[u/mrichter/AliRoot.git] / ITS / AliITSsimulationSSD.cxx


#include <stdio.h>
#include <TObjArray.h>
#include <TRandom.h>

#include "AliITSsegmentationSSD.h"
#include "AliITSresponseSSD.h"
#include "AliITSsimulationSSD.h"
#include "AliITSdictSSD.h"
#include "AliITSdcsSSD.h"
#include "AliITS.h"
#include "AliITShit.h"
#include "AliITSdigit.h"
#include "AliITSmodule.h"
#include "AliRun.h"


ClassImp(AliITSsimulationSSD);
//------------------------------------------------------------
AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg,
                                         AliITSresponse *resp){
  // Constructor


    fSegmentation = seg;
    fResponse = resp;
    fDCS = new AliITSdcsSSD(seg,resp); 

    fNstrips = fSegmentation->Npx();
    fPitch = fSegmentation->Dpx(0);
    
    fP = new TArrayF(fNstrips+1); 
    fN = new TArrayF(fNstrips+1);
     
    fTracksP = new AliITSdictSSD[fNstrips+1];
    fTracksN = new AliITSdictSSD[fNstrips+1];

    
    fSteps  = 10;   // still hard-wired - set in SetDetParam and get it via  
                     // fDCS together with the others eventually    

}
//___________________________________________________________________________
AliITSsimulationSSD& AliITSsimulationSSD::operator=(AliITSsimulationSSD 
                                                                      &source){
// Operator =
    if(this==&source) return *this;

    this->fDCS = new AliITSdcsSSD(*(source.fDCS));
    this->fN   = new TArrayF(*(source.fN));
    this->fP   = new TArrayF(*(source.fP));
    this->fTracksP = new AliITSdictSSD(*(source.fTracksP));
    this->fTracksN = new AliITSdictSSD(*(source.fTracksN));
    this->fNstrips = source.fNstrips;
    this->fPitch   = source.fPitch;
    this->fSteps   = source.fSteps;
    return *this;
}
//_____________________________________________________________
AliITSsimulationSSD::AliITSsimulationSSD(AliITSsimulationSSD &source){
  // copy constructor
   *this = source;
}
//____________________________________________________________________________
AliITSsimulationSSD::~AliITSsimulationSSD() {
  // anihilator 


    if(fP) delete fP;
    if(fN) delete fN;

    if(fTracksP) delete [] fTracksP;
    if(fTracksN) delete [] fTracksN;

    delete fDCS;

} 
//_______________________________________________________________
//
// Hit to digit
//_______________________________________________________________
//
void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t module,
                                         Int_t dummy) {
  // Digitizes one SSD module of hits.
    
    TObjArray *hits = mod->GetHits();
    Int_t nhits = hits->GetEntriesFast();
    if (!nhits) return;

    //printf("simSSD: module nhits %d %d\n",module,nhits);

    Int_t i;
    for(i=0; i<fNstrips; i++) {
       (*fP)[i] = 0;
       (*fN)[i] = 0;
       fTracksP[i].ZeroTracks();
       fTracksN[i].ZeroTracks();
    }
    
    //unsafe code but that's it for the moment
    for(i=0; i<nhits; i++) {
       HitToDigit(i,nhits,hits);
    }
 
   
    ApplyNoise();
    ApplyCoupling();    
    ApplyThreshold();
    ApplyDAQ();
      

}

//---------------------------------------------------------------

void AliITSsimulationSSD::HitToDigit(Int_t & hitNo,
                                     Int_t nhits,TObjArray *hits) {
  // Turns one or more hits in an SSD module into one or more digits.
     
    Int_t      track = -3;
    Float_t    ionization = 0;
    
    AliITSdictSSD *dict;  
    

    // check if this is the right order !!!!!


    AliITShit *hitI = (AliITShit*)hits->At(hitNo++);
    AliITShit *hitE = (AliITShit*)hits->At(hitNo);

    while (!((hitE->StatusExiting()) || 
             (hitE->StatusDisappeared()) ||
             (hitE->StatusStop()))) {
        if (++hitNo<nhits) {
           ionization = hitE->GetIonization(); 
           hitE = (AliITShit*)hits->At(hitNo);
        }
    }   
    
        
    if (hitI->GetTrack() == hitE->GetTrack()) 
       track = hitI->GetTrack();
    else 
       printf("!!! Emergency !!!\n");
     
            
    ionization += hitE->GetIonization();
       
    const Float_t kconvm=10000.;  // cm -> microns

    Float_t xI, yI, zI;
    hitI->GetPositionL(xI, yI, zI);
    
    xI *= kconvm;
    yI *= kconvm;
    zI *= kconvm;
    
    Float_t xE, yE, zE;
    hitE->GetPositionL(xE, yE, zE);
    
    xE *= kconvm;
    yE *= kconvm;
    zE *= kconvm;

    Float_t dx = (xE - xI);
    Float_t dz = (zE - zI);
    
    const Float_t kconv = 1.0e9 / 3.6;  // GeV -> e-hole pairs

    Float_t enStep = kconv*ionization/fSteps;
        
    dx /= fSteps;
    dz /= fSteps;  

    Float_t sigmaP, sigmaN; 
    fResponse->SigmaSpread(sigmaP,sigmaN); 

    Float_t noiseP, noiseN;
    fResponse->GetNoiseParam(noiseP,noiseN);


    Int_t stripP,stripN;
    Float_t    dsP=0, dsN=0;
    Float_t    sP=0, sN=0;
    Float_t signal=0;
    for(Int_t i=0; i<fSteps; i++) {
        Int_t j;
        fSegmentation->GetPadIxz(xI,zI,stripP,stripN);

        dsP    = Get2Strip(1,stripP,xI, zI); // Between 0-1
        dsN    = Get2Strip(0,stripN,xI, zI); // Between 0-1

        //sP = sigmaP * sqrt(300. * i / (fSteps));
        //sN = sigmaN * sqrt(300. * i /(fSteps-i));

        sP = sigmaP * sqrt(300. * (i+1) / (fSteps));
        sN = sigmaN * sqrt(300. * (i+1) /(fSteps-i));


        sP = (i<2        && dsP>0.3 && dsP<0.7)? 20. : sP;  // square of (microns) 
        sN = (i>fSteps-2 && dsN>0.3 && dsN<0.7)? 20. : sN;  // square of (microns) 

        sP = (i==2 && dsP>0.4 && dsP<0.6)? 15. : sP;  // square of (microns) 
        sN = (i==8 && dsN>0.4 && dsN<0.6)? 15. : sN;  // square of (microns) 
        
        for (j=-1; j<2; j++) {
            if (stripP+j<0 || stripP+j>fNstrips) continue;
            signal = enStep * TMath::Abs( (F(j+0.5-dsP,sP)-F(j-0.5-dsP,sP)) );
	    if (signal > noiseP/fSteps) {
               (*fP)[stripP+j] += signal;
               dict = (fTracksP+stripP+j);   
               (*dict).AddTrack(track);
            } 
	}  // end for j loop over neighboring strips

        for (j=-1; j<2; j++) {
            if (stripN+j<0 || stripN+j>fNstrips) continue;
            signal = enStep * TMath::Abs( (F(j+0.5-dsN,sN)-F(j-0.5-dsN,sN)) );
            if (signal > noiseN/fSteps) {
               (*fN)[stripN+j] += signal;
               dict = (fTracksN+stripN+j);    //co to jest
               (*dict).AddTrack(track);
            } 
        }  // end for j loop over neighboring strips
                
        xI += dx; 
        zI += dz; 
    }
    
    
}


//____________________________________________________________________
//
//  Private Methods for Simulation
//______________________________________________________________________
//

void AliITSsimulationSSD::ApplyNoise() {
  // Apply Noise.
   Float_t noiseP, noiseN;
   fResponse->GetNoiseParam(noiseP,noiseN);
       
    Int_t i;
    for(i = 0; i<fNstrips; i++) {
       (*fP)[i] += gRandom->Gaus(0,noiseP);
       (*fN)[i] += gRandom->Gaus(0,noiseN);
    }
}

//_________________________________________________________________________

void AliITSsimulationSSD::ApplyCoupling() {
  // Apply the effecto of electronic coupling between channels    
    Int_t i;
    for(i = 1; i<fNstrips-1; i++) {
      (*fP)[i] += (*fP)[i-1]*fDCS->GetCouplingPL() + (*fP)[i+1]*fDCS->GetCouplingPR();
      (*fN)[i] += (*fN)[i-1]*fDCS->GetCouplingNL() + (*fN)[i+1]*fDCS->GetCouplingNR();
    }
}

//__________________________________________________________________________

void AliITSsimulationSSD::ApplyThreshold() {
  // Applies the effect of a threshold on the signals for digitization.
   Float_t noiseP, noiseN;
   fResponse->GetNoiseParam(noiseP,noiseN);

   // or introduce the SetThresholds in fResponse  

    Int_t i;
    for(i=0; i<fNstrips; i++) {
       (*fP)[i] = ((*fP)[i] > noiseP*4) ? (*fP)[i] : 0;
       (*fN)[i] = ((*fN)[i] > noiseN*4) ? (*fN)[i] : 0; 
    }
        
}

//__________________________________________________________________________

void AliITSsimulationSSD::ApplyDAQ() {
  // Converts simulated signals to simulated ADC counts
    AliITS *its=(AliITS*)gAlice->GetModule("ITS");

    Float_t noiseP, noiseN;
    fResponse->GetNoiseParam(noiseP,noiseN);

    char opt[30],dummy[20];
    fResponse->ParamOptions(opt,dummy);

    Int_t i,j;
    if (strstr(opt,"SetInvalid")) {
      printf("invalid option %s\n",opt);
      // Set signal = 0 if invalid strip
      for(i=0; i<fNstrips; i++) {
         if (!(fDCS->IsValidP(i))) (*fP)[i] = 0;
	 if (!(fDCS->IsValidN(i))) (*fN)[i] = 0;
      }
    }
    
    Int_t digits[3], tracks[3], hits[3];
    Float_t charges[3];
    Float_t phys=0;
    for(i=0;i<3;i++) tracks[i]=-3;
    for(i=0; i<fNstrips; i++) { 
       if( (strstr(opt,"SetInvalid") && (*fP)[i] < noiseP*4) || !(*fP)[i]) continue;
          digits[0]=1;
          digits[1]=i;
          digits[2]=(int)(*fP)[i];
          for(j=0; j<(fTracksP+i)->GetNTracks(); j++) {
            if(j>2) continue;
	    if((fTracksP+i)->GetNTracks()) tracks[j]=(fTracksP+i)->GetTrack(j);
	    else tracks[j]=-2;
	    //printf("P side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
	    charges[j] = 0;
	    hits[j] = -1;
          }
          its->AddSimDigit(2,phys,digits,tracks,hits,charges);
          
          //cout << (fTracksP+i)->GetNTracks(); 
          //
	  //if ((fTracksP+i)->GetNTracks() == 0) {
          //   cout << d.fCoord2 << " " << d.fSignal << "\n"; 
          //}
    }
    
    
    for(i=0; i<fNstrips; i++) {
       if( (strstr(opt,"SetInvalid") && (*fN)[i] < noiseN*4)|| !(*fN)[i]) continue;
          digits[0]=0;
          digits[1]=i;
          digits[2]=(int)(*fN)[i];
          for( j=0; j<(fTracksN+i)->GetNTracks(); j++) {
            if(j>2) continue;
            if((fTracksN+i)->GetNTracks()) tracks[j]=(fTracksN+i)->GetTrack(j);
	    else tracks[j]=-2;
	    //printf("N side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
            charges[j] = 0;
	    hits[j] = -1;
          }
          its->AddSimDigit(2,phys,digits,tracks,hits,charges);
          
          //cout << (fTracksN+i)->GetNTracks();
          //if ((fTracksN+i)->GetNTracks() == 0) {
          //   cout << d.fCoord2 << " " << d.fSignal << "\n"; 
          //}
    }
    
}


//____________________________________________________________________________

Float_t AliITSsimulationSSD::F(Float_t x, Float_t s) {
  // Computes the integral of a gaussian at the mean valuse x with sigma s.
    //printf("SDD:F(%e,%e)\n",x,s);

    Float_t fval=0;
    if(s) fval=0.5*TMath::Erf(x * fPitch / s) ;
    else {
      Error("SSD simulation: F","sigma is zero!!!",s);
    }
    return fval;
} 

//______________________________________________________________________

Float_t AliITSsimulationSSD::Get2Strip(Int_t flag, Int_t iStrip, Float_t x, Float_t z){
  // Returns the relative space between two strips.

    // flag==1 for Pside, 0 for Nside

    Float_t stereoP, stereoN;
    fSegmentation->Angles(stereoP,stereoN);
    
    Float_t tanP=TMath::Tan(stereoP);
    Float_t tanN=TMath::Tan(stereoN);
 
    Float_t dx = fSegmentation->Dx();
    Float_t dz = fSegmentation->Dz();


     x += dx/2;
     z += dz/2; 
    
     if (flag) return (x - z*tanP) / fPitch - iStrip;       // from 0 to 1
     else  return (x - tanN*(dz - z)) / fPitch - iStrip;
}
//____________________________________________________________________________
Commit	Line	Data
b0f5e3fc	1
	2	#include <stdio.h>
	3	#include <TObjArray.h>
1ca7869b	4	#include <TRandom.h>
b0f5e3fc	5
9e8d6423	6	#include "AliITSsegmentationSSD.h"
9e8d6423	7	#include "AliITSresponseSSD.h"
b0f5e3fc	8	#include "AliITSsimulationSSD.h"
	9	#include "AliITSdictSSD.h"
	10	#include "AliITSdcsSSD.h"
	11	#include "AliITS.h"
9e8d6423	12	#include "AliITShit.h"
	13	#include "AliITSdigit.h"
	14	#include "AliITSmodule.h"
b0f5e3fc	15	#include "AliRun.h"
	16
	17
	18	ClassImp(AliITSsimulationSSD);
	19	//------------------------------------------------------------
	20	AliITSsimulationSSD::AliITSsimulationSSD(AliITSsegmentation *seg,
	21	AliITSresponse *resp){
	22	// Constructor
	23
9e8d6423	24
b0f5e3fc	25	fSegmentation = seg;
	26	fResponse = resp;
	27	fDCS = new AliITSdcsSSD(seg,resp);
	28
	29	fNstrips = fSegmentation->Npx();
	30	fPitch = fSegmentation->Dpx(0);
	31
e8189707	32	fP = new TArrayF(fNstrips+1);
e8189707	33	fN = new TArrayF(fNstrips+1);
b0f5e3fc	34
e8189707	35	fTracksP = new AliITSdictSSD[fNstrips+1];
	36	fTracksN = new AliITSdictSSD[fNstrips+1];
	37
b0f5e3fc	38
	39	fSteps = 10; // still hard-wired - set in SetDetParam and get it via
	40	// fDCS together with the others eventually
	41
b0f5e3fc	42	}
	43	//___________________________________________________________________________
	44	AliITSsimulationSSD& AliITSsimulationSSD::operator=(AliITSsimulationSSD
	45	&source){
	46	// Operator =
	47	if(this==&source) return *this;
	48
	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;
	57	return *this;
	58	}
	59	//_____________________________________________________________
	60	AliITSsimulationSSD::AliITSsimulationSSD(AliITSsimulationSSD &source){
	61	// copy constructor
	62	*this = source;
	63	}
	64	//____________________________________________________________________________
	65	AliITSsimulationSSD::~AliITSsimulationSSD() {
9e8d6423	66	// anihilator
9e8d6423	67
e8189707	68
b0f5e3fc	69	if(fP) delete fP;
b0f5e3fc	70	if(fN) delete fN;
9e8d6423	71
	72	if(fTracksP) delete [] fTracksP;
	73	if(fTracksN) delete [] fTracksN;
b0f5e3fc	74
b0f5e3fc	75	delete fDCS;
9e8d6423	76
b0f5e3fc	77	}
	78	//_______________________________________________________________
	79	//
	80	// Hit to digit
	81	//_______________________________________________________________
	82	//
	83	void AliITSsimulationSSD::DigitiseModule(AliITSmodule *mod,Int_t module,
	84	Int_t dummy) {
	85	// Digitizes one SSD module of hits.
	86
	87	TObjArray *hits = mod->GetHits();
	88	Int_t nhits = hits->GetEntriesFast();
b0f5e3fc	89	if (!nhits) return;
b0f5e3fc	90
9e8d6423	91	//printf("simSSD: module nhits %d %d\n",module,nhits);
9e8d6423	92
b0f5e3fc	93	Int_t i;
	94	for(i=0; i<fNstrips; i++) {
	95	(*fP)[i] = 0;
	96	(*fN)[i] = 0;
	97	fTracksP[i].ZeroTracks();
	98	fTracksN[i].ZeroTracks();
	99	}
	100
957d57f9	101	//unsafe code but that's it for the moment
b0f5e3fc	102	for(i=0; i<nhits; i++) {
957d57f9	103	HitToDigit(i,nhits,hits);
b0f5e3fc	104	}
	105
	106
e8189707	107
b0f5e3fc	108	ApplyNoise();
	109	ApplyCoupling();
	110	ApplyThreshold();
	111	ApplyDAQ();
	112
	113
	114	}
	115
	116	//---------------------------------------------------------------
	117
957d57f9	118	void AliITSsimulationSSD::HitToDigit(Int_t & hitNo,
b0f5e3fc	119	Int_t nhits,TObjArray *hits) {
	120	// Turns one or more hits in an SSD module into one or more digits.
	121
9e8d6423	122	Int_t track = -3;
b0f5e3fc	123	Float_t ionization = 0;
b0f5e3fc	124
	125	AliITSdictSSD *dict;
	126
957d57f9	127
b0f5e3fc	128	// check if this is the right order !!!!!
b0f5e3fc	129
957d57f9	130
b0f5e3fc	131	AliITShit hitI = (AliITShit)hits->At(hitNo++);
	132	AliITShit hitE = (AliITShit)hits->At(hitNo);
	133
b0f5e3fc	134	while (!((hitE->StatusExiting()) \|\|
	135	(hitE->StatusDisappeared()) \|\|
	136	(hitE->StatusStop()))) {
b0f5e3fc	137	if (++hitNo<nhits) {
	138	ionization = hitE->GetIonization();
	139	hitE = (AliITShit*)hits->At(hitNo);
	140	}
	141	}
	142
	143
	144	if (hitI->GetTrack() == hitE->GetTrack())
b0f5e3fc	145	track = hitI->GetTrack();
	146	else
	147	printf("!!! Emergency !!!\n");
	148
	149
	150	ionization += hitE->GetIonization();
	151
	152	const Float_t kconvm=10000.; // cm -> microns
	153
	154	Float_t xI, yI, zI;
	155	hitI->GetPositionL(xI, yI, zI);
	156
b0f5e3fc	157	xI *= kconvm;
	158	yI *= kconvm;
	159	zI *= kconvm;
	160
	161	Float_t xE, yE, zE;
	162	hitE->GetPositionL(xE, yE, zE);
	163
b0f5e3fc	164	xE *= kconvm;
	165	yE *= kconvm;
	166	zE *= kconvm;
	167
	168	Float_t dx = (xE - xI);
	169	Float_t dz = (zE - zI);
b0f5e3fc	170
b0f5e3fc	171	const Float_t kconv = 1.0e9 / 3.6; // GeV -> e-hole pairs
957d57f9	172
957d57f9	173	Float_t enStep = kconv*ionization/fSteps;
b0f5e3fc	174
	175	dx /= fSteps;
	176	dz /= fSteps;
	177
	178	Float_t sigmaP, sigmaN;
	179	fResponse->SigmaSpread(sigmaP,sigmaN);
	180
b0f5e3fc	181	Float_t noiseP, noiseN;
	182	fResponse->GetNoiseParam(noiseP,noiseN);
	183
b0f5e3fc	184
957d57f9	185	Int_t stripP,stripN;
	186	Float_t dsP=0, dsN=0;
	187	Float_t sP=0, sN=0;
	188	Float_t signal=0;
	189	for(Int_t i=0; i<fSteps; i++) {
b0f5e3fc	190	Int_t j;
e8189707	191	fSegmentation->GetPadIxz(xI,zI,stripP,stripN);
957d57f9	192
b0f5e3fc	193	dsP = Get2Strip(1,stripP,xI, zI); // Between 0-1
	194	dsN = Get2Strip(0,stripN,xI, zI); // Between 0-1
	195
9e8d6423	196	//sP = sigmaP * sqrt(300. * i / (fSteps));
	197	//sN = sigmaN * sqrt(300. * i /(fSteps-i));
	198
	199	sP = sigmaP * sqrt(300. * (i+1) / (fSteps));
	200	sN = sigmaN * sqrt(300. * (i+1) /(fSteps-i));
b0f5e3fc	201
	202
	203	sP = (i<2 && dsP>0.3 && dsP<0.7)? 20. : sP; // square of (microns)
	204	sN = (i>fSteps-2 && dsN>0.3 && dsN<0.7)? 20. : sN; // square of (microns)
	205
	206	sP = (i==2 && dsP>0.4 && dsP<0.6)? 15. : sP; // square of (microns)
957d57f9	207	sN = (i==8 && dsN>0.4 && dsN<0.6)? 15. : sN; // square of (microns)
9e8d6423	208
e8189707	209	for (j=-1; j<2; j++) {
b0f5e3fc	210	if (stripP+j<0 \|\| stripP+j>fNstrips) continue;
957d57f9	211	signal = enStep * TMath::Abs( (F(j+0.5-dsP,sP)-F(j-0.5-dsP,sP)) );
b0f5e3fc	212	if (signal > noiseP/fSteps) {
	213	(*fP)[stripP+j] += signal;
	214	dict = (fTracksP+stripP+j);
	215	(*dict).AddTrack(track);
	216	}
	217	} // end for j loop over neighboring strips
e8189707	218
e8189707	219	for (j=-1; j<2; j++) {
b0f5e3fc	220	if (stripN+j<0 \|\| stripN+j>fNstrips) continue;
957d57f9	221	signal = enStep * TMath::Abs( (F(j+0.5-dsN,sN)-F(j-0.5-dsN,sN)) );
b0f5e3fc	222	if (signal > noiseN/fSteps) {
	223	(*fN)[stripN+j] += signal;
	224	dict = (fTracksN+stripN+j); //co to jest
	225	(*dict).AddTrack(track);
	226	}
	227	} // end for j loop over neighboring strips
	228
	229	xI += dx;
	230	zI += dz;
	231	}
	232
	233
	234	}
	235
	236
	237	//____________________________________________________________________
	238	//
	239	// Private Methods for Simulation
	240	//______________________________________________________________________
	241	//
	242
	243	void AliITSsimulationSSD::ApplyNoise() {
	244	// Apply Noise.
	245	Float_t noiseP, noiseN;
	246	fResponse->GetNoiseParam(noiseP,noiseN);
	247
	248	Int_t i;
	249	for(i = 0; i<fNstrips; i++) {
	250	(*fP)[i] += gRandom->Gaus(0,noiseP);
	251	(*fN)[i] += gRandom->Gaus(0,noiseN);
	252	}
	253	}
	254
	255	//_________________________________________________________________________
	256
	257	void AliITSsimulationSSD::ApplyCoupling() {
	258	// Apply the effecto of electronic coupling between channels
b0f5e3fc	259	Int_t i;
	260	for(i = 1; i<fNstrips-1; i++) {
	261	(fP)[i] += (fP)[i-1]fDCS->GetCouplingPL() + (fP)[i+1]*fDCS->GetCouplingPR();
	262	(fN)[i] += (fN)[i-1]fDCS->GetCouplingNL() + (fN)[i+1]*fDCS->GetCouplingNR();
	263	}
	264	}
	265
	266	//__________________________________________________________________________
	267
	268	void AliITSsimulationSSD::ApplyThreshold() {
	269	// Applies the effect of a threshold on the signals for digitization.
	270	Float_t noiseP, noiseN;
	271	fResponse->GetNoiseParam(noiseP,noiseN);
	272
	273	// or introduce the SetThresholds in fResponse
	274
	275	Int_t i;
	276	for(i=0; i<fNstrips; i++) {
	277	(fP)[i] = ((fP)[i] > noiseP4) ? (fP)[i] : 0;
	278	(fN)[i] = ((fN)[i] > noiseN4) ? (fN)[i] : 0;
b0f5e3fc	279	}
	280
	281	}
	282
	283	//__________________________________________________________________________
	284
	285	void AliITSsimulationSSD::ApplyDAQ() {
	286	// Converts simulated signals to simulated ADC counts
	287	AliITS its=(AliITS)gAlice->GetModule("ITS");
	288
	289	Float_t noiseP, noiseN;
	290	fResponse->GetNoiseParam(noiseP,noiseN);
	291
e8189707	292	char opt[30],dummy[20];
	293	fResponse->ParamOptions(opt,dummy);
	294
b0f5e3fc	295	Int_t i,j;
e8189707	296	if (strstr(opt,"SetInvalid")) {
9e8d6423	297	printf("invalid option %s\n",opt);
e8189707	298	// Set signal = 0 if invalid strip
	299	for(i=0; i<fNstrips; i++) {
	300	if (!(fDCS->IsValidP(i))) (*fP)[i] = 0;
	301	if (!(fDCS->IsValidN(i))) (*fN)[i] = 0;
	302	}
b0f5e3fc	303	}
b0f5e3fc	304
e8189707	305	Int_t digits[3], tracks[3], hits[3];
b0f5e3fc	306	Float_t charges[3];
b0f5e3fc	307	Float_t phys=0;
9e8d6423	308	for(i=0;i<3;i++) tracks[i]=-3;
b0f5e3fc	309	for(i=0; i<fNstrips; i++) {
e8189707	310	if( (strstr(opt,"SetInvalid") && (fP)[i] < noiseP4) \|\| !(*fP)[i]) continue;
b0f5e3fc	311	digits[0]=1;
	312	digits[1]=i;
	313	digits[2]=(int)(*fP)[i];
	314	for(j=0; j<(fTracksP+i)->GetNTracks(); j++) {
e8189707	315	if(j>2) continue;
	316	if((fTracksP+i)->GetNTracks()) tracks[j]=(fTracksP+i)->GetTrack(j);
	317	else tracks[j]=-2;
9e8d6423	318	//printf("P side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
e8189707	319	charges[j] = 0;
e8189707	320	hits[j] = -1;
b0f5e3fc	321	}
e8189707	322	its->AddSimDigit(2,phys,digits,tracks,hits,charges);
b0f5e3fc	323
9e8d6423	324	//cout << (fTracksP+i)->GetNTracks();
	325	//
	326	//if ((fTracksP+i)->GetNTracks() == 0) {
	327	// cout << d.fCoord2 << " " << d.fSignal << "\n";
	328	//}
b0f5e3fc	329	}
	330
	331
	332	for(i=0; i<fNstrips; i++) {
e8189707	333	if( (strstr(opt,"SetInvalid") && (fN)[i] < noiseN4)\|\| !(*fN)[i]) continue;
b0f5e3fc	334	digits[0]=0;
	335	digits[1]=i;
	336	digits[2]=(int)(*fN)[i];
e8189707	337	for( j=0; j<(fTracksN+i)->GetNTracks(); j++) {
	338	if(j>2) continue;
	339	if((fTracksN+i)->GetNTracks()) tracks[j]=(fTracksN+i)->GetTrack(j);
	340	else tracks[j]=-2;
9e8d6423	341	//printf("N side: i,j,tracks[j] %d %d %d\n",i,j,tracks[j]);
e8189707	342	charges[j] = 0;
e8189707	343	hits[j] = -1;
b0f5e3fc	344	}
e8189707	345	its->AddSimDigit(2,phys,digits,tracks,hits,charges);
b0f5e3fc	346
9e8d6423	347	//cout << (fTracksN+i)->GetNTracks();
	348	//if ((fTracksN+i)->GetNTracks() == 0) {
	349	// cout << d.fCoord2 << " " << d.fSignal << "\n";
	350	//}
b0f5e3fc	351	}
	352
	353	}
	354
	355
	356	//____________________________________________________________________________
	357
	358	Float_t AliITSsimulationSSD::F(Float_t x, Float_t s) {
	359	// Computes the integral of a gaussian at the mean valuse x with sigma s.
	360	//printf("SDD:F(%e,%e)\n",x,s);
9e8d6423	361
	362	Float_t fval=0;
	363	if(s) fval=0.5TMath::Erf(x fPitch / s) ;
	364	else {
	365	Error("SSD simulation: F","sigma is zero!!!",s);
	366	}
	367	return fval;
b0f5e3fc	368	}
	369
	370	//______________________________________________________________________
	371
	372	Float_t AliITSsimulationSSD::Get2Strip(Int_t flag, Int_t iStrip, Float_t x, Float_t z){
	373	// Returns the relative space between two strips.
	374
	375	// flag==1 for Pside, 0 for Nside
	376
	377	Float_t stereoP, stereoN;
	378	fSegmentation->Angles(stereoP,stereoN);
	379
	380	Float_t tanP=TMath::Tan(stereoP);
	381	Float_t tanN=TMath::Tan(stereoN);
	382
	383	Float_t dx = fSegmentation->Dx();
	384	Float_t dz = fSegmentation->Dz();
	385
	386
	387	x += dx/2;
	388	z += dz/2;
	389
	390	if (flag) return (x - z*tanP) / fPitch - iStrip; // from 0 to 1
	391	else return (x - tanN*(dz - z)) / fPitch - iStrip;
	392	}
	393	//____________________________________________________________________________