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>
32 // --- AliRoot header files
33 #include "AliZDCMerger.h"
35 #include "AliZDCHit.h"
36 #include "AliZDCMergedHit.h"
37 #include "AliZDCDigit.h"
38 #include "AliZDCFragment.h"
40 #include "AliDetector.h"
41 #include "AliHeader.h"
42 #include "AliGenEventHeader.h"
43 #include "AliGenHijingEventHeader.h"
45 ClassImp(AliZDCMerger)
47 //int comp(const void *i,const void *j) {return *(int *)i - *(int *)j;}
49 //____________________________________________________________________________
50 AliZDCMerger::AliZDCMerger()
52 // Default constructor
53 //fMerge = kDigitize -> Only digitization
54 //fMerge = kMerge -> Digitization + Merging
73 //____________________________________________________________________________
74 AliZDCMerger::~AliZDCMerger()
77 if (fSpecnFile) delete fSpecnFile;
78 if (fSpecpFile) delete fSpecpFile;
81 //____________________________________________________________________________
82 void AliZDCMerger::InitMerging()
84 // Hits tree, impact parameter, num. of spectators n & p
85 // in background (full Hijing) event
87 Background(b, fSpecn, fSpecp);
89 // Production of nuclear fragments -> num. of FREE spectators n & p
90 Fragmentation(b, fSpecn, fSpecp, fFreeSpn, fFreeSpp);
92 // Extract from spectators distribution the signal events:
93 // NFreeSpectatorN spectator n & NFreeSpectatorP spectator p
97 //____________________________________________________________________________
98 void AliZDCMerger::Background(Float_t &fImpPar, Int_t &fSpecn, Int_t &fSpecp)
101 // --- Open the background file
102 if (fMerge && !fBgrFile) fBgrFile = OpenBgrFile();
104 // --- Read from the TreeE impact parameter (b),
105 // # of spectators n and p (fSpecn, fSpecp)
108 // // Get AliRun object from file or create it if not on file
109 // gAlice = (AliRun*)fBgrFile->Get("gAlice");
111 // gAlice = (AliRun*)fBgrFile->Get("gAlice");
112 // if (gAlice) printf("AliRun object found on file\n");
114 // printf("\n create new gAlice object");
115 // gAlice = new AliRun("gAlice","Alice test program");
119 // gAlice->GetEvent(fNEvBgr); this is done in the steering macro
120 AliHeader *header = gAlice->GetHeader();
121 AliGenEventHeader* mcHeader = header->GenEventHeader();
122 fImpPar = ((AliGenHijingEventHeader*) mcHeader)->ImpactParameter();
123 Int_t dSpecn = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsn();
124 Int_t dSpecp = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsp();
125 // Until there is only 1 ZDC set the # of spectators must be divided by 2!!!
128 printf("\n HIJING ev. #%d - b = %f fm, Nspecn = %d, Nspecp = %d\n",
129 fNEvBgr,fImpPar,fSpecn,fSpecp);
132 //____________________________________________________________________________
133 TFile* AliZDCMerger::OpenBgrFile()
135 // Initialise background event
136 TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject(fFnBgr);
137 if(!file)cerr<<"AliZDCMerger: background file "<<fFnBgr<<" not found\n";
138 // TFile *file = new TFile(fFnBgr,"UPDATE");
139 printf("\n AliZDCMerger --- Background event -> %s file opened \n", fFnBgr);
140 fHitsBgr = new TClonesArray("AliZDCHit",1000);
141 fMHits = new TClonesArray("AliZDCMergedHit",1000);
145 //____________________________________________________________________________
146 void AliZDCMerger::Fragmentation(Float_t fImpPar, Int_t fSpecn, Int_t fSpecp,
147 Int_t &fFreeSpn, Int_t &fFreeSpp)
149 //printf("\n Fragmentation -> fSpecn = %d, fSpecp = %d\n",fSpecn,fSpecp);
150 Int_t j, zz[100], nn[100], nAlpha, Ztot, Ntot;
151 AliZDCFragment *frag = new AliZDCFragment(fImpPar);
152 for(j=0; j<=99; j++){
157 // Fragments generation
158 frag->GenerateIMF(zz, nAlpha);
163 frag->AttachNeutrons(zz, nn, Ztot, Ntot);
164 fFreeSpn = fSpecn-Ntot-2*nAlpha;
165 fFreeSpp = fSpecp-Ztot-2*nAlpha;
166 if(fFreeSpn<0) fFreeSpn=0;
167 if(fFreeSpp<0) fFreeSpp=0;
168 //printf("\n 2*nAlpha = %d, Ztot = %d, Ntot = %d\n",2*nAlpha, Ztot, Ntot);
169 printf("\n Fragmentation -> FreeSpn = %d, FreeSpp = %d\n",fFreeSpn,fFreeSpp);
172 //____________________________________________________________________________
173 void AliZDCMerger::Mixing()
176 //printf("\n AliZDCMerger->Mixing\n");
178 // ### Background event Hits ###########################################
182 AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
183 // if(ZDC) printf("\n Ho trovato lo ZDC!\n");
185 // fNEvBgr = 0; // Let's suppose to have 1 full Hijing event per file
187 char treeBgrName[20];
188 sprintf(treeBgrName,"TreeH%d",fNEvBgr);
189 fTrHBgr = (TTree*)gDirectory->Get(treeBgrName);
191 printf("\n ERROR -> Can't find TreeH%d in background file\n",fNEvBgr);
198 sprintf(branchname,"%s",ZDC->GetName());
199 if(fTrHBgr && fHitsBgr){
200 // printf("\n fTrHBgr!=0 && fHitsBgr!=0\n");
201 branch = fTrHBgr->GetBranch(branchname);
202 if(branch) branch->SetAddress(&fHitsBgr);
205 Int_t ntracks = (Int_t) fTrHBgr->GetEntries();
206 //printf("\n --- ntracks = %d\n\n", ntracks);
208 Int_t itrack, nhits, ihit, j, sector[2];
210 AliZDCMergedHit *MHit;
212 TClonesArray &sdigits = *fMHits; // SDigits TCArray
216 for(itrack=0; itrack<ntracks; itrack++){
217 fTrHBgr->GetEvent(itrack);
219 nhits = fHitsBgr->GetEntries();
220 // printf(" nhits = %d \n", nhits);
221 for(ihit=0; ihit<nhits; ihit++){
222 zdcHit = (AliZDCHit*) fHitsBgr->UncheckedAt(ihit);
224 for(j=0; j<2; j++) sector[j] = zdcHit->GetVolume(j);
225 MHits[0] = zdcHit->GetPrimKinEn();
226 MHits[1] = zdcHit->GetXImpact();
227 MHits[2] = zdcHit->GetYImpact();
228 MHits[3] = zdcHit->GetSFlag();
229 MHits[4] = zdcHit->GetLightPMQ();
230 MHits[5] = zdcHit->GetLightPMC();
231 MHits[6] = zdcHit->GetEnergy();
232 MHit = new AliZDCMergedHit(sector, MHits);
234 new((*fMHits)[fNMhits]) AliZDCMergedHit(*MHit);
235 new (sdigits[fNMhits]) AliZDCMergedHit(*MHit);
241 //printf(" fNMhits (after bckg) = %d, \n",fNMhits);
243 // ### Signal event Hits ###########################################
249 //printf(" fNMhits (after signal) = %d \n",fNMhits);
253 //____________________________________________________________________________
254 void AliZDCMerger::ExtractSignal(Int_t SpecType)
257 // printf("\n Entering in Extract Signal\n");
260 if(SpecType == 1){ // --- Signal for spectator neutrons
261 fFnSpecn = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZNsignalntu.root");
262 fSpecnFile = TFile::Open(fFnSpecn,"R");
264 printf("\n --- ExtractSignal x n: file %s opened\n", fFnSpecn);
265 NumEvents = fFreeSpn;
267 else if(SpecType == 2){ // --- Signal for spectator protons
268 fFnSpecp = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZPsignalntu.root");
269 fSpecpFile = TFile::Open(fFnSpecp,"R");
271 printf("\n --- ExtractSignal x p: file %s opened\n", fFnSpecp);
272 NumEvents = fFreeSpp;
274 //printf("\n # of free spectators = %d\n", NumEvents);
275 //printf("\n fNMhits (before adding signal) = %d\n",fNMhits);
277 TNtuple *ZDCSignal = (TNtuple*) gDirectory->Get("ZDCSignal");
278 Int_t nentries = (Int_t) ZDCSignal->GetEntries();
279 //printf("\n # entries = %d\n", nentries);
281 AliZDCMergedHit *MHit;
282 Float_t *entry, HitsSpec[7];
283 Int_t pl, i, j, k, iev=0, rnd[125], Volume[2];
284 for(pl=0;pl<125;pl++){
287 for(pl=0;pl<NumEvents;pl++){
288 rnd[pl] = (Int_t) (9999*gRandom->Rndm());
289 if(rnd[pl] >= 9998) rnd[pl] = 9997;
290 //printf(" rnd[%d] = %d\n",pl,rnd[pl]);
292 // Sorting vector in ascending order with C function QSORT
293 qsort((void*)rnd,NumEvents,sizeof(Int_t),comp);
294 //for(pl=0;pl<NumEvents;pl++){
295 ////printf(" rnd[%d] = %d\n",pl,rnd[pl]);
298 for(i=0; i<nentries; i++){
299 ZDCSignal->GetEvent(i);
300 entry = ZDCSignal->GetArgs();
301 if(entry[0] == rnd[iev]){
302 for(k=0; k<2; k++) Volume[k] = (Int_t) entry[k+1];
304 HitsSpec[j] = entry[j+3];
306 //printf("\n i = %d, iev = %d, entry[0] = %f, rnd[%d] = %d ",i,iev,entry[0],iev,rnd[iev]);
307 MHit = new AliZDCMergedHit(Volume, HitsSpec);
308 new((*fMHits)[fNMhits++]) AliZDCMergedHit(*MHit);
311 else if(entry[0] > rnd[iev]){
316 }while(iev<NumEvents);
319 //printf("\n fNMhits (after n signal) = %d\n",fNMhits);
322 else if(SpecType == 2){
323 //printf("\n fNMhits (after p signal) = %d\n",fNMhits);
329 //____________________________________________________________________________
330 void AliZDCMerger::Digitize(Int_t fNMhits, TClonesArray *fMHits)
333 printf("\n AliZDCMerger->Digitize()");
335 AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
336 // if(ZDC) printf("\n Ho trovato lo ZDC!\n");
337 Int_t lightQ, lightC, sector[2], digit;
338 Int_t PMCZN = 0, PMCZP = 0, PMQZN[4], PMQZP[4], PMZEM1 = 0, PMZEM2 = 0;
345 AliZDCMergedHit *MHit;
347 printf(" fNMHits = %d\n", fNMhits);
349 for(imhit=0; imhit<fNMhits; imhit++){
351 MHit = (AliZDCMergedHit*) fMHits->UncheckedAt(imhit);
352 sector[0] = MHit->GetSector(0);
353 sector[1] = MHit->GetSector(1);
354 // tmp -> c'erano i quadranti cannati!
355 if((sector[1]!=1) && (sector[1]!=2) && (sector[1]!=3) && (sector[1]!=4)){
356 printf("\n *** ERROR!!! sector[0] = %d, sector[1] = %d\n",
357 sector[0], sector[1]);
360 lightQ = Int_t(MHit->GetLightPMQ());
361 lightC = Int_t(MHit->GetLightPMC());
362 // printf(" imhit = %d -> DET. = %d, quad = %d,PMQ = %d, PMC = %d\n",
363 // imhit,sector[0], sector[1],lightQ, lightC);
365 if(sector[0] == 1){ //ZN
366 PMCZN = PMCZN + lightC;
367 PMQZN[sector[1]-1] = PMQZN[sector[1]-1] + lightQ;
369 else if(sector[0] == 2){ //ZP
370 PMCZP = PMCZP + lightC;
371 PMQZP[sector[1]-1] = PMQZP[sector[1]-1] + lightQ;
373 else if(sector[0] == 3){ //ZEM
374 if(sector[1] ==1) PMZEM1 = PMZEM1 + lightC;
375 else PMZEM2 = PMZEM2 + lightQ;
379 // ### Digits creation ###############################################
380 // Create digits for ZN
382 sector[0] = 1; // Detector = ZN
383 sector[1] = 0; // Common PM ADC
384 digit = Phe2ADCch(1, 0, PMCZN);
385 printf("\n\n ZN ### PMCZN = %d ADCZN = %d",PMCZN, digit);
386 PedValue = AddPedestal();
388 // printf(" PedValue = %d",PedValue);
389 ZDC->AddDigit(sector, digit);
392 sector[1] = j+1; // Towers PM ADCs
393 digit = Phe2ADCch(1, j+1, PMQZN[j]);
394 printf("\n PMQZN[%d] = %d phe ADCZN[%d] = %d ADCch",j,PMQZN[j],j,digit);
395 PedValue = AddPedestal();
397 // printf(" PedValue = %d",PedValue);
398 ZDC->AddDigit(sector, digit);
402 // Create digits for ZP
403 sector[0] = 2; // Detector = ZP
404 sector[1] = 0; // Common PM ADC
405 digit = Phe2ADCch(2, 0, PMCZP);
406 printf("\n ZP --- PMCZP = %d phe ADCZP = %d ADCch",PMCZP,digit);
407 PedValue = AddPedestal();
409 // printf(" PedValue = %d",PedValue);
410 ZDC->AddDigit(sector, digit);
412 sector[1] = j+1; // Towers PM ADCs
413 digit = Phe2ADCch(2, j+1, PMQZP[j]);
414 printf("\n PMQZP[%d] = %d phe ADCZP[%d] = %d ADCch",j,PMQZP[j],j,digit);
415 PedValue = AddPedestal();
417 // printf(" PedValue = %d",PedValue);
418 ZDC->AddDigit(sector, digit);
422 // Create digits for ZEM
424 sector[1] = 1; // Detector = ZEM1
425 digit = Phe2ADCch(3, 1, PMZEM1);
426 printf("\n ZEM *** PMZEM1 = %d phe ADCZEM1 = %d ADCch",PMZEM1,digit);
427 PedValue = AddPedestal();
429 // printf(" PedValue = %d\n",PedValue);
430 ZDC->AddDigit(sector, digit);
431 sector[1] = 2; // Detector = ZEM2
432 digit = Phe2ADCch(3, 2, PMZEM2);
433 printf("\n ZEM *** PMZEM2 = %d phe ADCZEM2 = %d ADCch\n",PMZEM2,digit);
434 PedValue = AddPedestal();
436 // printf(" PedValue = %d\n",PedValue);
437 ZDC->AddDigit(sector, digit);
440 //_____________________________________________________________________________
441 Int_t AliZDCMerger::Phe2ADCch(Int_t Det, Int_t Quad, Int_t Light)
443 // Evaluation of the ADC channel corresponding to the light yield Light
445 if(gAlice->GetDebug() > 0){
446 // printf("\n Phe2ADCch -> Detector = %d, Quadrant = %d, Light = %d\n", Det, Quad, Light);
454 fPMGain[i][j] = 100000.;
457 fADCRes = 0.00000064; // ADC Resolution: 250 fC/ADCch
459 ADCch = (Int_t) (Light*fPMGain[Det-1][Quad]*fADCRes);
464 //_____________________________________________________________________________
465 Int_t AliZDCMerger::AddPedestal()
467 // --- Pedestal value -> extracted from a gaussian distribution
468 // obtained from the beam test on the ZEM prototype (Aug. 2000)
471 Float_t PedMean = 50.;
472 Float_t PedWidth = 5.;
474 PedValue = (Int_t) gRandom->Gaus(PedMean,PedWidth);