1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
18 //_________________________________________________________________________
19 // Implementation version v1 of PHOS Manager class
21 // Layout EMC + PPSD has name GPS2:
22 // Produces cumulated hits
24 // Layout EMC + CPV has name IHEP:
25 // Produces hits for CPV, cumulated hits
27 // Layout EMC + CPV + PPSD has name GPS:
28 // Produces hits for CPV, cumulated hits
30 //*-- Author: Yves Schutz (SUBATECH)
33 // --- ROOT system ---
41 // --- Standard library ---
46 #include <strstream.h>
48 // --- AliRoot header files ---
50 #include "AliPHOSv1.h"
51 #include "AliPHOSHit.h"
52 #include "AliPHOSCPVDigit.h"
56 #include "AliPHOSGeometry.h"
57 #include "AliPHOSQAIntCheckable.h"
58 #include "AliPHOSQAFloatCheckable.h"
59 #include "AliPHOSQAMeanChecker.h"
63 //____________________________________________________________________________
64 AliPHOSv1::AliPHOSv1():
67 // default ctor: initialze data memebers
73 fLightYieldMean = 0. ;
74 fIntrinsicPINEfficiency = 0. ;
75 fLightYieldAttenuation = 0. ;
76 fRecalibrationFactor = 0. ;
77 fElectronsPerGeV = 0. ;
82 //____________________________________________________________________________
83 AliPHOSv1::AliPHOSv1(const char *name, const char *title):
88 // - fHits (the "normal" one), which retains the hits associated with
89 // the current primary particle being tracked
90 // (this array is reset after each primary has been tracked).
95 // We do not want to save in TreeH the raw hits
96 // But save the cumulated hits instead (need to create the branch myself)
97 // It is put in the Digit Tree because the TreeH is filled after each primary
98 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
100 fHits= new TClonesArray("AliPHOSHit",1000) ;
104 fIshunt = 1 ; // All hits are associated with primary particles
106 //Photoelectron statistics:
107 // The light yield is a poissonian distribution of the number of
108 // photons created in the PbWo4 crystal, calculated using following formula
109 // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency *
110 // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit);
111 // LightYieldMean is parameter calculated to be over 47000 photons per GeV
112 // APDEfficiency is 0.02655
113 // k_0 is 0.0045 from Valery Antonenko
114 // The number of electrons created in the APD is
115 // NumberOfElectrons = APDGain * LightYield
116 // The APD Gain is 300
117 fLightYieldMean = 47000;
118 fIntrinsicPINEfficiency = 0.02655 ; //APD= 0.1875/0.1271 * 0.018 (PIN)
119 fLightYieldAttenuation = 0.0045 ;
120 fRecalibrationFactor = 13.418/ fLightYieldMean ;
121 fElectronsPerGeV = 2.77e+8 ;
124 Int_t nb = GetGeometry()->GetNModules() ;
127 fQAHitsMul = new AliPHOSQAIntCheckable("HitsM") ;
128 fQATotEner = new AliPHOSQAFloatCheckable("TotEn") ;
129 fQAHitsMulB = new TClonesArray("AliPHOSQAIntCheckable",nb) ;
130 fQATotEnerB = new TClonesArray("AliPHOSQAFloatCheckable", nb);
133 for ( i = 0 ; i < nb ; i++ ) {
134 sprintf(tempo, "HitsMB%d", i+1) ;
135 new( (*fQAHitsMulB)[i]) AliPHOSQAIntCheckable(tempo) ;
136 sprintf(tempo, "TotEnB%d", i+1) ;
137 new( (*fQATotEnerB)[i] ) AliPHOSQAFloatCheckable(tempo) ;
140 AliPHOSQAMeanChecker * hmc = new AliPHOSQAMeanChecker("HitsMul", 100. ,25.) ;
141 AliPHOSQAMeanChecker * emc = new AliPHOSQAMeanChecker("TotEner", 10. ,5.) ;
142 AliPHOSQAMeanChecker * bhmc = new AliPHOSQAMeanChecker("HitsMulB", 100. ,5.) ;
143 AliPHOSQAMeanChecker * bemc = new AliPHOSQAMeanChecker("TotEnerB", 2. ,.5) ;
145 // associate checkables and checkers
146 fQAHitsMul->AddChecker(hmc) ;
147 fQATotEner->AddChecker(emc) ;
148 for ( i = 0 ; i < nb ; i++ ) {
149 (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]))->AddChecker(bhmc) ;
150 (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]))->AddChecker(bemc) ;
155 //____________________________________________________________________________
156 AliPHOSv1::~AliPHOSv1()
169 //____________________________________________________________________________
170 void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits)
172 // Add a hit to the hit list.
173 // A PHOS hit is the sum of all hits in a single crystal from one primary and within soem taime gate
178 Bool_t deja = kFALSE ;
179 AliPHOSGeometry * geom = GetGeometry() ;
181 newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ;
183 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
184 curHit = dynamic_cast<AliPHOSHit*>((*fHits)[hitCounter]) ;
185 if(curHit->GetPrimary() != primary) break ;
186 // We add hits with the same primary, while GEANT treats primaries succesively
187 if( *curHit == *newHit ) {
194 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
195 // get the block Id number
197 geom->AbsToRelNumbering(Id, relid) ;
198 // and fill the relevant QA checkable (only if in PbW04)
199 if ( relid[1] == 0 ) {
200 fQAHitsMul->Update(1) ;
201 (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[relid[0]-1]))->Update(1) ;
209 //____________________________________________________________________________
210 void AliPHOSv1::FinishPrimary()
212 // called at the end of each track (primary) by AliRun
213 // hits are reset for each new track
214 // accumulate the total hit-multiplicity
216 // fQAHitsMul->Update( fHits->GetEntriesFast() ) ;
220 //____________________________________________________________________________
221 void AliPHOSv1::FinishEvent()
223 // called at the end of each event by AliRun
224 // accumulate the hit-multiplicity and total energy per block
225 // if the values have been updated check it
228 if ( fQATotEner->HasChanged() ) {
229 fQATotEner->CheckMe() ;
230 fQATotEner->Reset() ;
235 if ( fQAHitsMulB && fQATotEnerB ) {
236 for (i = 0 ; i < GetGeometry()->GetNModules() ; i++) {
237 AliPHOSQAIntCheckable * ci = static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]) ;
238 AliPHOSQAFloatCheckable* cf = static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]) ;
239 if ( ci->HasChanged() ) {
243 if ( cf->HasChanged() ) {
250 // check the total multiplicity
253 if ( fQAHitsMul->HasChanged() ) {
254 fQAHitsMul->CheckMe() ;
255 fQAHitsMul->Reset() ;
259 //____________________________________________________________________________
260 void AliPHOSv1::StepManager(void)
262 // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell
264 Int_t relid[4] ; // (box, layer, row, column) indices
265 Int_t absid ; // absolute cell ID number
266 Float_t xyze[5]={-1000,-1000,-1000,0,0} ; // position wrt MRS, time and energy deposited
267 TLorentzVector pos ; // Lorentz vector of the track current position
270 Int_t tracknumber = gAlice->CurrentTrack() ;
271 Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
272 TString name = GetGeometry()->GetName() ;
276 if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") &&
277 (gMC->IsTrackEntering() ) &&
278 gMC->TrackCharge() != 0) {
280 gMC -> TrackPosition(pos);
282 Float_t xyzm[3], xyzd[3] ;
284 for (i=0; i<3; i++) xyzm[i] = pos[i];
285 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
287 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
292 // Current momentum of the hit's track in the local ref. system
293 TLorentzVector pmom ; //momentum of the particle initiated hit
294 gMC -> TrackMomentum(pmom);
295 Float_t pm[3], pd[3];
299 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
304 // Digitize the current CPV hit:
306 // 1. find pad response and
307 gMC->CurrentVolOffID(3,moduleNumber);
310 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
311 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
316 Int_t idigit,ndigits;
318 // 2. go through the current digit list and sum digits in pads
320 ndigits = cpvDigits->GetEntriesFast();
321 for (idigit=0; idigit<ndigits-1; idigit++) {
322 AliPHOSCPVDigit *cpvDigit1 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit));
323 Float_t x1 = cpvDigit1->GetXpad() ;
324 Float_t z1 = cpvDigit1->GetYpad() ;
325 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
326 AliPHOSCPVDigit *cpvDigit2 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(jdigit));
327 Float_t x2 = cpvDigit2->GetXpad() ;
328 Float_t z2 = cpvDigit2->GetYpad() ;
329 if (x1==x2 && z1==z2) {
330 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
331 cpvDigit2->SetQpad(qsum) ;
332 cpvDigits->RemoveAt(idigit) ;
336 cpvDigits->Compress() ;
338 // 3. add digits to temporary hit list fTmpHits
340 ndigits = cpvDigits->GetEntriesFast();
341 for (idigit=0; idigit<ndigits; idigit++) {
342 AliPHOSCPVDigit *cpvDigit = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit));
343 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
344 relid[1] =-1 ; // means CPV
345 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
346 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
348 // get the absolute Id number
349 GetGeometry()->RelToAbsNumbering(relid, absid) ;
351 // add current digit to the temporary hit list
353 xyze[3] = gMC->TrackTime() ;
354 xyze[4] = cpvDigit->GetQpad() ; // amplitude in a pad
355 primary = -1; // No need in primary for CPV
356 AddHit(fIshunt, primary, tracknumber, absid, xyze);
358 if (cpvDigit->GetQpad() > 0.02) {
359 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
360 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
361 qsum += cpvDigit->GetQpad();
373 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
375 gMC->TrackPosition(pos) ;
379 Float_t global[3], local[3] ;
383 Float_t lostenergy = gMC->Edep();
385 if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy
387 xyze[3] = gMC->TrackTime() ;
389 gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ;
391 // fill the relevant QA Checkables
392 fQATotEner->Update( xyze[4] ) ; // total energy in PHOS
393 (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[moduleNumber-1]))->Update( xyze[4] ) ; // energy in this block
396 gMC->CurrentVolOffID(3, strip);
398 gMC->CurrentVolOffID(2, cell);
400 Int_t row = 1 + GetGeometry()->GetNZ() - strip % GetGeometry()->GetNZ() ;
401 Int_t col = (Int_t) TMath::Ceil((Double_t) strip/GetGeometry()->GetNZ()) -1 ;
403 absid = (moduleNumber-1)*GetGeometry()->GetNCristalsInModule() +
404 row + (col*GetGeometry()->GetEMCAGeometry()->GetNCellsInStrip() + cell-1)*GetGeometry()->GetNZ() ;
406 gMC->Gmtod(global, local, 1) ;
408 //Calculates the light yield, the number of photns produced in the
410 Float_t lightYield = gRandom->Poisson(fLightYieldMean * lostenergy *
411 fIntrinsicPINEfficiency *
412 exp(-fLightYieldAttenuation *
413 (local[1]+GetGeometry()->GetCrystalSize(1)/2.0 ))
415 //Calculates de energy deposited in the crystal
416 xyze[4] = (fRecalibrationFactor/100.) * fAPDGain * lightYield ;
418 // add current hit to the hit list
419 AddHit(fIshunt, primary,tracknumber, absid, xyze);
422 } // there is deposited energy
423 } // we are inside a PHOS Xtal
427 //____________________________________________________________________________
428 void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
430 // ------------------------------------------------------------------------
431 // Digitize one CPV hit:
432 // On input take exact 4-momentum p and position zxhit of the hit,
433 // find the pad response around this hit and
434 // put the amplitudes in the pads into array digits
436 // Author: Yuri Kharlov (after Serguei Sadovsky)
438 // ------------------------------------------------------------------------
440 const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
441 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
442 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
443 const Int_t kNgamz = 5; // Ionization size in Z
444 const Int_t kNgamx = 9; // Ionization size in Phi
445 const Float_t kNoise = 0.03; // charge noise in one pad
449 // Just a reminder on axes notation in the CPV module:
450 // axis Z goes along the beam
451 // axis X goes across the beam in the module plane
452 // axis Y is a normal to the module plane showing from the IP
454 Float_t hitX = zxhit[0];
455 Float_t hitZ =-zxhit[1];
458 Float_t pNorm = p.Py();
459 Float_t eloss = kdEdx;
461 // cout << "CPVDigitize: YVK : "<<hitX<<" "<<hitZ<<" | "<<pX<<" "<<pZ<<" "<<pNorm<<endl;
463 Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
464 Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
465 gRandom->Rannor(rnor1,rnor2);
466 eloss *= (1 + kDetR*rnor1) *
467 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
468 Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
469 Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
470 Float_t zhit2 = zhit1 + dZY;
471 Float_t xhit2 = xhit1 + dXY;
473 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
474 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
478 if (iwht1==iwht2) { // incline 1-wire hit
480 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
481 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
483 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
484 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
487 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
489 Int_t iwht3 = (iwht1 + iwht2) / 2;
490 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
491 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
492 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
493 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
494 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
495 Float_t dxw1 = xhit1 - xwr13;
496 Float_t dxw2 = xhit2 - xwr23;
497 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
498 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
499 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
500 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
502 zxe[2][0] = eloss * egm1;
503 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
505 zxe[2][1] = eloss * egm2;
506 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
508 zxe[2][2] = eloss * egm3;
510 else { // incline 2-wire hit
512 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
513 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
514 Float_t xwr12 = (xwht1 + xwht2) / 2;
515 Float_t dxw1 = xhit1 - xwr12;
516 Float_t dxw2 = xhit2 - xwr12;
517 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
518 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
519 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
521 zxe[2][0] = eloss * egm1;
522 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
524 zxe[2][1] = eloss * egm2;
527 // Finite size of ionization region
529 Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
530 Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
531 Int_t nz3 = (kNgamz+1)/2;
532 Int_t nx3 = (kNgamx+1)/2;
533 cpvDigits->Expand(nIter*kNgamx*kNgamz);
534 TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits));
536 for (Int_t iter=0; iter<nIter; iter++) {
538 Float_t zhit = zxe[0][iter];
539 Float_t xhit = zxe[1][iter];
540 Float_t qhit = zxe[2][iter];
541 Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
542 Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
543 if ( zcell<=0 || xcell<=0 ||
544 zcell>=nCellZ || xcell>=nCellX) return;
545 Int_t izcell = (Int_t) zcell;
546 Int_t ixcell = (Int_t) xcell;
547 Float_t zc = zcell - izcell - 0.5;
548 Float_t xc = xcell - ixcell - 0.5;
549 for (Int_t iz=1; iz<=kNgamz; iz++) {
550 Int_t kzg = izcell + iz - nz3;
551 if (kzg<=0 || kzg>nCellZ) continue;
552 Float_t zg = (Float_t)(iz-nz3) - zc;
553 for (Int_t ix=1; ix<=kNgamx; ix++) {
554 Int_t kxg = ixcell + ix - nx3;
555 if (kxg<=0 || kxg>nCellX) continue;
556 Float_t xg = (Float_t)(ix-nx3) - xc;
558 // Now calculate pad response
559 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
560 qpad += kNoise*rnor2;
561 if (qpad<0) continue;
563 // Fill the array with pad response ID and amplitude
564 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
570 //____________________________________________________________________________
571 Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
572 // ------------------------------------------------------------------------
573 // Calculate the amplitude in one CPV pad using the
574 // cumulative pad response function
575 // Author: Yuri Kharlov (after Serguei Sadovski)
577 // ------------------------------------------------------------------------
579 Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
580 Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
581 Double_t z = zhit * GetGeometry()->GetPadSizeZ();
582 Double_t x = xhit * GetGeometry()->GetPadSizePhi();
583 Double_t amplitude = qhit *
584 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
585 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
586 return (Float_t)amplitude;
589 //____________________________________________________________________________
590 Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
591 // ------------------------------------------------------------------------
592 // Cumulative pad response function
593 // It includes several terms from the CF decomposition in electrostatics
594 // Note: this cumulative function is wrong since omits some terms
595 // but the cell amplitude obtained with it is correct because
596 // these omitting terms cancel
597 // Author: Yuri Kharlov (after Serguei Sadovski)
599 // ------------------------------------------------------------------------
601 const Double_t kA=1.0;
602 const Double_t kB=0.7;
604 Double_t r2 = x*x + y*y;
606 Double_t cumulPRF = 0;
607 for (Int_t i=0; i<=4; i++) {
608 Double_t b1 = (2*i + 1) * kB;
609 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
611 cumulPRF *= kA/(2*TMath::Pi());