);
29 fNstrips = fSegmentation->Npx();
30 fPitch = fSegmentation->Dpx(0);
32 fP = new TArrayF(fNstrips+1);
33 fN = new TArrayF(fNstrips+1);
35 fTracksP = new AliITSdictSSD[fNstrips+1];
36 fTracksN = new AliITSdictSSD[fNstrips+1];
39 fSteps = 10; // still hard-wired - set in SetDetParam and get it via
40 // fDCS together with the others eventually
43 //___________________________________________________________________________
44 AliITSsimulationSSD& AliITSsimulationSSD::operator=(AliITSsimulationSSD
47 if(this==&source) return *this;
49 this->fDCS = new AliITSdcsSSD(*(source.fDCS));
50 this->fN = new TArrayF(*(source.fN));
51 this->fP = new TArrayF(*(source.fP));
52 this->fTracksP = new AliITSdictSSD(*(source.fTracksP));
53 this->fTracksN = new AliITSdictSSD(*(source.fTracksN));
54 this->fNstrips = source.fNstrips;
55 this->fPitch = source.fPitch;
56 this->fSteps = source.fSteps;
59 //_____________________________________________________________
60 AliITSsimulationSSD::AliITSsimulationSSD(AliITSsimulationSSD &source){
64 //____________________________________________________________________________
65 AliITSsimulationSSD::~AliITSsimulationSSD() {
72 if(fTracksP) delete [] fTracksP;
73 if(fTracksN) delete [] fTracksN;
78 //_______________________________________________________________
81 //_______________________________________________________________
83 void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t module,
85 // Digitizes one SSD module of hits.
87 TObjArray *hits = mod->GetHits();
88 Int_t nhits = hits->GetEntriesFast();
91 //printf("simSSD: module nhits %d %d\n",module,nhits);
94 for(i=0; i<fNstrips; i++) {
97 fTracksP[i].ZeroTracks();
98 fTracksN[i].ZeroTracks();
101 for(i=0; i<nhits; i++) {
102 Int_t idtrack=mod->GetHitTrackIndex(i);
103 HitToDigit(i,idtrack,nhits,hits);
116 //---------------------------------------------------------------
118 void AliITSsimulationSSD::HitToDigit(Int_t & hitNo,Int_t idtrack,
119 Int_t nhits,TObjArray *hits) {
120 // Turns one or more hits in an SSD module into one or more digits.
122 Int_t stripP, stripN, i;
126 Float_t arrayEP[10]; // hard-wired number of steps
130 Float_t ionization = 0;
136 // check if this is the right order !!!!!
138 AliITShit *hitI = (AliITShit*)hits->At(hitNo++);
139 AliITShit *hitE = (AliITShit*)hits->At(hitNo);
142 while (!((hitE->StatusExiting()) ||
143 (hitE->StatusDisappeared()) ||
144 (hitE->StatusStop()))) {
147 ionization = hitE->GetIonization();
148 hitE = (AliITShit*)hits->At(hitNo);
153 if (hitI->GetTrack() == hitE->GetTrack())
155 track = hitI->GetTrack();
157 printf("!!! Emergency !!!\n");
160 ionization += hitE->GetIonization();
162 const Float_t kconvm=10000.; // cm -> microns
165 hitI->GetPositionL(xI, yI, zI);
172 hitE->GetPositionL(xE, yE, zE);
178 Float_t dx = (xE - xI);
179 Float_t dz = (zE - zI);
184 fSegmentation->GetPadIxz(xI,zI,stripP,stripN);
186 printf("%5d %8.3f %8.3f %8.3f %8.3f %d %d %d\n",
187 hitNo, xI, zI, dx, dz,
188 stripP, stripN, track);
189 printf("%10.5f %10d \n", ionization, hitI->fTrack);
198 for (i=0; i<fSteps; i++) {
200 // arrayEP[i] = gRandom->Landau(ionization/fSteps, ionization/(4*fSteps));
201 // arrayEN[i] = gRandom->Landau(ionization/fSteps, ionization/(4*fSteps));
202 arrayEP[i] = ionization/fSteps;
203 arrayEN[i] = ionization/fSteps;
209 const Float_t kconv = 1.0e9 / 3.6; // GeV -> e-hole pairs
211 for(i=0; i<fSteps; i++) {
213 arrayEP[i] = kconv * arrayEP[i] * (ionization / eP);
214 arrayEN[i] = kconv * arrayEN[i] * (ionization / eN);
220 Float_t sigmaP, sigmaN;
221 fResponse->SigmaSpread(sigmaP,sigmaN);
223 //printf("SigmaP SigmaN %f %f\n",sigmaP, sigmaN);
225 Float_t noiseP, noiseN;
226 fResponse->GetNoiseParam(noiseP,noiseN);
228 //printf("NoiseP NoiseN %f %f\n",noiseP, noiseN);
230 for(i=0; i<fSteps; i++) {
234 fSegmentation->GetPadIxz(xI,zI,stripP,stripN);
235 //printf("hitNo %d i xI zI stripP stripN %d %f %f %d %d\n",hitNo,i,xI, zI, stripP, stripN);
236 dsP = Get2Strip(1,stripP,xI, zI); // Between 0-1
237 dsN = Get2Strip(0,stripN,xI, zI); // Between 0-1
239 //sP = sigmaP * sqrt(300. * i / (fSteps));
240 //sN = sigmaN * sqrt(300. * i /(fSteps-i));
242 sP = sigmaP * sqrt(300. * (i+1) / (fSteps));
243 sN = sigmaN * sqrt(300. * (i+1) /(fSteps-i));
246 sP = (i<2 && dsP>0.3 && dsP<0.7)? 20. : sP; // square of (microns)
247 sN = (i>fSteps-2 && dsN>0.3 && dsN<0.7)? 20. : sN; // square of (microns)
249 sP = (i==2 && dsP>0.4 && dsP<0.6)? 15. : sP; // square of (microns)
250 sN = (i==8 && dsN>0.4 && dsN<0.6)? 15. : sN; // square of (microns)
253 //printf("i=%d SigmaP SigmaN sP sN %f %f %e %e\n",i,sigmaP, sigmaN,sP,sN);
255 for (j=-1; j<2; j++) {
256 if (stripP+j<0 || stripP+j>fNstrips) continue;
257 signal = arrayEP[i] * TMath::Abs( (F(j+0.5-dsP,sP)-F(j-0.5-dsP,sP)) );
258 //printf("SimSSD::HitsToDigits:%d arrayEP[%d]=%e signal=%e\n",j,i,arrayEP[i],signal);
259 if (signal > noiseP/fSteps) {
260 (*fP)[stripP+j] += signal;
261 dict = (fTracksP+stripP+j);
262 (*dict).AddTrack(track);
264 } // end for j loop over neighboring strips
266 for (j=-1; j<2; j++) {
267 if (stripN+j<0 || stripN+j>fNstrips) continue;
268 signal = arrayEN[i] * TMath::Abs( (F(j+0.5-dsN,sN)-F(j-0.5-dsN,sN)) );
269 //printf("SimSSD::HitsToDigits:%d arrayEN[%d]=%e signal=%e\n",j,i,arrayEN[i],signal);
270 if (signal > noiseN/fSteps) {
271 (*fN)[stripN+j] += signal;
272 dict = (fTracksN+stripN+j); //co to jest
273 (*dict).AddTrack(track);
275 } // end for j loop over neighboring strips
285 //____________________________________________________________________
287 // Private Methods for Simulation
288 //______________________________________________________________________
291 void AliITSsimulationSSD::ApplyNoise() {
293 Float_t noiseP, noiseN;
294 fResponse->GetNoiseParam(noiseP,noiseN);
297 for(i = 0; i<fNstrips; i++) {
298 (*fP)[i] += gRandom->Gaus(0,noiseP);
299 (*fN)[i] += gRandom->Gaus(0,noiseN);
303 //_________________________________________________________________________
305 void AliITSsimulationSSD::ApplyCoupling() {
306 // Apply the effecto of electronic coupling between channels
308 for(i = 1; i<fNstrips-1; i++) {
309 (*fP)[i] += (*fP)[i-1]*fDCS->GetCouplingPL() + (*fP)[i+1]*fDCS->GetCouplingPR();
310 (*fN)[i] += (*fN)[i-1]*fDCS->GetCouplingNL() + (*fN)[i+1]*fDCS->GetCouplingNR();
314 //__________________________________________________________________________
316 void AliITSsimulationSSD::ApplyThreshold() {
317 // Applies the effect of a threshold on the signals for digitization.
318 Float_t noiseP, noiseN;
319 fResponse->GetNoiseParam(noiseP,noiseN);
321 // or introduce the SetThresholds in fResponse
324 for(i=0; i<fNstrips; i++) {
325 (*fP)[i] = ((*fP)[i] > noiseP*4) ? (*fP)[i] : 0;
326 (*fN)[i] = ((*fN)[i] > noiseN*4) ? (*fN)[i] : 0;
331 //__________________________________________________________________________
333 void AliITSsimulationSSD::ApplyDAQ() {
334 // Converts simulated signals to simulated ADC counts
335 AliITS *its=(AliITS*)gAlice->GetModule("ITS");
337 Float_t noiseP, noiseN;
338 fResponse->GetNoiseParam(noiseP,noiseN);
340 char opt[30],dummy[20];
341 fResponse->ParamOptions(opt,dummy);
344 if (strstr(opt,"SetInvalid")) {
345 printf("invalid option %s\n",opt);
346 // Set signal = 0 if invalid strip
347 for(i=0; i<fNstrips; i++) {
348 if (!(fDCS->IsValidP(i))) (*fP)[i] = 0;
349 if (!(fDCS->IsValidN(i))) (*fN)[i] = 0;
353 Int_t digits[3], tracks[3], hits[3];
356 for(i=0;i<3;i++) tracks[i]=-3;
357 for(i=0; i<fNstrips; i++) {
358 if( (strstr(opt,"SetInvalid") && (*fP)[i] < noiseP*4) || !(*fP)[i]) continue;
361 digits[2]=(int)(*fP)[i];
362 for(j=0; j<(fTracksP+i)->GetNTracks(); j++) {
364 if((fTracksP+i)->GetNTracks()) tracks[j]=(fTracksP+i)->GetTrack(j);
366 //printf("P side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
370 its->AddSimDigit(2,phys,digits,tracks,hits,charges);
372 //cout << (fTracksP+i)->GetNTracks();
374 //if ((fTracksP+i)->GetNTracks() == 0) {
375 // cout << d.fCoord2 << " " << d.fSignal << "\n";
380 for(i=0; i<fNstrips; i++) {
381 if( (strstr(opt,"SetInvalid") && (*fN)[i] < noiseN*4)|| !(*fN)[i]) continue;
384 digits[2]=(int)(*fN)[i];
385 for( j=0; j<(fTracksN+i)->GetNTracks(); j++) {
387 if((fTracksN+i)->GetNTracks()) tracks[j]=(fTracksN+i)->GetTrack(j);
389 //printf("N side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
393 its->AddSimDigit(2,phys,digits,tracks,hits,charges);
395 //cout << (fTracksN+i)->GetNTracks();
396 //if ((fTracksN+i)->GetNTracks() == 0) {
397 // cout << d.fCoord2 << " " << d.fSignal << "\n";
404 //____________________________________________________________________________
406 Float_t AliITSsimulationSSD::F(Float_t x, Float_t s) {
407 // Computes the integral of a gaussian at the mean valuse x with sigma s.
408 //printf("SDD:F(%e,%e)\n",x,s);
411 if(s) fval=0.5*TMath::Erf(x * fPitch / s) ;
413 Error("SSD simulation: F","sigma is zero!!!",s);
418 //______________________________________________________________________
420 Float_t AliITSsimulationSSD::Get2Strip(Int_t flag, Int_t iStrip, Float_t x, Float_t z){
421 // Returns the relative space between two strips.
423 // flag==1 for Pside, 0 for Nside
425 Float_t stereoP, stereoN;
426 fSegmentation->Angles(stereoP,stereoN);
428 Float_t tanP=TMath::Tan(stereoP);
429 Float_t tanN=TMath::Tan(stereoN);
431 Float_t dx = fSegmentation->Dx();
432 Float_t dz = fSegmentation->Dz();
438 if (flag) return (x - z*tanP) / fPitch - iStrip; // from 0 to 1
439 else return (x - tanN*(dz - z)) / fPitch - iStrip;
441 //____________________________________________________________________________