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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
21 // This class contains the basic functions for the Time Of Flight //
22 // detector. Functions specific to one particular geometry are //
23 // contained in the derived classes //
25 // VERSIONE WITH 5 SYMMETRIC MODULES ALONG Z AXIS
26 // ==============================================
28 // VERSION WITH HOLES FOR PHOS AND TRD IN SPACEFRAME WITH HOLES
30 // Volume sensibile : FPAD
36 <img src="picts/AliTOFClass.gif">
42 ///////////////////////////////////////////////////////////////////////////////
45 #include <Riostream.h>
46 #include <Rstrstream.h>
58 #include <TVirtualMC.h>
61 #include "AliConfig.h"
62 #include "AliHeader.h"
64 #include "AliLoader.h"
68 #include "AliTOFGeometry.h"
69 #include "AliTOFSDigit.h"
70 #include "AliTOFdigit.h"
71 #include "AliTOFhit.h"
72 #include "AliTOFhitT0.h"
74 #include "AliTOFDigitizer.h"
75 #include "AliTOFDDLRawData.h"
79 //_____________________________________________________________________________
83 // Default constructor
92 fReconParticles = 0x0;
98 //_____________________________________________________________________________
99 AliTOF::AliTOF(const char *name, const char *title, Option_t *option)
100 : AliDetector(name,title)
103 // AliTOF standard constructor
105 // Here are fixed some important parameters
108 // Initialization of hits, sdigits and digits array
109 // added option for time zero analysis
110 fFGeom = 0x0; //skowron
113 fReconParticles= 0x0;
116 if (strstr(option,"tzero")){
117 fHits = new TClonesArray("AliTOFhitT0", 1000);
119 AliWarning("tzero option requires AliTOFv4T0 as TOF version (check Your Config.C)");
121 fHits = new TClonesArray("AliTOFhit", 1000);
125 AliFatal("gAlice==0 !");
127 if (gAlice->GetMCApp()->GetHitLists())
128 gAlice->GetMCApp()->AddHitList(fHits);
129 else AliError("gAlice->GetHitLists()==0");
132 fSDigits = new TClonesArray("AliTOFSDigit", 1000);
133 fDigits = new TClonesArray("AliTOFdigit", 1000);
139 fReconParticles = 0x0;
142 // Digitization parameters
144 // (Transfer Functions to be inserted here)
151 //fGapA = 4.; //cm Gap beetween tilted strip in A-type plate
152 //fGapB = 6.; //cm Gap beetween tilted strip in B-type plate
154 // Physical performances
155 //fTimeRes = 100.;//ps
156 //fChrgRes = 100.;//pC
160 //_____________________________________________________________________________
161 void AliTOF::CreateTOFFolders()
163 // create the ALICE TFolder
164 // create the ALICE TTasks
165 // create the ALICE main TFolder
166 // to be done by AliRun
168 TFolder * alice = new TFolder();
169 alice->SetNameTitle("FPAlice", "Alice Folder") ;
170 gROOT->GetListOfBrowsables()->Add(alice) ;
172 TFolder * aliceF = alice->AddFolder("folders", "Alice memory Folder") ;
173 // make it the owner of the objects that it contains
176 TFolder * geomF = aliceF->AddFolder("Geometry", "Geometry objects") ;
177 TFolder * aliceT = alice->AddFolder("tasks", "Alice tasks Folder") ;
178 // make it the owner of the objects that it contains
181 TTask * aliceDi = new TTask("(S)Digitizer", "Alice SDigitizer & Digitizer") ;
182 aliceT->Add(aliceDi);
184 TTask * aliceRe = new TTask("Reconstructioner", "Alice Reconstructioner") ;
185 aliceT->Add(aliceRe);
187 char * tempo = new char[80] ;
189 // creates the TOF Digitizer and adds it to alice main (S)Digitizer task
190 sprintf(tempo, "%sDigitizers container",GetName() ) ;
191 fDTask = new TTask(GetName(), tempo);
192 aliceDi->Add(fDTask) ;
194 // creates the TOF reconstructioner and adds it to alice main Reconstructioner task
195 sprintf(tempo, "%sReconstructioner container",GetName() ) ;
196 fReTask = new TTask(GetName(), tempo);
197 aliceRe->Add(fReTask) ;
201 // creates the TOF geometry folder
202 geomF->AddFolder("TOF", "Geometry for TOF") ;
205 //_____________________________________________________________________________
209 // it remove also the alice folder
210 // and task that TOF creates instead of AliRun
211 /* PH Temporarily commented because of problems
212 TFolder * alice = (TFolder*)gROOT->GetListOfBrowsables()->FindObject("FPAlice") ;
236 fReconParticles->Delete ();
237 delete fReconParticles;
243 //_____________________________________________________________________________
244 void AliTOF::AddHit(Int_t track, Int_t *vol, Float_t *hits)
248 // new with placement used
250 TClonesArray &lhits = *fHits;
251 new(lhits[fNhits++]) AliTOFhit(fIshunt, track, vol, hits);
254 //_____________________________________________________________________________
255 void AliTOF::AddT0Hit(Int_t track, Int_t *vol, Float_t *hits)
259 // new with placement used
261 TClonesArray &lhits = *fHits;
262 new(lhits[fNhits++]) AliTOFhitT0(fIshunt, track, vol, hits);
265 //_____________________________________________________________________________
266 void AliTOF::AddDigit(Int_t *tracks, Int_t *vol, Float_t *digits)
270 // new with placement used
272 TClonesArray &ldigits = *fDigits;
273 new (ldigits[fNdigits++]) AliTOFdigit(tracks, vol, digits);
276 //___________________________________________
277 void AliTOF::AddSDigit(Int_t tracknum, Int_t *vol, Float_t *digits)
284 TClonesArray &lSDigits = *fSDigits;
285 new(lSDigits[fNSDigits++]) AliTOFSDigit(tracknum, vol, digits);
288 //_____________________________________________________________________________
289 void AliTOF::SetTreeAddress ()
291 // Set branch address for the Hits and Digits Tree.
293 if (fLoader->TreeH())
297 if (fTZero) fHits = new TClonesArray("AliTOFhitT0", 1000);
298 else fHits = new TClonesArray("AliTOFhit", 1000);
301 AliDetector::SetTreeAddress ();
305 if (fLoader->TreeS () )
307 branch = fLoader->TreeS ()->GetBranch ("TOF");
309 if (fSDigits == 0x0) fSDigits = new TClonesArray("AliTOFSDigit", 1000);
310 branch->SetAddress (&fSDigits);
314 if (fLoader->TreeR() && fReconParticles) //I do not know where this array is created - skowron
316 branch = fLoader->TreeR()->GetBranch("TOF");
319 branch->SetAddress(&fReconParticles) ;
324 //_____________________________________________________________________________
325 void AliTOF::CreateGeometry()
328 // Common geometry code
332 <img src="picts/AliTOFv23.gif">
336 const Double_t kPi=TMath::Pi();
337 const Double_t kDegrad=kPi/180.;
339 Float_t xTof, yTof, wall;
341 // frame inbetween TOF modules
344 // Sizes of TOF module with its support etc..
345 xTof = 2.*(AliTOFGeometry::Rmin()*TMath::Tan(10*kDegrad)-wall/2-.5);
346 yTof = AliTOFGeometry::Rmax()-AliTOFGeometry::Rmin();
348 // TOF module internal definitions
349 //TOFpc(xTof, yTof, fZlenC, fZlenB, fZlenA, AliTOFGeometry::MaxhZtof());
350 TOFpc(xTof, yTof, AliTOFGeometry::ZlenC(), AliTOFGeometry::ZlenB(), AliTOFGeometry::ZlenA(), AliTOFGeometry::MaxhZtof());
353 //_____________________________________________________________________________
354 void AliTOF::DrawModule() const
357 // Draw a shaded view of the common part of the TOF geometry
360 AliInfo(" Drawing of AliTOF");
361 // Set everything unseen
362 gMC->Gsatt("*", "seen", -1);
364 // Set ALIC mother transparent
365 gMC->Gsatt("ALIC","SEEN",0);
367 // Set the volumes visible
368 gMC->Gsatt("FTOA","SEEN",1);
369 gMC->Gsatt("FTOB","SEEN",1);
370 gMC->Gsatt("FTOC","SEEN",1);
371 gMC->Gsatt("FLTA","SEEN",1);
372 gMC->Gsatt("FLTB","SEEN",1);
373 gMC->Gsatt("FLTC","SEEN",1);
374 gMC->Gsatt("FSTR","SEEN",1);
376 gMC->Gdopt("hide", "on");
377 gMC->Gdopt("shad", "on");
378 gMC->Gsatt("*", "fill", 7);
379 gMC->SetClipBox(".");
380 gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
382 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .02, .02);
383 gMC->Gdhead(1111, "Time Of Flight");
384 gMC->Gdman(18, 4, "MAN");
385 gMC->Gdopt("hide","off");
388 //_____________________________________________________________________________
389 void AliTOF::CreateMaterials()
392 // Defines TOF materials for all versions
393 // Revision: F. Pierella 18-VI-2002
396 Int_t isxfld = gAlice->Field()->Integ();
397 Float_t sxmgmx = gAlice->Field()->Max();
399 //--- Quartz (SiO2) to simulate float glass
400 // density tuned to have correct float glass
402 Float_t aq[2] = { 28.0855,15.9994 };
403 Float_t zq[2] = { 14.,8. };
404 Float_t wq[2] = { 1.,2. };
405 Float_t dq = 2.55; // std value: 2.2
408 // --- Freon C2F4H2 (TOF-TDR pagg.)
409 // Geant Manual CONS110-1, pag. 43 (Geant, Detector Description and Simulation Tool)
410 Float_t afre[3] = {12.011,18.998,1.007};
411 Float_t zfre[3] = { 6., 9., 1.};
412 Float_t wfre[3] = { 2., 4., 2.};
413 Float_t densfre = 0.00375;
414 // http://www.fi.infn.it/sezione/prevprot/gas/freon.html
417 //-- Isobutane quencher C4H10 (5% in the sensitive mixture)
418 Float_t aiso[2] = {12.011,1.007};
419 Float_t ziso[2] = { 6., 1.};
420 Float_t wiso[2] = { 4., 10.};
421 Float_t densiso = .......; // (g/cm3) density
422 Int_t nfre = -2; // < 0 i.e. proportion by number of atoms of each kind
423 //-- SF6 (5% in the sensitive mixture)
424 Float_t asf[3] = {32.066,18.998};
425 Float_t zsf[3] = { 16., 9.};
426 Float_t wsf[3] = { 1., 6.};
427 Float_t denssf = .....; // (g/cm3) density
428 Int_t nfre = -2; // < 0 i.e. proportion by number of atoms of each kind
431 Float_t ac[2] = {12.,16.};
432 Float_t zc[2] = { 6., 8.};
433 Float_t wc[2] = { 1., 2.};
434 Float_t dc = .001977;
436 // For mylar (C5H4O2)
437 Float_t amy[3] = { 12., 1., 16. };
438 Float_t zmy[3] = { 6., 1., 8. };
439 Float_t wmy[3] = { 5., 4., 2. };
442 // For polyethilene (CH2) - honeycomb -
443 Float_t ape[2] = { 12., 1. };
444 Float_t zpe[2] = { 6., 1. };
445 Float_t wpe[2] = { 1., 2. };
446 Float_t dpe = 0.935*0.479; //To have 1%X0 for 1cm as for honeycomb
449 Float_t ag10[4] = { 12.,1.,16.,28. };
450 Float_t zg10[4] = { 6.,1., 8.,14. };
451 Float_t wmatg10[4] = { .259,.288,.248,.205 };
452 Float_t densg10 = 1.7;
455 // plexiglass CH2=C(CH3)CO2CH3
456 Float_t aplex[3] = { 12.,1.,16.};
457 Float_t zplex[3] = { 6.,1., 8.};
458 Float_t wmatplex[3] = {5.,8.,2.};
459 Float_t densplex =1.16;
462 // ---- ALUMINA (AL203)
463 Float_t aal[2] = { 27.,16.};
464 Float_t zal[2] = { 13., 8.};
465 Float_t wmatal[2] = { 2.,3. };
466 Float_t densal = 2.3;
469 Float_t awa[2] = { 1., 16. };
470 Float_t zwa[2] = { 1., 8. };
471 Float_t wwa[2] = { 2., 1. };
476 Float_t asteel[4] = { 55.847,51.9961,58.6934,28.0855 };
477 Float_t zsteel[4] = { 26.,24.,28.,14. };
478 Float_t wsteel[4] = { .715,.18,.1,.005 };
480 //AliMaterial(0, "Vacuum$", 1e-16, 1e-16, 1e-16, 1e16, 1e16);
483 Float_t aAir[4]={12.0107,14.0067,15.9994,39.948};
484 Float_t zAir[4]={6.,7.,8.,18.};
485 Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
486 Float_t dAir = 1.20479E-3;
488 AliMixture( 1, "Air$", aAir, zAir, dAir, 4, wAir);
490 AliMaterial( 2, "Cu $", 63.54, 29.0, 8.96, 1.43, 14.8);
491 AliMaterial( 3, "C $", 12.01, 6.0, 2.265,18.8, 74.4);
492 AliMixture ( 4, "Polyethilene$", ape, zpe, dpe, npe, wpe);
493 AliMixture ( 5, "G10$", ag10, zg10, densg10, nlmatg10, wmatg10);
494 AliMixture ( 6, "PLE$", aplex, zplex, densplex, nplex, wmatplex);
495 AliMixture ( 7, "CO2$", ac, zc, dc, nc, wc);
496 AliMixture ( 8, "ALUMINA$", aal, zal, densal, nlmatal, wmatal);
497 AliMaterial( 9, "Al $", 26.98, 13., 2.7, 8.9, 37.2);
498 AliMaterial(10, "C-TRD$", 12.01, 6., 2.265*18.8/69.282*15./100, 18.8, 74.4); // for 15%
499 AliMixture (11, "Mylar$", amy, zmy, dmy, nmy, wmy);
500 AliMixture (12, "Freon$", afre, zfre, densfre, nfre, wfre);
501 AliMixture (13, "Glass$", aq, zq, dq, nq, wq);
502 AliMixture (14, "Water$", awa, zwa, dwa, nwa, wwa);
503 AliMixture (15, "STAINLESS STEEL$", asteel, zsteel, 7.88, 4, wsteel);
505 Float_t epsil, stmin, deemax, stemax;
508 // EPSIL = 0.1 ! Tracking precision,
509 // STEMAX = 0.1 ! Maximum displacement for multiple scattering
510 // DEEMAX = 0.1 ! Maximum fractional energy loss, DLS
514 epsil = .001; // Tracking precision,
515 stemax = -1.; // Maximum displacement for multiple scattering
516 deemax = -.3; // Maximum fractional energy loss, DLS
519 AliMedium( 1, "Air$" , 1, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
520 AliMedium( 2, "Cu $" , 2, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
521 AliMedium( 3, "C $" , 3, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
522 AliMedium( 4, "Pol$" , 4, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
523 AliMedium( 5, "G10$" , 5, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
524 AliMedium( 6, "PLE$" , 6, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
525 AliMedium( 7, "CO2$" , 7, 0, isxfld, sxmgmx, 10., -.01, -.1, .01, -.01);
526 AliMedium( 8,"ALUMINA$", 8, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
527 AliMedium( 9,"Al Frame$",9, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
528 AliMedium(10, "DME-S$", 6, 1, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
529 AliMedium(11, "C-TRD$", 10, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
530 AliMedium(12, "Myl$" , 11, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
531 AliMedium(13, "Fre$" , 12, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
532 AliMedium(14, "Fre-S$", 12, 1, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
533 AliMedium(15, "Glass$", 13, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
534 AliMedium(16, "Water$", 14, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
535 AliMedium(17, "STEEL$", 15, 0, isxfld, sxmgmx, 10., stemax, deemax, epsil, stmin);
538 //_____________________________________________________________________________
539 Int_t AliTOF::DistancetoPrimitive(Int_t , Int_t ) const
542 // Returns distance from mouse pointer to detector, default version
547 //___________________________________________
548 void AliTOF::ResetHits ()
550 // Reset number of clusters and the cluster array for this detector
551 AliDetector::ResetHits ();
554 //____________________________________________
555 void AliTOF::ResetDigits ()
558 // Reset number of digits and the digits array for this detector
559 AliDetector::ResetDigits ();
562 //____________________________________________
563 void AliTOF::ResetSDigits ()
566 // Reset number of sdigits and the sdigits array for this detector
571 //_____________________________________________________________________________
575 // Initialise TOF detector after it has been built
577 // Set id of TOF sensitive volume
578 if (IsVersion() !=0) fIdSens=gMC->VolId("FPAD");
581 TDirectory* saveDir = gDirectory;
582 gAlice->GetRunLoader()->CdGAFile();
583 fTOFGeometry->Write("TOFGeometry");
587 //____________________________________________________________________________
588 void AliTOF::MakeBranch(Option_t* option)
591 // Initializes the Branches of the TOF inside the
592 // trees written for each event.
593 // AliDetector::MakeBranch initializes just the
594 // Branch inside TreeH. Here we add the branches in
595 // TreeD, TreeS and TreeR.
597 const char *oH = strstr(option,"H");
598 if (fLoader->TreeH() && oH)
602 if (fTZero) fHits = new TClonesArray("AliTOFhitT0", 1000);
603 else fHits = new TClonesArray("AliTOFhit", 1000);
607 AliDetector::MakeBranch(option);
609 Int_t buffersize = 4000;
610 Char_t branchname[10];
611 sprintf(branchname,"%s",GetName());
613 const char *oD = strstr(option,"D");
614 const char *oS = strstr(option,"S");
615 const char *oR = strstr(option,"R");
617 if (fLoader->TreeD() && oD){
618 if (fDigits == 0x0) fDigits = new TClonesArray("AliTOFdigit", 1000);
619 MakeBranchInTree(fLoader->TreeD(), branchname, &fDigits,buffersize, 0) ;
622 if (fLoader->TreeS() && oS){
623 if (fSDigits == 0x0) fSDigits = new TClonesArray("AliTOFSDigit", 1000);
624 MakeBranchInTree(fLoader->TreeS(), branchname, &fSDigits,buffersize, 0) ;
627 if (fReconParticles && fLoader->TreeR() && oR){
628 MakeBranchInTree(fLoader->TreeR(), branchname, &fReconParticles,buffersize, 0) ;
632 //____________________________________________________________________________
633 void AliTOF::Makehits(Bool_t hits)
635 // default argument used, see AliTOF.h
636 // Enable/Disable the writing of the TOF-hits branch
638 // by default : enabled for TOFv1, v2, v3, v4
639 // disabled for TOFv0
641 if (hits && (IsVersion()!=0))
642 fIdSens = gMC->VolId("FPAD");
644 AliInfo("Option for writing the TOF-hits branch on TreeH: disabled");
647 //____________________________________________________________________________
648 void AliTOF::FinishEvent()
653 //---------------------------------------------------------------------
654 void AliTOF::Hits2SDigits()
657 // Use the TOF SDigitizer to make TOF SDigits
660 // cout<<"AliTOF::Hits2SDigits> start...\n";
662 AliRunLoader * rl = fLoader->GetRunLoader();
663 AliTOFSDigitizer sd((rl->GetFileName()).Data());
664 ToAliDebug(1, sd.Print(""));
670 //---------------------------------------------------------------------
671 void AliTOF::Hits2SDigits(Int_t evNumber1, Int_t evNumber2)
674 // Use the TOF SDigitizer to make TOF SDigits
677 if ((evNumber2-evNumber1)==1)
678 AliDebug(1, Form("I am making sdigits for the %dth event", evNumber1))
679 else if ((evNumber2-evNumber1)>1)
680 AliDebug(1, Form("I am making sdigits for the events from the "
681 "%dth to the %dth", evNumber1, evNumber2-1));
683 AliRunLoader * rl = fLoader->GetRunLoader();
684 AliTOFSDigitizer sd((rl->GetFileName()).Data(),evNumber1,evNumber2) ;
685 ToAliDebug(1, sd.Print(""));
691 //___________________________________________________________________________
692 AliDigitizer* AliTOF::CreateDigitizer(AliRunDigitizer* manager) const
694 return new AliTOFDigitizer(manager);
697 //___________________________________________________________________________
698 Bool_t AliTOF::CheckOverlap(Int_t* vol, Float_t* digit,Int_t Track)
701 // Checks if 2 or more hits belong to the same pad.
702 // In this case the data assigned to the digit object
703 // are the ones of the first hit in order of Time.
704 // 2 hits from the same track on the same pad are collected.
705 // Called only by Hits2SDigits.
706 // This procedure has to be optimized in the next TOF release.
709 Bool_t overlap = kFALSE;
712 for (Int_t ndig=0; ndig<fSDigits->GetEntries(); ndig++){
713 AliTOFdigit* currentDigit = (AliTOFdigit*)(fSDigits->UncheckedAt(ndig));
714 currentDigit->GetLocation(vol2);
716 // check on digit volume
717 for (Int_t i=0;i<=4;i++){
719 if (vol[i]!=vol2[i]) idem=kFALSE;}
721 if (idem){ // same pad fired
722 Float_t tdc2 = digit[0];
723 Float_t tdc1 = currentDigit->GetTdc();
725 // we separate two digits on the same pad if
726 // they are separated in time by at least 25 ns
727 // remember that tdc time is given in ps
729 if (TMath::Abs(tdc1-tdc2)<25000){
730 // in case of overlap we take the earliest
732 currentDigit->SetTdc(tdc2);
733 currentDigit->SetAdc(digit[1]);
736 currentDigit->SetTdc(tdc1);
737 currentDigit->SetAdc(digit[1]);
739 currentDigit->AddTrack(Track); // add track number in the track array
745 } // close if (idem) -> two digits on the same TOF pad
747 } // end loop on existing sdigits
753 //____________________________________________________________________________
754 void AliTOF::Digits2Raw()
757 // Starting from the TOF digits, writes the Raw Data objects
760 fLoader->LoadDigits();
762 TTree* digits = fLoader->TreeD();
764 AliError("no digits tree");
768 AliTOFDDLRawData rawWriter;
769 rawWriter.SetVerbose(0);
771 AliInfo("Formatting raw data for TOF");
773 rawWriter.RawDataTOF(digits->GetBranch("TOF"));
775 fLoader->UnloadDigits();
778 ////////////////////////////////////////////////////////////////////////
779 void AliTOF::RecreateSDigitsArray() {
781 // delete TClonesArray fSDigits and create it again
782 // needed for backward compatability with PPR test production
785 fSDigits = new TClonesArray("AliTOFSDigit", 1000);
787 ////////////////////////////////////////////////////////////////////////
788 void AliTOF::CreateSDigitsArray() {
790 // create TClonesArray fSDigits
791 // needed for backward compatability with PPR test production
793 fSDigits = new TClonesArray("AliTOFSDigit", 1000);