1 /**************************************************************************
2 * Copyright(c) 2007, 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 **************************************************************************/
16 // Base class for the PHOS simulation parameters.
17 // Do not use in the simulation; use derivative classes instead.
18 // Author: Dmitri Peressounko, RRC KI
20 // --- AliRoot header files ---
21 #include "AliPHOSSimParam.h"
24 ClassImp(AliPHOSSimParam)
26 AliPHOSSimParam * AliPHOSSimParam::fgSimParam = 0 ;
27 //-----------------------------------------------------------------------------
28 AliPHOSSimParam::AliPHOSSimParam() :
30 fLightYieldMean(0.),fIntrinsicAPDEfficiency(0.),
31 fLightFactor(0.),fAPDFactor(0.),
32 fAPDNoise(0.),fEMCDigitThreshold(0.),
33 fEMCADCchannel(0.),fTOFa(0.),fTOFb(0.),
34 fADCpedestalCpv(0.),fADCchanelCpv(0.),
35 fCPVNoise(0.),fCPVDigitThreshold(0.),fNADCcpv(0),
38 //Default constructor.
39 for(Int_t i=0; i<10; i++) fDStream[i] = 0 ;
42 //-----------------------------------------------------------------------------
43 AliPHOSSimParam::AliPHOSSimParam(Int_t) :
45 fLightYieldMean(0.),fIntrinsicAPDEfficiency(0.),
46 fLightFactor(0.),fAPDFactor(0.),
47 fAPDNoise(0.),fEMCDigitThreshold(0.),
48 fEMCADCchannel(0.),fTOFa(0.),fTOFb(0.),
49 fADCpedestalCpv(0.),fADCchanelCpv(0.),
50 fCPVNoise(0.),fCPVDigitThreshold(0.),fNADCcpv(0),
53 //Real (private) constructor
54 //Set default parameters
56 //Parameters describing energy deposition and light collection by APD, used in AliPHOSv1
57 //Photoelectron statistics:
58 // The light yield is a poissonian distribution of the number of
59 // photons created in the PbWo4 crystal, calculated using following formula
60 // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency
61 // LightYieldMean is parameter calculated to be over 47000 photons per GeV
62 // APDEfficiency is 0.02655
63 // k_0 is 0.0045 from Valery Antonenko
64 // The number of electrons created in the APD is
65 // NumberOfElectrons = APDGain * LightYield
66 // The APD Gain is 300
67 fLightYieldMean = 47000; //Average number of photoelectrons per GeV
68 fIntrinsicAPDEfficiency = 0.02655 ; //APD efficiency including geometric coverage
69 // fLightYieldAttenuation = 0.0045 ; //light attenuation in PWO. Last analysis shows no z-position dependence
70 // //so we removed this dependence from simulations
71 fLightFactor = fLightYieldMean * fIntrinsicAPDEfficiency ; //Average number of photons collected by
72 //APD per GeV deposited energy
73 fAPDFactor = (13.418/fLightYieldMean/100.) * 300. ; //factor relating light yield and APD response
74 //evaluated as (13.418/fLightYieldMean/100) * APDGain ;
77 //Parameters defining electronic noise calculation and Digits noise thresholds
78 //used in AliPHOSDigitizer
79 fAPDNoise = 0.004 ; // [GeV]
80 fEMCDigitThreshold = 0.012 ; // [GeV]
81 fEMCADCchannel = 0.005 ; // [GeV]
82 fTOFa = 0.5e-9 ; // [sec] constant term
83 fTOFb = 1.e-9 ; // [sec/sqrt(GeV)]] stohastic term
85 fADCpedestalCpv = 0.012 ; // [aux units]
86 fADCchanelCpv = 0.0012; // [aux units]
87 fCPVNoise = 0.01; // [aux units]
88 fCPVDigitThreshold = 0.09 ; // [aux units]
89 fNADCcpv = (Int_t)TMath::Power(2,12) ;
91 //Imput streams for merging. If true => this stream contains digits (and thus noise) and not SDigits.
92 for(Int_t i=0; i<10; i++){
98 //-----------------------------------------------------------------------------
99 AliPHOSSimParam::AliPHOSSimParam(const AliPHOSSimParam& ):
101 fLightYieldMean(0.),fIntrinsicAPDEfficiency(0.),
102 fLightFactor(0.),fAPDFactor(0.),
103 fAPDNoise(0.),fEMCDigitThreshold(0.),
104 fEMCADCchannel(0.),fTOFa(0.),fTOFb(0.),
105 fADCpedestalCpv(0.),fADCchanelCpv(0.),
106 fCPVNoise(0.),fCPVDigitThreshold(0.),fNADCcpv(0),
110 AliError("Should not use copy constructor for singleton") ;
111 for(Int_t i=0; i<10; i++){
116 //-----------------------------------------------------------------------------
117 AliPHOSSimParam * AliPHOSSimParam::GetInstance(){
120 new AliPHOSSimParam(0) ;
123 //-----------------------------------------------------------------------------
124 AliPHOSSimParam& AliPHOSSimParam::operator = (const AliPHOSSimParam& simParam)
126 //Assignment operator.
128 if(this != &simParam) {
129 AliError("Should not use operator= for singleton\n") ;