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
74 //____________________________________________________________________________
75 AliPHOSv1::AliPHOSv1(const char *name, const char *title):
78 // ctor : title is used to identify the layout
79 // GPS2 = 5 modules (EMC + PPSD)
80 // IHEP = 5 modules (EMC + CPV )
81 // MIXT = 4 modules (EMC + CPV ) and 1 module (EMC + PPSD)
84 // - fHits (the "normal" one), which retains the hits associated with
85 // the current primary particle being tracked
86 // (this array is reset after each primary has been tracked).
91 // We do not want to save in TreeH the raw hits
92 // But save the cumulated hits instead (need to create the branch myself)
93 // It is put in the Digit Tree because the TreeH is filled after each primary
94 // and the TreeD at the end of the event (branch is set in FinishEvent() ).
96 fHits= new TClonesArray("AliPHOSHit",1000) ;
100 fIshunt = 1 ; // All hits are associated with primary particles
102 Int_t nb = GetGeometry()->GetNModules() ;
105 fQAHitsMul = new AliPHOSQAIntCheckable("HitsM") ;
106 fQATotEner = new AliPHOSQAFloatCheckable("TotEn") ;
107 fQAHitsMulB = new TClonesArray("AliPHOSQAIntCheckable",nb) ;
108 fQATotEnerB = new TClonesArray("AliPHOSQAFloatCheckable", nb);
111 for ( i = 0 ; i < nb ; i++ ) {
112 sprintf(tempo, "HitsMB%d", i+1) ;
113 new( (*fQAHitsMulB)[i]) AliPHOSQAIntCheckable(tempo) ;
114 sprintf(tempo, "TotEnB%d", i+1) ;
115 new( (*fQATotEnerB)[i] ) AliPHOSQAFloatCheckable(tempo) ;
118 AliPHOSQAMeanChecker * hmc = new AliPHOSQAMeanChecker("HitsMul", 100. ,25.) ;
119 AliPHOSQAMeanChecker * emc = new AliPHOSQAMeanChecker("TotEner", 10. ,5.) ;
120 AliPHOSQAMeanChecker * bhmc = new AliPHOSQAMeanChecker("HitsMulB", 100. ,5.) ;
121 AliPHOSQAMeanChecker * bemc = new AliPHOSQAMeanChecker("TotEnerB", 2. ,.5) ;
123 // associate checkables and checkers
124 fQAHitsMul->AddChecker(hmc) ;
125 fQATotEner->AddChecker(emc) ;
126 for ( i = 0 ; i < nb ; i++ ) {
127 ((AliPHOSQAIntCheckable*)(*fQAHitsMulB)[i])->AddChecker(bhmc) ;
128 ((AliPHOSQAFloatCheckable*)(*fQATotEnerB)[i])->AddChecker(bemc) ;
132 //____________________________________________________________________________
133 AliPHOSv1::~AliPHOSv1()
144 //____________________________________________________________________________
145 void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits)
147 // Add a hit to the hit list.
148 // A PHOS hit is the sum of all hits in a single crystal
149 // or in a single PPSD gas cell
154 Bool_t deja = kFALSE ;
155 AliPHOSGeometry * geom = GetGeometry() ;
157 newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ;
159 for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) {
160 curHit = (AliPHOSHit*) (*fHits)[hitCounter] ;
161 if(curHit->GetPrimary() != primary) break ; // We add hits with the same primary, while GEANT treats primaries succesively
162 if( *curHit == *newHit ) {
163 *curHit = *curHit + *newHit ;
169 new((*fHits)[fNhits]) AliPHOSHit(*newHit) ;
170 // get the block Id number
171 Int_t * relid = new Int_t[geom->GetNModules()] ;
172 geom->AbsToRelNumbering(Id, relid) ;
173 // and fill the relevant QA checkable (only if in PbW04)
174 if ( relid[1] == 0 ) {
175 fQAHitsMul->Update(1) ;
176 ((AliPHOSQAIntCheckable*)(*fQAHitsMulB)[relid[0]-1])->Update(1) ;
185 //____________________________________________________________________________
186 void AliPHOSv1::FinishPrimary()
188 // called at the end of each track (primary) by AliRun
189 // hits are reset for each new track
190 // accumulate the total hit-multiplicity
192 // fQAHitsMul->Update( fHits->GetEntriesFast() ) ;
196 //____________________________________________________________________________
197 void AliPHOSv1::FinishEvent()
199 // called at the end of each event by AliRun
200 // accumulate the hit-multiplicity and total energy per block
201 // if the values have been updated check it
204 if ( fQATotEner->HasChanged() ) {
205 fQATotEner->CheckMe() ;
206 fQATotEner->Reset() ;
211 if ( fQAHitsMulB && fQATotEnerB ) {
212 for (i = 0 ; i < GetGeometry()->GetNModules() ; i++) {
213 AliPHOSQAIntCheckable * ci = (AliPHOSQAIntCheckable*)(*fQAHitsMulB)[i] ;
214 AliPHOSQAFloatCheckable* cf = (AliPHOSQAFloatCheckable*)(*fQATotEnerB)[i] ;
215 if ( ci->HasChanged() ) {
219 if ( cf->HasChanged() ) {
226 // check the total multiplicity
229 if ( fQAHitsMul->HasChanged() ) {
230 fQAHitsMul->CheckMe() ;
231 fQAHitsMul->Reset() ;
236 //____________________________________________________________________________
237 void AliPHOSv1::StepManager(void)
239 // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
241 Int_t relid[4] ; // (box, layer, row, column) indices
242 Int_t absid ; // absolute cell ID number
243 Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
244 TLorentzVector pos ; // Lorentz vector of the track current position
247 Int_t tracknumber = gAlice->CurrentTrack() ;
248 Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
249 TString name = GetGeometry()->GetName() ;
252 if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD
254 if( gMC->CurrentVolID(copy) == gMC->VolId("PPCE") ) // We are inside a gas cell
256 gMC->TrackPosition(pos) ;
260 xyze[3] = gMC->Edep() ;
262 if ( xyze[3] != 0 ) { // there is deposited energy
263 gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number
264 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){
265 relid[0] += GetGeometry()->GetNModules() - GetGeometry()->GetNPPSDModules();
267 gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
268 // 1-> GetGeometry()->GetNumberOfModulesPhi() * GetGeometry()->GetNumberOfModulesZ() upper
269 // > GetGeometry()->GetNumberOfModulesPhi() * GetGeometry()->GetNumberOfModulesZ() lower
270 gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell
271 gMC->CurrentVolID(relid[3]) ; // get the column number
273 // get the absolute Id number
275 GetGeometry()->RelToAbsNumbering(relid, absid) ;
277 // add current hit to the hit list
278 AddHit(fIshunt, primary, tracknumber, absid, xyze);
281 } // there is deposited energy
282 } // We are inside the gas of the CPV
283 } // GPS2 configuration
285 if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one
287 // Yuri Kharlov, 28 September 2000
289 if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") &&
290 (gMC->IsTrackEntering() ) &&
291 gMC->TrackCharge() != 0) {
293 gMC -> TrackPosition(pos);
294 Float_t xyzm[3], xyzd[3] ;
296 for (i=0; i<3; i++) xyzm[i] = pos[i];
297 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
299 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
305 // Current momentum of the hit's track in the local ref. system
306 TLorentzVector pmom ; //momentum of the particle initiated hit
307 gMC -> TrackMomentum(pmom);
308 Float_t pm[3], pd[3];
309 for (i=0; i<3; i++) pm[i] = pmom[i];
310 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
315 // Digitize the current CPV hit:
317 // 1. find pad response and
320 gMC->CurrentVolOffID(3,moduleNumber);
324 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
325 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
330 Int_t idigit,ndigits;
332 // 2. go through the current digit list and sum digits in pads
334 ndigits = cpvDigits->GetEntriesFast();
335 for (idigit=0; idigit<ndigits-1; idigit++) {
336 AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
337 Float_t x1 = cpvDigit1->GetXpad() ;
338 Float_t z1 = cpvDigit1->GetYpad() ;
339 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
340 AliPHOSCPVDigit *cpvDigit2 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
341 Float_t x2 = cpvDigit2->GetXpad() ;
342 Float_t z2 = cpvDigit2->GetYpad() ;
343 if (x1==x2 && z1==z2) {
344 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
345 cpvDigit2->SetQpad(qsum) ;
346 cpvDigits->RemoveAt(idigit) ;
350 cpvDigits->Compress() ;
352 // 3. add digits to temporary hit list fTmpHits
354 ndigits = cpvDigits->GetEntriesFast();
355 for (idigit=0; idigit<ndigits; idigit++) {
356 AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
357 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
358 relid[1] =-1 ; // means CPV
359 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
360 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
362 // get the absolute Id number
363 GetGeometry()->RelToAbsNumbering(relid, absid) ;
365 // add current digit to the temporary hit list
369 xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
370 primary = -1; // No need in primary for CPV
371 AddHit(fIshunt, primary, tracknumber, absid, xyze);
373 if (cpvDigit->GetQpad() > 0.02) {
374 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
375 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
376 qsum += cpvDigit->GetQpad();
381 } // end of IHEP configuration
384 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
385 gMC->TrackPosition(pos) ;
389 xyze[3] = gMC->Edep() ;
392 if ( xyze[3] != 0 ) { // Track is inside the crystal and deposits some energy
394 gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
396 // fill the relevant QA Checkables
397 fQATotEner->Update( xyze[3] ) ; // total energy in PHOS
398 ((AliPHOSQAFloatCheckable*)(*fQATotEnerB)[relid[0]-1])->Update( xyze[3] ) ; // energy in this block
400 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 )
401 relid[0] += GetGeometry()->GetNModules() - GetGeometry()->GetNPPSDModules();
403 relid[1] = 0 ; // means PBW04
404 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
405 gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
407 // get the absolute Id number
408 GetGeometry()->RelToAbsNumbering(relid, absid) ;
410 // add current hit to the hit list
411 AddHit(fIshunt, primary,tracknumber, absid, xyze);
414 } // there is deposited energy
415 } // we are inside a PHOS Xtal
418 //____________________________________________________________________________
419 void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits)
421 // ------------------------------------------------------------------------
422 // Digitize one CPV hit:
423 // On input take exact 4-momentum p and position zxhit of the hit,
424 // find the pad response around this hit and
425 // put the amplitudes in the pads into array digits
427 // Author: Yuri Kharlov (after Serguei Sadovsky)
429 // ------------------------------------------------------------------------
431 const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad)
432 const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e-
433 const Float_t kdEdx = 4.0; // Average energy loss in CPV;
434 const Int_t kNgamz = 5; // Ionization size in Z
435 const Int_t kNgamx = 9; // Ionization size in Phi
436 const Float_t kNoise = 0.03; // charge noise in one pad
440 // Just a reminder on axes notation in the CPV module:
441 // axis Z goes along the beam
442 // axis X goes across the beam in the module plane
443 // axis Y is a normal to the module plane showing from the IP
445 Float_t hitX = zxhit[0];
446 Float_t hitZ =-zxhit[1];
449 Float_t pNorm = p.Py();
450 Float_t eloss = kdEdx;
452 // cout << "CPVDigitize: YVK : "<<hitX<<" "<<hitZ<<" | "<<pX<<" "<<pZ<<" "<<pNorm<<endl;
454 Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness();
455 Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness();
456 gRandom->Rannor(rnor1,rnor2);
457 eloss *= (1 + kDetR*rnor1) *
458 TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2)));
459 Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2;
460 Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2;
461 Float_t zhit2 = zhit1 + dZY;
462 Float_t xhit2 = xhit1 + dXY;
464 Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in"
465 Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out"
469 if (iwht1==iwht2) { // incline 1-wire hit
471 zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2;
472 zxe[1][0] = (iwht1 + 0.5) * kCelWr;
474 zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2;
475 zxe[1][1] = (iwht1 + 0.5) * kCelWr;
478 else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit
480 Int_t iwht3 = (iwht1 + iwht2) / 2;
481 Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1
482 Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2
483 Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3
484 Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13
485 Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23
486 Float_t dxw1 = xhit1 - xwr13;
487 Float_t dxw2 = xhit2 - xwr23;
488 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
489 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
490 Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr );
491 zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2;
493 zxe[2][0] = eloss * egm1;
494 zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2;
496 zxe[2][1] = eloss * egm2;
497 zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1;
499 zxe[2][2] = eloss * egm3;
501 else { // incline 2-wire hit
503 Float_t xwht1 = (iwht1 + 0.5) * kCelWr;
504 Float_t xwht2 = (iwht2 + 0.5) * kCelWr;
505 Float_t xwr12 = (xwht1 + xwht2) / 2;
506 Float_t dxw1 = xhit1 - xwr12;
507 Float_t dxw2 = xhit2 - xwr12;
508 Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
509 Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) );
510 zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2;
512 zxe[2][0] = eloss * egm1;
513 zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2;
515 zxe[2][1] = eloss * egm2;
518 // Finite size of ionization region
520 Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ();
521 Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi();
522 Int_t nz3 = (kNgamz+1)/2;
523 Int_t nx3 = (kNgamx+1)/2;
524 cpvDigits->Expand(nIter*kNgamx*kNgamz);
525 TClonesArray &ldigits = *(TClonesArray *)cpvDigits;
527 for (Int_t iter=0; iter<nIter; iter++) {
529 Float_t zhit = zxe[0][iter];
530 Float_t xhit = zxe[1][iter];
531 Float_t qhit = zxe[2][iter];
532 Float_t zcell = zhit / GetGeometry()->GetPadSizeZ();
533 Float_t xcell = xhit / GetGeometry()->GetPadSizePhi();
534 if ( zcell<=0 || xcell<=0 ||
535 zcell>=nCellZ || xcell>=nCellX) return;
536 Int_t izcell = (Int_t) zcell;
537 Int_t ixcell = (Int_t) xcell;
538 Float_t zc = zcell - izcell - 0.5;
539 Float_t xc = xcell - ixcell - 0.5;
540 for (Int_t iz=1; iz<=kNgamz; iz++) {
541 Int_t kzg = izcell + iz - nz3;
542 if (kzg<=0 || kzg>nCellZ) continue;
543 Float_t zg = (Float_t)(iz-nz3) - zc;
544 for (Int_t ix=1; ix<=kNgamx; ix++) {
545 Int_t kxg = ixcell + ix - nx3;
546 if (kxg<=0 || kxg>nCellX) continue;
547 Float_t xg = (Float_t)(ix-nx3) - xc;
549 // Now calculate pad response
550 Float_t qpad = CPVPadResponseFunction(qhit,zg,xg);
551 qpad += kNoise*rnor2;
552 if (qpad<0) continue;
554 // Fill the array with pad response ID and amplitude
555 new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad);
561 //____________________________________________________________________________
562 Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) {
563 // ------------------------------------------------------------------------
564 // Calculate the amplitude in one CPV pad using the
565 // cumulative pad response function
566 // Author: Yuri Kharlov (after Serguei Sadovski)
568 // ------------------------------------------------------------------------
570 Double_t dz = GetGeometry()->GetPadSizeZ() / 2;
571 Double_t dx = GetGeometry()->GetPadSizePhi() / 2;
572 Double_t z = zhit * GetGeometry()->GetPadSizeZ();
573 Double_t x = xhit * GetGeometry()->GetPadSizePhi();
574 Double_t amplitude = qhit *
575 (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) -
576 CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx));
577 return (Float_t)amplitude;
580 //____________________________________________________________________________
581 Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) {
582 // ------------------------------------------------------------------------
583 // Cumulative pad response function
584 // It includes several terms from the CF decomposition in electrostatics
585 // Note: this cumulative function is wrong since omits some terms
586 // but the cell amplitude obtained with it is correct because
587 // these omitting terms cancel
588 // Author: Yuri Kharlov (after Serguei Sadovski)
590 // ------------------------------------------------------------------------
592 const Double_t kA=1.0;
593 const Double_t kB=0.7;
595 Double_t r2 = x*x + y*y;
597 Double_t cumulPRF = 0;
598 for (Int_t i=0; i<=4; i++) {
599 Double_t b1 = (2*i + 1) * kB;
600 cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) );
602 cumulPRF *= kA/(2*TMath::Pi());