Trigger class
[u/mrichter/AliRoot.git] / VZERO / AliVZEROTrigger.cxx
CommitLineData
360938ba 1#include "AliRun.h"
2#include "AliRunLoader.h"
3
4#include "AliVZEROTrigger.h"
5
6//______________________________________________________________________
7ClassImp(AliVZEROTrigger)
8////////////////////////////////////////////////////////////////////////
9//
10// Version 1
11//
12// AliVZEROTrigger:
13//
14////////////////////////////////////////////////////////////////////////
15
16//______________________________________________________________________
17AliVZEROTrigger::AliVZEROTrigger()
18 : AliTriggerDetector()
19{
20 SetName("VZERO");
21 CreateInputs();
22
23 SetAdcThreshold();
24}
25
26//______________________________________________________________________
27void AliVZEROTrigger::CreateInputs()
28{
29 // inputs
30
31 // Do not create inputs again!!
32 if( fInputs.GetEntriesFast() > 0 ) return;
33
34 fInputs.AddLast( new AliTriggerInput( "VZERO_LEFT", "At least one hit in the left VZERO", 0x01 ) );
35 fInputs.AddLast( new AliTriggerInput( "VZERO_RIGHT","At least one hit in the right VZERO", 0x02 ) );
36 fInputs.AddLast( new AliTriggerInput( "VZERO_AND", "At least one hit in the each (left and right) VZERO", 0x02 ) );
37 fInputs.AddLast( new AliTriggerInput( "VZERO_OR", "At least one hit in the one (left one right) VZERO", 0x02 ) );
38
39 fInputs.AddLast( new AliTriggerInput( "VZERO_BEAMGAS", "Beam gas VZERO trigger ", 0x01 ) );
40}
41
42//______________________________________________________________________
43void AliVZEROTrigger::Trigger()
44{
45
46 // ********** Get run loader for the current event **********
47 AliRunLoader* runLoader = gAlice->GetRunLoader();
48
49 AliVZEROLoader* loader = (AliVZEROLoader* )runLoader->GetLoader( "VZEROLoader" );
50
51 loader->LoadDigits("READ");
52 TTree* vzeroDigitsTree = loader->TreeD();
53
54 TClonesArray* vzeroDigits = new TClonesArray("AliVZEROdigit",1000);
55 TBranch* digitBranch = vzeroDigitsTree->GetBranch("VZERODigit");
56 digitBranch->SetAddress(&vzeroDigits);
57
58 // number of hits in left/right
59 Int_t nLeftDig = 0;
60 Int_t nRightDig = 0;
61
62 // first time
63 Float_t firstTimeLeft = 9999;
64 Float_t firstTimeRight = 9999;
65
66 // loop over vzero entries
67 Int_t nEntries = (Int_t)vzeroDigitsTree->GetEntries();
68 for (Int_t e=0; e<nEntries; e++) {
69 vzeroDigitsTree->GetEvent(e);
70
71 Int_t nDigits = vzeroDigits->GetEntriesFast();
72
73 for (Int_t d=0; d<nDigits; d++) {
74 vzeroDigitsTree->GetEvent(d);
75 AliVZEROdigit* digit = (AliVZEROdigit*)vzeroDigits->At(d);
76
77 Int_t cellNumber = digit->CellNumber();
78 Float_t adc = digit->ADC();
79 Float_t tdc = digit->Time(); // in 100 of picoseconds
80
81 if (cellNumber<=47 && adc>fAdcThresHold) {
82 nLeftDig++;
83 if (tdc<firstTimeLeft) firstTimeLeft = tdc;
84 }
85 if (cellNumber>=48 && adc>fAdcThresHold) {
86 nRightDig++;
87 if (tdc<firstTimeRight) firstTimeRight = tdc;
88 }
89 } // end of loop over digits
90 } // end of loop over events in digits tree
91
92 // Beam gas trigger set from the time difference. The time it takes
93 // to travel between the two counters is ~14.3 ns = 143 * 100 ps.
94 // NB: this should be defined
95 // from time windows relative to the time of the bunch crossing!
96 // beam gas comming from the left ...
97
98 if (TMath::Abs(TMath::Abs(firstTimeLeft - firstTimeRight)-143) < 20) // time window of 2 ns
99 SetInput( "VZERO_BEAMGAS" );
100
101 if (nLeftDig > 0)
102 SetInput( "VZERO_LEFT" );
103
104 if (nRightDig > 0)
105 SetInput( "VZERO_RIGHT" );
106
107 if (nLeftDig>0 || nRightDig>0) {
108 SetInput( "VZERO_OR" );
109
110 if (nLeftDig>0 && nRightDig>0) {
111 SetInput( "VZERO_AND" );
112 }
113 }
114
115 AliDebug(1,Form("VZERO cells fired: %d (left) %d (right)", nLeftDig, nRightDig));
116
117 return;
118}
119
120