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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/* History of cvs commits:
19 *
20 * $Log$
21 * Revision 1.111 2007/07/24 09:41:19 morsch
22 * AliStack included for kKeepBit.
23 *
24 * Revision 1.110 2007/03/10 08:58:52 kharlov
25 * Protection for noCPV geometry
26 *
27 * Revision 1.109 2007/03/01 11:37:37 kharlov
28 * Strip units changed from 8x1 to 8x2 (T.Pocheptsov)
29 *
30 * Revision 1.108 2007/02/02 09:40:50 alibrary
31 * Includes required by ROOT head
32 *
33 * Revision 1.107 2007/02/01 10:34:47 hristov
34 * Removing warnings on Solaris x86
35 *
36 * Revision 1.106 2006/11/14 17:11:15 hristov
37 * Removing inheritances from TAttLine, TAttMarker and AliRndm in AliModule. The copy constructor and assignment operators are moved to the private part of the class and not implemented. The corresponding changes are propagated to the detectors
38 *
39 * Revision 1.105 2006/09/13 07:31:01 kharlov
40 * Effective C++ corrections (T.Pocheptsov)
41 *
42 * Revision 1.104 2005/05/28 14:19:05 schutz
43 * Compilation warnings fixed by T.P.
44 *
45 */
46
47//_________________________________________________________________________
48// Implementation version v1 of PHOS Manager class
49//---
50//---
51// Layout EMC + CPV has name IHEP:
52// Produces hits for CPV, cumulated hits
53//---
54//---
55//*-- Author: Yves Schutz (SUBATECH)
56
57
58// --- ROOT system ---
59#include <TClonesArray.h>
60#include <TParticle.h>
61#include <TVirtualMC.h>
62
63// --- Standard library ---
64
65
66// --- AliRoot header files ---
67#include "AliPHOSCPVDigit.h"
68#include "AliPHOSGeometry.h"
69#include "AliPHOSHit.h"
70#include "AliPHOSv1.h"
71#include "AliRun.h"
72#include "AliMC.h"
73#include "AliStack.h"
74#include "AliPHOSSimParam.h"
75
76ClassImp(AliPHOSv1)
77
78//____________________________________________________________________________
79AliPHOSv1::AliPHOSv1() : fCPVDigits("AliPHOSCPVDigit",20)
80{
81 //Def ctor.
82}
83
84//____________________________________________________________________________
85AliPHOSv1::AliPHOSv1(const char *name, const char *title):
86 AliPHOSv0(name,title), fCPVDigits("AliPHOSCPVDigit",20)
87{
88 //
89 // We store hits :
90 // - fHits (the "normal" one), which retains the hits associated with
91 // the current primary particle being tracked
92 // (this array is reset after each primary has been tracked).
93 //
94
95
96
97 // We do not want to save in TreeH the raw hits
98 // But save the cumulated hits instead (need to create the branch myself)
99 // It is put in the Digit Tree because the TreeH is filled after each primary
100 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
101
102 fHits= new TClonesArray("AliPHOSHit",1000) ;
103// fCPVDigits("AliPHOSCPVDigit",20);
104 gAlice->GetMCApp()->AddHitList(fHits) ;
105
106 fNhits = 0 ;
107
108 fIshunt = 2 ; // All hits are associated with primary particles
109}
110
111//____________________________________________________________________________
112AliPHOSv1::~AliPHOSv1()
113{
114 // dtor
115 if ( fHits) {
116 fHits->Delete() ;
117 delete fHits ;
118 fHits = 0 ;
119 }
120}
121
122//____________________________________________________________________________
123void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t Id, Float_t * hits)
124{
125 // Add a hit to the hit list.
126 // A PHOS hit is the sum of all hits in a single crystal from one primary and within some time gate
127
128 Int_t hitCounter ;
129 AliPHOSHit *newHit ;
130 AliPHOSHit *curHit ;
131 Bool_t deja = kFALSE ;
132 AliPHOSGeometry * geom = GetGeometry() ;
133
134 newHit = new AliPHOSHit(shunt, primary, Id, hits) ;
135
136 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
137 curHit = dynamic_cast<AliPHOSHit*>((*fHits)[hitCounter]) ;
138 if(curHit->GetPrimary() != primary) break ;
139 // We add hits with the same primary, while GEANT treats primaries succesively
140 if( *curHit == *newHit ) {
141 *curHit + *newHit ;
142 deja = kTRUE ;
143 }
144 }
145
146 if ( !deja ) {
147 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
148 // get the block Id number
149 Int_t relid[4] ;
150 geom->AbsToRelNumbering(Id, relid) ;
151
152 fNhits++ ;
153 }
154
155 delete newHit;
156}
157
158//____________________________________________________________________________
159void AliPHOSv1::FinishPrimary()
160{
161 // called at the end of each track (primary) by AliRun
162 // hits are reset for each new track
163 // accumulate the total hit-multiplicity
164
165}
166
167//____________________________________________________________________________
168void AliPHOSv1::FinishEvent()
169{
170 // called at the end of each event by AliRun
171 // accumulate the hit-multiplicity and total energy per block
172 // if the values have been updated check it
173
174 AliDetector::FinishEvent();
175}
176//____________________________________________________________________________
177void AliPHOSv1::StepManager(void)
178{
179 // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell
180
181 Int_t relid[4] ; // (box, layer, row, column) indices
182 Int_t absid ; // absolute cell ID number
183 Float_t xyzte[5]={-1000.,-1000.,-1000.,0.,0.} ; // position wrt MRS, time and energy deposited
184 TLorentzVector pos ; // Lorentz vector of the track current position
185 Int_t copy ;
186
187 Int_t moduleNumber ;
188
189 static Int_t idPCPQ = -1;
190 if (strstr(fTitle.Data(),"noCPV") == 0)
191 idPCPQ = gMC->VolId("PCPQ");
192
193 if( gMC->CurrentVolID(copy) == idPCPQ &&
194 (gMC->IsTrackEntering() ) &&
195 gMC->TrackCharge() != 0) {
196
197 gMC -> TrackPosition(pos);
198
199 Float_t xyzm[3], xyzd[3] ;
200 Int_t i;
201 for (i=0; i<3; i++) xyzm[i] = pos[i];
202 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
203
204
205 Float_t xyd[3]={0,0,0} ; //local position of the entering
206 xyd[0] = xyzd[0];
207 xyd[1] =-xyzd[2];
208 xyd[2] =-xyzd[1];
209
210 // Current momentum of the hit's track in the local ref. system
211 TLorentzVector pmom ; //momentum of the particle initiated hit
212 gMC -> TrackMomentum(pmom);
213 Float_t pm[3], pd[3];
214 for (i=0; i<3; i++)
215 pm[i] = pmom[i];
216
217 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
218 pmom[0] = pd[0];
219 pmom[1] =-pd[1];
220 pmom[2] =-pd[2];
221
222 // Digitize the current CPV hit:
223
224 // 1. find pad response and
225 gMC->CurrentVolOffID(3,moduleNumber);
226 moduleNumber--;
227
228// TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
229 CPVDigitize(pmom,xyd,&fCPVDigits);
230
231 Float_t xmean = 0;
232 Float_t zmean = 0;
233 Float_t qsum = 0;
234 Int_t idigit,ndigits;
235
236 // 2. go through the current digit list and sum digits in pads
237
238 ndigits = fCPVDigits.GetEntriesFast();
239 for (idigit=0; idigit<ndigits-1; idigit++) {
240 AliPHOSCPVDigit *cpvDigit1 = dynamic_cast<AliPHOSCPVDigit*>(fCPVDigits.UncheckedAt(idigit));
241 Float_t x1 = cpvDigit1->GetXpad() ;
242 Float_t z1 = cpvDigit1->GetYpad() ;
243 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
244 AliPHOSCPVDigit *cpvDigit2 = dynamic_cast<AliPHOSCPVDigit*>(fCPVDigits.UncheckedAt(jdigit));
245 Float_t x2 = cpvDigit2->GetXpad() ;
246 Float_t z2 = cpvDigit2->GetYpad() ;
247 if (x1==x2 && z1==z2) {
248 Float_t qsumpad = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
249 cpvDigit2->SetQpad(qsumpad) ;
250 fCPVDigits.RemoveAt(idigit) ;
251 }
252 }
253 }
254 fCPVDigits.Compress() ;
255
256 // 3. add digits to temporary hit list fTmpHits
257
258 ndigits = fCPVDigits.GetEntriesFast();
259 for (idigit=0; idigit<ndigits; idigit++) {
260 AliPHOSCPVDigit *cpvDigit = dynamic_cast<AliPHOSCPVDigit*>(fCPVDigits.UncheckedAt(idigit));
261 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
262 relid[1] =-1 ; // means CPV
263 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
264 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
265
266 // get the absolute Id number
267 GetGeometry()->RelToAbsNumbering(relid, absid) ;
268
269 // add current digit to the temporary hit list
270
271 xyzte[3] = gMC->TrackTime() ;
272 xyzte[4] = cpvDigit->GetQpad() ; // amplitude in a pad
273
274 Int_t primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() );
275 AddHit(fIshunt, primary, absid, xyzte);
276
277 if (cpvDigit->GetQpad() > 0.02) {
278 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
279 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
280 qsum += cpvDigit->GetQpad();
281 }
282 }
283 fCPVDigits.Clear();
284 }
285
286
287 static Int_t idPXTL = gMC->VolId("PXTL");
288 if(gMC->CurrentVolID(copy) == idPXTL ) { // We are inside a PBWO crystal
289
290 gMC->TrackPosition(pos) ;
291 xyzte[0] = pos[0] ;
292 xyzte[1] = pos[1] ;
293 xyzte[2] = pos[2] ;
294
295 Float_t lostenergy = gMC->Edep();
296
297 //Put in the TreeK particle entering PHOS and all its parents
298 if ( gMC->IsTrackEntering() ){
299 Float_t xyzd[3] ;
300 gMC -> Gmtod (xyzte, xyzd, 1); // transform coordinate from master to daughter system
301 if (xyzd[1] < -GetGeometry()->GetCrystalSize(1)/2.+0.1){ //Entered close to forward surface
302 Int_t parent = gAlice->GetMCApp()->GetCurrentTrackNumber() ;
303 TParticle * part = gAlice->GetMCApp()->Particle(parent) ;
304 Float_t vert[3],vertd[3] ;
305 vert[0]=part->Vx() ;
306 vert[1]=part->Vy() ;
307 vert[2]=part->Vz() ;
308 gMC -> Gmtod (vert, vertd, 1); // transform coordinate from master to daughter system
309 if(vertd[1]<-GetGeometry()->GetCrystalSize(1)/2.-0.1){ //Particle is created in foront of PHOS
310 //0.1 to get rid of numerical errors
311 part->SetBit(kKeepBit);
312 while ( parent != -1 ) {
313 part = gAlice->GetMCApp()->Particle(parent) ;
314 part->SetBit(kKeepBit);
315 parent = part->GetFirstMother() ;
316 }
317 }
318 }
319 }
320 if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy
321 xyzte[3] = gMC->TrackTime() ;
322
323 gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ;
324
325 Int_t strip ;
326 gMC->CurrentVolOffID(3, strip);
327 Int_t cell ;
328 gMC->CurrentVolOffID(2, cell);
329
330 //Old formula for row is wrong. For example, I have strip 56 (28 for 2 x 8), row must be 1.
331 //But row == 1 + 56 - 56 % 56 == 57 (row == 1 + 28 - 28 % 28 == 29)
332 //Int_t row = 1 + GetGeometry()->GetEMCAGeometry()->GetNStripZ() - strip % (GetGeometry()->GetEMCAGeometry()->GetNStripZ()) ;
333 Int_t row = GetGeometry()->GetEMCAGeometry()->GetNStripZ() - (strip - 1) % (GetGeometry()->GetEMCAGeometry()->GetNStripZ()) ;
334 Int_t col = (Int_t) TMath::Ceil((Double_t) strip/(GetGeometry()->GetEMCAGeometry()->GetNStripZ())) -1 ;
335
336 // Absid for 8x2-strips. Looks nice :)
337 absid = (moduleNumber-1)*GetGeometry()->GetNCristalsInModule() +
338 row * 2 + (col*GetGeometry()->GetEMCAGeometry()->GetNCellsXInStrip() + (cell - 1) / 2)*GetGeometry()->GetNZ() - (cell & 1 ? 1 : 0);
339
340
341 //Calculates the light yield, the number of photons produced in the
342 //crystal
343 //There is no dependence of reponce on distance from energy deposition to APD
344 Float_t lightYield = gRandom->Poisson(AliPHOSSimParam::GetInstance()->GetLightFactor() * lostenergy) ;
345
346 //Calculates de energy deposited in the crystal
347 xyzte[4] = AliPHOSSimParam::GetInstance()->GetAPDFactor() * lightYield ;
348
349 Int_t primary ;
350 if(fIshunt == 2){
351 primary = gAlice->GetMCApp()->GetCurrentTrackNumber() ;
352 TParticle * part = gAlice->GetMCApp()->Particle(primary) ;
353 while ( !part->TestBit(kKeepBit) ) {
354 primary = part->GetFirstMother() ;
355 if(primary == -1){
356 primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() );
357 break ; //there is a possibility that particle passed e.g. thermal isulator and hits a side
358 //surface of the crystal. In this case it may have no primary at all.
359 //We can not easily separate this case from the case when this is part of the shower,
360 //developed in the neighboring crystal.
361 }
362 part = gAlice->GetMCApp()->Particle(primary) ;
363 }
364 }
365 else{
366 primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() );
367 }
368
369 // add current hit to the hit list
370 // Info("StepManager","%d %d", primary, tracknumber) ;
371 AddHit(fIshunt, primary, absid, xyzte);
372
373 } // there is deposited energy
374 } // we are inside a PHOS Xtal
375
376}
377
378//____________________________________________________________________________
379void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, TClonesArray *cpvDigits)
380{
381 // ------------------------------------------------------------------------
382 // Digitize one CPV hit:
383 // On input take exact 4-momentum p and position zxhit of the hit,
384 // find the pad response around this hit and
385 // put the amplitudes in the pads into array digits
386 //
387 // Author: Yuri Kharlov (after Serguei Sadovsky)
388 // 2 October 2000
389 // ------------------------------------------------------------------------
390
391 const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
392 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
393 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
394 const Int_t kNgamz = 5; // Ionization size in Z
395 const Int_t kNgamx = 9; // Ionization size in Phi
396 const Float_t kNoise = 0.03; // charge noise in one pad
397
398 Float_t rnor1,rnor2;
399
400 // Just a reminder on axes notation in the CPV module:
401 // axis Z goes along the beam
402 // axis X goes across the beam in the module plane
403 // axis Y is a normal to the module plane showing from the IP
404
405 Float_t hitX = zxhit[0];
406 Float_t hitZ =-zxhit[1];
407 Float_t pX = p.Px();
408 Float_t pZ =-p.Pz();
409 Float_t pNorm = p.Py();
410 Float_t eloss = kdEdx;
411
412 Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
413 Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
414 gRandom->Rannor(rnor1,rnor2);
415 eloss *= (1 + kDetR*rnor1) *
416 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
417 Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
418 Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
419 Float_t zhit2 = zhit1 + dZY;
420 Float_t xhit2 = xhit1 + dXY;
421
422 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
423 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
424
425 Int_t nIter;
426 Float_t zxe[3][5];
427 if (iwht1==iwht2) { // incline 1-wire hit
428 nIter = 2;
429 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
430 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
431 zxe[2][0] = eloss/2;
432 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
433 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
434 zxe[2][1] = eloss/2;
435 }
436 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
437 nIter = 3;
438 Int_t iwht3 = (iwht1 + iwht2) / 2;
439 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
440 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
441 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
442 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
443 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
444 Float_t dxw1 = xhit1 - xwr13;
445 Float_t dxw2 = xhit2 - xwr23;
446 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
447 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
448 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
449 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
450 zxe[1][0] = xwht1;
451 zxe[2][0] = eloss * egm1;
452 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
453 zxe[1][1] = xwht2;
454 zxe[2][1] = eloss * egm2;
455 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
456 zxe[1][2] = xwht3;
457 zxe[2][2] = eloss * egm3;
458 }
459 else { // incline 2-wire hit
460 nIter = 2;
461 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
462 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
463 Float_t xwr12 = (xwht1 + xwht2) / 2;
464 Float_t dxw1 = xhit1 - xwr12;
465 Float_t dxw2 = xhit2 - xwr12;
466 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
467 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
468 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
469 zxe[1][0] = xwht1;
470 zxe[2][0] = eloss * egm1;
471 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
472 zxe[1][1] = xwht2;
473 zxe[2][1] = eloss * egm2;
474 }
475
476 // Finite size of ionization region
477
478 Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
479 Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
480 Int_t nz3 = (kNgamz+1)/2;
481 Int_t nx3 = (kNgamx+1)/2;
482 cpvDigits->Expand(nIter*kNgamx*kNgamz);
483 TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits));
484
485 for (Int_t iter=0; iter<nIter; iter++) {
486
487 Float_t zhit = zxe[0][iter];
488 Float_t xhit = zxe[1][iter];
489 Float_t qhit = zxe[2][iter];
490 Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
491 Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
492 if ( zcell<=0 || xcell<=0 ||
493 zcell>=nCellZ || xcell>=nCellX) return;
494 Int_t izcell = (Int_t) zcell;
495 Int_t ixcell = (Int_t) xcell;
496 Float_t zc = zcell - izcell - 0.5;
497 Float_t xc = xcell - ixcell - 0.5;
498 for (Int_t iz=1; iz<=kNgamz; iz++) {
499 Int_t kzg = izcell + iz - nz3;
500 if (kzg<=0 || kzg>nCellZ) continue;
501 Float_t zg = (Float_t)(iz-nz3) - zc;
502 for (Int_t ix=1; ix<=kNgamx; ix++) {
503 Int_t kxg = ixcell + ix - nx3;
504 if (kxg<=0 || kxg>nCellX) continue;
505 Float_t xg = (Float_t)(ix-nx3) - xc;
506
507 // Now calculate pad response
508 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
509 qpad += kNoise*rnor2;
510 if (qpad<0) continue;
511
512 // Fill the array with pad response ID and amplitude
513 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
514 }
515 }
516 }
517}
518
519//____________________________________________________________________________
520Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
521 // ------------------------------------------------------------------------
522 // Calculate the amplitude in one CPV pad using the
523 // cumulative pad response function
524 // Author: Yuri Kharlov (after Serguei Sadovski)
525 // 3 October 2000
526 // ------------------------------------------------------------------------
527
528 Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
529 Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
530 Double_t z = zhit * GetGeometry()->GetPadSizeZ();
531 Double_t x = xhit * GetGeometry()->GetPadSizePhi();
532 Double_t amplitude = qhit *
533 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
534 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
535 return (Float_t)amplitude;
536}
537
538//____________________________________________________________________________
539Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
540 // ------------------------------------------------------------------------
541 // Cumulative pad response function
542 // It includes several terms from the CF decomposition in electrostatics
543 // Note: this cumulative function is wrong since omits some terms
544 // but the cell amplitude obtained with it is correct because
545 // these omitting terms cancel
546 // Author: Yuri Kharlov (after Serguei Sadovski)
547 // 3 October 2000
548 // ------------------------------------------------------------------------
549
550 const Double_t kA=1.0;
551 const Double_t kB=0.7;
552
553 Double_t r2 = x*x + y*y;
554 Double_t xy = x*y;
555 Double_t cumulPRF = 0;
556 for (Int_t i=0; i<=4; i++) {
557 Double_t b1 = (2*i + 1) * kB;
558 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
559 }
560 cumulPRF *= kA/(2*TMath::Pi());
561 return cumulPRF;
562}
563