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Include TObjArray.h since we have objects and references of this type (Matthias)
[u/mrichter/AliRoot.git] / TPC / AliTPCFast.cxx
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6d75e4b6 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/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// fast TPC cluster simulation //
21// //
22///////////////////////////////////////////////////////////////////////////////
23
24#include <TParticle.h>
e8d02863 25#include <TVector.h>
e939a978 26#include <TRandom.h>
6d75e4b6 27
28#include "AliRunLoader.h"
29#include "AliRun.h"
30#include "AliMC.h"
31#include "AliTPC.h"
32#include "AliTPCParam.h"
33#include "AliTPCClustersArray.h"
34#include "AliTPCClustersRow.h"
35#include "AliTPCcluster.h"
36#include "AliComplexCluster.h"
37#include "AliTPCFast.h"
8c2b3fd7 38#include "AliLog.h"
6d75e4b6 39
40ClassImp(AliTPCFast)
179c6296 41 //____________________________________________________________________
42AliTPCFast::AliTPCFast(const AliTPCFast &param)
43 :TObject(param),fParam(0)
6d75e4b6 44
179c6296 45{
46 //
47 // copy constructor - dummy
48 //
49 fParam = param.fParam;
50}
51AliTPCFast & AliTPCFast::operator =(const AliTPCFast & param)
52{
53 //
54 // assignment operator - dummy
55 //
56 fParam=param.fParam;
57 return (*this);
58}
6d75e4b6 59
60//_____________________________________________________________________________
61void AliTPCFast::Hits2Clusters(AliRunLoader* runLoader) const
62{
63 //--------------------------------------------------------
64 // TPC simple cluster generator from hits
65 // obtained from the TPC Fast Simulator
66 // The point errors are taken from the parametrization
67 //--------------------------------------------------------
68
69 //-----------------------------------------------------------------
70 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
71 //-----------------------------------------------------------------
72 // Adopted to Marian's cluster data structure by I.Belikov, CERN,
73 // Jouri.Belikov@cern.ch
74 //----------------------------------------------------------------
75
76 /////////////////////////////////////////////////////////////////////////////
77 //
78 //---------------------------------------------------------------------
79 // ALICE TPC Cluster Parameters
80 //--------------------------------------------------------------------
81
82
83
84 // Cluster width in rphi
85 const Float_t kACrphi=0.18322;
86 const Float_t kBCrphi=0.59551e-3;
87 const Float_t kCCrphi=0.60952e-1;
88 // Cluster width in z
89 const Float_t kACz=0.19081;
90 const Float_t kBCz=0.55938e-3;
91 const Float_t kCCz=0.30428;
92
93
94 AliLoader* loader = runLoader->GetLoader("TPCLoader");
95 if (!loader) {
8c2b3fd7 96 AliError("No TPC loader found");
6d75e4b6 97 return;
98 }
99 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
100 AliRun* aliRun = runLoader->GetAliRun();
101 if (!aliRun) {
8c2b3fd7 102 AliError("Couldn't get AliRun object");
6d75e4b6 103 return;
104 }
105 AliTPC* tpc = (AliTPC*) aliRun->GetDetector("TPC");
106 if (!tpc) {
8c2b3fd7 107 AliError("Couldn't get TPC detector");
6d75e4b6 108 return;
109 }
110 AliTPCParam* param = tpc->GetParam();
111 if (!param) {
8c2b3fd7 112 AliError("No TPC parameters available");
6d75e4b6 113 return;
114 }
115
116 //if(fDefaults == 0) SetDefaults();
117
118 Float_t sigmaRphi,sigmaZ,clRphi,clZ;
119 //
120 TParticle *particle; // pointer to a given particle
121 AliTPChit *tpcHit; // pointer to a sigle TPC hit
122 Int_t sector;
123 Int_t ipart;
124 Float_t xyz[5];
125 Float_t pl,pt,tanth,rpad,ratio;
126 Float_t cph,sph;
127
128 //---------------------------------------------------------------
129 // Get the access to the tracks
130 //---------------------------------------------------------------
131
132 TTree *tH = loader->TreeH();
133 if (tH == 0x0)
8c2b3fd7 134 AliFatal("Can not find TreeH in folder");
135
6d75e4b6 136 tpc->SetTreeAddress();
137
138 Stat_t ntracks = tH->GetEntries();
139
140 //Switch to the output file
141
142 if (loader->TreeR() == 0x0) loader->MakeTree("R");
143
8c2b3fd7 144 AliDebug(1,Form("param->GetTitle() = %s",param->GetTitle()));
6d75e4b6 145
146 runLoader->CdGAFile();
147 //param->Write(param->GetTitle());
148
149 AliTPCClustersArray carray;
150 carray.Setup(param);
151 carray.SetClusterType("AliTPCcluster");
152 carray.MakeTree(loader->TreeR());
153
154 Int_t nclusters=0; //cluster counter
155
156 //------------------------------------------------------------
157 // Loop over all sectors (72 sectors for 20 deg
158 // segmentation for both lower and upper sectors)
159 // Sectors 0-35 are lower sectors, 0-17 z>0, 17-35 z<0
160 // Sectors 36-71 are upper sectors, 36-53 z>0, 54-71 z<0
161 //
162 // First cluster for sector 0 starts at "0"
163 //------------------------------------------------------------
164
165 for(Int_t isec=0;isec<param->GetNSector();isec++){
166 //MI change
167 param->AdjustCosSin(isec,cph,sph);
168
169 //------------------------------------------------------------
170 // Loop over tracks
171 //------------------------------------------------------------
172
173 for(Int_t track=0;track<ntracks;track++){
174 tpc->ResetHits();
175 tH->GetEvent(track);
176 //
177 // Get number of the TPC hits
178 //
179 tpcHit = (AliTPChit*)tpc->FirstHit(-1);
180
181 // Loop over hits
182 //
183 while(tpcHit){
8ebf1d48 184
6d75e4b6 185 if (tpcHit->fQ == 0.) {
186 tpcHit = (AliTPChit*) tpc->NextHit();
187 continue; //information about track (I.Belikov)
188 }
8ebf1d48 189 sector=tpcHit->fSector; // sector number
190
191 if(sector != isec){
192 tpcHit = (AliTPChit*) tpc->NextHit();
193 continue;
194 }
195 ipart=tpcHit->Track();
196 particle=aliRun->GetMCApp()->Particle(ipart);
197 pl=particle->Pz();
198 pt=particle->Pt();
199 if(pt < 1.e-9) pt=1.e-9;
200 tanth=pl/pt;
201 tanth = TMath::Abs(tanth);
202 rpad=TMath::Sqrt(tpcHit->X()*tpcHit->X() + tpcHit->Y()*tpcHit->Y());
203 ratio=0.001*rpad/pt; // pt must be in MeV/c - historical reason
204
205 // space-point resolutions
206
6d75e4b6 207 sigmaRphi=AliTPCcluster::SigmaY2(rpad,tanth,pt);
208 sigmaZ =AliTPCcluster::SigmaZ2(rpad,tanth );
209
210 // cluster widths
211
212 clRphi=kACrphi-kBCrphi*rpad*tanth+kCCrphi*ratio*ratio;
213 clZ=kACz-kBCz*rpad*tanth+kCCz*tanth*tanth;
214
215 // temporary protection
216
217 if(sigmaRphi < 0.) sigmaRphi=0.4e-3;
218 if(sigmaZ < 0.) sigmaZ=0.4e-3;
219 if(clRphi < 0.) clRphi=2.5e-3;
220 if(clZ < 0.) clZ=2.5e-5;
221
222 //
223
224 //
225 // smearing --> rotate to the 1 (13) or to the 25 (49) sector,
226 // then the inaccuracy in a X-Y plane is only along Y (pad row)!
227 //
228 Float_t xprim= tpcHit->X()*cph + tpcHit->Y()*sph;
229 Float_t yprim=-tpcHit->X()*sph + tpcHit->Y()*cph;
230 xyz[0]=gRandom->Gaus(yprim,TMath::Sqrt(sigmaRphi)); // y
231 Float_t alpha=(isec < param->GetNInnerSector()) ?
232 param->GetInnerAngle() : param->GetOuterAngle();
233 Float_t ymax=xprim*TMath::Tan(0.5*alpha);
234 if (TMath::Abs(xyz[0])>ymax) xyz[0]=yprim;
235 xyz[1]=gRandom->Gaus(tpcHit->Z(),TMath::Sqrt(sigmaZ)); // z
a1ec4d07 236 if (TMath::Abs(xyz[1])>param->GetZLength(isec)) xyz[1]=tpcHit->Z();
6d75e4b6 237 xyz[2]=sigmaRphi; // fSigmaY2
238 xyz[3]=sigmaZ; // fSigmaZ2
239 xyz[4]=tpcHit->fQ; // q
240
241 AliTPCClustersRow *clrow=carray.GetRow(sector,tpcHit->fPadRow);
242 if (!clrow) clrow=carray.CreateRow(sector,tpcHit->fPadRow);
243
244 Int_t tracks[3]={tpcHit->Track(), -1, -1};
245 AliTPCcluster cluster(tracks,xyz);
246
247 clrow->InsertCluster(&cluster); nclusters++;
248
249 tpcHit = (AliTPChit*)tpc->NextHit();
250
251
252 } // end of loop over hits
253
254 } // end of loop over tracks
255
256 Int_t nrows=param->GetNRow(isec);
257 for (Int_t irow=0; irow<nrows; irow++) {
258 AliTPCClustersRow *clrow=carray.GetRow(isec,irow);
259 if (!clrow) continue;
260 carray.StoreRow(isec,irow);
261 carray.ClearRow(isec,irow);
262 }
263
264 } // end of loop over sectors
265
266 // cerr<<"Number of made clusters : "<<nclusters<<" \n";
267 loader->WriteRecPoints("OVERWRITE");
268
269
270} // end of function
271
8ebf1d48 272
273
274//_________________________________________________________________
275
276
277
278void AliTPCFast::Hits2ExactClusters(AliRunLoader* runLoader) const{
279
280
281
282 AliLoader* loader = runLoader->GetLoader("TPCLoader");
283 if (!loader) {
284 AliError("No TPC loader found");
285 return;
286 }
287 AliTPC* tpc = (AliTPC*) gAlice->GetDetector("TPC");
288 if (!tpc) {
289 AliError("Couldn't get TPC detector");
290 return;
291 }
292 AliTPCParam* param = tpc->GetParam();
293 if (!param) {
294 AliError("No TPC parameters available");
295 return;
296 }
297 //---------------------------------------------------------------
298 // Get the access to the tracks
299 //---------------------------------------------------------------
300
301 TTree *tH = loader->TreeH();
302 if (tH == 0x0) { runLoader->LoadHits("TPC"); loader->TreeH();}
303
304 tpc->SetTreeAddress();
305
306
307 //Switch to the output file
308
309 if (loader->TreeR() == 0x0) loader->MakeTree("R");
310
311 AliDebug(1,Form("param->GetTitle() = %s",param->GetTitle()));
312
313 runLoader->CdGAFile();
314 //param->Write(param->GetTitle());
315
316 AliTPCClustersArray carray;
317 carray.Setup(param);
318 carray.SetClusterType("AliTPCclusterMI");
319 carray.MakeTree(loader->TreeR());
320
321 //------------------------------------------------------------
322 // Loop over all sectors (72 sectors for 20 deg)
323 //------------------------------------------------------------
324
325 for(Int_t isec=0;isec<param->GetNSector();isec++){
326 Hits2ExactClustersSector(runLoader, &carray, isec);
327 } // end of loop over sectors
328 loader->WriteRecPoints("OVERWRITE");
329}
330
331
332
333
6d75e4b6 334//_________________________________________________________________
335void AliTPCFast::Hits2ExactClustersSector(AliRunLoader* runLoader,
336 AliTPCClustersArray* clustersArray,
337 Int_t isec) const
338{
339 //--------------------------------------------------------
340 //calculate exact cross point of track and given pad row
8ebf1d48 341 //resulting values are expressed in "local" coordinata
342 //the sigmaY2 and sigmaZ2 of cluster are the shape of cluster parameters
343 // - thay are used later on for error parameterization
6d75e4b6 344 //--------------------------------------------------------
345
346 //-----------------------------------------------------------------
347 // Origin: Marian Ivanov GSI Darmstadt, m.ivanov@gsi.de
348 //-----------------------------------------------------------------
349 //
350 if (clustersArray==0){
351 return;
352 }
353 AliLoader* loader = runLoader->GetLoader("TPCLoader");
354 if (!loader) {
8c2b3fd7 355 AliError("No TPC loader found");
6d75e4b6 356 return;
357 }
358 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
359 AliRun* aliRun = runLoader->GetAliRun();
360 if (!aliRun) {
8c2b3fd7 361 AliError("Couldn't get AliRun object");
6d75e4b6 362 return;
363 }
364 AliTPC* tpc = (AliTPC*) aliRun->GetDetector("TPC");
365 if (!tpc) {
8c2b3fd7 366 AliError("Couldn't get TPC detector");
6d75e4b6 367 return;
368 }
369 AliTPCParam* param = tpc->GetParam();
370 if (!param) {
8c2b3fd7 371 AliError("No TPC parameters available");
6d75e4b6 372 return;
373 }
374 //
8ebf1d48 375 //
6d75e4b6 376 AliTPChit *tpcHit; // pointer to a sigle TPC hit
377 // Int_t sector,nhits;
378 Int_t ipart;
379 const Int_t kcmaxhits=30000;
8c2b3fd7 380 TVector * xxxx = new TVector(kcmaxhits*4);
381 TVector & xxx = *xxxx;
6d75e4b6 382 Int_t maxhits = kcmaxhits;
383 //construct array for each padrow
384 for (Int_t i=0; i<param->GetNRow(isec);i++)
385 clustersArray->CreateRow(isec,i);
386
387 //---------------------------------------------------------------
388 // Get the access to the tracks
389 //---------------------------------------------------------------
390
391 TTree *tH = loader->TreeH();
392 if (tH == 0x0)
8c2b3fd7 393 AliFatal("Can not find TreeH in folder");
394
6d75e4b6 395 tpc->SetTreeAddress();
396
397 Stat_t ntracks = tH->GetEntries();
6d75e4b6 398 //MI change
399 TBranch * branch=0;
400 if (tpc->GetHitType()>1) branch = tH->GetBranch("TPC2");
401 else branch = tH->GetBranch("TPC");
402
403 //------------------------------------------------------------
404 // Loop over tracks
405 //------------------------------------------------------------
406
407 for(Int_t track=0;track<ntracks;track++){
408 Bool_t isInSector=kTRUE;
409 tpc->ResetHits();
8ebf1d48 410 isInSector = tpc->TrackInVolume(isec,track);
6d75e4b6 411 if (!isInSector) continue;
412 //MI change
413 branch->GetEntry(track); // get next track
414 //
6d75e4b6 415 // Loop over hits
416 //
417 Int_t currentIndex=0;
418 Int_t lastrow=-1; //last writen row
419
420 //M.I. changes
421
422 tpcHit = (AliTPChit*)tpc->FirstHit(-1);
423 while(tpcHit){
424
425 Int_t sector=tpcHit->fSector; // sector number
426 if(sector != isec){
427 tpcHit = (AliTPChit*) tpc->NextHit();
428 continue;
429 }
430
431 ipart=tpcHit->Track();
6d75e4b6 432
433 //find row number
434
435 Float_t x[3]={tpcHit->X(),tpcHit->Y(),tpcHit->Z()};
436 Int_t index[3]={1,isec,0};
8ebf1d48 437 Int_t currentrow = param->GetPadRow(x,index);
438
6d75e4b6 439 if (currentrow<0) {tpcHit = (AliTPChit*)tpc->NextHit(); continue;}
440 if (lastrow<0) lastrow=currentrow;
8ebf1d48 441 //
442 //
443 if (currentrow!=lastrow){
6d75e4b6 444 if (currentIndex>2){
445 Float_t sumx=0;
446 Float_t sumx2=0;
447 Float_t sumx3=0;
448 Float_t sumx4=0;
449 Float_t sumy=0;
450 Float_t sumxy=0;
451 Float_t sumx2y=0;
452 Float_t sumz=0;
453 Float_t sumxz=0;
454 Float_t sumx2z=0;
455 Float_t sumq=0;
456 for (Int_t index=0;index<currentIndex;index++){
457 Float_t x,x2,x3,x4;
458 x=x2=x3=x4=xxx(index*4);
459 x2*=x;
460 x3*=x2;
461 x4*=x3;
462 sumx+=x;
463 sumx2+=x2;
464 sumx3+=x3;
465 sumx4+=x4;
466 sumy+=xxx(index*4+1);
467 sumxy+=xxx(index*4+1)*x;
468 sumx2y+=xxx(index*4+1)*x2;
469 sumz+=xxx(index*4+2);
470 sumxz+=xxx(index*4+2)*x;
471 sumx2z+=xxx(index*4+2)*x2;
472 sumq+=xxx(index*4+3);
473 }
6d75e4b6 474 Float_t det=currentIndex*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumx*sumx4-sumx2*sumx3)+
475 sumx2*(sumx*sumx3-sumx2*sumx2);
476
477 Float_t detay=sumy*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxy*sumx4-sumx2y*sumx3)+
478 sumx2*(sumxy*sumx3-sumx2y*sumx2);
479 Float_t detaz=sumz*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxz*sumx4-sumx2z*sumx3)+
480 sumx2*(sumxz*sumx3-sumx2z*sumx2);
481
482 Float_t detby=currentIndex*(sumxy*sumx4-sumx2y*sumx3)-sumy*(sumx*sumx4-sumx2*sumx3)+
483 sumx2*(sumx*sumx2y-sumx2*sumxy);
484 Float_t detbz=currentIndex*(sumxz*sumx4-sumx2z*sumx3)-sumz*(sumx*sumx4-sumx2*sumx3)+
485 sumx2*(sumx*sumx2z-sumx2*sumxz);
486
8ebf1d48 487 if (TMath::Abs(det)<0.00000000000000001){
6d75e4b6 488 tpcHit = (AliTPChit*)tpc->NextHit();
489 continue;
490 }
491
8ebf1d48 492 Float_t y=detay/det;
493 Float_t z=detaz/det;
6d75e4b6 494 Float_t by=detby/det; //y angle
495 Float_t bz=detbz/det; //z angle
496 sumy/=Float_t(currentIndex);
497 sumz/=Float_t(currentIndex);
498
6d75e4b6 499
8ebf1d48 500 //
501 //
502 Float_t sign = (tpcHit->Z()>0)? 1.:-1.;
503 y = (y+0.5)*param->GetPadPitchWidth(isec);
504 z = z*param->GetZWidth();
505 //
506 // y expected shape
507 Double_t sigmay2 = z*fParam->GetDiffL();
508 sigmay2 *= sigmay2;
509 Float_t angulary = by*param->GetPadPitchLength(isec,lastrow);
510 angulary*=angulary;
511 angulary/=12;
512 sigmay2 +=angulary+0.25*param->GetPadPitchWidth(isec)*param->GetPadPitchWidth(isec);
513 //
514 // z expected shape
515 Double_t sigmaz2 = z*fParam->GetDiffT();
516 sigmaz2 *= sigmaz2;
517 Float_t angularz = bz*param->GetPadPitchLength(isec,lastrow);
518 angularz*=angularz;
519 angularz/=12;
520 sigmaz2 +=angularz+0.25;
521 //
522 sigmaz2 = TMath::Min(sigmaz2,1.);
523 sigmay2 = TMath::Min(sigmay2,1.);
524 //
525 //
a1ec4d07 526 z = sign*(param->GetZLength(isec) - z);
527 if (TMath::Abs(z)< param->GetZLength(isec)-1){
8ebf1d48 528 AliTPCClustersRow * row = (clustersArray->GetRow(isec,lastrow));
529 if (row!=0) {
530 AliTPCclusterMI* cl = new((AliTPCclusterMI*)row->Append()) AliTPCclusterMI ;
531 // AliTPCclusterMI cl;
532 cl->SetZ(z);
533 cl->SetY(y);
534 cl->SetQ(sumq);
535 if (TMath::Abs(sumq)<1000){
536 cl->SetMax(Short_t(sumq));
537 }
538 else{
539 cl->SetMax(0);
540 }
541 cl->SetSigmaZ2(sigmaz2);
542 cl->SetSigmaY2(sigmay2);
543 cl->SetLabel(ipart,0);
544 cl->SetLabel(-1,1);
545 cl->SetLabel(-1,2);
546 cl->SetType(0);
547 }
548 }
549 } //end of calculating cluster for given row
550 currentIndex=0;
551 lastrow=currentrow;
552 } // end of crossing rows
553 //
6d75e4b6 554 if ( currentIndex>=maxhits){
555 maxhits+=kcmaxhits;
556 xxx.ResizeTo(4*maxhits);
557 }
558 xxx(currentIndex*4)=x[0];
559 xxx(currentIndex*4+1)=x[1];
560 xxx(currentIndex*4+2)=x[2];
561 xxx(currentIndex*4+3)=tpcHit->fQ;
562 currentIndex++;
8ebf1d48 563 tpcHit = (AliTPChit*)tpc->NextHit();
564 } // end of loop over hits
565 } // end of loop over tracks
566 //write padrows to tree
567 for (Int_t ii=0; ii<param->GetNRow(isec);ii++) {
568 clustersArray->StoreRow(isec,ii);
569 clustersArray->ClearRow(isec,ii);
570 }
6d75e4b6 571 xxxx->Delete();
8ebf1d48 572
6d75e4b6 573}
574
8ebf1d48 575