RKUTA choice doc in README. RKUTA as default in Config_MUON_test.C
[u/mrichter/AliRoot.git] / MUON / AliMUONResponseV0.cxx
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a9e2aefa 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
88cb7938 16/* $Id$ */
a9e2aefa 17
18#include "AliMUONResponseV0.h"
a30a000f 19#include "AliSegmentation.h"
a9e2aefa 20#include <TMath.h>
21#include <TRandom.h>
22
23
d5bfadcc 24ClassImp(AliMUONResponseV0)
25
26 //__________________________________________________________________________
27void AliMUONResponseV0::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
28{
29 // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
30 // in the X direction, perpendicular to the wires,
31 // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
32 // in the same direction
33 fSqrtKx3 = SqrtKx3;
34 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
35 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
36 fKx4 = cx1 / fKx2 / fSqrtKx3;
37}
38
39 //__________________________________________________________________________
40void AliMUONResponseV0::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
41{
42 // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
43 // in the Y direction, along the wires,
44 // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
45 // in the same direction
46 fSqrtKy3 = SqrtKy3;
47 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
48 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
49 fKy4 = cy1 / fKy2 / fSqrtKy3;
50}
51
a9e2aefa 52Float_t AliMUONResponseV0::IntPH(Float_t eloss)
53{
54 // Calculate charge from given ionization energy loss
55 Int_t nel;
56 nel= Int_t(eloss*1.e9/32.);
57 Float_t charge=0;
58 if (nel == 0) nel=1;
59 for (Int_t i=1;i<=nel;i++) {
01997fa2 60 Float_t arg=0.;
61 while(!arg) arg = gRandom->Rndm();
62 charge -= fChargeSlope*TMath::Log(arg);
a9e2aefa 63 }
64 return charge;
65}
66// -------------------------------------------
67
a30a000f 68Float_t AliMUONResponseV0::IntXY(AliSegmentation * segmentation)
a9e2aefa 69{
70// Calculate charge on current pad according to Mathieson distribution
71//
72 const Float_t kInversePitch = 1/fPitch;
73//
74// Integration limits defined by segmentation model
75//
76 Float_t xi1, xi2, yi1, yi2;
77 segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
78 xi1=xi1*kInversePitch;
79 xi2=xi2*kInversePitch;
80 yi1=yi1*kInversePitch;
81 yi2=yi2*kInversePitch;
82//
83// The Mathieson function
84 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
85 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
86
87 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
88 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
89
90
91 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
92 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
93}
94
f7b62f08 95Int_t AliMUONResponseV0::DigitResponse(Int_t digit, AliMUONTransientDigit* /*where*/)
a9e2aefa 96{
97 // add white noise and do zero-suppression and signal truncation
b64652f5 98// Float_t meanNoise = gRandom->Gaus(1, 0.2);
99 // correct noise for slat chambers;
100 // one more field to add to AliMUONResponseV0 to allow different noises ????
101 Float_t meanNoise = gRandom->Gaus(1.5, 0.2);
a9e2aefa 102 Float_t noise = gRandom->Gaus(0, meanNoise);
103 digit+=(Int_t)noise;
104 if ( digit <= ZeroSuppression()) digit = 0;
105 if ( digit > MaxAdc()) digit=MaxAdc();
106 return digit;
107}
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