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[u/mrichter/AliRoot.git] / PHOS / AliPHOSDebug.cxx
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b37750a6 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// Implementation version v1 of PHOS Manager class
20//---
b37750a6 21// Layout EMC + CPV has name IHEP:
22// Produces hits for CPV, cumulated hits
23//---
b37750a6 24//*-- Author: Yves Schutz (SUBATECH)
25
26
27// --- ROOT system ---
28
29#include "TBRIK.h"
30#include "TNode.h"
31#include "TRandom.h"
32#include "TTree.h"
33
34
35// --- Standard library ---
36
37#include <stdio.h>
38#include <string.h>
39#include <stdlib.h>
40#include <strstream.h>
41
42// --- AliRoot header files ---
43
44#include "AliPHOSv1.h"
45#include "AliPHOSHit.h"
46#include "AliPHOSDigit.h"
f444a19f 47#include "AliPHOSReconstructor.h"
b37750a6 48#include "AliRun.h"
49#include "AliConst.h"
b37750a6 50
51ClassImp(AliPHOSv1)
52
53//____________________________________________________________________________
54AliPHOSv1::AliPHOSv1():
55AliPHOSv0()
56{
57 // ctor
58
59 fReconstructioner = 0;
60 fTrackSegmentMaker = 0;
61
62}
63
64//____________________________________________________________________________
65AliPHOSv1::AliPHOSv1(const char *name, const char *title):
66AliPHOSv0(name,title)
67{
68 // ctor : title is used to identify the layout
b37750a6 69 // IHEP = 5 modules (EMC + CPV )
b37750a6 70 //
71 // We store hits :
72 // - fHits (the "normal" one), which retains the hits associated with
73 // the current primary particle being tracked
74 // (this array is reset after each primary has been tracked).
75 //
76
77 fPinElectronicNoise = 0.010 ;
78 fDigitThreshold = 0.01 ; // 1 GeV
79 fDigitizeA= 0. ;
80 fDigitizeB = 10000000. ;
81
82
83 // We do not want to save in TreeH the raw hits
84 // But save the cumulated hits instead (need to create the branch myself)
85 // It is put in the Digit Tree because the TreeH is filled after each primary
86 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
87
88 fHits= new TClonesArray("AliPHOSHit",1000) ;
89
90 fNhits = 0 ;
91
92 fReconstructioner = 0;
93 fTrackSegmentMaker = 0;
94
95 fIshunt = 1 ; // All hits are associated with primary particles
96
97}
98
99//____________________________________________________________________________
f444a19f 100AliPHOSv1::AliPHOSv1(AliPHOSReconstructor * Reconstructioner, const char *name, const char *title):
b37750a6 101 AliPHOSv0(name,title)
102{
103 // ctor : title is used to identify the layout
b37750a6 104
105 fPinElectronicNoise = 0.010 ;
106
107 // We do not want to save in TreeH the raw hits
108
109 fDigits = 0 ;
110 fHits= new TClonesArray("AliPHOSHit",1000) ;
111
112 fNhits = 0 ;
113
114 fIshunt = 1 ; // All hits are associated with primary particles
115
116 // gets an instance of the geometry parameters class
fa7cce36 117 AliPHOSGeometry::GetInstance(title, "") ;
b37750a6 118
fa7cce36 119 if (GetGeometry()->IsInitialized() )
21cd0c07 120 Info("AliPHOSv1", "AliPHOS %d : PHOS geometry intialized for %s", Version(), GetGeometry()->GetName() );
b37750a6 121 else
21cd0c07 122 Info("AliPHOSv1", "AliPHOS %d : PHOS geometry initialization failed !", Version() ) ;
b37750a6 123
124 // Defining the PHOS Reconstructioner
125
126 fReconstructioner = Reconstructioner ;
127
128}
129
130//____________________________________________________________________________
131AliPHOSv1::~AliPHOSv1()
132{
133 // dtor
134
135 if ( fHits) {
136 fHits->Delete() ;
137 delete fHits ;
138 fHits = 0 ;
139 }
140
141 if ( fSDigits) {
142 fSDigits->Delete() ;
143 delete fSDigits ;
144 fSDigits = 0 ;
145 }
146
147 if ( fDigits) {
148 fDigits->Delete() ;
149 delete fDigits ;
150 fDigits = 0 ;
151 }
152
153 if ( fEmcRecPoints ) {
154 fEmcRecPoints->Delete() ;
155 delete fEmcRecPoints ;
156 fEmcRecPoints = 0 ;
157 }
158
159 if ( fPpsdRecPoints ) {
160 fPpsdRecPoints->Delete() ;
161 delete fPpsdRecPoints ;
162 fPpsdRecPoints = 0 ;
163 }
164
165 if ( fTrackSegments ) {
166 fTrackSegments->Delete() ;
167 delete fTrackSegments ;
168 fTrackSegments = 0 ;
169 }
170
171}
172
173//____________________________________________________________________________
174void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits, Int_t trackpid, TLorentzVector p, Float_t * lpos)
175{
176 // Add a hit to the hit list.
177 // A PHOS hit is the sum of all hits in a single crystal
178 // or in a single PPSD gas cell
179
180 Int_t hitCounter ;
181 AliPHOSHit *newHit ;
182 AliPHOSHit *curHit ;
183 Bool_t deja = kFALSE ;
184
185 newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits, trackpid, p, lpos) ;
186
187 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
188 curHit = (AliPHOSHit*) (*fHits)[hitCounter] ;
189 if( *curHit == *newHit ) {
190 *curHit = *curHit + *newHit ;
191 deja = kTRUE ;
192 }
193 }
194
195 if ( !deja ) {
196 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
197 fNhits++ ;
198 }
199
200 delete newHit;
201}
202
203//____________________________________________________________________________
a4e98857 204void AliPHOSv1::Hits2SDigits()
205{
206 // Collects all hits in the same active volume into digit
207 // OBSOLETE replace by SDigitizer
b37750a6 208
209 Int_t i ;
210 Int_t j ;
211 AliPHOSHit * hit ;
212 AliPHOSDigit * newdigit ;
213 AliPHOSDigit * curdigit ;
214 Bool_t deja = kFALSE ;
215
216
217 Int_t itrack ;
218 for (itrack=0; itrack<gAlice->GetNtrack(); itrack++){
219
220 //=========== Get the Hits Tree for the Primary track itrack
88cb7938 221 gAlice->ResetHits();
222 if (TreeH() == 0x0)
223 {
224 Error("Hits2SDigits","Can not find TreeH in the folder");
225 return;
226 }
227 TreeH()->GetEvent(itrack);
b37750a6 228
229
230 for ( i = 0 ; i < fHits->GetEntries() ; i++ ) {
231 hit = (AliPHOSHit*)fHits->At(i) ;
232
233 // Assign primary number only if contribution is significant
234 if( hit->GetEnergy() > fDigitThreshold)
235 newdigit = new AliPHOSDigit( hit->GetPrimary(), hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
236 else
237 newdigit = new AliPHOSDigit( -1 , hit->GetId(), Digitize( hit->GetEnergy() ) ) ;
238 deja =kFALSE ;
239
240 for ( j = 0 ; j < fnSdigits ; j++) {
241 curdigit = (AliPHOSDigit*) fSDigits->At(j) ;
242 if ( *curdigit == *newdigit) {
243 *curdigit = *curdigit + *newdigit ;
244 deja = kTRUE ;
245 }
246 }
247
248 if ( !deja ) {
249 new((*fSDigits)[fnSdigits]) AliPHOSDigit(* newdigit) ;
250 fnSdigits++ ;
251 }
252
253 delete newdigit ;
254 }
255
256 } // loop over tracks
257
258 fSDigits->Sort() ;
259
260 fnSdigits = fSDigits->GetEntries() ;
261 fSDigits->Expand(fnSdigits) ;
262
263 for (i = 0 ; i < fnSdigits ; i++) {
264 AliPHOSDigit * digit = (AliPHOSDigit *) fSDigits->At(i) ;
265 digit->SetIndexInList(i) ;
266 }
267
268 gAlice->TreeS()->Fill() ;
269 gAlice->TreeS()->Write(0,TObject::kOverwrite) ;
270
271
272}
273//____________________________________________________________________________
a4e98857 274void AliPHOSv1::SDigits2Digits()
275{
276 // Adds noise to the summable digits and removes everething below thresholds
277 // Note, that sDigits should be SORTED in accordance with abs ID.
278 // OBSOLETE Replaced by Digitzer
b37750a6 279
280 gAlice->TreeS()->GetEvent(0) ;
281
282 // First calculate noise induced by the PIN diode of the PbWO crystals
283 Int_t iCurSDigit = 0 ;
284
285 //we assume, that there is al least one EMC digit...
286 if(fSDigits->GetEntries() == 0) {
21cd0c07 287 Warning("SDigits2Digits", "No SDigits !!! Do not produce Digits ") ;
b37750a6 288 return ;
289 }
290
291 Int_t idCurSDigit = ((AliPHOSDigit *)fSDigits->At(0))->GetId() ;
292
293 Int_t absID ;
fa7cce36 294 for(absID = 1; absID < GetGeometry()->GetNModules()*GetGeometry()->GetNPhi()*GetGeometry()->GetNZ(); absID++){
b37750a6 295 Float_t noise = gRandom->Gaus(0., fPinElectronicNoise) ;
296 if(absID < idCurSDigit ){
297 if(noise >fDigitThreshold ){
298 new((*fDigits)[fNdigits]) AliPHOSDigit( -1,absID,Digitize(noise) ) ;
299 fNdigits++ ;
300 }
301 }
302 else{ //add noise and may be remove the true hit
303 Float_t signal = noise + Calibrate(((AliPHOSDigit *)fSDigits->At(iCurSDigit))->GetAmp()) ;
304 if( signal >fDigitThreshold ){
305 AliPHOSDigit * digit = (AliPHOSDigit*) fSDigits->At(iCurSDigit) ;
306 new((*fDigits)[fNdigits]) AliPHOSDigit( *digit ) ;
307 ((AliPHOSDigit *)fDigits->At(fNdigits))->SetAmp(Digitize(signal));
308 fNdigits++ ;
309 }
310
311 if(iCurSDigit < fSDigits->GetEntries()-1){
312 iCurSDigit++ ;
313 idCurSDigit = ((AliPHOSDigit*)fSDigits->At(iCurSDigit))->GetId() ;
314 }
315 else
316 idCurSDigit = 10000000; //no real hits left
317 }
318
319 }
320
321 //remove PPSD/CPV digits below thresholds
322 Int_t idigit ;
323 for(idigit = iCurSDigit; idigit < fSDigits->GetEntries() ; idigit++){ //loop over CPV/PPSD digits
324
325 AliPHOSDigit * digit = (AliPHOSDigit *) fSDigits->At(idigit) ;
326 Float_t ene = Calibrate(digit->GetAmp()) ;
327
328 Int_t relid[4] ;
fa7cce36 329 GetGeometry()->AbsToRelNumbering(digit->GetId(), relid) ;
330 if ( relid[0] > GetGeometry()->GetNCPVModules() ){ //ppsd
b37750a6 331 if ( ( (relid[1] > 0) && (ene > fPpsdEnergyThreshold)) || //PPSD digit
332 ( (relid[1] < 0) && (ene > fCpvEnergyThreshold ) ) ) //CPV digit
333 new((*fDigits)[fNdigits]) AliPHOSDigit( *digit ) ;
334 fNdigits++ ;
335 }
336 }
337
338 fDigits->Compress() ;
339
340 fNdigits = fDigits->GetEntries() ;
341 fDigits->Expand(fNdigits) ;
342
343 Int_t i ;
344 for (i = 0 ; i < fNdigits ; i++) {
345 AliPHOSDigit * digit = (AliPHOSDigit *) fDigits->At(i) ;
346 digit->SetIndexInList(i) ;
347 }
348
349 gAlice->TreeD()->Fill() ;
350
351 gAlice->TreeD()->Write(0,TObject::kOverwrite) ;
352
353}
354
355//___________________________________________________________________________
356void AliPHOSv1::MakeBranch(Option_t* opt, char *file)
357{
a4e98857 358 // Called by AliRun
b37750a6 359
360 char *cH ;
361 // Create new branche in the current Root Tree in the digit Tree
362 AliDetector::MakeBranch(opt) ;
363
364
365 cH = strstr(opt,"S");
366 //Create a branch for SDigits
367 if( cH ){
368 char branchname[20];
369 sprintf(branchname,"%s",GetName());
370 if(fSDigits)
371 fSDigits->Clear();
372
373 fnSdigits = 0 ;
374 gAlice->MakeBranchInTree(gAlice->TreeS(),branchname,&fSDigits,fBufferSize,file);
375 }
376
377 cH = strstr(opt,"D");
378 //Create a branch for Digits
379 if( cH ){
380 char branchname[20];
381 sprintf(branchname,"%s",GetName());
382
383 if(fDigits)
384 fDigits->Clear();
385
386 gAlice->MakeBranchInTree(gAlice->TreeD(),branchname,&fDigits,fBufferSize,file);
387 }
388
389 cH = strstr(opt,"R");
390 //Create a branch for Reconstruction
391 if( cH ){
392 char branchname[20];
393
394 Int_t splitlevel = 0 ;
395
396 if(fEmcRecPoints)
397 fEmcRecPoints->Delete() ;
398
399 if ( fEmcRecPoints && gAlice->TreeR() ) {
400 sprintf(branchname,"%sEmcRP",GetName()) ;
401 gAlice->MakeBranchInTree(gAlice->TreeR(),branchname,"TObjArray",&fEmcRecPoints, fBufferSize, splitlevel,file);
402 }
403
404 if(fPpsdRecPoints)
405 fPpsdRecPoints->Delete() ;
406
407 if ( fPpsdRecPoints && gAlice->TreeR() ) {
408 sprintf(branchname,"%sPpsdRP",GetName()) ;
409 gAlice->MakeBranchInTree(gAlice->TreeR(),branchname,"TObjArray",&fPpsdRecPoints, fBufferSize, splitlevel,file);
410 }
411
412 if(fTrackSegments)
413 fTrackSegments->Clear() ;
414
415 if ( fTrackSegments && gAlice->TreeR() ) {
416 sprintf(branchname,"%sTS",GetName()) ;
417 gAlice->MakeBranchInTree(gAlice->TreeR(),branchname,&fTrackSegments,fBufferSize,file);
418 }
419
420 if(fRecParticles)
421 fRecParticles->Clear() ;
422
423 if ( fRecParticles && gAlice->TreeR() ) {
424 sprintf(branchname,"%sRP",GetName()) ;
425 gAlice->MakeBranchInTree(gAlice->TreeR(),branchname,&fRecParticles,fBufferSize,file);
426 }
427
428 }
429
430}
431
432//_____________________________________________________________________________
f444a19f 433void AliPHOSv1::Reconstruction(AliPHOSReconstructor * Reconstructioner)
b37750a6 434{
435 // 1. Reinitializes the existing RecPoint, TrackSegment, and RecParticles Lists and
436 // 2. Creates TreeR with a branch for each list
437 // 3. Steers the reconstruction processes
438 // 4. Saves the 3 lists in TreeR
439 // 5. Write the Tree to File
440
441 fReconstructioner = Reconstructioner ;
442
443 // 1.
444
445 // gAlice->MakeTree("R") ;
446
447 MakeBranch("R") ;
448
449 // 3.
450
451 fReconstructioner->Make(fDigits, fEmcRecPoints, fPpsdRecPoints, fTrackSegments, fRecParticles);
452
453 printf("Reconstruction: %d %d %d %d\n",
454 fEmcRecPoints->GetEntries(),fPpsdRecPoints->GetEntries(),
455 fTrackSegments->GetEntries(),fRecParticles->GetEntries());
456
457 // 4. Expand or Shrink the arrays to the proper size
458
459 Int_t size ;
460
461 size = fEmcRecPoints->GetEntries() ;
462 fEmcRecPoints->Expand(size) ;
463
464 size = fPpsdRecPoints->GetEntries() ;
465 fPpsdRecPoints->Expand(size) ;
466
467 size = fTrackSegments->GetEntries() ;
468 fTrackSegments->Expand(size) ;
469
470 size = fRecParticles->GetEntries() ;
471 fRecParticles->Expand(size) ;
472
473 gAlice->TreeR()->Fill() ;
474 // 5.
475
476 gAlice->TreeR()->Write(0,TObject::kOverwrite) ;
477
478 // Deleting reconstructed objects
479 ResetReconstruction();
480
481}
482
483//____________________________________________________________________________
484void AliPHOSv1::ResetReconstruction()
485{
486 // Deleting reconstructed objects
487
488 if ( fEmcRecPoints ) fEmcRecPoints ->Delete();
489 if ( fPpsdRecPoints ) fPpsdRecPoints->Delete();
490 if ( fTrackSegments ) fTrackSegments->Delete();
491 if ( fRecParticles ) fRecParticles ->Delete();
492
493}
494
495//____________________________________________________________________________
496
497void AliPHOSv1::StepManager(void)
498{
499 // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
500
501 Int_t relid[4] ; // (box, layer, row, column) indices
502 Int_t absid ; // absolute cell ID number
503 Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
504 TLorentzVector pos ; // Lorentz vector of the track current position
505 TLorentzVector pmom ; //momentum of the particle initiated hit
506 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
507 Bool_t entered = kFALSE ;
508 Int_t copy ;
509
642f15cf 510 Int_t tracknumber = gAlice->GetCurrentTrackNumber() ;
511 Int_t primary = gAlice->GetPrimary( gAlice->GetCurrentTrackNumber() );
fa7cce36 512 TString name = GetGeometry()->GetName() ;
b37750a6 513 Int_t trackpid = 0 ;
514
515 if( gMC->IsTrackEntering() ){ // create hit with position and momentum of new particle,
516 // but may be without energy deposition
517
518 // Current position of the hit in the local ref. system
519 gMC -> TrackPosition(pos);
520 Float_t xyzm[3], xyzd[3] ;
521 Int_t i;
522 for (i=0; i<3; i++) xyzm[i] = pos[i];
523 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
524 xyd[0] = xyzd[0];
525 xyd[1] =-xyzd[1];
526 xyd[2] =-xyzd[2];
527
528
529 // Current momentum of the hit's track in the local ref. system
530 gMC -> TrackMomentum(pmom);
531 Float_t pm[3], pd[3];
532 for (i=0; i<3; i++) pm[i] = pmom[i];
533 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
534 pmom[0] = pd[0];
535 pmom[1] =-pd[1];
536 pmom[2] =-pd[2];
537
538 trackpid = gMC->TrackPid();
539 entered = kTRUE ; // Mark to create hit even withou energy deposition
540
541 }
542
543
d6eed22f 544 if ( name == "IHEP" ) { // ======> CPV is a IHEP's one
b37750a6 545
546 // Yuri Kharlov, 28 September 2000
547
d6fb41ac 548 static Int_t idPCPQ = gMC->VolId("PCPQ");
549 if( gMC->CurrentVolID(copy) == idPCPQ &&
b37750a6 550 entered &&
551 gMC->TrackCharge() != 0) {
552
553 // Digitize the current CPV hit:
554
555 // 1. find pad response and
556
557 Int_t moduleNumber;
558 gMC->CurrentVolOffID(3,moduleNumber);
559 moduleNumber--;
560
561
562 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
563 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
564
565 Float_t xmean = 0;
566 Float_t zmean = 0;
567 Float_t qsum = 0;
568 Int_t idigit,ndigits;
569
570 // 2. go through the current digit list and sum digits in pads
571
572 ndigits = cpvDigits->GetEntriesFast();
573 for (idigit=0; idigit<ndigits-1; idigit++) {
574 AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
575 Float_t x1 = cpvDigit1->GetXpad() ;
576 Float_t z1 = cpvDigit1->GetYpad() ;
577 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
578 AliPHOSCPVDigit *cpvDigit2 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
579 Float_t x2 = cpvDigit2->GetXpad() ;
580 Float_t z2 = cpvDigit2->GetYpad() ;
581 if (x1==x2 && z1==z2) {
582 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
583 cpvDigit2->SetQpad(qsum) ;
584 cpvDigits->RemoveAt(idigit) ;
585 }
586 }
587 }
588 cpvDigits->Compress() ;
589
590 // 3. add digits to temporary hit list fTmpHits
591
592 ndigits = cpvDigits->GetEntriesFast();
593 for (idigit=0; idigit<ndigits; idigit++) {
594 AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
595 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
596 relid[1] =-1 ; // means CPV
597 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
598 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
599
600 // get the absolute Id number
fa7cce36 601 GetGeometry()->RelToAbsNumbering(relid, absid) ;
b37750a6 602
603 // add current digit to the temporary hit list
604 xyze[0] = 0. ;
605 xyze[1] = 0. ;
606 xyze[2] = 0. ;
607 xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
608 primary = -1; // No need in primary for CPV
609 AddHit(fIshunt, primary, tracknumber, absid, xyze, trackpid, pmom, xyd);
610
611 if (cpvDigit->GetQpad() > 0.02) {
612 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
613 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
614 qsum += cpvDigit->GetQpad();
615 }
616 }
617 delete cpvDigits;
618 }
619 } // end of IHEP configuration
620
621
622 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
623 gMC->TrackPosition(pos) ;
624 xyze[0] = pos[0] ;
625 xyze[1] = pos[1] ;
626 xyze[2] = pos[2] ;
627 xyze[3] = gMC->Edep() ;
628
629
630 if ( (xyze[3] != 0) || entered ) { // Track is inside the crystal and deposits some energy or just entered
631
632 gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
633
b37750a6 634 relid[1] = 0 ; // means PBW04
635 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
636 gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
637
638 // get the absolute Id number
fa7cce36 639 GetGeometry()->RelToAbsNumbering(relid, absid) ;
b37750a6 640
641 // add current hit to the hit list
642 AddHit(fIshunt, primary,tracknumber, absid, xyze, trackpid,pmom, xyd);
643
644
645 } // there is deposited energy
646 } // we are inside a PHOS Xtal
647
648
649}
650
651//____________________________________________________________________________
652void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
653{
654 // ------------------------------------------------------------------------
655 // Digitize one CPV hit:
656 // On input take exact 4-momentum p and position zxhit of the hit,
657 // find the pad response around this hit and
658 // put the amplitudes in the pads into array digits
659 //
660 // Author: Yuri Kharlov (after Serguei Sadovsky)
661 // 2 October 2000
662 // ------------------------------------------------------------------------
663
fa7cce36 664 const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
b37750a6 665 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
666 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
667 const Int_t kNgamz = 5; // Ionization size in Z
668 const Int_t kNgamx = 9; // Ionization size in Phi
669 const Float_t kNoise = 0.03; // charge noise in one pad
670
671 Float_t rnor1,rnor2;
672
673 // Just a reminder on axes notation in the CPV module:
674 // axis Z goes along the beam
675 // axis X goes across the beam in the module plane
676 // axis Y is a normal to the module plane showing from the IP
677
678 Float_t hitX = zxhit[0];
679 Float_t hitZ =-zxhit[1];
680 Float_t pX = p.Px();
681 Float_t pZ =-p.Pz();
682 Float_t pNorm = p.Py();
683 Float_t eloss = kdEdx;
684
fa7cce36 685 Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
686 Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
b37750a6 687 gRandom->Rannor(rnor1,rnor2);
688 eloss *= (1 + kDetR*rnor1) *
fa7cce36 689 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
690 Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
691 Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
b37750a6 692 Float_t zhit2 = zhit1 + dZY;
693 Float_t xhit2 = xhit1 + dXY;
694
695 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
696 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
697
698 Int_t nIter;
699 Float_t zxe[3][5];
700 if (iwht1==iwht2) { // incline 1-wire hit
701 nIter = 2;
702 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
703 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
704 zxe[2][0] = eloss/2;
705 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
706 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
707 zxe[2][1] = eloss/2;
708 }
709 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
710 nIter = 3;
711 Int_t iwht3 = (iwht1 + iwht2) / 2;
712 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
713 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
714 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
715 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
716 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
717 Float_t dxw1 = xhit1 - xwr13;
718 Float_t dxw2 = xhit2 - xwr23;
719 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
720 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
721 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
722 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
723 zxe[1][0] = xwht1;
724 zxe[2][0] = eloss * egm1;
725 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
726 zxe[1][1] = xwht2;
727 zxe[2][1] = eloss * egm2;
728 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
729 zxe[1][2] = xwht3;
730 zxe[2][2] = eloss * egm3;
731 }
732 else { // incline 2-wire hit
733 nIter = 2;
734 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
735 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
736 Float_t xwr12 = (xwht1 + xwht2) / 2;
737 Float_t dxw1 = xhit1 - xwr12;
738 Float_t dxw2 = xhit2 - xwr12;
739 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
740 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
741 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
742 zxe[1][0] = xwht1;
743 zxe[2][0] = eloss * egm1;
744 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
745 zxe[1][1] = xwht2;
746 zxe[2][1] = eloss * egm2;
747 }
748
749 // Finite size of ionization region
750
fa7cce36 751 Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
752 Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
b37750a6 753 Int_t nz3 = (kNgamz+1)/2;
754 Int_t nx3 = (kNgamx+1)/2;
755 cpvDigits->Expand(nIter*kNgamx*kNgamz);
756 TClonesArray &ldigits = *(TClonesArray *)cpvDigits;
757
758 for (Int_t iter=0; iter<nIter; iter++) {
759
760 Float_t zhit = zxe[0][iter];
761 Float_t xhit = zxe[1][iter];
762 Float_t qhit = zxe[2][iter];
fa7cce36 763 Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
764 Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
b37750a6 765 if ( zcell<=0 || xcell<=0 ||
766 zcell>=nCellZ || xcell>=nCellX) return;
767 Int_t izcell = (Int_t) zcell;
768 Int_t ixcell = (Int_t) xcell;
769 Float_t zc = zcell - izcell - 0.5;
770 Float_t xc = xcell - ixcell - 0.5;
771 for (Int_t iz=1; iz<=kNgamz; iz++) {
772 Int_t kzg = izcell + iz - nz3;
773 if (kzg<=0 || kzg>nCellZ) continue;
774 Float_t zg = (Float_t)(iz-nz3) - zc;
775 for (Int_t ix=1; ix<=kNgamx; ix++) {
776 Int_t kxg = ixcell + ix - nx3;
777 if (kxg<=0 || kxg>nCellX) continue;
778 Float_t xg = (Float_t)(ix-nx3) - xc;
779
780 // Now calculate pad response
781 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
782 qpad += kNoise*rnor2;
783 if (qpad<0) continue;
784
785 // Fill the array with pad response ID and amplitude
786 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
787 }
788 }
789 }
790}
791
792//____________________________________________________________________________
793Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
794 // ------------------------------------------------------------------------
795 // Calculate the amplitude in one CPV pad using the
796 // cumulative pad response function
797 // Author: Yuri Kharlov (after Serguei Sadovski)
798 // 3 October 2000
799 // ------------------------------------------------------------------------
800
fa7cce36 801 Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
802 Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
803 Double_t z = zhit * GetGeometry()->GetPadSizeZ();
804 Double_t x = xhit * GetGeometry()->GetPadSizePhi();
b37750a6 805 Double_t amplitude = qhit *
806 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
807 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
808 return (Float_t)amplitude;
809}
810
811//____________________________________________________________________________
812Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
813 // ------------------------------------------------------------------------
814 // Cumulative pad response function
815 // It includes several terms from the CF decomposition in electrostatics
816 // Note: this cumulative function is wrong since omits some terms
817 // but the cell amplitude obtained with it is correct because
818 // these omitting terms cancel
819 // Author: Yuri Kharlov (after Serguei Sadovski)
820 // 3 October 2000
821 // ------------------------------------------------------------------------
822
823 const Double_t kA=1.0;
824 const Double_t kB=0.7;
825
826 Double_t r2 = x*x + y*y;
827 Double_t xy = x*y;
828 Double_t cumulPRF = 0;
829 for (Int_t i=0; i<=4; i++) {
830 Double_t b1 = (2*i + 1) * kB;
831 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
832 }
833 cumulPRF *= kA/(2*TMath::Pi());
834 return cumulPRF;
835}
836