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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//_________________________________________________________________________
19// Implementation version v1 of PHOS Manager class
20//---
21// Layout EMC + PPSD has name GPS2:
22// Produces cumulated hits
23//---
24// Layout EMC + CPV has name IHEP:
25// Produces hits for CPV, cumulated hits
26//---
27// Layout EMC + CPV + PPSD has name GPS:
28// Produces hits for CPV, cumulated hits
29//---
30//*-- Author: Yves Schutz (SUBATECH)
31
32
33// --- ROOT system ---
34
35#include "TBRIK.h"
36#include "TNode.h"
37#include "TRandom.h"
38#include "TTree.h"
39
40
41// --- Standard library ---
42
43#include <stdio.h>
44#include <string.h>
45#include <stdlib.h>
46#include <strstream.h>
47
48// --- AliRoot header files ---
49
50#include "AliPHOSv1.h"
51#include "AliPHOSHit.h"
52#include "AliPHOSCPVDigit.h"
53#include "AliRun.h"
54#include "AliConst.h"
55#include "AliMC.h"
56#include "AliPHOSGeometry.h"
57
58ClassImp(AliPHOSv1)
59
60//____________________________________________________________________________
61AliPHOSv1::AliPHOSv1():
62AliPHOSv0()
63{
64 // ctor
65}
66
67//____________________________________________________________________________
68AliPHOSv1::AliPHOSv1(const char *name, const char *title):
69AliPHOSv0(name,title)
70{
71 // ctor : title is used to identify the layout
72 // GPS2 = 5 modules (EMC + PPSD)
73 // IHEP = 5 modules (EMC + CPV )
74 // MIXT = 4 modules (EMC + CPV ) and 1 module (EMC + PPSD)
75 //
76 // We store hits :
77 // - fHits (the "normal" one), which retains the hits associated with
78 // the current primary particle being tracked
79 // (this array is reset after each primary has been tracked).
80 //
81
82
83
84 // We do not want to save in TreeH the raw hits
85 // But save the cumulated hits instead (need to create the branch myself)
86 // It is put in the Digit Tree because the TreeH is filled after each primary
87 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
88
89 fHits= new TClonesArray("AliPHOSHit",1000) ;
90
91 fNhits = 0 ;
92
93 fIshunt = 1 ; // All hits are associated with primary particles
94
95}
96
97//____________________________________________________________________________
98AliPHOSv1::~AliPHOSv1()
99{
100 // dtor
101
102 if ( fHits) {
103 fHits->Delete() ;
104 delete fHits ;
105 fHits = 0 ;
106 }
107}
108
109//____________________________________________________________________________
110void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits)
111{
112 // Add a hit to the hit list.
113 // A PHOS hit is the sum of all hits in a single crystal
114 // or in a single PPSD gas cell
115
116 Int_t hitCounter ;
117 AliPHOSHit *newHit ;
118 AliPHOSHit *curHit ;
119 Bool_t deja = kFALSE ;
120
121 newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ;
122
123 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
124 curHit = (AliPHOSHit*) (*fHits)[hitCounter] ;
125 if(curHit->GetPrimary() != primary) break ; // We add hits with the same primary, while GEANT treats primaries succesively
126 if( *curHit == *newHit ) {
127 *curHit = *curHit + *newHit ;
128 deja = kTRUE ;
129 }
130 }
131
132 if ( !deja ) {
133 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
134 fNhits++ ;
135 }
136
137 delete newHit;
138}
139
140//____________________________________________________________________________
141void AliPHOSv1::StepManager(void)
142{
143 // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
144
145 Int_t relid[4] ; // (box, layer, row, column) indices
146 Int_t absid ; // absolute cell ID number
147 Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
148 TLorentzVector pos ; // Lorentz vector of the track current position
149 Int_t copy ;
150
151 Int_t tracknumber = gAlice->CurrentTrack() ;
152 Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
153 TString name = fGeom->GetName() ;
154
155
156 if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD
157
158 if( gMC->CurrentVolID(copy) == gMC->VolId("PPCE") ) // We are inside a gas cell
159 {
160 gMC->TrackPosition(pos) ;
161 xyze[0] = pos[0] ;
162 xyze[1] = pos[1] ;
163 xyze[2] = pos[2] ;
164 xyze[3] = gMC->Edep() ;
165
166 if ( xyze[3] != 0 ) { // there is deposited energy
167 gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number
168 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){
169 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
170 }
171 gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
172 // 1-> fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper
173 // > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower
174 gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell
175 gMC->CurrentVolID(relid[3]) ; // get the column number
176
177 // get the absolute Id number
178
179 fGeom->RelToAbsNumbering(relid, absid) ;
180
181 // add current hit to the hit list
182 AddHit(fIshunt, primary, tracknumber, absid, xyze);
183
184
185 } // there is deposited energy
186 } // We are inside the gas of the CPV
187 } // GPS2 configuration
188
189 if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one
190
191 // Yuri Kharlov, 28 September 2000
192
193 if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") &&
194 (gMC->IsTrackEntering() ) &&
195 gMC->TrackCharge() != 0) {
196
197 gMC -> TrackPosition(pos);
198 Float_t xyzm[3], xyzd[3] ;
199 Int_t i;
200 for (i=0; i<3; i++) xyzm[i] = pos[i];
201 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
202
203 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
204 xyd[0] = xyzd[0];
205 xyd[1] =-xyzd[1];
206 xyd[2] =-xyzd[2];
207
208
209 // Current momentum of the hit's track in the local ref. system
210 TLorentzVector pmom ; //momentum of the particle initiated hit
211 gMC -> TrackMomentum(pmom);
212 Float_t pm[3], pd[3];
213 for (i=0; i<3; i++) pm[i] = pmom[i];
214 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
215 pmom[0] = pd[0];
216 pmom[1] =-pd[1];
217 pmom[2] =-pd[2];
218
219 // Digitize the current CPV hit:
220
221 // 1. find pad response and
222
223 Int_t moduleNumber;
224 gMC->CurrentVolOffID(3,moduleNumber);
225 moduleNumber--;
226
227
228 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
229 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
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 = cpvDigits->GetEntriesFast();
239 for (idigit=0; idigit<ndigits-1; idigit++) {
240 AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->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 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
245 Float_t x2 = cpvDigit2->GetXpad() ;
246 Float_t z2 = cpvDigit2->GetYpad() ;
247 if (x1==x2 && z1==z2) {
248 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
249 cpvDigit2->SetQpad(qsum) ;
250 cpvDigits->RemoveAt(idigit) ;
251 }
252 }
253 }
254 cpvDigits->Compress() ;
255
256 // 3. add digits to temporary hit list fTmpHits
257
258 ndigits = cpvDigits->GetEntriesFast();
259 for (idigit=0; idigit<ndigits; idigit++) {
260 AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->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 fGeom->RelToAbsNumbering(relid, absid) ;
268
269 // add current digit to the temporary hit list
270 xyze[0] = 0. ;
271 xyze[1] = 0. ;
272 xyze[2] = 0. ;
273 xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
274 primary = -1; // No need in primary for CPV
275 AddHit(fIshunt, primary, tracknumber, absid, xyze);
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 delete cpvDigits;
284 }
285 } // end of IHEP configuration
286
287
288 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
289 gMC->TrackPosition(pos) ;
290 xyze[0] = pos[0] ;
291 xyze[1] = pos[1] ;
292 xyze[2] = pos[2] ;
293 xyze[3] = gMC->Edep() ;
294
295
296 if ( xyze[3] != 0 ) { // Track is inside the crystal and deposits some energy
297
298 gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
299
300 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 )
301 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
302
303 relid[1] = 0 ; // means PBW04
304 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
305 gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
306
307 // get the absolute Id number
308 fGeom->RelToAbsNumbering(relid, absid) ;
309
310 // add current hit to the hit list
311 AddHit(fIshunt, primary,tracknumber, absid, xyze);
312
313
314 } // there is deposited energy
315 } // we are inside a PHOS Xtal
316}
317
318//____________________________________________________________________________
319void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
320{
321 // ------------------------------------------------------------------------
322 // Digitize one CPV hit:
323 // On input take exact 4-momentum p and position zxhit of the hit,
324 // find the pad response around this hit and
325 // put the amplitudes in the pads into array digits
326 //
327 // Author: Yuri Kharlov (after Serguei Sadovsky)
328 // 2 October 2000
329 // ------------------------------------------------------------------------
330
331 const Float_t kCelWr = fGeom->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
332 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
333 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
334 const Int_t kNgamz = 5; // Ionization size in Z
335 const Int_t kNgamx = 9; // Ionization size in Phi
336 const Float_t kNoise = 0.03; // charge noise in one pad
337
338 Float_t rnor1,rnor2;
339
340 // Just a reminder on axes notation in the CPV module:
341 // axis Z goes along the beam
342 // axis X goes across the beam in the module plane
343 // axis Y is a normal to the module plane showing from the IP
344
345 Float_t hitX = zxhit[0];
346 Float_t hitZ =-zxhit[1];
347 Float_t pX = p.Px();
348 Float_t pZ =-p.Pz();
349 Float_t pNorm = p.Py();
350 Float_t eloss = kdEdx;
351
352 Float_t dZY = pZ/pNorm * fGeom->GetCPVGasThickness();
353 Float_t dXY = pX/pNorm * fGeom->GetCPVGasThickness();
354 gRandom->Rannor(rnor1,rnor2);
355 eloss *= (1 + kDetR*rnor1) *
356 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(fGeom->GetCPVGasThickness(),2)));
357 Float_t zhit1 = hitZ + fGeom->GetCPVActiveSize(1)/2 - dZY/2;
358 Float_t xhit1 = hitX + fGeom->GetCPVActiveSize(0)/2 - dXY/2;
359 Float_t zhit2 = zhit1 + dZY;
360 Float_t xhit2 = xhit1 + dXY;
361
362 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
363 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
364
365 Int_t nIter;
366 Float_t zxe[3][5];
367 if (iwht1==iwht2) { // incline 1-wire hit
368 nIter = 2;
369 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
370 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
371 zxe[2][0] = eloss/2;
372 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
373 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
374 zxe[2][1] = eloss/2;
375 }
376 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
377 nIter = 3;
378 Int_t iwht3 = (iwht1 + iwht2) / 2;
379 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
380 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
381 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
382 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
383 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
384 Float_t dxw1 = xhit1 - xwr13;
385 Float_t dxw2 = xhit2 - xwr23;
386 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
387 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
388 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
389 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
390 zxe[1][0] = xwht1;
391 zxe[2][0] = eloss * egm1;
392 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
393 zxe[1][1] = xwht2;
394 zxe[2][1] = eloss * egm2;
395 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
396 zxe[1][2] = xwht3;
397 zxe[2][2] = eloss * egm3;
398 }
399 else { // incline 2-wire hit
400 nIter = 2;
401 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
402 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
403 Float_t xwr12 = (xwht1 + xwht2) / 2;
404 Float_t dxw1 = xhit1 - xwr12;
405 Float_t dxw2 = xhit2 - xwr12;
406 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
407 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
408 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
409 zxe[1][0] = xwht1;
410 zxe[2][0] = eloss * egm1;
411 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
412 zxe[1][1] = xwht2;
413 zxe[2][1] = eloss * egm2;
414 }
415
416 // Finite size of ionization region
417
418 Int_t nCellZ = fGeom->GetNumberOfCPVPadsZ();
419 Int_t nCellX = fGeom->GetNumberOfCPVPadsPhi();
420 Int_t nz3 = (kNgamz+1)/2;
421 Int_t nx3 = (kNgamx+1)/2;
422 cpvDigits->Expand(nIter*kNgamx*kNgamz);
423 TClonesArray &ldigits = *(TClonesArray *)cpvDigits;
424
425 for (Int_t iter=0; iter<nIter; iter++) {
426
427 Float_t zhit = zxe[0][iter];
428 Float_t xhit = zxe[1][iter];
429 Float_t qhit = zxe[2][iter];
430 Float_t zcell = zhit / fGeom->GetPadSizeZ();
431 Float_t xcell = xhit / fGeom->GetPadSizePhi();
432 if ( zcell<=0 || xcell<=0 ||
433 zcell>=nCellZ || xcell>=nCellX) return;
434 Int_t izcell = (Int_t) zcell;
435 Int_t ixcell = (Int_t) xcell;
436 Float_t zc = zcell - izcell - 0.5;
437 Float_t xc = xcell - ixcell - 0.5;
438 for (Int_t iz=1; iz<=kNgamz; iz++) {
439 Int_t kzg = izcell + iz - nz3;
440 if (kzg<=0 || kzg>nCellZ) continue;
441 Float_t zg = (Float_t)(iz-nz3) - zc;
442 for (Int_t ix=1; ix<=kNgamx; ix++) {
443 Int_t kxg = ixcell + ix - nx3;
444 if (kxg<=0 || kxg>nCellX) continue;
445 Float_t xg = (Float_t)(ix-nx3) - xc;
446
447 // Now calculate pad response
448 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
449 qpad += kNoise*rnor2;
450 if (qpad<0) continue;
451
452 // Fill the array with pad response ID and amplitude
453 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
454 }
455 }
456 }
457}
458
459//____________________________________________________________________________
460Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
461 // ------------------------------------------------------------------------
462 // Calculate the amplitude in one CPV pad using the
463 // cumulative pad response function
464 // Author: Yuri Kharlov (after Serguei Sadovski)
465 // 3 October 2000
466 // ------------------------------------------------------------------------
467
468 Double_t dz = fGeom->GetPadSizeZ() / 2;
469 Double_t dx = fGeom->GetPadSizePhi() / 2;
470 Double_t z = zhit * fGeom->GetPadSizeZ();
471 Double_t x = xhit * fGeom->GetPadSizePhi();
472 Double_t amplitude = qhit *
473 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
474 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
475 return (Float_t)amplitude;
476}
477
478//____________________________________________________________________________
479Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
480 // ------------------------------------------------------------------------
481 // Cumulative pad response function
482 // It includes several terms from the CF decomposition in electrostatics
483 // Note: this cumulative function is wrong since omits some terms
484 // but the cell amplitude obtained with it is correct because
485 // these omitting terms cancel
486 // Author: Yuri Kharlov (after Serguei Sadovski)
487 // 3 October 2000
488 // ------------------------------------------------------------------------
489
490 const Double_t kA=1.0;
491 const Double_t kB=0.7;
492
493 Double_t r2 = x*x + y*y;
494 Double_t xy = x*y;
495 Double_t cumulPRF = 0;
496 for (Int_t i=0; i<=4; i++) {
497 Double_t b1 = (2*i + 1) * kB;
498 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
499 }
500 cumulPRF *= kA/(2*TMath::Pi());
501 return cumulPRF;
502}
503