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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | // $Id$ | |
17 | ||
18 | #include <TClonesArray.h> | |
19 | #include <TParticle.h> | |
20 | #include <TTree.h> | |
21 | ||
22 | #include "AliMUONSDigitizerV2.h" | |
23 | ||
24 | #include "AliMUON.h" | |
25 | #include "AliMUONChamber.h" | |
26 | #include "AliMUONVDigit.h" | |
27 | #include "AliMUONHit.h" | |
28 | #include "AliMUONVDigitStore.h" | |
29 | #include "AliMUONVHitStore.h" | |
30 | #include "AliMUONResponseTrigger.h" | |
31 | #include "AliMUONConstants.h" | |
32 | ||
33 | #include "AliMpCDB.h" | |
34 | #include "AliMpDEManager.h" | |
35 | ||
36 | #include "AliLog.h" | |
37 | #include "AliCDBManager.h" | |
38 | #include "AliLoader.h" | |
39 | #include "AliRun.h" | |
40 | #include "AliRunLoader.h" | |
41 | ||
42 | #include "AliHeader.h" | |
43 | #include "AliGenCocktailEventHeader.h" | |
44 | ||
45 | //----------------------------------------------------------------------------- | |
46 | /// The sdigitizer performs the transformation from hits (energy deposits by | |
47 | /// the transport code) to sdigits (equivalent of charges on pad). | |
48 | /// | |
49 | /// It does so by converting the energy deposit into a charge and then spreading | |
50 | /// this charge over several pads, according to the response function (a | |
51 | /// Mathieson distribution, basically). | |
52 | /// | |
53 | /// See also AliMUONResponseV0, which is doing the real job (in DisIntegrate | |
54 | /// method), while this sdigitizer is just "steering" the process. | |
55 | /// | |
56 | /// Please note that we do *not* merge sdigits after creation, which means | |
57 | /// that after sdigitization, a given pad can have several sdigits. This | |
58 | /// merging is taken care of later on by the digitizer(V3). | |
59 | //----------------------------------------------------------------------------- | |
60 | ||
61 | ClassImp(AliMUONSDigitizerV2) | |
62 | ||
63 | Float_t AliMUONSDigitizerV2::fgkMaxIntTime = 10.0; | |
64 | Float_t AliMUONSDigitizerV2::fgkMaxPosTimeDif = 1.22E-6; | |
65 | Float_t AliMUONSDigitizerV2::fgkMaxNegTimeDif = -3.5E-6; | |
66 | Float_t AliMUONSDigitizerV2::fgkMinTimeDif = 25E-9; | |
67 | ||
68 | //_____________________________________________________________________________ | |
69 | AliMUONSDigitizerV2::AliMUONSDigitizerV2() | |
70 | : TNamed("AliMUONSDigitizerV2","From Hits to SDigits for MUON") | |
71 | { | |
72 | /// | |
73 | /// ctor. | |
74 | /// | |
75 | ||
76 | // Load mapping | |
77 | if ( ! AliMpCDB::LoadMpSegmentation() ) { | |
78 | AliFatal("Could not access mapping from OCDB !"); | |
79 | } | |
80 | } | |
81 | ||
82 | //_____________________________________________________________________________ | |
83 | AliMUONSDigitizerV2::~AliMUONSDigitizerV2() | |
84 | { | |
85 | /// | |
86 | /// dtor. | |
87 | /// | |
88 | } | |
89 | ||
90 | //_____________________________________________________________________________ | |
91 | void | |
92 | AliMUONSDigitizerV2::Digitize(Option_t*) | |
93 | { | |
94 | /// | |
95 | /// Go from hits to sdigits. | |
96 | /// | |
97 | /// In the code below, apart from the loop itself (which look complicated | |
98 | /// but is really only a loop on each hit in the input file) the main | |
99 | /// work is done in AliMUONResponse::DisIntegrate method, which converts | |
100 | /// a single hit in (possibly) several sdigits. | |
101 | /// | |
102 | ||
103 | AliDebug(1,""); | |
104 | ||
105 | AliRunLoader* runLoader = AliRunLoader::Instance(); | |
106 | AliLoader* loader = runLoader->GetDetectorLoader("MUON"); | |
107 | ||
108 | loader->LoadHits("READ"); | |
109 | ||
110 | AliMUON* muon = static_cast<AliMUON*>(gAlice->GetModule("MUON")); | |
111 | ||
112 | Int_t nofEvents(runLoader->GetNumberOfEvents()); | |
113 | ||
114 | TString classname = muon->DigitStoreClassName(); | |
115 | ||
116 | AliMUONVDigitStore* sDigitStore = AliMUONVDigitStore::Create(classname.Data()); | |
117 | ||
118 | if (!sDigitStore) | |
119 | { | |
120 | AliFatal(Form("Could not create digitstore of class %s",classname.Data())); | |
121 | } | |
122 | ||
123 | AliDebug(1,Form("Will use digitStore of type %s",sDigitStore->ClassName())); | |
124 | ||
125 | // average arrival time to chambers, for pileup studies | |
126 | ||
127 | for ( Int_t iEvent = 0; iEvent < nofEvents; ++iEvent ) | |
128 | { | |
129 | // Loop over events. | |
130 | TObjArray tdlist; | |
131 | tdlist.SetOwner(kTRUE); | |
132 | ||
133 | AliDebug(1,Form("iEvent=%d",iEvent)); | |
134 | runLoader->GetEvent(iEvent); | |
135 | ||
136 | // for pile up studies | |
137 | float t0=fgkMaxIntTime; int aa=0; | |
138 | AliHeader* header = runLoader->GetHeader(); | |
139 | AliGenCocktailEventHeader* cocktailHeader = | |
140 | dynamic_cast<AliGenCocktailEventHeader*>(header->GenEventHeader()); | |
141 | if (cocktailHeader) { | |
142 | AliGenCocktailEventHeader* genEventHeader = (AliGenCocktailEventHeader*) (header->GenEventHeader()); | |
143 | TList* headers = genEventHeader->GetHeaders(); | |
144 | TIter nextH(headers); | |
145 | AliGenEventHeader *entry; | |
146 | while((entry = (AliGenEventHeader*)nextH())) { | |
147 | float t = entry->InteractionTime(); | |
148 | if (TMath::Abs(t)<TMath::Abs(t0)) t0 = t; | |
149 | aa++; | |
150 | } | |
151 | } else { | |
152 | AliGenEventHeader* evtHeader = | |
153 | (AliGenEventHeader*)(header->GenEventHeader()); | |
154 | float t = evtHeader->InteractionTime(); | |
155 | if (TMath::Abs(t)<TMath::Abs(t0)) t0 = t; | |
156 | aa++; | |
157 | } | |
158 | ||
159 | loader->MakeSDigitsContainer(); | |
160 | ||
161 | TTree* treeS = loader->TreeS(); | |
162 | ||
163 | if ( !treeS ) | |
164 | { | |
165 | AliFatal(""); | |
166 | } | |
167 | ||
168 | sDigitStore->Connect(*treeS); | |
169 | ||
170 | TTree* treeH = loader->TreeH(); | |
171 | ||
172 | AliMUONVHitStore* hitStore = AliMUONVHitStore::Create(*treeH); | |
173 | hitStore->Connect(*treeH); | |
174 | ||
175 | Long64_t nofTracks = treeH->GetEntries(); | |
176 | ||
177 | for ( Long64_t iTrack = 0; iTrack < nofTracks; ++iTrack ) | |
178 | { | |
179 | // Loop over the tracks of this event. | |
180 | treeH->GetEvent(iTrack); | |
181 | ||
182 | AliMUONHit* hit; | |
183 | TIter next(hitStore->CreateIterator()); | |
184 | Int_t ihit(0); | |
185 | ||
186 | while ( ( hit = static_cast<AliMUONHit*>(next()) ) ) | |
187 | { | |
188 | Int_t chamberId = hit->Chamber()-1; | |
189 | Float_t age = hit->Age()-t0; | |
190 | ||
191 | AliMUONChamber& chamber = muon->Chamber(chamberId); | |
192 | AliMUONResponse* response = chamber.ResponseModel(); | |
193 | ||
194 | // This is the heart of this method : the dis-integration | |
195 | TList digits; | |
196 | if (aa>1){ // if there are pileup events | |
197 | Float_t chamberTime = AliMUONConstants::AverageChamberT(chamberId); | |
198 | Float_t timeDif=age-chamberTime; | |
199 | if (timeDif>fgkMaxPosTimeDif || timeDif<fgkMaxNegTimeDif) { | |
200 | continue; | |
201 | } | |
202 | if(TMath::Abs(timeDif)>fgkMinTimeDif){ | |
203 | response->DisIntegrate(*hit,digits,timeDif); | |
204 | } | |
205 | else{ | |
206 | response->DisIntegrate(*hit,digits,0.); | |
207 | } | |
208 | } | |
209 | else{ | |
210 | response->DisIntegrate(*hit,digits,0.); | |
211 | } | |
212 | ||
213 | TIter nextd(&digits); | |
214 | AliMUONVDigit* d; | |
215 | while ( ( d = (AliMUONVDigit*)nextd() ) ) | |
216 | { | |
217 | // Update some sdigit information that could not be known | |
218 | // by the DisIntegrate method | |
219 | d->SetHit(ihit); | |
220 | d->SetTime(age); | |
221 | d->AddTrack(hit->GetTrack(),d->Charge()); | |
222 | tdlist.Add(d); | |
223 | } | |
224 | ++ihit; | |
225 | } | |
226 | hitStore->Clear(); | |
227 | } // end of loop on tracks within an event | |
228 | ||
229 | TIter next(&tdlist); | |
230 | AliMUONVDigit* d; | |
231 | ||
232 | while ( ( d = static_cast<AliMUONVDigit*>(next()) ) ) | |
233 | { | |
234 | d->ChargeInFC(kTRUE); | |
235 | ||
236 | AliMUONVDigit* added = sDigitStore->Add(*d,AliMUONVDigitStore::kMerge); | |
237 | if (!added) | |
238 | { | |
239 | AliError("Could not add digit to digitStore"); | |
240 | } | |
241 | } | |
242 | ||
243 | treeS->Fill(); | |
244 | ||
245 | loader->WriteSDigits("OVERWRITE"); | |
246 | ||
247 | sDigitStore->Clear(); | |
248 | ||
249 | loader->UnloadSDigits(); | |
250 | ||
251 | delete hitStore; | |
252 | ||
253 | } // loop on events | |
254 | ||
255 | loader->UnloadHits(); | |
256 | ||
257 | delete sDigitStore; | |
258 | ||
259 | } |