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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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18 /* History of cvs commits:
21 * Revision 1.111 2007/07/24 09:41:19 morsch
22 * AliStack included for kKeepBit.
24 * Revision 1.110 2007/03/10 08:58:52 kharlov
25 * Protection for noCPV geometry
27 * Revision 1.109 2007/03/01 11:37:37 kharlov
28 * Strip units changed from 8x1 to 8x2 (T.Pocheptsov)
30 * Revision 1.108 2007/02/02 09:40:50 alibrary
31 * Includes required by ROOT head
33 * Revision 1.107 2007/02/01 10:34:47 hristov
34 * Removing warnings on Solaris x86
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
39 * Revision 1.105 2006/09/13 07:31:01 kharlov
40 * Effective C++ corrections (T.Pocheptsov)
42 * Revision 1.104 2005/05/28 14:19:05 schutz
43 * Compilation warnings fixed by T.P.
47 //_________________________________________________________________________
48 // Implementation version v1 of PHOS Manager class
51 // Layout EMC + CPV has name IHEP:
52 // Produces hits for CPV, cumulated hits
55 //*-- Author: Yves Schutz (SUBATECH)
58 // --- ROOT system ---
59 #include <TClonesArray.h>
60 #include <TParticle.h>
61 #include <TVirtualMC.h>
63 // --- Standard library ---
66 // --- AliRoot header files ---
67 #include "AliPHOSCPVDigit.h"
68 #include "AliPHOSGeometry.h"
69 #include "AliPHOSHit.h"
70 #include "AliPHOSv1.h"
74 #include "AliPHOSSimParam.h"
78 //____________________________________________________________________________
79 AliPHOSv1::AliPHOSv1() : fCPVDigits(0)
84 //____________________________________________________________________________
85 AliPHOSv1::AliPHOSv1(const char *name, const char *title):
86 AliPHOSv0(name,title), fCPVDigits(new TClonesArray("AliPHOSCPVDigit",20))
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).
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() ).
102 fHits= new TClonesArray("AliPHOSHit",1000) ;
103 fCPVDigits = new TClonesArray("AliPHOSCPVDigit",20);
104 gAlice->GetMCApp()->AddHitList(fHits) ;
108 fIshunt = 2 ; // All hits are associated with primary particles
111 //____________________________________________________________________________
112 AliPHOSv1::~AliPHOSv1()
122 //____________________________________________________________________________
123 void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t Id, Float_t * hits)
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
131 Bool_t deja = kFALSE ;
132 AliPHOSGeometry * geom = GetGeometry() ;
134 newHit = new AliPHOSHit(shunt, primary, Id, hits) ;
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 ) {
147 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
148 // get the block Id number
150 geom->AbsToRelNumbering(Id, relid) ;
158 //____________________________________________________________________________
159 void AliPHOSv1::FinishPrimary()
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
167 //____________________________________________________________________________
168 void AliPHOSv1::FinishEvent()
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
174 AliDetector::FinishEvent();
176 //____________________________________________________________________________
177 void AliPHOSv1::StepManager(void)
179 // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell
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
189 static Int_t idPCPQ = -1;
190 if (strstr(fTitle.Data(),"noCPV") == 0)
191 idPCPQ = gMC->VolId("PCPQ");
193 if( gMC->CurrentVolID(copy) == idPCPQ &&
194 (gMC->IsTrackEntering() ) &&
195 gMC->TrackCharge() != 0) {
197 gMC -> TrackPosition(pos);
199 Float_t xyzm[3], xyzd[3] ;
201 for (i=0; i<3; i++) xyzm[i] = pos[i];
202 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
205 Float_t xyd[3]={0,0,0} ; //local position of the entering
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];
217 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
222 // Digitize the current CPV hit:
224 // 1. find pad response and
225 gMC->CurrentVolOffID(3,moduleNumber);
228 // TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
229 CPVDigitize(pmom,xyd,fCPVDigits);
234 Int_t idigit,ndigits;
236 // 2. go through the current digit list and sum digits in pads
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) ;
254 fCPVDigits->Compress() ;
256 // 3. add digits to temporary hit list fTmpHits
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
266 // get the absolute Id number
267 GetGeometry()->RelToAbsNumbering(relid, absid) ;
269 // add current digit to the temporary hit list
271 xyzte[3] = gMC->TrackTime() ;
272 xyzte[4] = cpvDigit->GetQpad() ; // amplitude in a pad
274 Int_t primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() );
275 AddHit(fIshunt, primary, absid, xyzte);
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();
287 static Int_t idPXTL = gMC->VolId("PXTL");
288 if(gMC->CurrentVolID(copy) == idPXTL ) { // We are inside a PBWO crystal
290 gMC->TrackPosition(pos) ;
295 Float_t lostenergy = gMC->Edep();
297 //Put in the TreeK particle entering PHOS and all its parents
298 if ( gMC->IsTrackEntering() ){
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] ;
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() ;
320 if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy
321 xyzte[3] = gMC->TrackTime() ;
323 gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ;
326 gMC->CurrentVolOffID(3, strip);
328 gMC->CurrentVolOffID(2, cell);
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 ;
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);
341 //Calculates the light yield, the number of photons produced in the
343 //There is no dependence of reponce on distance from energy deposition to APD
344 Float_t lightYield = gRandom->Poisson(AliPHOSSimParam::GetInstance()->GetLightFactor() * lostenergy) ;
346 //Calculates de energy deposited in the crystal
347 xyzte[4] = AliPHOSSimParam::GetInstance()->GetAPDFactor() * lightYield ;
351 primary = gAlice->GetMCApp()->GetCurrentTrackNumber() ;
352 TParticle * part = gAlice->GetMCApp()->Particle(primary) ;
353 while ( !part->TestBit(kKeepBit) ) {
354 primary = part->GetFirstMother() ;
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.
362 part = gAlice->GetMCApp()->Particle(primary) ;
366 primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() );
369 // add current hit to the hit list
370 // Info("StepManager","%d %d", primary, tracknumber) ;
371 AddHit(fIshunt, primary, absid, xyzte);
373 } // there is deposited energy
374 } // we are inside a PHOS Xtal
378 //____________________________________________________________________________
379 void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, TClonesArray *cpvDigits)
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
387 // Author: Yuri Kharlov (after Serguei Sadovsky)
389 // ------------------------------------------------------------------------
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
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
405 Float_t hitX = zxhit[0];
406 Float_t hitZ =-zxhit[1];
409 Float_t pNorm = p.Py();
410 Float_t eloss = kdEdx;
412 //Info("CPVDigitize", "YVK : %f %f | %f %f %d", hitX, hitZ, pX, pZ, pNorm) ;
414 Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
415 Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
416 gRandom->Rannor(rnor1,rnor2);
417 eloss *= (1 + kDetR*rnor1) *
418 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
419 Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
420 Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
421 Float_t zhit2 = zhit1 + dZY;
422 Float_t xhit2 = xhit1 + dXY;
424 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
425 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
429 if (iwht1==iwht2) { // incline 1-wire hit
431 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
432 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
434 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
435 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
438 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
440 Int_t iwht3 = (iwht1 + iwht2) / 2;
441 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
442 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
443 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
444 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
445 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
446 Float_t dxw1 = xhit1 - xwr13;
447 Float_t dxw2 = xhit2 - xwr23;
448 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
449 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
450 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
451 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
453 zxe[2][0] = eloss * egm1;
454 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
456 zxe[2][1] = eloss * egm2;
457 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
459 zxe[2][2] = eloss * egm3;
461 else { // incline 2-wire hit
463 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
464 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
465 Float_t xwr12 = (xwht1 + xwht2) / 2;
466 Float_t dxw1 = xhit1 - xwr12;
467 Float_t dxw2 = xhit2 - xwr12;
468 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
469 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
470 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
472 zxe[2][0] = eloss * egm1;
473 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
475 zxe[2][1] = eloss * egm2;
478 // Finite size of ionization region
480 Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
481 Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
482 Int_t nz3 = (kNgamz+1)/2;
483 Int_t nx3 = (kNgamx+1)/2;
484 cpvDigits->Expand(nIter*kNgamx*kNgamz);
485 TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits));
487 for (Int_t iter=0; iter<nIter; iter++) {
489 Float_t zhit = zxe[0][iter];
490 Float_t xhit = zxe[1][iter];
491 Float_t qhit = zxe[2][iter];
492 Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
493 Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
494 if ( zcell<=0 || xcell<=0 ||
495 zcell>=nCellZ || xcell>=nCellX) return;
496 Int_t izcell = (Int_t) zcell;
497 Int_t ixcell = (Int_t) xcell;
498 Float_t zc = zcell - izcell - 0.5;
499 Float_t xc = xcell - ixcell - 0.5;
500 for (Int_t iz=1; iz<=kNgamz; iz++) {
501 Int_t kzg = izcell + iz - nz3;
502 if (kzg<=0 || kzg>nCellZ) continue;
503 Float_t zg = (Float_t)(iz-nz3) - zc;
504 for (Int_t ix=1; ix<=kNgamx; ix++) {
505 Int_t kxg = ixcell + ix - nx3;
506 if (kxg<=0 || kxg>nCellX) continue;
507 Float_t xg = (Float_t)(ix-nx3) - xc;
509 // Now calculate pad response
510 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
511 qpad += kNoise*rnor2;
512 if (qpad<0) continue;
514 // Fill the array with pad response ID and amplitude
515 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
521 //____________________________________________________________________________
522 Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
523 // ------------------------------------------------------------------------
524 // Calculate the amplitude in one CPV pad using the
525 // cumulative pad response function
526 // Author: Yuri Kharlov (after Serguei Sadovski)
528 // ------------------------------------------------------------------------
530 Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
531 Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
532 Double_t z = zhit * GetGeometry()->GetPadSizeZ();
533 Double_t x = xhit * GetGeometry()->GetPadSizePhi();
534 Double_t amplitude = qhit *
535 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
536 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
537 return (Float_t)amplitude;
540 //____________________________________________________________________________
541 Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
542 // ------------------------------------------------------------------------
543 // Cumulative pad response function
544 // It includes several terms from the CF decomposition in electrostatics
545 // Note: this cumulative function is wrong since omits some terms
546 // but the cell amplitude obtained with it is correct because
547 // these omitting terms cancel
548 // Author: Yuri Kharlov (after Serguei Sadovski)
550 // ------------------------------------------------------------------------
552 const Double_t kA=1.0;
553 const Double_t kB=0.7;
555 Double_t r2 = x*x + y*y;
557 Double_t cumulPRF = 0;
558 for (Int_t i=0; i<=4; i++) {
559 Double_t b1 = (2*i + 1) * kB;
560 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
562 cumulPRF *= kA/(2*TMath::Pi());