11 #include "AliITShit.h"
12 #include "AliITSdigit.h"
13 #include "AliITSmodule.h"
14 #include "AliITSMapA2.h"
15 #include "AliITSsimulationSPDbari.h"
16 #include "AliITSsegmentation.h"
17 #include "AliITSresponse.h"
20 ClassImp(AliITSsimulationSPDbari)
21 ////////////////////////////////////////////////////////////////////////
23 // Written by Rocco Caliandro
24 // from a model developed with T. Virgili and R.A. Fini
27 // AliITSsimulationSPD is the simulation of SPDs
29 //________________________________________________________________________
31 AliITSsimulationSPDbari::AliITSsimulationSPDbari(){
41 //_____________________________________________________________________________
43 AliITSsimulationSPDbari::AliITSsimulationSPDbari(AliITSsegmentation *seg, AliITSresponse *resp) {
48 fResponse->Thresholds(fThresh,fSigma);
49 fResponse->GetNoiseParam(fCouplCol,fCouplRow);
51 fMapA2 = new AliITSMapA2(fSegmentation);
54 fNPixelsZ=fSegmentation->Npz();
55 fNPixelsX=fSegmentation->Npx();
59 //_____________________________________________________________________________
61 AliITSsimulationSPDbari::~AliITSsimulationSPDbari() {
72 //__________________________________________________________________________
73 AliITSsimulationSPDbari::AliITSsimulationSPDbari(const AliITSsimulationSPDbari &source){
75 if(&source == this) return;
76 this->fMapA2 = source.fMapA2;
77 this->fThresh = source.fThresh;
78 this->fSigma = source.fSigma;
79 this->fCouplCol = source.fCouplCol;
80 this->fCouplRow = source.fCouplRow;
81 this->fNPixelsX = source.fNPixelsX;
82 this->fNPixelsZ = source.fNPixelsZ;
83 this->fHis = source.fHis;
87 //_________________________________________________________________________
88 AliITSsimulationSPDbari&
89 AliITSsimulationSPDbari::operator=(const AliITSsimulationSPDbari &source) {
90 // Assignment operator
91 if(&source == this) return *this;
92 this->fMapA2 = source.fMapA2;
93 this->fThresh = source.fThresh;
94 this->fSigma = source.fSigma;
95 this->fCouplCol = source.fCouplCol;
96 this->fCouplRow = source.fCouplRow;
97 this->fNPixelsX = source.fNPixelsX;
98 this->fNPixelsZ = source.fNPixelsZ;
99 this->fHis = source.fHis;
102 //_____________________________________________________________________________
104 void AliITSsimulationSPDbari::DigitiseModule(AliITSmodule *mod, Int_t module,
109 TObjArray *fHits = mod->GetHits();
110 Int_t nhits = fHits->GetEntriesFast();
114 printf("Module %d (%d hits) \n",module+1,nhits);
118 Int_t *frowpixel = new Int_t[number];
119 Int_t *fcolpixel = new Int_t[number];
120 Double_t *fenepixel = new Double_t[number];
122 // Array of pointers to store the track index of the digits
123 // leave +1, otherwise pList crashes when col=256, row=192
124 Int_t maxNdigits = fNPixelsX*fNPixelsZ+fNPixelsX+1;
125 Float_t **pList = new Float_t* [maxNdigits];
126 memset(pList,0,sizeof(Float_t*)*maxNdigits);
130 SetFluctuations(pList);
134 // loop over hits in the module
136 for (hitpos=0;hitpos<nhits;hitpos++) {
137 HitToDigit(mod,hitpos,module,frowpixel,fcolpixel,fenepixel,pList);
138 }// end loop over digits
140 CreateDigit(nhits,module,pList);
150 //_____________________________________________________________________________
152 void AliITSsimulationSPDbari::UpdateMap( Int_t row, Int_t col, Double_t ene) {
154 // updates the Map of signal, adding the energy (ene) released by the current track
157 signal = fMapA2->GetSignal(row,col);
159 fMapA2->SetHit(row,col,signal);
162 //_____________________________________________________________________________
163 void AliITSsimulationSPDbari::HitToDigit(AliITSmodule *mod, Int_t hitpos, Int_t module,
164 Int_t *frowpixel, Int_t *fcolpixel,
165 Double_t *fenepixel, Float_t **pList) {
167 // Steering function to determine the digits associated to a given hit (hitpos)
168 // The digits are created by charge sharing (ChargeSharing) and by
169 // capacitive coupling (SetCoupling). At all the created digits is associated
170 // the track number of the hit (ntrack)
174 static Float_t x1l,y1l,z1l;
175 Float_t x2l,y2l,z2l,etot;
176 Int_t layer,r1,r2,c1,c2,row,col,npixel = 0;
179 const Float_t kconv = 10000.; // cm -> microns
181 TObjArray *fHits = mod->GetHits();
182 AliITShit *hit = (AliITShit*) fHits->At(hitpos);
183 layer = hit->GetLayer();
184 etot=hit->GetIonization();
185 ntrack=hit->GetTrack();
186 idhit=mod->GetHitHitIndex(hitpos);
189 printf("layer,etot,ntrack,status %d %f %d %d\n",layer,etot,ntrack,hit->GetTrackStatus()); //debug
190 Int_t idtrack; //debug
191 mod->GetHitTrackAndHitIndex(hitpos,idtrack,idhit);
192 printf("idtrack,idhit %d %d\n",idtrack,idhit); //debug
196 if (hit->GetTrackStatus()==66) {
197 hit->GetPositionL(x1l,y1l,z1l);
198 // positions shifted and converted in microns
199 x1l = x1l*kconv + fSegmentation->Dx()/2.;
200 z1l = z1l*kconv + fSegmentation->Dz()/2.;
203 hit->GetPositionL(x2l,y2l,z2l);
204 // positions shifted and converted in microns
205 x2l = x2l*kconv + fSegmentation->Dx()/2.;
206 z2l = z2l*kconv + fSegmentation->Dz()/2.;
209 // to account for 83750 effective sensitive area
210 // introduced in geometry (Dz=83600)
211 if (z1l>fSegmentation->Dz()) return;
212 if (z2l>fSegmentation->Dz()) return;
213 // to preserve for hit having x>12800
214 if (x1l>fSegmentation->Dx()) return;
215 if (x2l>fSegmentation->Dx()) return;
217 //Get the col and row number starting from 1
218 // the x direction is not inverted for the second layer!!!
219 fSegmentation->GetPadIxz(x1l, z1l, c1, r1);
220 fSegmentation->GetPadIxz(x2l, z2l, c2, r2);
222 // to account for unexpected equal entrance and
224 if (x1l==x2l) x2l=x2l+x2l*0.000001;
225 if (z1l==z2l) z2l=z2l+z2l*0.000001;
227 // to account for tracks at the edge of the sensitive area
235 if ((r1==r2) && (c1==c2))
239 frowpixel[npixel-1] = r1;
240 fcolpixel[npixel-1] = c1;
241 fenepixel[npixel-1] = etot;
245 ChargeSharing(x1l,z1l,x2l,z2l,c1,r1,c2,r2,etot,
246 npixel,frowpixel,fcolpixel,fenepixel);
251 for (Int_t npix=0;npix<npixel;npix++)
253 row = frowpixel[npix];
254 col = fcolpixel[npix];
255 ene = fenepixel[npix];
256 UpdateMap(row,col,ene);
257 GetList(ntrack,idhit,pList,row,col);
258 // Starting capacitive coupling effect
259 SetCoupling(row,col,ntrack,idhit,pList);
267 //_________________________________________________________________________
269 void AliITSsimulationSPDbari::ChargeSharing(Float_t x1l,Float_t z1l,Float_t x2l,
270 Float_t z2l,Int_t c1,Int_t r1,Int_t c2,
271 Int_t r2,Float_t etot,
272 Int_t &npixel,Int_t *frowpixel,
273 Int_t *fcolpixel,Double_t *fenepixel){
275 // Take into account the geometrical charge sharing when the track
276 // crosses more than one pixel.
280 <img src="picts/ITS/barimodel_2.gif">
283 <font size=+2 color=red>
284 <a href="mailto:Rocco.Caliandro@ba.infn.it"></a>.
291 Float_t xa,za,xb,zb,dx,dz,dtot,dm,refr,refm,refc;
293 Float_t arefm, arefr, arefn, arefc, azb, az2l, axb, ax2l;
294 Int_t dirx,dirz,rb,cb;
297 Int_t flag,flagrow,flagcol;
305 dx = TMath::Abs(x1l-x2l);
306 dz = TMath::Abs(z1l-z2l);
307 dtot = TMath::Sqrt((dx*dx)+(dz*dz));
308 dm = (x2l - x1l) / (z2l - z1l);
310 dirx = (Int_t) ((x2l - x1l) / dx);
311 dirz = (Int_t) ((z2l - z1l) / dz);
314 // calculate the x coordinate of the pixel in the next column
315 // and the z coordinate of the pixel in the next row
319 fSegmentation->GetPadCxz(c1, r1-1, xpos, zpos);
321 Float_t xsize = fSegmentation->Dpx(0);
322 Float_t zsize = fSegmentation->Dpz(r1);
324 if (dirx == 1) refr = xpos+xsize/2.;
325 else refr = xpos-xsize/2.;
327 if (dirz == 1) refn = zpos+zsize/2.;
328 else refn = zpos-zsize/2.;
337 // calculate the x coordinate of the intersection with the pixel
338 // in the next cell in row direction
340 refm = (refn - z1l)*dm + x1l;
342 // calculate the z coordinate of the intersection with the pixel
343 // in the next cell in column direction
345 refc = (refr - x1l)/dm + z1l;
354 if ((arefm < arefr) && (arefn < arefc)){
356 // the track goes in the pixel in the next cell in row direction
363 if (rb == r2) flagrow=1;
369 // shift to the pixel in the next cell in row direction
370 Float_t zsizeNext = fSegmentation->Dpz(rb);
371 refn += zsizeNext*dirz;
376 // the track goes in the pixel in the next cell in column direction
383 if (cb == c2) flagcol=1;
389 // shift to the pixel in the next cell in column direction
390 Float_t xsizeNext = fSegmentation->Dpx(cb);
391 refr += xsizeNext*dirx;
395 //calculate the energy lost in the crossed pixel
396 epar = TMath::Sqrt((xb-xa)*(xb-xa)+(zb-za)*(zb-za));
397 epar = etot*(epar/dtot);
399 //store row, column and energy lost in the crossed pixel
402 frowpixel[npixel] = r1;
403 fcolpixel[npixel] = c1;
404 fenepixel[npixel] = epar;
407 // the exit point of the track is reached
408 if (epar == 0) flag = 1;
409 if ((r1 == r2) && (c1 == c2)) flag = 1;
420 //___________________________________________________________________________
421 void AliITSsimulationSPDbari::SetCoupling(Int_t row, Int_t col, Int_t ntrack,
422 Int_t idhit, Float_t **pList) {
424 // Take into account the coupling between adiacent pixels.
425 // The parameters probcol and probrow are the fractions of the
426 // signal in one pixel shared in the two adjacent pixels along
427 // the column and row direction, respectively.
431 <img src="picts/ITS/barimodel_3.gif">
434 <font size=+2 color=red>
435 <a href="mailto:Rocco.Caliandro@ba.infn.it"></a>.
443 Double_t pulse1,pulse2;
449 pulse1 = fMapA2->GetSignal(row,col);
452 for (Int_t isign=-1;isign<=1;isign+=2)
455 // loop in row direction
462 if ((j1 < 0) || (j1 > fNPixelsZ-1) || (pulse1 < fThresh))
464 pulse1 = fMapA2->GetSignal(row,col);
469 UpdateMap(j1,col,pulse1);
470 GetList(ntrack,idhit,pList,j1,col);
477 // loop in column direction
484 if ((j2 < 0) || (j2 > (fNPixelsX-1)) || (pulse2 < fThresh))
486 pulse2 = fMapA2->GetSignal(row,col);
491 UpdateMap(row,j2,pulse2);
492 GetList(ntrack,idhit,pList,row,j2);
501 //___________________________________________________________________________
502 void AliITSsimulationSPDbari::CreateDigit(Int_t nhits, Int_t module, Float_t
505 // The pixels are fired if the energy deposited inside them is above
506 // the threshold parameter ethr. Fired pixed are interpreted as digits
507 // and stored in the file digitfilename.
510 AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
521 for (Int_t r=1;r<=fNPixelsZ;r++) {
522 for (Int_t c=1;c<=fNPixelsX;c++) {
524 // check if the deposited energy in a pixel is above the threshold
525 Float_t signal = (Float_t) fMapA2->GetSignal(r,c);
526 if ( signal > fThresh) {
527 digits[0] = r-1; // digits starts from 0
528 digits[1] = c-1; // digits starts from 0
530 signal = signal*1.0e9; //signal in eV
531 digits[2] = (Int_t) signal; // the signal is stored in eV
532 gi =r*fNPixelsX+c; // global index
534 tracks[j1] = (Int_t)(*(pList[gi]+j1));
535 hits[j1] = (Int_t)(*(pList[gi]+j1+6));
539 printf("digits %d %d %d\n",digits[0],digits[1],digits[2]); //debug
540 printf("tracks %d %d %d\n",tracks[0],tracks[1],tracks[2]); //debug
541 printf("hits %d %d %d\n",hits[0],hits[1],hits[2]); //debug
544 aliITS->AddSimDigit(0,phys,digits,tracks,hits,charges);
545 if(pList[gi]) delete [] pList[gi];
546 }//endif of threshold condition
552 //_____________________________________________________________________________
554 void AliITSsimulationSPDbari::GetList(Int_t label,Int_t idhit, Float_t **pList,
555 Int_t row, Int_t col) {
556 // loop over nonzero digits
562 Float_t highest,middle,lowest;
565 signal=fMapA2->GetSignal(iz,ix);
567 globalIndex = iz*fNPixelsX+ix; // globalIndex starts from 1
570 if(!pList[globalIndex])
573 // Create new list (9 elements - 3 signals and 3 tracks + 3 hits)
576 pList[globalIndex] = new Float_t [9];
580 *(pList[globalIndex]) = -3.;
581 *(pList[globalIndex]+1) = -3.;
582 *(pList[globalIndex]+2) = -3.;
583 *(pList[globalIndex]+3) = 0.;
584 *(pList[globalIndex]+4) = 0.;
585 *(pList[globalIndex]+5) = 0.;
586 *(pList[globalIndex]+6) = -1.;
587 *(pList[globalIndex]+7) = -1.;
588 *(pList[globalIndex]+8) = -1.;
590 *pList[globalIndex] = (float)label;
591 *(pList[globalIndex]+3) = signal;
592 *(pList[globalIndex]+6) = (float)idhit;
597 // check the signal magnitude
598 highest = *(pList[globalIndex]+3);
599 middle = *(pList[globalIndex]+4);
600 lowest = *(pList[globalIndex]+5);
603 signal -= (highest+middle+lowest);
607 // compare the new signal with already existing list
609 if(signal<lowest) return; // neglect this track
613 *(pList[globalIndex]+8) = *(pList[globalIndex]+7);
614 *(pList[globalIndex]+7) = *(pList[globalIndex]+6);
615 *(pList[globalIndex]+6) = idhit;
616 *(pList[globalIndex]+5) = middle;
617 *(pList[globalIndex]+4) = highest;
618 *(pList[globalIndex]+3) = signal;
619 *(pList[globalIndex]+2) = *(pList[globalIndex]+1);
620 *(pList[globalIndex]+1) = *pList[globalIndex];
621 *(pList[globalIndex]) = label;
623 else if (signal>middle)
625 *(pList[globalIndex]+8) = *(pList[globalIndex]+7);
626 *(pList[globalIndex]+7) = idhit;
627 *(pList[globalIndex]+5) = middle;
628 *(pList[globalIndex]+4) = signal;
629 *(pList[globalIndex]+2) = *(pList[globalIndex]+1);
630 *(pList[globalIndex]+1) = label;
634 *(pList[globalIndex]+8) = idhit;
635 *(pList[globalIndex]+5) = signal;
636 *(pList[globalIndex]+2) = label;
640 //_________________________________________________________________________
641 void AliITSsimulationSPDbari::SetFluctuations(Float_t **pList) {
643 // Set the electronic noise and threshold non-uniformities to all the
644 // pixels in a detector.
645 // The parameter fSigma is the squared sum of the sigma due to noise
646 // and the sigma of the threshold distribution among pixels.
650 <img src="picts/ITS/barimodel_1.gif">
653 <font size=+2 color=red>
654 <a href="mailto:Rocco.Caliandro@ba.infn.it"></a>.
665 for(iz=1;iz<=fNPixelsZ;iz++){
666 for(ix=1;ix<=fNPixelsX;ix++){
667 signal = fSigma*random.Gaus();
668 fMapA2->SetHit(iz,ix,signal);
670 // insert in the label-signal-hit list the pixels fired only by noise
671 if ( signal > fThresh) {
672 Int_t globalIndex = iz*fNPixelsX+ix;
673 pList[globalIndex] = new Float_t [9];
674 *(pList[globalIndex]) = -2.;
675 *(pList[globalIndex]+1) = -2.;
676 *(pList[globalIndex]+2) = -2.;
677 *(pList[globalIndex]+3) = signal;
678 *(pList[globalIndex]+4) = 0.;
679 *(pList[globalIndex]+5) = 0.;
680 *(pList[globalIndex]+6) = -1.;
681 *(pList[globalIndex]+7) = -1.;
682 *(pList[globalIndex]+8) = -1.;
684 } // end of loop on pixels
685 } // end of loop on pixels
688 //____________________________________________
690 void AliITSsimulationSPDbari::CreateHistograms() {
694 for(i=0;i<fNPixelsZ;i++) {
695 TString spdname("spd_");
697 sprintf(candnum,"%d",i+1);
698 spdname.Append(candnum);
699 (*fHis)[i] = new TH1F(spdname.Data(),"SPD maps",
700 fNPixelsX,0.,(Float_t) fNPixelsX);
705 //____________________________________________
707 void AliITSsimulationSPDbari::ResetHistograms() {
709 // Reset histograms for this detector
712 for(i=0;i<fNPixelsZ;i++ ) {
713 if ((*fHis)[i]) ((TH1F*)(*fHis)[i])->Reset();