1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
19 #include <Riostream.h>
22 #include <TParticle.h>
26 #include "AliITSMapA2.h"
27 #include "AliITSdigitSPD.h"
28 #include "AliITSgeom.h"
29 #include "AliITShit.h"
30 #include "AliITSmodule.h"
31 #include "AliITSpList.h"
32 #include "AliITSresponseSPD.h"
33 #include "AliITSsegmentationSPD.h"
34 #include "AliITSsimulationSPDdubna.h"
40 ClassImp(AliITSsimulationSPDdubna)
41 ////////////////////////////////////////////////////////////////////////
43 // Modified by Bjorn S. Nilsen
45 // Written by Boris Batyunya
48 // AliITSsimulationSPDdubna is to do the simulation of SPDs.
49 //______________________________________________________________________
50 AliITSsimulationSPDdubna::AliITSsimulationSPDdubna():
55 // Default constructor.
61 // A default constructed AliITSsimulationSPDdubna class.
63 AliDebug(1,Form("Calling degault constructor"));
65 //______________________________________________________________________
66 AliITSsimulationSPDdubna::AliITSsimulationSPDdubna(AliITSDetTypeSim *dettyp, Int_t cup):
67 AliITSsimulation(dettyp),
71 // standard constructor
73 // AliITSsegmentation *seg A pointer to the segmentation class
74 // to be used for this simulation
75 // AliITSresponse *resp A pointer to the responce class to
76 // be used for this simulation
77 // Int_t cup The type of coupling to be used
78 // =1 uses SetCoupling, =2 uses SetCouplingOld
79 // With diffusion tured off
80 // =3 uses SetCoupling, =4 uses SetCouplingOld
81 // with diffusion on other, no coupling.
85 // A default constructed AliITSsimulationSPDdubna class.
88 Form("Calling degault constructor cup=%d",cup));
89 if(cup==1||cup==2){ // For the moment, remove defusion if Coupling is
91 AliITSresponseSPD* res = (AliITSresponseSPD*)GetResponseModel(fDetType->GetITSgeom()->GetStartSPD());
92 res->SetTemperature(0.0);
93 res->SetDistanceOverVoltage(0.0);
97 //______________________________________________________________________
98 void AliITSsimulationSPDdubna::Init(){
106 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
110 SetMap(new AliITSpList(GetNPixelsZ(),GetNPixelsX()));
111 AliITSresponseSPD* res = (AliITSresponseSPD*)GetResponseModel(fDetType->GetITSgeom()->GetStartSPD());
112 AliITSsegmentationSPD* seg = (AliITSsegmentationSPD*)GetSegmentationModel(0);
113 res->SetDistanceOverVoltage(kmictocm*seg->Dy(),50.0);
115 //______________________________________________________________________
116 AliITSsimulationSPDdubna::~AliITSsimulationSPDdubna(){
130 //______________________________________________________________________
131 AliITSsimulationSPDdubna::AliITSsimulationSPDdubna(const
132 AliITSsimulationSPDdubna
133 &s) : AliITSsimulation(s){
136 // AliITSsimulationSPDdubna &s The original class for which
137 // this class is a copy of
145 //______________________________________________________________________
146 AliITSsimulationSPDdubna& AliITSsimulationSPDdubna::operator=(const
147 AliITSsimulationSPDdubna &s){
148 // Assignment operator
150 // AliITSsimulationSPDdubna &s The original class for which
151 // this class is a copy of
156 if(&s == this) return *this;
158 fCoupling = s.fCoupling;
159 fSPDname = s.fSPDname;
162 //______________________________________________________________________
163 AliITSsimulation& AliITSsimulationSPDdubna::operator=(const
164 AliITSsimulation &s){
165 // Assignment operator
167 // AliITSsimulationSPDdubna &s The original class for which
168 // this class is a copy of
173 if(&s == this) return *this;
174 Error("AliITSsimulationSPDdubna","Not allowed to make a = with "
175 "AliITSsimulationSPDdubna","Using default creater instead");
179 //______________________________________________________________________
180 void AliITSsimulationSPDdubna::InitSimulationModule(Int_t module, Int_t event){
181 // This function creates maps to build the list of tracks for each
182 // summable digit. Inputs defined by base class.
184 // Int_t module // Module number to be simulated
185 // Int_t event // Event number to be simulated
191 AliDebug(1,Form("(module=%d,event=%d)",module,event));
192 SetModuleNumber(module);
193 SetEventNumber(event);
196 //_____________________________________________________________________
197 void AliITSsimulationSPDdubna::SDigitiseModule(AliITSmodule *mod,Int_t,
199 // This function begins the work of creating S-Digits. Inputs defined
202 // AliITSmodule *mod // module
204 // Int_t event // Event number
208 // test // test returns kTRUE if the module contained hits
209 // // test returns kFALSE if it did not contain hits
211 AliDebug(1,Form("(mod=%p, ,event=%d)",mod,event));
212 if(!(mod->GetNhits())){
213 AliDebug(1,Form("In event %d module %d there are %d hits returning.",
214 event, mod->GetIndex(),mod->GetNhits()));
215 return;// if module has no hits don't create Sdigits
217 SetModuleNumber(mod->GetIndex());
218 SetEventNumber(event);
223 //______________________________________________________________________
224 void AliITSsimulationSPDdubna::WriteSDigits(){
225 // This function adds each S-Digit to pList
232 Int_t ix, nix, iz, niz;
233 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
235 AliDebug(1,Form("Writing SDigits for module %d",GetModuleNumber()));
236 GetMap()->GetMaxMapIndex(niz, nix);
237 for(iz=0; iz<niz; iz++)for(ix=0; ix<nix; ix++){
238 if(GetMap()->GetSignalOnly(iz,ix)>0.0){
239 aliITS->AddSumDigit(*(GetMap()->GetpListItem(iz,ix)));
240 if(AliDebugLevel()>0) {
241 AliDebug(1,Form("%d, %d",iz,ix));
242 cout << *(GetMap()->GetpListItem(iz,ix)) << endl;
244 } // end if GetMap()->GetSignalOnly(iz,ix)>0.0
248 //______________________________________________________________________
249 void AliITSsimulationSPDdubna::FinishSDigitiseModule(){
250 // This function calls SDigitsToDigits which creates Digits from SDigits
259 pListToDigits(); // Charge To Signal both adds noise and
263 //______________________________________________________________________
264 void AliITSsimulationSPDdubna::DigitiseModule(AliITSmodule *mod,Int_t,
266 // This function creates Digits straight from the hits and then adds
267 // electronic noise to the digits before adding them to pList
268 // Each of the input variables is passed along to HitToSDigit
270 // AliITSmodule *mod module
278 AliDebug(1,Form("(mod=%p,,)",mod));
283 //______________________________________________________________________
284 void AliITSsimulationSPDdubna::HitToSDigit(AliITSmodule *mod){
285 // Does the charge distributions using Gaussian diffusion charge charing.
287 // AliITSmodule *mod Pointer to this module
292 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
293 TObjArray *hits = mod->GetHits();
294 Int_t nhits = hits->GetEntriesFast();
297 Double_t x0=0.0,x1=0.0,y0=0.0,y1=0.0,z0=0.0,z1=0.0,de=0.0;
298 Double_t x,y,z,t,tp,st,dt=0.2,el,sig;
299 AliITSsegmentationSPD* seg = (AliITSsegmentationSPD*)GetSegmentationModel(0);
300 AliITSresponseSPD* res = (AliITSresponseSPD*)GetResponseModel(fDetType->GetITSgeom()->GetStartSPD());
301 Double_t thick = kmictocm*seg->Dy();
303 AliDebug(1,Form("(mod=%p) fCoupling=%d",mod,fCoupling));
305 for(h=0;h<nhits;h++){
306 if(AliDebugLevel()>0) {
307 AliDebug(1,Form("Hits, %d", h));
308 cout << *(mod->GetHit(h)) << endl;
310 if(!mod->LineSegmentL(h,x0,x1,y0,y1,z0,z1,de,idtrack)) continue;
311 st = TMath::Sqrt(x1*x1+y1*y1+z1*z1);
313 st = (Double_t)((Int_t)(st/kmictocm)); // number of microns
314 if(st<=1.0) st = 1.0;
316 for(t=0.0;t<1.0;t+=dt){ // Integrate over t
321 if(!(seg->LocalToDet(x,z,ix,iz))) continue; // outside
322 el = res->GeVToCharge((Double_t)(dt*de));
324 if(el<=0.0) cout<<"el="<<el<<" dt="<<dt
327 sig = res->SigmaDiffusion1D(thick + y);
328 SpreadCharge(x,z,ix,iz,el,sig,idtrack,h);
330 } else { // st == 0.0 deposit it at this point
334 if(!(seg->LocalToDet(x,z,ix,iz))) continue; // outside
335 el = res->GeVToCharge((Double_t)de);
336 sig = res->SigmaDiffusion1D(thick + y);
337 SpreadCharge(x,z,ix,iz,el,sig,idtrack,h);
344 // x is column and z is row (see AliITSsegmentationSPD::GetPadIxz)
345 for(i=0;i<GetMap()->GetEntries();i++)
346 if(GetMap()->GetpListItem(i)==0) continue;
348 GetMap()->GetMapIndex(
349 GetMap()->GetpListItem(i)->GetIndex(),iz,ix);
350 SetCoupling(iz,ix,idtrack,h);
354 // x is column and z is row (see AliITSsegmentationSPD::GetPadIxz)
355 for(i=0;i<GetMap()->GetEntries();i++)
356 if(GetMap()->GetpListItem(i)==0) continue;
358 GetMap()->GetMapIndex(
359 GetMap()->GetpListItem(i)->GetIndex(),iz,ix);
360 SetCouplingOld(iz,ix,idtrack,h);
364 } // Loop over all hits h
365 if(GetDebug(2))Info("HitToSDigit","Finished fCoupling=%d",fCoupling);
367 //______________________________________________________________________
368 void AliITSsimulationSPDdubna::SpreadCharge(Double_t x0,Double_t z0,
370 Double_t el,Double_t sig,Int_t t,
372 // Spreads the charge over neighboring cells. Assume charge is distributed
373 // as charge(x,z) = (el/2*pi*sig*sig)*exp(-arg)
374 // arg=((x-x0)*(x-x0)/2*sig*sig)+((z-z0*z-z0)/2*sig*sig)
375 // Defined this way, the integral over all x and z is el.
377 // Double_t x0 x position of point where charge is liberated
378 // Double_t y0 y position of point where charge is liberated
379 // Double_t z0 z position of point where charge is liberated
380 // Int_t ix0 row of cell corresponding to point x0
381 // Int_t iz0 columb of cell corresponding to point z0
382 // Double_t el number of electrons liberated in this step
383 // Double_t sig Sigma difusion for this step (y0 dependent)
384 // Int_t t track number
385 // Int_t ti hit track index number
386 // Int_t hi hit "hit" index number
391 const Int_t knx = 3,knz = 2;
392 const Double_t kRoot2 = 1.414213562; // Sqrt(2).
393 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
394 Int_t ix,iz,ixs,ixe,izs,ize;
396 Double_t x1,x2,z1,z2,s,sp;
397 AliITSsegmentationSPD* seg = (AliITSsegmentationSPD*)GetSegmentationModel(0);
400 if(GetDebug(4)) Info("SpreadCharge","(x0=%e,z0=%e,ix0=%d,iz0=%d,el=%e,"
401 "sig=%e,t=%d,i=%d)",x0,z0,ix0,iz0,el,sig,t,hi);
402 if(sig<=0.0) { // if sig<=0 No diffusion to simulate.
403 GetMap()->AddSignal(iz0,ix0,t,hi,GetModuleNumber(),el);
405 cout << "sig<=0.0=" << sig << endl;
409 sp = 1.0/(sig*kRoot2);
411 cout << "sig=" << sig << " sp=" << sp << endl;
413 ixs = TMath::Max(-knx+ix0,0);
414 ixe = TMath::Min(knx+ix0,seg->Npx()-1);
415 izs = TMath::Max(-knz+iz0,0);
416 ize = TMath::Min(knz+iz0,seg->Npz()-1);
417 for(ix=ixs;ix<=ixe;ix++) for(iz=izs;iz<=ize;iz++){
418 seg->DetToLocal(ix,iz,x,z); // pixel center
421 x2 = x1 + 0.5*kmictocm*seg->Dpx(ix); // Upper
422 x1 -= 0.5*kmictocm*seg->Dpx(ix); // Lower
423 z2 = z1 + 0.5*kmictocm*seg->Dpz(iz); // Upper
424 z1 -= 0.5*kmictocm*seg->Dpz(iz); // Lower
425 x1 -= x0; // Distance from where track traveled
426 x2 -= x0; // Distance from where track traveled
427 z1 -= z0; // Distance from where track traveled
428 z2 -= z0; // Distance from where track traveled
429 s = 0.25; // Correction based on definision of Erfc
430 s *= TMath::Erfc(sp*x1) - TMath::Erfc(sp*x2);
432 cout <<"el="<<el<<" ix0="<<ix0<<" ix="<<ix<<" x0="<<x<<
433 " iz0="<<iz0<<" iz="<<iz<<" z0="<<z<<
434 " sp*x1="<<sp*x1<<" sp*x2="<<sp*x2<<" s="<<s;
436 s *= TMath::Erfc(sp*z1) - TMath::Erfc(sp*z2);
438 cout<<" sp*z1="<<sp*z1<<" sp*z2="<<sp*z2<<" s="<<s<< endl;
440 GetMap()->AddSignal(iz,ix,t,hi,GetModuleNumber(),s*el);
443 //______________________________________________________________________
444 void AliITSsimulationSPDdubna::pListToDigits(){
445 // add noise and electronics, perform the zero suppression and add the
453 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
455 Double_t electronics;
457 const Int_t nmaxtrk=AliITSdigitSPD::GetNTracks();
458 static AliITSdigitSPD dig;
459 AliITSresponseSPD* res = (AliITSresponseSPD*)GetResponseModel(fDetType->GetITSgeom()->GetStartSPD());
460 if(GetDebug(1)) Info("pListToDigits","()");
461 for(iz=0; iz<GetNPixelsZ(); iz++) for(ix=0; ix<GetNPixelsX(); ix++){
462 // Apply Noise/Dead channals and the like
463 if(res->IsPixelDead(GetModuleNumber(),ix,iz)) continue;
464 electronics = res->ApplyBaselineAndNoise();
465 UpdateMapNoise(ix,iz,electronics);
467 // Apply Threshold and write Digits.
468 sig = GetMap()->GetSignalOnly(iz,ix);
469 FillHistograms(ix,iz,sig+electronics);
471 cout<<sig<<"+"<<electronics<<">threshold("<<ix<<","<<iz
472 <<")="<<GetThreshold(ix,iz) <<endl;
474 if (sig+electronics <= GetThreshold(ix,iz)) continue;
478 dig.SetSignalSPD((Int_t) GetMap()->GetSignal(iz,ix));
479 for(j=0;j<nmaxtrk;j++){
480 if (j<GetMap()->GetNEnteries()) {
481 dig.SetTrack(j,GetMap()->GetTrack(iz,ix,j));
482 dig.SetHit(j,GetMap()->GetHit(iz,ix,j));
483 }else { // Default values
489 cout<<iz<<","<<ix<<","<<*(GetMap()->GetpListItem(iz,ix))<<endl;
491 aliITS->AddSimDigit(0,&dig);
494 //______________________________________________________________________
495 void AliITSsimulationSPDdubna::CreateHistograms(){
496 // create 1D histograms for tests
504 if(GetDebug(1)) Info("CreateHistograms","create histograms");
506 fHis = new TObjArray(GetNPixelsZ());
507 TString fSPDname("spd_");
508 for(Int_t i=0;i<GetNPixelsZ();i++) {
510 sprintf(pixelz,"%d",i);
511 fSPDname.Append(pixelz);
512 fHis->AddAt(new TH1F(fSPDname.Data(),"SPD maps",
513 GetNPixelsX(),0.,(Double_t)GetNPixelsX()),i);
516 //______________________________________________________________________
517 void AliITSsimulationSPDdubna::FillHistograms(Int_t ix,Int_t iz,Double_t v){
518 // Fill the histogram
526 if(!GetHistArray()) return; // Only fill if setup.
527 if(GetDebug(2)) Info("FillHistograms","fill histograms");
528 GetHistogram(iz)->Fill(ix,v);
530 //______________________________________________________________________
531 void AliITSsimulationSPDdubna::ResetHistograms(){
532 // Reset histograms for this detector
540 if(!GetHistArray()) return; // Only fill if setup.
541 if(GetDebug(2)) Info("FillHistograms","fill histograms");
542 for ( int i=0;i<GetNPixelsZ();i++ ) {
543 if (fHis->At(i)) ((TH1F*)fHis->At(i))->Reset();
547 //______________________________________________________________________
548 void AliITSsimulationSPDdubna::SetCoupling(Int_t row, Int_t col, Int_t ntrack,
550 // Take into account the coupling between adiacent pixels.
551 // The parameters probcol and probrow are the probability of the
552 // signal in one pixel shared in the two adjacent pixels along
553 // the column and row direction, respectively.
554 // Note pList is goten via GetMap() and module is not need any more.
555 // Otherwise it is identical to that coded by Tiziano Virgili (BSN).
558 <img src="picts/ITS/barimodel_3.gif">
561 <font size=+2 color=red>
562 <a href="mailto:tiziano.virgili@cern.ch"></a>.
568 // Int_t row z cell index
569 // Int_t col x cell index
570 // Int_t ntrack track incex number
571 // Int_t idhit hit index number
577 Double_t pulse1,pulse2;
578 Double_t couplR=0.0,couplC=0.0;
581 GetCouplings(couplR,couplC);
582 if(GetDebug(3)) Info("SetCoupling","(row=%d,col=%d,ntrack=%d,idhit=%d) "
583 "Calling SetCoupling couplR=%e couplC=%e",
584 row,col,ntrack,idhit,couplR,couplC);
587 pulse1 = GetMap()->GetSignalOnly(row,col);
589 for (Int_t isign=-1;isign<=1;isign+=2){// loop in row direction
593 xr = gRandom->Rndm();
594 //if ((j1<0)||(j1>GetNPixelsZ()-1)||(pulse1<GetThreshold(j1,col))){
595 if ((j1<0) || (j1>GetNPixelsZ()-1) || (xr>couplR)){
599 UpdateMapSignal(col,j1,ntrack,idhit,pulse1);
601 flag = 1; // only first next!!
604 // loop in column direction
608 xr = gRandom->Rndm();
609 //if((j2<0)||j2>(GetNPixelsX()-1)||pulse2<GetThreshold(row,j2)){
610 if ((j2<0) || (j2>GetNPixelsX()-1) || (xr>couplC)){
614 UpdateMapSignal(j2,row,ntrack,idhit,pulse2);
616 flag = 1; // only first next!!
621 //______________________________________________________________________
622 void AliITSsimulationSPDdubna::SetCouplingOld(Int_t row, Int_t col,
623 Int_t ntrack,Int_t idhit) {
624 // Take into account the coupling between adiacent pixels.
625 // The parameters probcol and probrow are the fractions of the
626 // signal in one pixel shared in the two adjacent pixels along
627 // the column and row direction, respectively.
630 <img src="picts/ITS/barimodel_3.gif">
633 <font size=+2 color=red>
634 <a href="mailto:Rocco.Caliandro@ba.infn.it"></a>.
640 // Int_t row z cell index
641 // Int_t col x cell index
642 // Int_t ntrack track incex number
643 // Int_t idhit hit index number
644 // Int_t module module number
650 Double_t pulse1,pulse2;
651 Double_t couplR=0.0,couplC=0.0;
653 GetCouplings(couplR,couplC);
654 if(GetDebug(3)) Info("SetCouplingOld","(row=%d,col=%d,ntrack=%d,idhit=%d) "
655 "Calling SetCoupling couplR=%e couplC=%e",
656 row,col,ntrack,idhit,couplR,couplC);
659 pulse1 = GetMap()->GetSignalOnly(row,col);
661 for (Int_t isign=-1;isign<=1;isign+=2){// loop in row direction
665 if ((j1<0)||(j1>GetNPixelsZ()-1)||(pulse1<GetThreshold(j1,col))){
666 pulse1 = GetMap()->GetSignalOnly(row,col);
670 UpdateMapSignal(col,j1,ntrack,idhit,pulse1);
674 // loop in column direction
678 if((j2<0)||(j2>(GetNPixelsX()-1))||(pulse2<GetThreshold(row,j2))){
679 pulse2 = GetMap()->GetSignalOnly(row,col);
683 UpdateMapSignal(j2,row,ntrack,idhit,pulse2);