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[u/mrichter/AliRoot.git] / PHOS / AliPHOSv1.cxx
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7587f5a5 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
b2a60966 16/* $Id$ */
5f20d3fb 17
7587f5a5 18//_________________________________________________________________________
5f20d3fb 19// Implementation version v1 of PHOS Manager class
a3dfe79c 20//---
21// Layout EMC + PPSD has name GPS2:
ed4205d8 22// Produces cumulated hits
a3dfe79c 23//---
24// Layout EMC + CPV has name IHEP:
ed4205d8 25// Produces hits for CPV, cumulated hits
26//---
27// Layout EMC + CPV + PPSD has name GPS:
28// Produces hits for CPV, cumulated hits
29//---
5f20d3fb 30//*-- Author: Yves Schutz (SUBATECH)
b2a60966 31
7587f5a5 32
33// --- ROOT system ---
bea63bea 34
35#include "TBRIK.h"
36#include "TNode.h"
7587f5a5 37#include "TRandom.h"
94de3818 38#include "TTree.h"
7587f5a5 39
5f20d3fb 40
7587f5a5 41// --- Standard library ---
42
de9ec31b 43#include <stdio.h>
44#include <string.h>
45#include <stdlib.h>
46#include <strstream.h>
7587f5a5 47
48// --- AliRoot header files ---
49
50#include "AliPHOSv1.h"
51#include "AliPHOSHit.h"
97cee223 52#include "AliPHOSCPVDigit.h"
7587f5a5 53#include "AliRun.h"
54#include "AliConst.h"
94de3818 55#include "AliMC.h"
97cee223 56#include "AliPHOSGeometry.h"
7587f5a5 57
58ClassImp(AliPHOSv1)
59
bea63bea 60//____________________________________________________________________________
02ab1add 61AliPHOSv1::AliPHOSv1():
62AliPHOSv0()
bea63bea 63{
5f20d3fb 64 // ctor
ed4205d8 65
bea63bea 66}
67
7587f5a5 68//____________________________________________________________________________
69AliPHOSv1::AliPHOSv1(const char *name, const char *title):
e04976bd 70AliPHOSv0(name,title)
7587f5a5 71{
5f20d3fb 72 // ctor : title is used to identify the layout
fa412d9b 73 // GPS2 = 5 modules (EMC + PPSD)
74 // IHEP = 5 modules (EMC + CPV )
ed4205d8 75 // MIXT = 4 modules (EMC + CPV ) and 1 module (EMC + PPSD)
5f20d3fb 76 //
ed4205d8 77 // We store hits :
5f20d3fb 78 // - fHits (the "normal" one), which retains the hits associated with
79 // the current primary particle being tracked
80 // (this array is reset after each primary has been tracked).
81 //
fa412d9b 82
037cc66d 83
5f20d3fb 84
85 // We do not want to save in TreeH the raw hits
86 // But save the cumulated hits instead (need to create the branch myself)
87 // It is put in the Digit Tree because the TreeH is filled after each primary
fa412d9b 88 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
5f20d3fb 89
ed4205d8 90 fHits= new TClonesArray("AliPHOSHit",1000) ;
5f20d3fb 91
ed4205d8 92 fNhits = 0 ;
5f20d3fb 93
5f20d3fb 94 fIshunt = 1 ; // All hits are associated with primary particles
fa412d9b 95
5f20d3fb 96}
97
7587f5a5 98//____________________________________________________________________________
bea63bea 99AliPHOSv1::~AliPHOSv1()
b2a60966 100{
bea63bea 101 // dtor
5f20d3fb 102
ed4205d8 103 if ( fHits) {
104 fHits->Delete() ;
105 delete fHits ;
106 fHits = 0 ;
8dfa469d 107 }
7587f5a5 108}
109
7587f5a5 110//____________________________________________________________________________
b37750a6 111void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits)
bea63bea 112{
113 // Add a hit to the hit list.
5f20d3fb 114 // A PHOS hit is the sum of all hits in a single crystal
115 // or in a single PPSD gas cell
bea63bea 116
5f20d3fb 117 Int_t hitCounter ;
bea63bea 118 AliPHOSHit *newHit ;
5f20d3fb 119 AliPHOSHit *curHit ;
120 Bool_t deja = kFALSE ;
bea63bea 121
b37750a6 122 newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ;
bea63bea 123
7854a24a 124 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
ed4205d8 125 curHit = (AliPHOSHit*) (*fHits)[hitCounter] ;
b37750a6 126 if(curHit->GetPrimary() != primary) break ; // We add hits with the same primary, while GEANT treats primaries consequently
ed4205d8 127 if( *curHit == *newHit ) {
128 *curHit = *curHit + *newHit ;
129 deja = kTRUE ;
5f20d3fb 130 }
131 }
132
133 if ( !deja ) {
ed4205d8 134 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
135 fNhits++ ;
5f20d3fb 136 }
137
bea63bea 138 delete newHit;
bea63bea 139}
140
5f20d3fb 141//____________________________________________________________________________
7587f5a5 142void AliPHOSv1::StepManager(void)
143{
b2a60966 144 // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
b2a60966 145
4f5bbbd4 146 Int_t relid[4] ; // (box, layer, row, column) indices
147 Int_t absid ; // absolute cell ID number
2168f43b 148 Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
4f5bbbd4 149 TLorentzVector pos ; // Lorentz vector of the track current position
fa412d9b 150 Int_t copy ;
7587f5a5 151
bea63bea 152 Int_t tracknumber = gAlice->CurrentTrack() ;
fa412d9b 153 Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
154 TString name = fGeom->GetName() ;
037cc66d 155
156
ed4205d8 157 if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD
fa412d9b 158
97cee223 159 if( gMC->CurrentVolID(copy) == gMC->VolId("PCEL") ) // We are inside a gas cell
7587f5a5 160 {
161 gMC->TrackPosition(pos) ;
162 xyze[0] = pos[0] ;
163 xyze[1] = pos[1] ;
164 xyze[2] = pos[2] ;
bea63bea 165 xyze[3] = gMC->Edep() ;
7587f5a5 166
b37750a6 167 if ( xyze[3] != 0 ) { // there is deposited energy
7587f5a5 168 gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number
fad3e5b9 169 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){
ed4205d8 170 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
fad3e5b9 171 }
7587f5a5 172 gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
ed4205d8 173 // 1-> fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper
174 // > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower
7587f5a5 175 gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell
176 gMC->CurrentVolID(relid[3]) ; // get the column number
177
178 // get the absolute Id number
179
bea63bea 180 fGeom->RelToAbsNumbering(relid, absid) ;
7587f5a5 181
bea63bea 182 // add current hit to the hit list
b37750a6 183 AddHit(fIshunt, primary, tracknumber, absid, xyze);
037cc66d 184
7587f5a5 185
186 } // there is deposited energy
fa412d9b 187 } // We are inside the gas of the CPV
188 } // GPS2 configuration
189
ed4205d8 190 if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one
fa412d9b 191
192 // Yuri Kharlov, 28 September 2000
193
97cee223 194 if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") &&
b37750a6 195 (gMC->IsTrackEntering() ) &&
037cc66d 196 gMC->TrackCharge() != 0) {
fa412d9b 197
b37750a6 198 gMC -> TrackPosition(pos);
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 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
205 xyd[0] = xyzd[0];
206 xyd[1] =-xyzd[1];
207 xyd[2] =-xyzd[2];
208
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++) pm[i] = pmom[i];
215 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
216 pmom[0] = pd[0];
217 pmom[1] =-pd[1];
218 pmom[2] =-pd[2];
219
037cc66d 220 // Digitize the current CPV hit:
221
222 // 1. find pad response and
fa412d9b 223
a3dfe79c 224 Int_t moduleNumber;
225 gMC->CurrentVolOffID(3,moduleNumber);
226 moduleNumber--;
fa412d9b 227
fa412d9b 228
3d402178 229 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
a3dfe79c 230 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
fa412d9b 231
232 Float_t xmean = 0;
233 Float_t zmean = 0;
234 Float_t qsum = 0;
cd461ab8 235 Int_t idigit,ndigits;
fa412d9b 236
237 // 2. go through the current digit list and sum digits in pads
238
239 ndigits = cpvDigits->GetEntriesFast();
cd461ab8 240 for (idigit=0; idigit<ndigits-1; idigit++) {
3d402178 241 AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
fa412d9b 242 Float_t x1 = cpvDigit1->GetXpad() ;
243 Float_t z1 = cpvDigit1->GetYpad() ;
244 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
3d402178 245 AliPHOSCPVDigit *cpvDigit2 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
fa412d9b 246 Float_t x2 = cpvDigit2->GetXpad() ;
247 Float_t z2 = cpvDigit2->GetYpad() ;
248 if (x1==x2 && z1==z2) {
249 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
250 cpvDigit2->SetQpad(qsum) ;
251 cpvDigits->RemoveAt(idigit) ;
252 }
253 }
254 }
255 cpvDigits->Compress() ;
256
257 // 3. add digits to temporary hit list fTmpHits
258
259 ndigits = cpvDigits->GetEntriesFast();
cd461ab8 260 for (idigit=0; idigit<ndigits; idigit++) {
3d402178 261 AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
a3dfe79c 262 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
fa412d9b 263 relid[1] =-1 ; // means CPV
264 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
265 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
266
267 // get the absolute Id number
268 fGeom->RelToAbsNumbering(relid, absid) ;
269
270 // add current digit to the temporary hit list
271 xyze[0] = 0. ;
272 xyze[1] = 0. ;
273 xyze[2] = 0. ;
274 xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
275 primary = -1; // No need in primary for CPV
b37750a6 276 AddHit(fIshunt, primary, tracknumber, absid, xyze);
fa412d9b 277
278 if (cpvDigit->GetQpad() > 0.02) {
279 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
280 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
281 qsum += cpvDigit->GetQpad();
282 }
283 }
284 delete cpvDigits;
285 }
286 } // end of IHEP configuration
7587f5a5 287
037cc66d 288
fa412d9b 289 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
290 gMC->TrackPosition(pos) ;
291 xyze[0] = pos[0] ;
292 xyze[1] = pos[1] ;
293 xyze[2] = pos[2] ;
294 xyze[3] = gMC->Edep() ;
ed4205d8 295
037cc66d 296
b37750a6 297 if ( xyze[3] != 0 ) { // Track is inside the crystal and deposits some energy
ed4205d8 298
fa412d9b 299 gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
037cc66d 300
fad3e5b9 301 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 )
302 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
303
fa412d9b 304 relid[1] = 0 ; // means PBW04
305 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
306 gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
307
308 // get the absolute Id number
fa412d9b 309 fGeom->RelToAbsNumbering(relid, absid) ;
ed4205d8 310
fa412d9b 311 // add current hit to the hit list
b37750a6 312 AddHit(fIshunt, primary,tracknumber, absid, xyze);
037cc66d 313
ed4205d8 314
fa412d9b 315 } // there is deposited energy
316 } // we are inside a PHOS Xtal
317}
318
319//____________________________________________________________________________
320void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
321{
322 // ------------------------------------------------------------------------
323 // Digitize one CPV hit:
324 // On input take exact 4-momentum p and position zxhit of the hit,
325 // find the pad response around this hit and
326 // put the amplitudes in the pads into array digits
327 //
328 // Author: Yuri Kharlov (after Serguei Sadovsky)
329 // 2 October 2000
330 // ------------------------------------------------------------------------
331
a3dfe79c 332 const Float_t kCelWr = fGeom->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
333 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
334 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
335 const Int_t kNgamz = 5; // Ionization size in Z
336 const Int_t kNgamx = 9; // Ionization size in Phi
337 const Float_t kNoise = 0.03; // charge noise in one pad
fa412d9b 338
339 Float_t rnor1,rnor2;
340
341 // Just a reminder on axes notation in the CPV module:
342 // axis Z goes along the beam
343 // axis X goes across the beam in the module plane
344 // axis Y is a normal to the module plane showing from the IP
345
346 Float_t hitX = zxhit[0];
347 Float_t hitZ =-zxhit[1];
348 Float_t pX = p.Px();
349 Float_t pZ =-p.Pz();
350 Float_t pNorm = p.Py();
a3dfe79c 351 Float_t eloss = kdEdx;
3d402178 352
7eb9d12d 353// cout << "CPVDigitize: YVK : "<<hitX<<" "<<hitZ<<" | "<<pX<<" "<<pZ<<" "<<pNorm<<endl;
354
fa412d9b 355 Float_t dZY = pZ/pNorm * fGeom->GetCPVGasThickness();
356 Float_t dXY = pX/pNorm * fGeom->GetCPVGasThickness();
357 gRandom->Rannor(rnor1,rnor2);
a3dfe79c 358 eloss *= (1 + kDetR*rnor1) *
359 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(fGeom->GetCPVGasThickness(),2)));
fa412d9b 360 Float_t zhit1 = hitZ + fGeom->GetCPVActiveSize(1)/2 - dZY/2;
361 Float_t xhit1 = hitX + fGeom->GetCPVActiveSize(0)/2 - dXY/2;
362 Float_t zhit2 = zhit1 + dZY;
363 Float_t xhit2 = xhit1 + dXY;
364
a3dfe79c 365 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
366 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
fa412d9b 367
368 Int_t nIter;
369 Float_t zxe[3][5];
370 if (iwht1==iwht2) { // incline 1-wire hit
371 nIter = 2;
372 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
a3dfe79c 373 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
374 zxe[2][0] = eloss/2;
fa412d9b 375 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
a3dfe79c 376 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
377 zxe[2][1] = eloss/2;
fa412d9b 378 }
379 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
380 nIter = 3;
381 Int_t iwht3 = (iwht1 + iwht2) / 2;
a3dfe79c 382 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
383 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
384 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
fa412d9b 385 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
386 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
387 Float_t dxw1 = xhit1 - xwr13;
388 Float_t dxw2 = xhit2 - xwr23;
a3dfe79c 389 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
390 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
391 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
fa412d9b 392 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
393 zxe[1][0] = xwht1;
a3dfe79c 394 zxe[2][0] = eloss * egm1;
fa412d9b 395 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
396 zxe[1][1] = xwht2;
a3dfe79c 397 zxe[2][1] = eloss * egm2;
fa412d9b 398 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
399 zxe[1][2] = xwht3;
a3dfe79c 400 zxe[2][2] = eloss * egm3;
fa412d9b 401 }
402 else { // incline 2-wire hit
403 nIter = 2;
a3dfe79c 404 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
405 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
fa412d9b 406 Float_t xwr12 = (xwht1 + xwht2) / 2;
407 Float_t dxw1 = xhit1 - xwr12;
408 Float_t dxw2 = xhit2 - xwr12;
409 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
410 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
411 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
412 zxe[1][0] = xwht1;
a3dfe79c 413 zxe[2][0] = eloss * egm1;
fa412d9b 414 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
415 zxe[1][1] = xwht2;
a3dfe79c 416 zxe[2][1] = eloss * egm2;
fa412d9b 417 }
bea63bea 418
fa412d9b 419 // Finite size of ionization region
420
ed4205d8 421 Int_t nCellZ = fGeom->GetNumberOfCPVPadsZ();
422 Int_t nCellX = fGeom->GetNumberOfCPVPadsPhi();
a3dfe79c 423 Int_t nz3 = (kNgamz+1)/2;
424 Int_t nx3 = (kNgamx+1)/2;
425 cpvDigits->Expand(nIter*kNgamx*kNgamz);
fa412d9b 426 TClonesArray &ldigits = *(TClonesArray *)cpvDigits;
427
428 for (Int_t iter=0; iter<nIter; iter++) {
429
430 Float_t zhit = zxe[0][iter];
431 Float_t xhit = zxe[1][iter];
432 Float_t qhit = zxe[2][iter];
433 Float_t zcell = zhit / fGeom->GetPadSizeZ();
434 Float_t xcell = xhit / fGeom->GetPadSizePhi();
435 if ( zcell<=0 || xcell<=0 ||
436 zcell>=nCellZ || xcell>=nCellX) return;
437 Int_t izcell = (Int_t) zcell;
438 Int_t ixcell = (Int_t) xcell;
439 Float_t zc = zcell - izcell - 0.5;
440 Float_t xc = xcell - ixcell - 0.5;
a3dfe79c 441 for (Int_t iz=1; iz<=kNgamz; iz++) {
fa412d9b 442 Int_t kzg = izcell + iz - nz3;
443 if (kzg<=0 || kzg>nCellZ) continue;
444 Float_t zg = (Float_t)(iz-nz3) - zc;
a3dfe79c 445 for (Int_t ix=1; ix<=kNgamx; ix++) {
fa412d9b 446 Int_t kxg = ixcell + ix - nx3;
447 if (kxg<=0 || kxg>nCellX) continue;
448 Float_t xg = (Float_t)(ix-nx3) - xc;
449
450 // Now calculate pad response
451 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
a3dfe79c 452 qpad += kNoise*rnor2;
fa412d9b 453 if (qpad<0) continue;
454
455 // Fill the array with pad response ID and amplitude
3d402178 456 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
fa412d9b 457 }
fa412d9b 458 }
fa412d9b 459 }
460}
461
462//____________________________________________________________________________
463Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
464 // ------------------------------------------------------------------------
465 // Calculate the amplitude in one CPV pad using the
466 // cumulative pad response function
467 // Author: Yuri Kharlov (after Serguei Sadovski)
468 // 3 October 2000
469 // ------------------------------------------------------------------------
470
471 Double_t dz = fGeom->GetPadSizeZ() / 2;
472 Double_t dx = fGeom->GetPadSizePhi() / 2;
473 Double_t z = zhit * fGeom->GetPadSizeZ();
474 Double_t x = xhit * fGeom->GetPadSizePhi();
475 Double_t amplitude = qhit *
476 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
477 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
478 return (Float_t)amplitude;
7587f5a5 479}
480
fa412d9b 481//____________________________________________________________________________
482Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
483 // ------------------------------------------------------------------------
484 // Cumulative pad response function
485 // It includes several terms from the CF decomposition in electrostatics
486 // Note: this cumulative function is wrong since omits some terms
487 // but the cell amplitude obtained with it is correct because
488 // these omitting terms cancel
489 // Author: Yuri Kharlov (after Serguei Sadovski)
490 // 3 October 2000
491 // ------------------------------------------------------------------------
492
a3dfe79c 493 const Double_t kA=1.0;
494 const Double_t kB=0.7;
fa412d9b 495
496 Double_t r2 = x*x + y*y;
497 Double_t xy = x*y;
498 Double_t cumulPRF = 0;
499 for (Int_t i=0; i<=4; i++) {
a3dfe79c 500 Double_t b1 = (2*i + 1) * kB;
fa412d9b 501 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
502 }
a3dfe79c 503 cumulPRF *= kA/(2*TMath::Pi());
fa412d9b 504 return cumulPRF;
505}
7eb9d12d 506