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0116859c | 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 | //////////////////////////////////////////////////////////////////////////// | |
b4caed64 | 17 | // AliTPCExBBShape class // |
0116859c | 18 | //////////////////////////////////////////////////////////////////////////// |
19 | ||
20 | #include <AliMagF.h> | |
534fd34a | 21 | #include "TGeoGlobalMagField.h" |
22 | #include "AliTPCcalibDB.h" | |
23 | #include "AliTPCParam.h" | |
24 | #include "AliLog.h" | |
0116859c | 25 | |
26 | #include "AliTPCExBBShape.h" | |
27 | ||
28 | AliTPCExBBShape::AliTPCExBBShape() | |
29 | : AliTPCCorrection("exb_bshape","ExB B-shape"), | |
30 | fC1(0.),fC2(0.), | |
31 | fBField(0) | |
32 | { | |
33 | // | |
34 | // default constructor | |
35 | // | |
36 | } | |
37 | ||
38 | AliTPCExBBShape::~AliTPCExBBShape() { | |
39 | // | |
40 | // virtual destructor | |
41 | // | |
42 | } | |
43 | ||
e527a1b9 | 44 | void AliTPCExBBShape::Init() { |
45 | // | |
534fd34a | 46 | // Initialization funtion |
e527a1b9 | 47 | // |
48 | ||
534fd34a | 49 | AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); |
50 | if (!magF) AliError("Magneticd field - not initialized"); | |
51 | Double_t bzField = magF->SolenoidField()/10.; //field in T | |
52 | SetBField(magF); | |
53 | AliTPCParam *param= AliTPCcalibDB::Instance()->GetParameters(); | |
54 | if (!param) AliError("Parameters - not initialized"); | |
55 | Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally) | |
e527a1b9 | 56 | Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully) |
57 | Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ; | |
e527a1b9 | 58 | // Correction Terms for effective omegaTau; obtained by a laser calibration run |
534fd34a | 59 | SetOmegaTauT1T2(wt,fT1,fT2); |
e527a1b9 | 60 | |
61 | ||
62 | } | |
63 | ||
64 | void AliTPCExBBShape::Update(const TTimeStamp &/*timeStamp*/) { | |
65 | // | |
66 | // Update function | |
67 | // | |
534fd34a | 68 | AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); |
69 | if (!magF) AliError("Magneticd field - not initialized"); | |
70 | Double_t bzField = magF->SolenoidField()/10.; //field in T | |
71 | SetBField(magF); | |
72 | AliTPCParam *param= AliTPCcalibDB::Instance()->GetParameters(); | |
73 | if (!param) AliError("Parameters - not initialized"); | |
74 | Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally) | |
e527a1b9 | 75 | Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully) |
76 | Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ; | |
e527a1b9 | 77 | // Correction Terms for effective omegaTau; obtained by a laser calibration run |
534fd34a | 78 | SetOmegaTauT1T2(wt,fT1,fT2); |
e527a1b9 | 79 | |
80 | ||
81 | } | |
82 | ||
83 | ||
84 | ||
0116859c | 85 | void AliTPCExBBShape::GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]) { |
86 | // | |
87 | // Calculates the space point corrections of the B field inperfections (B field shape) | |
88 | // | |
89 | ||
90 | if (!fBField) { | |
91 | for (Int_t j=0;j<3;++j) dx[j]=0.; | |
92 | return; | |
93 | } | |
94 | ||
95 | const Double_t xStart[3]={ x[0], x[1], x[2] }; | |
b1f0a2a5 | 96 | const Double_t xEnd[3]={ x[0], x[1], roc%36<18?fgkTPCZ0:-fgkTPCZ0 }; |
0116859c | 97 | |
98 | Double_t intBStart[3]; | |
99 | Double_t intBEnd[3]; | |
100 | ||
101 | fBField->GetTPCRatInt(xStart,intBStart); | |
102 | fBField->GetTPCRatInt(xEnd, intBEnd ); | |
103 | ||
104 | const Float_t intBxOverBz=(intBEnd[0]-intBStart[0]); | |
105 | const Float_t intByOverBz=(intBEnd[1]-intBStart[1]); | |
106 | ||
107 | dx[0]=fC2*intBxOverBz-fC1*intByOverBz; | |
108 | dx[1]=fC1*intBxOverBz+fC2*intByOverBz; | |
109 | dx[2]=0.; | |
110 | ||
111 | ||
112 | } | |
113 | ||
114 | void AliTPCExBBShape::GetBxAndByOverBz(const Float_t x[],const Short_t roc,Float_t BxByOverBz[]) { | |
115 | // | |
116 | // This function is purely for calibration purposes | |
117 | // Returns the via AliMagF obtaind B field integrals | |
118 | // | |
119 | ||
120 | if (!fBField) { | |
121 | for (Int_t j=0;j<3;++j) BxByOverBz[j]=0.; | |
122 | return; | |
123 | } | |
124 | ||
125 | const Double_t xStart[3]={ x[0], x[1], x[2] }; | |
b1f0a2a5 | 126 | const Double_t xEnd[3]={ x[0], x[1], roc%36<18?fgkTPCZ0:-fgkTPCZ0 }; |
0116859c | 127 | |
128 | Double_t intBStart[3]; | |
129 | Double_t intBEnd[3]; | |
130 | ||
131 | fBField->GetTPCRatInt(xStart,intBStart); | |
132 | fBField->GetTPCRatInt(xEnd, intBEnd ); | |
133 | ||
134 | const Float_t intBxOverBz=(intBEnd[0]-intBStart[0]); | |
135 | const Float_t intByOverBz=(intBEnd[1]-intBStart[1]); | |
136 | ||
137 | BxByOverBz[0]=intBxOverBz; | |
138 | BxByOverBz[1]=intByOverBz; | |
139 | ||
140 | } | |
141 | ||
142 | void AliTPCExBBShape::Print(Option_t* option) const { | |
143 | // | |
144 | // Print function to check the settings (e.g. voltage offsets) | |
145 | // option=="a" prints details of the B field settings and the | |
146 | // C0 and C1 coefficents (for calibration purposes) | |
147 | // | |
148 | TString opt = option; opt.ToLower(); | |
534fd34a | 149 | printf("%s\t%s\n - B field settings:\n",GetTitle(),GetName()); |
0116859c | 150 | fBField->Print(option); |
151 | // printf(" - B field: X-Twist: %1.5lf rad, Y-Twist: %1.5lf rad \n",fBField->Print(option)); | |
534fd34a | 152 | if (opt.Contains("a")) { // Print all details |
153 | printf(" - T1: %1.4f, T2: %1.4f \n",fT1,fT2); | |
0116859c | 154 | printf(" - C1: %1.4f, C2: %1.4f \n",fC1,fC2); |
155 | } | |
0116859c | 156 | } |
46e89793 | 157 | |
158 | Double_t AliTPCExBBShape::GetBFieldXYZ(Double_t gx, Double_t gy, Double_t gz, Int_t axisType){ | |
159 | // | |
160 | // return B field at given x,y,z | |
161 | // | |
162 | AliMagF* field = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); | |
163 | if (!field) return 0; | |
164 | Double_t xyz[3]={gx,gy,gz}; | |
165 | Double_t bxyz[3]={0}; | |
166 | field->Field(xyz,bxyz); | |
167 | // | |
168 | Double_t r=TMath::Sqrt(gx*gx+gy*gy); | |
a8ef8a9c | 169 | // Double_t b=TMath::Sqrt(bxyz[0]*bxyz[0]+bxyz[1]*bxyz[1]); |
46e89793 | 170 | if (axisType==0) { |
171 | return (xyz[0]*bxyz[1]-xyz[1]*bxyz[0])/(bxyz[2]*r); | |
172 | } | |
173 | if (axisType==1){ | |
174 | return (xyz[0]*bxyz[0]+xyz[1]*bxyz[1])/(bxyz[2]*r); | |
175 | } | |
176 | if (axisType==2) return bxyz[2]; | |
177 | if (axisType==3) return bxyz[0]; | |
178 | if (axisType==4) return bxyz[1]; | |
179 | if (axisType==5) return bxyz[2]; | |
180 | return bxyz[2]; | |
181 | } |