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80d3b55a | 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 | //////////////////////////////////////////////////////////////////////////// | |
17 | // // | |
18 | // AliTPCCorrectionDrift class | |
19 | // linear drift corrections // | |
20 | // | |
21 | //////////////////////////////////////////////////////////////////////////// | |
22 | #include "AliMagF.h" | |
23 | #include "TGeoGlobalMagField.h" | |
24 | #include "AliTPCcalibDB.h" | |
25 | #include "AliTPCParam.h" | |
26 | #include "AliLog.h" | |
27 | ||
28 | #include "TMath.h" | |
29 | #include "AliTPCROC.h" | |
30 | #include "AliTPCCorrectionDrift.h" | |
31 | ClassImp(AliTPCCorrectionDrift) | |
32 | ||
33 | AliTPCCorrectionDrift::AliTPCCorrectionDrift() | |
34 | : AliTPCCorrection("CorrectionDrift","CorrectionDrift") , | |
35 | fZ0Aside(0), // z- t0*vdrift shift A side | |
36 | fZ0Cside(0), // z- t0*vdrift shift C side | |
37 | fVScale0(0), // drift velocity scaling - constant | |
38 | fVScaleR(0), // drift velocity scaling - radial | |
39 | fVScaleX(0), // drift velocity scaling - global x | |
40 | fVScaleY(0), // drift velocity scaling - global y | |
41 | fIROCZ0(0), | |
42 | fOROCDZ(0) | |
43 | { | |
44 | // | |
45 | // default constructor | |
46 | // | |
47 | } | |
48 | ||
49 | AliTPCCorrectionDrift::~AliTPCCorrectionDrift() { | |
50 | // | |
51 | // default destructor | |
52 | // | |
53 | } | |
54 | ||
55 | ||
56 | ||
57 | void AliTPCCorrectionDrift::Init() { | |
58 | // | |
59 | // Initialization funtion | |
60 | // | |
61 | ||
62 | ||
63 | ||
64 | } | |
65 | ||
66 | void AliTPCCorrectionDrift::Update(const TTimeStamp &/*timeStamp*/) { | |
67 | // | |
68 | // Update function | |
69 | // | |
70 | ||
71 | } | |
72 | ||
73 | ||
74 | ||
75 | void AliTPCCorrectionDrift::GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]) { | |
76 | // | |
77 | // Calculates the correction due conical shape | |
78 | // | |
79 | AliTPCROC * calROC = AliTPCROC::Instance(); | |
80 | //const Double_t kRTPC0 =calROC->GetPadRowRadii(0,0); | |
81 | const Double_t kRTPC1 =calROC->GetPadRowRadii(36,calROC->GetNRows(36)-1); | |
82 | const Double_t kRIO =0.5*(calROC->GetPadRowRadii(0,calROC->GetNRows(0)-1)+calROC->GetPadRowRadii(36,0)); | |
83 | // Float_t rmiddle=(kRTPC0+kRTPC1)/2.; | |
84 | // | |
85 | //Double_t phi = TMath::ATan2(x[1],x[0]); | |
86 | Double_t r = TMath::Sqrt(x[1]*x[1]+x[0]*x[0]); | |
87 | Double_t driftN = 1.-TMath::Abs(x[2])/calROC->GetZLength(0); // drift from 0 to 1 | |
88 | // | |
89 | Double_t dz0 =(roc%36<18) ? fZ0Aside:-fZ0Cside; | |
90 | Double_t dscale= (fVScale0+(fVScaleR*r+fVScaleX*x[0]+fVScaleY*x[1])/kRTPC1); | |
91 | Double_t ddrift=(roc%36<18) ? driftN*dscale*calROC->GetZLength(0):-driftN*dscale*calROC->GetZLength(0); | |
92 | if (r<kRIO) dz0+=(roc%36<18) ? fIROCZ0:-fIROCZ0; | |
93 | if (r>kRIO) dz0+=(roc%36<18) ? fOROCDZ*(r-kRIO):-fOROCDZ*(r-kRIO); | |
94 | // Calculate correction in cartesian coordinates | |
95 | dx[0] = 0; | |
96 | dx[1] = 0; | |
97 | dx[2] = dz0+ddrift; // z distortion not implemented (1st order distortions) | |
98 | ||
99 | } | |
100 | ||
101 | ||
102 | ||
103 | ||
104 | ||
105 | void AliTPCCorrectionDrift::Print(const Option_t* option) const { | |
106 | // | |
107 | // Print function to check the settings (e.g. the twist in the X direction) | |
108 | // | |
109 | // | |
110 | ||
111 | TString opt = option; opt.ToLower(); | |
112 | printf("%s\t%s\n",GetName(),GetTitle()); | |
113 | ||
114 | if (opt.Contains("a")) { // Print all details | |
115 | printf(" - T0A: %1.4f, T0C: %1.4f (cm)\n",fZ0Aside,fZ0Cside); | |
116 | printf(" - Scale0: %1.4f, ScaleR: %1.4f \n",fVScale0,fVScaleR); | |
117 | printf(" - ScaleX: %1.4f, ScaleY: %1.4f \n",fVScaleX,fVScaleY); | |
118 | ||
119 | } | |
120 | ||
121 | ||
122 | } |