1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
17 ///////////////////////////////////////////////////////////////////////////////
19 // ZDC event merging class //
21 ///////////////////////////////////////////////////////////////////////////////
27 #include <TDirectory.h>
31 // --- AliRoot header files
32 #include "AliZDCMerger.h"
34 #include "AliZDCHit.h"
35 #include "AliZDCMergedHit.h"
36 #include "AliZDCDigit.h"
37 #include "AliZDCFragment.h"
39 #include "AliDetector.h"
40 #include "AliHeader.h"
41 #include "AliGenEventHeader.h"
42 #include "AliGenHijingEventHeader.h"
44 ClassImp(AliZDCMerger)
46 //int comp(const void *i,const void *j) {return *(int *)i - *(int *)j;}
48 //____________________________________________________________________________
49 AliZDCMerger::AliZDCMerger()
51 // Default constructor
52 //fMerge = kDigitize -> Only digitization
53 //fMerge = kMerge -> Digitization + Merging
75 //____________________________________________________________________________
76 AliZDCMerger::~AliZDCMerger()
79 if (fBgrFile) delete fBgrFile;
80 if (fTrHBgr) delete fTrHBgr;
81 if (fTrSDBgr) delete fTrSDBgr;
82 if (fHitsBgr) delete fHitsBgr;
83 if (fSpecnFile) delete fSpecnFile;
84 if (fSpecpFile) delete fSpecpFile;
87 //____________________________________________________________________________
88 void AliZDCMerger::InitMerging()
90 // Hits tree, impact parameter, num. of spectators n & p
91 // in background (full Hijing) event
93 Background(b, fSpecn, fSpecp);
95 // Production of nuclear fragments -> num. of FREE spectators n & p
96 Fragmentation(b, fSpecn, fSpecp, fFreeSpn, fFreeSpp);
98 // Extract from spectators distribution the signal events:
99 // NFreeSpectatorN spectator n & NFreeSpectatorP spectator p
103 //____________________________________________________________________________
104 void AliZDCMerger::Background(Float_t &fImpPar, Int_t &fSpecn, Int_t &fSpecp)
107 // --- Open the background file
108 if (fMerge && !fBgrFile) fBgrFile = OpenBgrFile();
110 // --- Read from the TreeE impact parameter (b),
111 // # of spectators n and p (fSpecn, fSpecp)
114 // // Get AliRun object from file or create it if not on file
115 // gAlice = (AliRun*)fBgrFile->Get("gAlice");
117 // gAlice = (AliRun*)fBgrFile->Get("gAlice");
118 // if (gAlice) printf("AliRun object found on file\n");
120 // printf("\n create new gAlice object");
121 // gAlice = new AliRun("gAlice","Alice test program");
125 gAlice->GetEvent(fNEvBgr);
126 AliHeader *header = gAlice->GetHeader();
127 AliGenEventHeader* mcHeader = header->GenEventHeader();
128 fImpPar = ((AliGenHijingEventHeader*) mcHeader)->ImpactParameter();
129 Int_t dSpecn = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsn();
130 Int_t dSpecp = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsp();
131 // Until there is only 1 ZDC set the # of spectators must be divided by 2!!!
134 printf("\n HIJING ev. #%d - b = %f fm, Nspecn = %d, Nspecp = %d\n",
135 fNEvBgr,fImpPar,fSpecn,fSpecp);
138 //____________________________________________________________________________
139 TFile* AliZDCMerger::OpenBgrFile()
141 // Initialise background event
142 TFile *file = new TFile(fFnBgr,"UPDATE");
143 printf("\n AliZDCMerger --- Background event -> %s file opened \n", fFnBgr);
144 fHitsBgr = new TClonesArray("AliZDCHit",1000);
145 fMHits = new TClonesArray("AliZDCMergedHit",1000);
149 //____________________________________________________________________________
150 void AliZDCMerger::Fragmentation(Float_t fImpPar, Int_t fSpecn, Int_t fSpecp,
151 Int_t &fFreeSpn, Int_t &fFreeSpp)
153 //printf("\n Fragmentation -> fSpecn = %d, fSpecp = %d\n",fSpecn,fSpecp);
154 Int_t j, zz[100], nn[100], nAlpha, Ztot, Ntot;
155 AliZDCFragment *frag = new AliZDCFragment(fImpPar);
156 for(j=0; j<=99; j++){
161 // Fragments generation
162 frag->GenerateIMF(zz, nAlpha);
167 frag->AttachNeutrons(zz, nn, Ztot, Ntot);
168 fFreeSpn = fSpecn-Ntot-2*nAlpha;
169 fFreeSpp = fSpecp-Ztot-2*nAlpha;
170 if(fFreeSpn<0) fFreeSpn=0;
171 if(fFreeSpp<0) fFreeSpp=0;
172 //printf("\n 2*nAlpha = %d, Ztot = %d, Ntot = %d\n",2*nAlpha, Ztot, Ntot);
173 printf("\n Fragmentation -> FreeSpn = %d, FreeSpp = %d\n",fFreeSpn,fFreeSpp);
176 //____________________________________________________________________________
177 void AliZDCMerger::Mixing()
180 //printf("\n AliZDCMerger->Mixing\n");
182 // ### Background event Hits ###########################################
186 AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
187 // if(ZDC) printf("\n Ho trovato lo ZDC!\n");
190 if(fTrHBgr) delete fTrHBgr;
193 if(fTrSDBgr) delete fTrSDBgr;
196 // fNEvBgr = 0; // Let's suppose to have 1 full Hijing event per file
198 char treeBgrName[20];
199 sprintf(treeBgrName,"TreeH%d",fNEvBgr);
200 fTrHBgr = (TTree*)gDirectory->Get(treeBgrName);
202 printf("\n ERROR -> Can't find TreeH%d in background file\n",fNEvBgr);
209 sprintf(branchname,"%s",ZDC->GetName());
210 if(fTrHBgr && fHitsBgr){
211 // printf("\n fTrHBgr!=0 && fHitsBgr!=0\n");
212 branch = fTrHBgr->GetBranch(branchname);
213 if(branch) branch->SetAddress(&fHitsBgr);
216 Int_t ntracks = (Int_t) fTrHBgr->GetEntries();
217 //printf("\n --- ntracks = %d\n\n", ntracks);
219 Int_t itrack, nhits, ihit, j, sector[2];
221 AliZDCMergedHit *MHit;
223 TClonesArray &sdigits = *fMHits; // SDigits TCArray
227 for(itrack=0; itrack<ntracks; itrack++){
228 fTrHBgr->GetEvent(itrack);
230 nhits = fHitsBgr->GetEntries();
231 // printf(" nhits = %d \n", nhits);
232 for(ihit=0; ihit<nhits; ihit++){
233 zdcHit = (AliZDCHit*) fHitsBgr->UncheckedAt(ihit);
235 for(j=0; j<2; j++) sector[j] = zdcHit->GetVolume(j);
236 MHits[0] = zdcHit->GetPrimKinEn();
237 MHits[1] = zdcHit->GetXImpact();
238 MHits[2] = zdcHit->GetYImpact();
239 MHits[3] = zdcHit->GetSFlag();
240 MHits[4] = zdcHit->GetLightPMQ();
241 MHits[5] = zdcHit->GetLightPMC();
242 MHits[6] = zdcHit->GetEnergy();
243 MHit = new AliZDCMergedHit(sector, MHits);
245 new((*fMHits)[fNMhits]) AliZDCMergedHit(*MHit);
246 new (sdigits[fNMhits]) AliZDCMergedHit(*MHit);
252 //printf(" fNMhits (after bckg) = %d, \n",fNMhits);
254 // ### Signal event Hits ###########################################
260 //printf(" fNMhits (after signal) = %d \n",fNMhits);
264 //____________________________________________________________________________
265 void AliZDCMerger::ExtractSignal(Int_t SpecType)
268 // printf("\n Entering in Extract Signal\n");
271 if(SpecType == 1){ // --- Signal for spectator neutrons
272 fFnSpecn = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZNsignalntu.root");
273 fSpecnFile = TFile::Open(fFnSpecn,"R");
275 printf("\n --- ExtractSignal x n: file %s opened\n", fFnSpecn);
276 NumEvents = fFreeSpn;
278 else if(SpecType == 2){ // --- Signal for spectator protons
279 fFnSpecp = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZPsignalntu.root");
280 fSpecpFile = TFile::Open(fFnSpecp,"R");
282 printf("\n --- ExtractSignal x p: file %s opened\n", fFnSpecp);
283 NumEvents = fFreeSpp;
285 //printf("\n # of free spectators = %d\n", NumEvents);
286 //printf("\n fNMhits (before adding signal) = %d\n",fNMhits);
288 TNtuple *ZDCSignal = (TNtuple*) gDirectory->Get("ZDCSignal");
289 Int_t nentries = (Int_t) ZDCSignal->GetEntries();
290 //printf("\n # entries = %d\n", nentries);
292 AliZDCMergedHit *MHit;
293 Float_t *entry, HitsSpec[7];
294 Int_t pl, i, j, k, iev=0, rnd[125], Volume[2];
295 for(pl=0;pl<125;pl++){
298 for(pl=0;pl<NumEvents;pl++){
299 rnd[pl] = (Int_t) (9999*gRandom->Rndm());
300 if(rnd[pl] >= 9998) rnd[pl] = 9997;
301 //printf(" rnd[%d] = %d\n",pl,rnd[pl]);
303 // Sorting vector in ascending order with C function QSORT
304 qsort((void*)rnd,NumEvents,sizeof(Int_t),comp);
305 //for(pl=0;pl<NumEvents;pl++){
306 ////printf(" rnd[%d] = %d\n",pl,rnd[pl]);
309 for(i=0; i<nentries; i++){
310 ZDCSignal->GetEvent(i);
311 entry = ZDCSignal->GetArgs();
312 if(entry[0] == rnd[iev]){
313 for(k=0; k<2; k++) Volume[k] = (Int_t) entry[k+1];
315 HitsSpec[j] = entry[j+3];
317 //printf("\n i = %d, iev = %d, entry[0] = %f, rnd[%d] = %d ",i,iev,entry[0],iev,rnd[iev]);
318 MHit = new AliZDCMergedHit(Volume, HitsSpec);
319 new((*fMHits)[fNMhits++]) AliZDCMergedHit(*MHit);
322 else if(entry[0] > rnd[iev]){
327 }while(iev<NumEvents);
330 //printf("\n fNMhits (after n signal) = %d\n",fNMhits);
333 else if(SpecType == 2){
334 //printf("\n fNMhits (after p signal) = %d\n",fNMhits);
340 //____________________________________________________________________________
341 void AliZDCMerger::Digitize(Int_t fNMhits, TClonesArray *fMHits)
344 printf("\n AliZDCMerger->Digitize()");
346 AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
347 // if(ZDC) printf("\n Ho trovato lo ZDC!\n");
349 Int_t lightQ, lightC, sector[2], digit;
350 Int_t PMCZN = 0, PMCZP = 0, PMQZN[4], PMQZP[4], PMZEM1 = 0, PMZEM2 = 0;
357 AliZDCMergedHit *MHit;
359 printf(" fNMHits = %d\n", fNMhits);
361 for(imhit=0; imhit<fNMhits; imhit++){
363 MHit = (AliZDCMergedHit*) fMHits->UncheckedAt(imhit);
364 sector[0] = MHit->GetSector(0);
365 sector[1] = MHit->GetSector(1);
366 // tmp -> c'erano i quadranti cannati!
367 if((sector[1]!=1) && (sector[1]!=2) && (sector[1]!=3) && (sector[1]!=4)){
368 printf("\n *** ERROR!!! sector[0] = %d, sector[1] = %d\n",
369 sector[0], sector[1]);
372 lightQ = Int_t(MHit->GetLightPMQ());
373 lightC = Int_t(MHit->GetLightPMC());
374 // printf(" imhit = %d -> DET. = %d, quad = %d,PMQ = %d, PMC = %d\n",
375 // imhit,sector[0], sector[1],lightQ, lightC);
377 if(sector[0] == 1){ //ZN
378 PMCZN = PMCZN + lightC;
379 PMQZN[sector[1]-1] = PMQZN[sector[1]-1] + lightQ;
381 else if(sector[0] == 2){ //ZP
382 PMCZP = PMCZP + lightC;
383 PMQZP[sector[1]-1] = PMQZP[sector[1]-1] + lightQ;
385 else if(sector[0] == 3){ //ZEM
386 if(sector[1] ==1) PMZEM1 = PMZEM1 + lightC;
387 else PMZEM2 = PMZEM2 + lightQ;
391 // ### Digits creation ###############################################
392 // Create digits for ZN
394 sector[0] = 1; // Detector = ZN
395 sector[1] = 0; // Common PM ADC
396 digit = Phe2ADCch(1, 0, PMCZN);
397 printf("\n\n ZN ### PMCZN = %d ADCZN = %d",PMCZN, digit);
398 PedValue = AddPedestal();
400 // printf(" PedValue = %d",PedValue);
401 ZDC->AddDigit(sector, digit);
404 sector[1] = j+1; // Towers PM ADCs
405 digit = Phe2ADCch(1, j+1, PMQZN[j]);
406 printf("\n PMQZN[%d] = %d phe ADCZN[%d] = %d ADCch",j,PMQZN[j],j,digit);
407 PedValue = AddPedestal();
409 // printf(" PedValue = %d",PedValue);
410 ZDC->AddDigit(sector, digit);
414 // Create digits for ZP
415 sector[0] = 2; // Detector = ZP
416 sector[1] = 0; // Common PM ADC
417 digit = Phe2ADCch(2, 0, PMCZP);
418 printf("\n ZP --- PMCZP = %d phe ADCZP = %d ADCch",PMCZP,digit);
419 PedValue = AddPedestal();
421 // printf(" PedValue = %d",PedValue);
422 ZDC->AddDigit(sector, digit);
424 sector[1] = j+1; // Towers PM ADCs
425 digit = Phe2ADCch(2, j+1, PMQZP[j]);
426 printf("\n PMQZP[%d] = %d phe ADCZP[%d] = %d ADCch",j,PMQZP[j],j,digit);
427 PedValue = AddPedestal();
429 // printf(" PedValue = %d",PedValue);
430 ZDC->AddDigit(sector, digit);
434 // Create digits for ZEM
436 sector[1] = 1; // Detector = ZEM1
437 digit = Phe2ADCch(3, 1, PMZEM1);
438 printf("\n ZEM *** PMZEM1 = %d phe ADCZEM1 = %d ADCch",PMZEM1,digit);
439 PedValue = AddPedestal();
441 // printf(" PedValue = %d\n",PedValue);
442 ZDC->AddDigit(sector, digit);
443 sector[1] = 2; // Detector = ZEM2
444 digit = Phe2ADCch(3, 2, PMZEM2);
445 printf("\n ZEM *** PMZEM2 = %d phe ADCZEM2 = %d ADCch\n",PMZEM2,digit);
446 PedValue = AddPedestal();
448 // printf(" PedValue = %d\n",PedValue);
449 ZDC->AddDigit(sector, digit);
452 //_____________________________________________________________________________
453 Int_t AliZDCMerger::Phe2ADCch(Int_t Det, Int_t Quad, Int_t Light)
455 // Evaluation of the ADC channel corresponding to the light yield Light
457 if(gAlice->GetDebug() > 0){
458 // printf("\n Phe2ADCch -> Detector = %d, Quadrant = %d, Light = %d\n", Det, Quad, Light);
466 fPMGain[i][j] = 100000.;
469 fADCRes = 0.00000064; // ADC Resolution: 250 fC/ADCch
471 ADCch = (Int_t) (Light*fPMGain[Det-1][Quad]*fADCRes);
476 //_____________________________________________________________________________
477 Int_t AliZDCMerger::AddPedestal()
479 // --- Pedestal value -> extracted from a gaussian distribution
480 // obtained from the beam test on the ZEM prototype (Aug. 2000)
483 Float_t PedMean = 50.;
484 Float_t PedWidth = 5.;
486 PedValue = (Int_t) gRandom->Gaus(PedMean,PedWidth);