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f74211b0 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/*
17$Log$
b9d0a01d 18Revision 1.3.8.2 2002/10/14 13:14:08 hristov
19Updating VirtualMC to v3-09-02
20
21Revision 1.7 2002/09/09 17:23:28 nilsen
22Minor changes in support of changes to AliITSdigitS?D class'.
23
ee86d557 24Revision 1.6 2002/08/21 22:09:58 nilsen
25Updated SPD simulation with difusion effects. ReWritten Hit to SDigits
26code.
27
f74211b0 28*/
409f8c84 29#include <iostream.h>
30#include <TRandom.h>
31#include <TH1.h>
32#include <TMath.h>
33#include <TString.h>
34#include <TParticle.h>
35
409f8c84 36#include "AliRun.h"
37#include "AliITS.h"
38#include "AliITShit.h"
39#include "AliITSdigit.h"
40#include "AliITSmodule.h"
41#include "AliITSMapA2.h"
2cc6b29a 42#include "AliITSpList.h"
409f8c84 43#include "AliITSsimulationSPDdubna.h"
f74211b0 44#include "AliITSsegmentationSPD.h"
45#include "AliITSresponseSPDdubna.h"
409f8c84 46
f74211b0 47//#define DEBUG
409f8c84 48
49ClassImp(AliITSsimulationSPDdubna)
50////////////////////////////////////////////////////////////////////////
51// Version: 0
52// Written by Boris Batyunya
53// December 20 1999
54//
55// AliITSsimulationSPDdubna is the simulation of SPDs
2cc6b29a 56//______________________________________________________________________
57
58
59AliITSsimulationSPDdubna::AliITSsimulationSPDdubna(){
60 // constructor
61
62 fResponse = 0;
63 fSegmentation = 0;
64 fMapA2 = 0;
65 fpList = 0;
66 fModule = 0;
67 fEvent = 0;
68 fHis = 0;
69 fNoise = 0.;
70 fBaseline = 0.;
71 fNPixelsZ = 0;
72 fNPixelsX = 0;
409f8c84 73}
2cc6b29a 74//______________________________________________________________________
75AliITSsimulationSPDdubna::AliITSsimulationSPDdubna(AliITSsegmentation *seg,
76 AliITSresponse *resp){
77 // standard constructor
f74211b0 78 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
409f8c84 79
2cc6b29a 80 fHis = 0;
81 fResponse = resp;
82 fSegmentation = seg;
83 fModule = 0;
84 fEvent = 0;
409f8c84 85
2cc6b29a 86 fNPixelsZ=fSegmentation->Npz();
87 fNPixelsX=fSegmentation->Npx();
409f8c84 88
2cc6b29a 89 fResponse->GetNoiseParam(fNoise,fBaseline);
f74211b0 90 fResponse->SetDistanceOverVoltage(kmictocm*fSegmentation->Dy(),50.0);
409f8c84 91
f74211b0 92// fMapA2 = new AliITSMapA2(fSegmentation);
93 fMapA2 = 0;
409f8c84 94
2cc6b29a 95 fpList = new AliITSpList(fNPixelsZ+1,fNPixelsX+1);
409f8c84 96
2cc6b29a 97}
98//______________________________________________________________________
99AliITSsimulationSPDdubna::~AliITSsimulationSPDdubna(){
100 // destructor
409f8c84 101
f74211b0 102 if(fMapA2) delete fMapA2;
409f8c84 103
2cc6b29a 104 if (fHis) {
105 fHis->Delete();
106 delete fHis;
107 } // end if fHis
409f8c84 108}
2cc6b29a 109//______________________________________________________________________
110AliITSsimulationSPDdubna::AliITSsimulationSPDdubna(const
111 AliITSsimulationSPDdubna
112 &source){
113 // Copy Constructor
114 if(&source == this) return;
115 this->fMapA2 = source.fMapA2;
116 this->fNoise = source.fNoise;
117 this->fBaseline = source.fBaseline;
118 this->fNPixelsX = source.fNPixelsX;
119 this->fNPixelsZ = source.fNPixelsZ;
120 this->fHis = source.fHis;
121 return;
122}
123//______________________________________________________________________
124AliITSsimulationSPDdubna& AliITSsimulationSPDdubna::operator=(const
125 AliITSsimulationSPDdubna &source){
126 // Assignment operator
127 if(&source == this) return *this;
128 this->fMapA2 = source.fMapA2;
129 this->fNoise = source.fNoise;
130 this->fBaseline = source.fBaseline;
131 this->fNPixelsX = source.fNPixelsX;
132 this->fNPixelsZ = source.fNPixelsZ;
133 this->fHis = source.fHis;
134 return *this;
135}
136//______________________________________________________________________
137void AliITSsimulationSPDdubna::InitSimulationModule(Int_t module, Int_t event){
138 // This function creates maps to build the list of tracks for each
139 // summable digit.
140 //
141 // Inputs:
142 // Int_t module // Module number to be simulated
143 // Int_t event // Event number to be simulated
144 //
145 // Outputs:
146 // none
147 //
148 // Returns:
149 // none
409f8c84 150
2cc6b29a 151 fModule = module;
152 fEvent = event;
f74211b0 153// fMapA2->ClearMap();
2cc6b29a 154 fpList->ClearMap();
155}
156//_____________________________________________________________________
157void AliITSsimulationSPDdubna::SDigitiseModule(AliITSmodule *mod, Int_t mask,
158 Int_t event){
159 // This function begins the work of creating S-Digits
160 //
161 // Inputs:
162 // AliITSmodule *mod // module
163 // Int_t mask // mask to be applied to the module
164 //
165 // Outputs:
166 // none
167 //
168 // Return:
169 // test // test returns kTRUE if the module contained hits
170 // // test returns kFALSE if it did not contain hits
409f8c84 171
2cc6b29a 172 Int_t module = 0;
409f8c84 173
2cc6b29a 174 if(!(mod->GetNhits())) return;// if module has no hits don't create Sdigits
175 fModule = mod->GetIndex();
176 HitToSDigit(mod, module, mask, fpList);
177 WriteSDigits(fpList);
f74211b0 178// fMapA2->ClearMap();
2cc6b29a 179 fpList->ClearMap();
409f8c84 180}
2cc6b29a 181//______________________________________________________________________
182void AliITSsimulationSPDdubna::WriteSDigits(AliITSpList *pList){
183 // This function adds each S-Digit to pList
184 //
185 // Inputs:
186 // AliITSpList *pList
187 //
188 // Outputs:
189 // none
190 //
191 // Return:
192 // none
7d50ea21 193 Int_t ix, nix, iz, niz;
2cc6b29a 194 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
195
7d50ea21 196 pList->GetMaxMapIndex(niz, nix);
197 for(iz=0; iz<niz; iz++)for(ix=0; ix<nix; ix++){
198 if(pList->GetSignalOnly(iz,ix)>0.0){
199 aliITS->AddSumDigit(*(pList->GetpListItem(iz,ix)));
f74211b0 200#ifdef DEBUG
201 cout <<"SDigits " << iz << "," << ix << "," <<
202 *(pList->GetpListItem(iz,ix)) << endl;
203#endif
2cc6b29a 204 } // end if pList
7d50ea21 205 } // end for iz,ix
2cc6b29a 206 return;
207}
208//______________________________________________________________________
209void AliITSsimulationSPDdubna::FinishSDigitiseModule(){
210 // This function calls SDigitsToDigits which creates Digits from SDigits
211 //
212 // Inputs:
213 // none
214 //
215 // Outputs:
216 // none
217 // Return
218 // none
409f8c84 219
2cc6b29a 220 SDigitsToDigits(fModule, fpList);
221 return;
222}
223//______________________________________________________________________
224void AliITSsimulationSPDdubna::SDigitsToDigits(Int_t module,
225 AliITSpList *pList){
226 // This function adds electronic noise to the S-Digits and then adds them
227 // to a new pList
228 //
229 // Inputs:
230 // Int_t module // module number
231 // AliITSpList *pList // pList
232 //
233 // Outputs:
234 // pList is passed along to the functions ChargeToSignal and GetList
235 //
236 // Return:
237 // none
409f8c84 238
2cc6b29a 239 fModule = module;
240 ChargeToSignal(pList); // Charge To Signal both adds noise and
f74211b0 241// fMapA2->ClearMap();
2cc6b29a 242 pList->ClearMap();
409f8c84 243}
2cc6b29a 244//______________________________________________________________________
245void AliITSsimulationSPDdubna::DigitiseModule(AliITSmodule *mod, Int_t module,
246 Int_t dummy){
247 // This function creates Digits straight from the hits and then adds
248 // electronic noise to the digits before adding them to pList
249 //
250 // Inputs:
251 // AliITSmodule *mod // module
252 // Int_t module // module number Dummy.
253 // Int_t dummy
254 //
255 // Outputs:
256 // Each of the input variables is passed along to HitToSDigit
257 //
258 // Return:
259 // none
409f8c84 260
2cc6b29a 261 fModule = mod->GetIndex(); //This calls the module for HitToSDigit
262 HitToSDigit(mod,fModule, dummy, fpList);
263 ChargeToSignal(fpList);
f74211b0 264// fMapA2->ClearMap();
2cc6b29a 265 fpList->ClearMap();
266}
267//______________________________________________________________________
7d50ea21 268void AliITSsimulationSPDdubna::UpdateMapSignal(Int_t iz, Int_t ix, Int_t trk,
2cc6b29a 269 Int_t ht, Int_t module,
270 Double_t signal,
271 AliITSpList *pList){
272 // This function adds a signal to the pList from the pList class
273 //
274 // Inputs:
7d50ea21 275 // Int_t iz // row number
276 // Int_t ix // column number
2cc6b29a 277 // Int_t trk // track number
278 // Int_t ht // hit number
279 // Double_t signal // signal strength
280 // AliITSpList *pList // pList
281 //
282 // Outputs:
283 // All of the inputs are passed to AliITSpList::AddSignal
284 // Int_t ix // row number
285 // Int_t iz // column number
286 // Double_t sig // signal strength
287 // // These three variables are defined to preserve the
288 // // assignments used in the function AliITSMapA2::AddSignal
289 //
290 // Return:
291 // none
2cc6b29a 292
f74211b0 293// fMapA2->AddSignal(iz, ix, signal);
7d50ea21 294 pList->AddSignal(iz,ix, trk, ht, fModule, signal);
2cc6b29a 295}
296//______________________________________________________________________
7d50ea21 297void AliITSsimulationSPDdubna::UpdateMapNoise(Int_t iz,
298 Int_t ix, Int_t fModule,
2cc6b29a 299 Double_t sig, Float_t noise,
300 AliITSpList *pList){
301 // This function adds noise to data in the MapA2 as well as the pList
302 //
303 // Inputs:
7d50ea21 304 // Int_t iz // row number
305 // Int_t ix // column number
2cc6b29a 306 // Int_t mod // module number
307 // Double_t sig // signal strength
308 // Double_t noise // electronic noise generated by ChargeToSignal
309 // AliITSpList *pList // pList
310 //
311 // Outputs:
312 // All of the inputs are passed to AliITSMapA2::AddSignal or
313 // AliITSpList::AddNoise
314 //
315 // Return:
316 // none
409f8c84 317
f74211b0 318// fMapA2->AddSignal(iz, ix, noise);
7d50ea21 319 pList->AddNoise(iz,ix, fModule, noise);
2cc6b29a 320}
321//______________________________________________________________________
322void AliITSsimulationSPDdubna::HitToDigit(AliITSmodule *mod, Int_t module,
323 Int_t dummy){
324 DigitiseModule(mod, module, dummy);
325}
326//______________________________________________________________________
327void AliITSsimulationSPDdubna::HitToSDigit(AliITSmodule *mod, Int_t module,
f74211b0 328 Int_t dummy,AliITSpList *pList){
329 // Does the charge distributions using Gaussian diffusion charge charing.
330 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
331 TObjArray *hits = mod->GetHits();
332 Int_t nhits = hits->GetEntriesFast();
333 Int_t h,ix,iz;
334 Int_t idtrack;
335 Double_t x0=0.0,x1=0.0,y0=0.0,y1=0.0,z0=0.0,z1=0.0,de=0.0;
336 Double_t x,y,z,t,tp,st,dt=0.2,el,sig;
337 Double_t thick = kmictocm*GetSeg()->Dy();
338
339 if(nhits<=0) return;
340 for(h=0;h<nhits;h++){
341#ifdef DEBUG
342 cout << "Hits=" << h << "," << *(mod->GetHit(h)) << endl;
343#endif
344 if(mod->LineSegmentL(h,x0,x1,y0,y1,z0,z1,de,idtrack)){
345 st =TMath::Sqrt(x1*x1+y1*y1+z1*z1);
346 if(st>0.0) for(t=0;t<1.0;t+=dt){ // Integrate over t
347 tp = t+0.5*dt;
348 el = GetResp()->GeVToCharge((Float_t)(dt*de));
349#ifdef DEBUG
350 if(el<=0.0) cout << "el="<<el<<" dt="<<dt<<" de="<<de<<endl;
351#endif
352 x = x0+x1*tp;
353 y = y0+y1*tp;
354 z = z0+z1*tp;
355 GetSeg()->LocalToDet(x,z,ix,iz);
356 sig = GetResp()->SigmaDiffusion1D(thick + y);
357 SpreadCharge(x,y,z,ix,iz,el,sig,
358 idtrack,mod->GetHitTrackIndex(h),h,mod->GetIndex());
359 } else { // st == 0.0 deposit it at this point
360 el = GetResp()->GeVToCharge((Float_t)de);
361 x = x0;
362 y = y0;
363 z = z0;
364 GetSeg()->LocalToDet(x,z,ix,iz);
365 sig = GetResp()->SigmaDiffusion1D(thick + y);
366 SpreadCharge(x,y,z,ix,iz,el,sig,
367 idtrack,mod->GetHitTrackIndex(h),h,mod->GetIndex());
368 } // end if st>0.0
369 }} // Loop over all hits h
370}
371//______________________________________________________________________
372void AliITSsimulationSPDdubna::SpreadCharge(Double_t x0,Double_t y0,
373 Double_t z0,Int_t ix0,Int_t iz0,
374 Double_t el,Double_t sig,Int_t t,
375 Int_t ti,Int_t hi,Int_t mod){
376 // Spreads the charge over neighboring cells. Assume charge is distributed
377 // as charge(x,z) = (el/2*pi*sig*sig)*exp(-arg)
378 // arg=((x-x0)*(x-x0)/2*sig*sig)+((z-z0*z-z0)/2*sig*sig)
379 // Defined this way, the integral over all x and z is el.
380 const Int_t knx = 3,knz = 2;
381 const Double_t kRoot2 = 1.414213562; // Sqrt(2).
382 const Double_t kmictocm = 1.0e-4; // convert microns to cm.
383 Int_t ix,iz,ixs,ixe,izs,ize;
384 Float_t x,z;
385 Double_t x1,x2,z1,z2,s,sp;
386
387 if(sig<=0.0) {
388 fpList->AddSignal(iz0,ix0,t,hi,mod,el);
389 return;
390 } // end if
391 sp = 1.0/(sig*kRoot2);
392#ifdef DEBUG
393 cout << "sig=" << sig << " sp=" << sp << endl;
394#endif
395 ixs = TMath::Max(-knx+ix0,0);
396 ixe = TMath::Min(knx+ix0,GetSeg()->Npx()-1);
397 izs = TMath::Max(-knz+iz0,0);
398 ize = TMath::Min(knz+iz0,GetSeg()->Npz()-1);
399 for(ix=ixs;ix<=ixe;ix++) for(iz=izs;iz<=ize;iz++){
400 GetSeg()->DetToLocal(ix,iz,x,z); // pixel center
401 x1 = x;
402 z1 = z;
403 x2 = x1 + 0.5*kmictocm*GetSeg()->Dpx(ix); // Upper
404 x1 -= 0.5*kmictocm*GetSeg()->Dpx(ix); // Lower
405 z2 = z1 + 0.5*kmictocm*GetSeg()->Dpz(iz); // Upper
406 z1 -= 0.5*kmictocm*GetSeg()->Dpz(iz); // Lower
407 x1 -= x0; // Distance from where track traveled
408 x2 -= x0; // Distance from where track traveled
409 z1 -= z0; // Distance from where track traveled
410 z2 -= z0; // Distance from where track traveled
411 s = 0.25; // Correction based on definision of Erfc
412 s *= TMath::Erfc(sp*x1) - TMath::Erfc(sp*x2);
413#ifdef DEBUG
414 cout << "el=" << el << " ix0=" << ix0 << " ix=" << ix << " x0="<< x <<
415 " iz0=" << iz0 << " iz=" << iz << " z0=" << z <<
416 " sp*x1=" << sp*x1 <<" sp*x2=" << sp*x2 << " s=" << s;
417#endif
418 s *= TMath::Erfc(sp*z1) - TMath::Erfc(sp*z2);
419#ifdef DEBUG
420 cout << " sp*z1=" << sp*z1 <<" sp*z2=" << sp*z2 << " s=" << s << endl;
421#endif
422 fpList->AddSignal(iz,ix,t,hi,mod,s*el);
423 } // end for ix, iz
424}
425//______________________________________________________________________
426void AliITSsimulationSPDdubna::HitToSDigitOld(AliITSmodule *mod, Int_t module,
2cc6b29a 427 Int_t dummy, AliITSpList *pList){
428 // digitize module
409f8c84 429 const Float_t kEnToEl = 2.778e+8; // GeV->charge in electrons
430 // for 3.6 eV/pair
431 const Float_t kconv = 10000.; // cm -> microns
432
433 Float_t spdLength = fSegmentation->Dz();
434 Float_t spdWidth = fSegmentation->Dx();
338e4f06 435 Float_t spdThickness = fSegmentation->Dy();
409f8c84 436 Float_t difCoef, dum;
437 fResponse->DiffCoeff(difCoef,dum);
338e4f06 438 if(spdThickness > 290) difCoef = 0.00613;
409f8c84 439
440 Float_t zPix0 = 1e+6;
441 Float_t xPix0 = 1e+6;
442 Float_t yPrev = 1e+6;
443
444 Float_t zPitch = fSegmentation->Dpz(0);
445 Float_t xPitch = fSegmentation->Dpx(0);
446
447 TObjArray *fHits = mod->GetHits();
2cc6b29a 448 module = mod->GetIndex();
409f8c84 449 Int_t nhits = fHits->GetEntriesFast();
450 if (!nhits) return;
f74211b0 451#ifdef DEBUG
2cc6b29a 452 cout<<"len,wid,thickness,nx,nz,pitchx,pitchz,difcoef ="<<spdLength<<","
453 <<spdWidth<<","<<spdThickness<<","<<fNPixelsX<<","<<fNPixelsZ<<","
454 <<xPitch<<","<<zPitch<<","<<difCoef<<endl;
f74211b0 455#endif
2cc6b29a 456 // Array of pointers to the label-signal list
409f8c84 457 Int_t indexRange[4] = {0,0,0,0};
458
459 // Fill detector maps with GEANT hits
460 // loop over hits in the module
461 static Bool_t first;
462 Int_t lasttrack=-2;
463 Int_t hit, iZi, jz, jx;
338e4f06 464 Int_t idhit=-1; //!
f74211b0 465#ifdef DEBUG
338e4f06 466 cout<<"SPDdubna: module,nhits ="<<module<<","<<nhits<<endl;
f74211b0 467#endif
409f8c84 468 for (hit=0;hit<nhits;hit++) {
469 AliITShit *iHit = (AliITShit*) fHits->At(hit);
f74211b0 470#ifdef DEBUG
471 cout << "Hits=" << hit << "," << *iHit << endl;
472#endif
338e4f06 473 //Int_t layer = iHit->GetLayer();
474 Float_t yPix0 = -spdThickness/2;
475
476 // work with the idtrack=entry number in the TreeH
477 //Int_t idhit,idtrack; //!
478 //mod->GetHitTrackAndHitIndex(hit,idtrack,idhit); //!
479 //Int_t idtrack=mod->GetHitTrackIndex(hit);
480 // or store straight away the particle position in the array
481 // of particles :
409f8c84 482 if(iHit->StatusEntering()) idhit=hit;
483 Int_t itrack = iHit->GetTrack();
484 Int_t dray = 0;
485
486 if (lasttrack != itrack || hit==(nhits-1)) first = kTRUE;
487
338e4f06 488 //Int_t parent = iHit->GetParticle()->GetFirstMother();
409f8c84 489 Int_t partcode = iHit->GetParticle()->GetPdgCode();
490
2cc6b29a 491 // partcode (pdgCode): 11 - e-, 13 - mu-, 22 - gamma, 111 - pi0,
492 // 211 - pi+, 310 - K0s, 321 - K+, 2112 - n, 2212 - p, 3122 - lambda
409f8c84 493
494 Float_t pmod = iHit->GetParticle()->P(); // total momentum at the
495 // vertex
496 pmod *= 1000;
497
409f8c84 498 if(partcode == 11 && pmod < 6) dray = 1; // delta ray is e-
499 // at p < 6 MeV/c
500
409f8c84 501 // Get hit z and x(r*phi) cordinates for each module (detector)
502 // in local system.
503
504 Float_t zPix = kconv*iHit->GetZL();
505 Float_t xPix = kconv*iHit->GetXL();
506 Float_t yPix = kconv*iHit->GetYL();
507
508 // Get track status
509 Int_t status = iHit->GetTrackStatus();
409f8c84 510
511 // Check boundaries
512 if(zPix > spdLength/2) {
f74211b0 513#ifdef DEBUG
514 cout<<"!!! SPD: z outside ="<<zPix<<endl;
515#endif
2cc6b29a 516 zPix = spdLength/2 - 10;
409f8c84 517 }
518 if(zPix < 0 && zPix < -spdLength/2) {
f74211b0 519#ifdef DEBUG
520 cout<<"!!! SPD: z outside ="<<zPix<<endl;
521#endif
2cc6b29a 522 zPix = -spdLength/2 + 10;
409f8c84 523 }
524 if(xPix > spdWidth/2) {
f74211b0 525#ifdef DEBUG
526 cout<<"!!! SPD: x outside ="<<xPix<<endl;
527#endif
2cc6b29a 528 xPix = spdWidth/2 - 10;
409f8c84 529 }
530 if(xPix < 0 && xPix < -spdWidth/2) {
f74211b0 531#ifdef DEBUG
532 cout<<"!!! SPD: x outside ="<<xPix<<endl;
533#endif
2cc6b29a 534 xPix = -spdWidth/2 + 10;
409f8c84 535 }
536 Int_t trdown = 0;
537
538 // enter Si or after event in Si
539 if (status == 66 ) {
2cc6b29a 540 zPix0 = zPix;
541 xPix0 = xPix;
542 yPrev = yPix;
543 } // end if status == 66
409f8c84 544
545 Float_t depEnergy = iHit->GetIonization();
546 // skip if the input point to Si
547
548 if(depEnergy <= 0.) continue;
549
550 // if track returns to the opposite direction:
551 if (yPix < yPrev) {
552 trdown = 1;
2cc6b29a 553 } // end if yPix < yPrev
409f8c84 554
555 // take into account the holes diffusion inside the Silicon
556 // the straight line between the entrance and exit points in Si is
557 // divided into the several steps; the diffusion is considered
558 // for each end point of step and charge
559 // is distributed between the pixels through the diffusion.
409f8c84 560
561 // ---------- the diffusion in Z (beam) direction -------
409f8c84 562 Float_t charge = depEnergy*kEnToEl; // charge in e-
563 Float_t drPath = 0.;
564 Float_t tang = 0.;
565 Float_t sigmaDif = 0.;
566 Float_t zdif = zPix - zPix0;
567 Float_t xdif = xPix - xPix0;
568 Float_t ydif = TMath::Abs(yPix - yPrev);
569 Float_t ydif0 = TMath::Abs(yPrev - yPix0);
570
571 if(ydif < 1) continue; // ydif is not zero
572
573 Float_t projDif = sqrt(xdif*xdif + zdif*zdif);
574
575 Int_t ndZ = (Int_t)TMath::Abs(zdif/zPitch) + 1;
576 Int_t ndX = (Int_t)TMath::Abs(xdif/xPitch) + 1;
577
578 // number of the steps along the track:
579 Int_t nsteps = ndZ;
580 if(ndX > ndZ) nsteps = ndX;
338e4f06 581 if(nsteps < 20) nsteps = 20; // minimum number of the steps
409f8c84 582
583 if (projDif < 5 ) {
2cc6b29a 584 drPath = (yPix-yPix0)*1.e-4;
585 drPath = TMath::Abs(drPath); // drift path in cm
586 sigmaDif = difCoef*sqrt(drPath); // sigma diffusion in cm
587 sigmaDif = sigmaDif*kconv; // sigma diffusion in microns
588 nsteps = 1;
589 } // end if projDif < 5
409f8c84 590
591 if(projDif > 5) tang = ydif/projDif;
592 Float_t dCharge = charge/nsteps; // charge in e- for one step
593 Float_t dZ = zdif/nsteps;
594 Float_t dX = xdif/nsteps;
595
2cc6b29a 596 for (iZi = 1; iZi <= nsteps;iZi++) {
597 Float_t dZn = iZi*dZ;
409f8c84 598 Float_t dXn = iZi*dX;
599 Float_t zPixn = zPix0 + dZn;
600 Float_t xPixn = xPix0 + dXn;
601
602 if(projDif >= 5) {
2cc6b29a 603 Float_t dProjn = sqrt(dZn*dZn+dXn*dXn);
604 drPath = dProjn*tang*1.e-4; // drift path for iZi+1 step in cm
605 if(trdown == 0) {
606 drPath = TMath::Abs(drPath) + ydif0*1.e-4;
607 }// end if trdow ==0
608 if(trdown == 1) {
609 drPath = ydif0*1.e-4 - TMath::Abs(drPath);
610 drPath = TMath::Abs(drPath);
611 } // end if trdown == 1
612 sigmaDif = difCoef*sqrt(drPath);
613 sigmaDif = sigmaDif*kconv; // sigma diffusion in microns
614 } // end if projdif >= 5
409f8c84 615
616 zPixn = (zPixn + spdLength/2.);
617 xPixn = (xPixn + spdWidth/2.);
618 Int_t nZpix, nXpix;
619 fSegmentation->GetPadIxz(xPixn,zPixn,nXpix,nZpix);
620 zPitch = fSegmentation->Dpz(nZpix);
621 fSegmentation->GetPadTxz(xPixn,zPixn);
622 // set the window for the integration
623 Int_t jzmin = 1;
624 Int_t jzmax = 3;
625 if(nZpix == 1) jzmin =2;
626 if(nZpix == fNPixelsZ) jzmax = 2;
627
628 Int_t jxmin = 1;
629 Int_t jxmax = 3;
630 if(nXpix == 1) jxmin =2;
631 if(nXpix == fNPixelsX) jxmax = 2;
632
633 Float_t zpix = nZpix;
634 Float_t dZright = zPitch*(zpix - zPixn);
635 Float_t dZleft = zPitch - dZright;
636
637 Float_t xpix = nXpix;
638 Float_t dXright = xPitch*(xpix - xPixn);
639 Float_t dXleft = xPitch - dXright;
640
641 Float_t dZprev = 0.;
642 Float_t dZnext = 0.;
643 Float_t dXprev = 0.;
644 Float_t dXnext = 0.;
645
646 for(jz=jzmin; jz <=jzmax; jz++) {
647 if(jz == 1) {
2cc6b29a 648 dZprev = -zPitch - dZleft;
649 dZnext = -dZleft;
650 } else if(jz == 2) {
651 dZprev = -dZleft;
652 dZnext = dZright;
653 } else if(jz == 3) {
654 dZprev = dZright;
655 dZnext = dZright + zPitch;
656 } // end if jz
409f8c84 657 // kz changes from 1 to the fNofPixels(270)
658 Int_t kz = nZpix + jz -2;
659
660 Float_t zArg1 = dZprev/sigmaDif;
661 Float_t zArg2 = dZnext/sigmaDif;
662 Float_t zProb1 = TMath::Erfc(zArg1);
663 Float_t zProb2 = TMath::Erfc(zArg2);
664 Float_t dZCharge =0.5*(zProb1-zProb2)*dCharge;
665
666
667 // ----------- holes diffusion in X(r*phi) direction --------
668
669 if(dZCharge > 1.) {
2cc6b29a 670 for(jx=jxmin; jx <=jxmax; jx++) {
671 if(jx == 1) {
672 dXprev = -xPitch - dXleft;
673 dXnext = -dXleft;
674 } else if(jx == 2) {
675 dXprev = -dXleft;
676 dXnext = dXright;
677 } else if(jx == 3) {
678 dXprev = dXright;
679 dXnext = dXright + xPitch;
680 } // end if jx
681 Int_t kx = nXpix + jx -2;
682 Float_t xArg1 = dXprev/sigmaDif;
683 Float_t xArg2 = dXnext/sigmaDif;
684 Float_t xProb1 = TMath::Erfc(xArg1);
685 Float_t xProb2 = TMath::Erfc(xArg2);
686 Float_t dXCharge =0.5*(xProb1-xProb2)*dZCharge;
687
688 if(dXCharge > 1.) {
2cc6b29a 689 if (first) {
f74211b0 690 indexRange[0]=indexRange[1]=kz-1;
2cc6b29a 691 indexRange[2]=indexRange[3]=kx-1;
692 first=kFALSE;
693 } // end if first
694 indexRange[0]=TMath::Min(indexRange[0],kz-1);
695 indexRange[1]=TMath::Max(indexRange[1],kz-1);
696 indexRange[2]=TMath::Min(indexRange[2],kx-1);
697 indexRange[3]=TMath::Max(indexRange[3],kx-1);
f74211b0 698/*
2cc6b29a 699 // build the list of digits for this module
f74211b0 700 Double_t signal = fMapA2->GetSignal(kz-1,kx-1);
2cc6b29a 701 signal+=dXCharge;
f74211b0 702 fMapA2->SetHit(kz-1,kx-1,(double)signal);
703*/
2cc6b29a 704 // The calling sequence for UpdateMapSignal was
705 // moved into the (dx > 1 e-) loop because it
706 // needs to call signal which is defined inside
707 // this loop
2cc6b29a 708 fModule = module;//Defined because functions
709 // called by UpdateMapSignal
710 // expect module to be an
711 // integer
7d50ea21 712 UpdateMapSignal(kz-1,kx-1,
ee86d557 713// mod->GetHitTrackIndex(hit),
714 ((AliITShit*)(mod->GetHit(hit)))->GetTrack(),
f74211b0 715 hit,fModule,dXCharge,pList);
2cc6b29a 716 } // dXCharge > 1 e-
717 } // jx loop
409f8c84 718 } // dZCharge > 1 e-
719 } // jz loop
720 } // iZi loop
409f8c84 721 if (status == 65) { // the step is inside of Si
2cc6b29a 722 zPix0 = zPix;
723 xPix0 = xPix;
724 } // end if status == 65
725 yPrev = yPix;
409f8c84 726 } // hit loop inside the module
409f8c84 727}
2cc6b29a 728//______________________________________________________________________
729void AliITSsimulationSPDdubna::ChargeToSignal(AliITSpList *pList){
730 // add noise and electronics, perform the zero suppression and add the
731 // digit to the list
f74211b0 732 static AliITS *aliITS = (AliITS*)gAlice->GetModule("ITS");
2cc6b29a 733 Float_t threshold = (float)fResponse->MinVal();
f74211b0 734 Int_t j;
735// Int_t digits[3], tracks[3], hits[3];
736// Float_t charges[3];
2cc6b29a 737 Float_t electronics;
f74211b0 738// Float_t phys;
2cc6b29a 739 Double_t sig;
ee86d557 740 const Int_t nmaxtrk=AliITSdigitSPD::GetNTracks();
f74211b0 741 static AliITSdigitSPD dig;
742
2cc6b29a 743 for(Int_t iz=0; iz<fNPixelsZ; iz++){
744 for(Int_t ix=0; ix<fNPixelsX; ix++){
745 electronics = fBaseline + fNoise*gRandom->Gaus();
f74211b0 746 sig = pList->GetSignalOnly(iz,ix);
747 UpdateMapNoise(iz,ix,fModule,sig,electronics,pList);
748#ifdef DEBUG
749// cout << sig << "+" << electronics <<">threshold=" << threshold
750// << endl;
751#endif
752 if (sig+electronics > threshold) {
753 dig.fCoord1 = iz;
754 dig.fCoord2 = ix;
755 dig.fSignal = 1;
756 dig.fSignalSPD = (Int_t) pList->GetSignal(iz,ix);
757 /*
758 digits[0] = iz;
759 digits[1] = ix;
760 digits[2] = 1; */
761 for(j=0;j<nmaxtrk;j++){
762// charges[j] = 0.0;
ee86d557 763 if (j<pList->GetNEnteries()) {
f74211b0 764 dig.fTracks[j] = pList->GetTrack(iz,ix,j);
765 dig.fHits[j] = pList->GetHit(iz,ix,j);
766 /*
767 tracks[j] = pList->GetTrack(iz,ix,j);
768 hits[j] = pList->GetHit(iz,ix,j);
769 */
770 }else { // Default values
ee86d557 771 dig.fTracks[j] = -3;
772 dig.fHits[j] = -1;
f74211b0 773/* tracks[j] = -2; //noise
774 hits[j] = -1; */
2cc6b29a 775 } // end if pList
f74211b0 776 } // end for j
777// charges[0] = (Float_t) pList->GetSumSignal(iz,ix);
778/*
2cc6b29a 779 if(tracks[0] == tracks[1] && tracks[0] == tracks[2]) {
780 tracks[1] = -3;
781 hits[1] = -1;
782 tracks[2] = -3;
783 hits[2] = -1;
784 } else if(tracks[0] == tracks[1] && tracks[0] != tracks[2]) {
785 tracks[1] = -3;
786 hits[1] = -1;
787 } else if(tracks[0] == tracks[2] && tracks[0] != tracks[1]) {
788 tracks[2] = -3;
789 hits[2] = -1;
790 } else if(tracks[1] == tracks[2] && tracks[0] != tracks[1]) {
791 tracks[2] = -3;
792 hits[2] = -1;
793 } // end if
f74211b0 794*/
795// phys = 0.0;
796#ifdef DEBUG
797 cout << iz << "," << ix << "," <<
798 *(pList->GetpListItem(iz,ix)) << endl;
799#endif
800// aliITS->AddSimDigit(0, phys, digits, tracks, hits, charges);
801 aliITS->AddSimDigit(0,&dig);
2cc6b29a 802 } //
803 } //
804 } //
409f8c84 805}
2cc6b29a 806//______________________________________________________________________
807void AliITSsimulationSPDdubna::CreateHistograms(){
808 // create 1D histograms for tests
809
810 printf("SPD - create histograms\n");
811
812 fHis=new TObjArray(fNPixelsZ);
813 TString spdName("spd_");
814 for (Int_t i=0;i<fNPixelsZ;i++) {
815 Char_t pixelz[4];
816 sprintf(pixelz,"%d",i+1);
817 spdName.Append(pixelz);
818 //PH (*fHis)[i] = new TH1F(spdName.Data(),"SPD maps",
819 //PH fNPixelsX,0.,(Float_t) fNPixelsX);
820 fHis->AddAt(new TH1F(spdName.Data(),"SPD maps",
821 fNPixelsX,0.,(Float_t) fNPixelsX), i);
822 } // end for i
409f8c84 823}
2cc6b29a 824//______________________________________________________________________
825void AliITSsimulationSPDdubna::ResetHistograms(){
409f8c84 826 //
827 // Reset histograms for this detector
828 //
829
830 for ( int i=0;i<fNPixelsZ;i++ ) {
2cc6b29a 831 //PH if ((*fHis)[i]) ((TH1F*)(*fHis)[i])->Reset();
2682e810 832 if (fHis->At(i)) ((TH1F*)fHis->At(i))->Reset();
2cc6b29a 833 } // end for i
409f8c84 834}