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.),
54 //Real (private) constructor
55 //Set default parameters
57 //Parameters describing energy deposition and light collection by APD, used in AliPHOSv1
58 //Photoelectron statistics:
59 // The light yield is a poissonian distribution of the number of
60 // photons created in the PbWo4 crystal, calculated using following formula
61 // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency
62 // LightYieldMean is parameter calculated to be over 47000 photons per GeV
63 // APDEfficiency is 0.02655
64 // k_0 is 0.0045 from Valery Antonenko
65 // The number of electrons created in the APD is
66 // NumberOfElectrons = APDGain * LightYield
67 // The APD Gain is 300
68 fLightYieldMean = 47000; //Average number of photoelectrons per GeV
69 fIntrinsicAPDEfficiency = 0.02655 ; //APD efficiency including geometric coverage
70 // fLightYieldAttenuation = 0.0045 ; //light attenuation in PWO. Last analysis shows no z-position dependence
71 // //so we removed this dependence from simulations
72 fLightFactor = fLightYieldMean * fIntrinsicAPDEfficiency ; //Average number of photons collected by
73 //APD per GeV deposited energy
74 fAPDFactor = (13.418/fLightYieldMean/100.) * 300. ; //factor relating light yield and APD response
75 //evaluated as (13.418/fLightYieldMean/100) * APDGain ;
78 //Parameters defining electronic noise calculation and Digits noise thresholds
79 //used in AliPHOSDigitizer
80 fAPDNoise = 0.004 ; // [GeV]
81 fEMCDigitThreshold = 2.5 ; // [ADC counts]
82 fEMCADCchannel = 0.005 ; // [GeV]
83 fTOFa = 0.5e-9 ; // [sec] constant term
84 fTOFb = 1.e-9 ; // [sec/sqrt(GeV)]] stohastic term
86 fADCpedestalCpv = 0.012 ; // [aux units]
87 fADCchanelCpv = 0.0012; // [aux units]
88 fCPVNoise = 0.01; // [aux units]
89 fCPVDigitThreshold = 0.09 ; // [aux units]
90 fNADCcpv = (Int_t)TMath::Power(2,12) ;
92 //Imput streams for merging. If true => this stream contains digits (and thus noise) and not SDigits.
93 for(Int_t i=0; i<10; i++){
99 //-----------------------------------------------------------------------------
100 AliPHOSSimParam::AliPHOSSimParam(const AliPHOSSimParam& ):
102 fLightYieldMean(0.),fIntrinsicAPDEfficiency(0.),
103 fLightFactor(0.),fAPDFactor(0.),
104 fAPDNoise(0.),fEMCDigitThreshold(0.),
105 fEMCADCchannel(0.),fTOFa(0.),fTOFb(0.),
106 fADCpedestalCpv(0.),fADCchanelCpv(0.),
107 fCPVNoise(0.),fCPVDigitThreshold(0.),fNADCcpv(0),
111 AliError("Should not use copy constructor for singleton") ;
112 for(Int_t i=0; i<10; i++){
117 //-----------------------------------------------------------------------------
118 AliPHOSSimParam * AliPHOSSimParam::GetInstance(){
121 new AliPHOSSimParam(0) ;
124 //-----------------------------------------------------------------------------
125 AliPHOSSimParam& AliPHOSSimParam::operator = (const AliPHOSSimParam& simParam)
127 //Assignment operator.
129 if(this != &simParam) {
130 AliError("Should not use operator= for singleton\n") ;