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4c039060 | 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 | ||
4c039060 | 16 | |
db83d72f | 17 | #include <TClass.h> |
18 | #include <TFile.h> | |
19 | #include <TSystem.h> | |
fe4da5cc | 20 | |
21 | #include "AliMagF.h" | |
db83d72f | 22 | #include "AliMagWrapCheb.h" |
23 | #include "AliLog.h" | |
972ca52f | 24 | |
fe4da5cc | 25 | ClassImp(AliMagF) |
26 | ||
9251fceb | 27 | const Double_t AliMagF::fgkSol2DipZ = -700.; |
1dd3d90e | 28 | const UShort_t AliMagF::fgkPolarityConvention = kConvLHC; |
db83d72f | 29 | |
1dd3d90e | 30 | /* |
31 | Explanation for polarity conventions: these are the mapping between the | |
32 | current signs and main field components in L3 (Bz) and Dipole (Bx) (in Alice frame) | |
33 | 1) kConvMap2005: used for the field mapping in 2005 | |
34 | positive L3 current -> negative Bz | |
35 | positive Dip current -> positive Bx | |
36 | 2) kConvMapDCS2008: defined by the microswitches/cabling of power converters as of 2008 - 1st half 2009 | |
37 | positive L3 current -> positive Bz | |
38 | positive Dip current -> positive Bx | |
39 | 3) kConvLHC : defined by LHC | |
40 | positive L3 current -> negative Bz | |
41 | positive Dip current -> negative Bx | |
42 | ||
43 | Note: only "negative Bz(L3) with postive Bx(Dipole)" and its inverse was mapped in 2005. Hence | |
44 | the GRP Manager will reject the runs with the current combinations (in the convention defined by the | |
45 | static Int_t AliMagF::GetPolarityConvention()) which do not lead to such field polarities. | |
46 | */ | |
e2afb3b6 | 47 | //_______________________________________________________________________ |
48 | AliMagF::AliMagF(): | |
db83d72f | 49 | TVirtualMagField(), |
50 | fMeasuredMap(0), | |
51 | fMapType(k5kG), | |
52 | fSolenoid(0), | |
53 | fBeamType(kNoBeamField), | |
54 | fBeamEnergy(0), | |
db83d72f | 55 | // |
e2afb3b6 | 56 | fInteg(0), |
db83d72f | 57 | fPrecInteg(0), |
58 | fFactorSol(1.), | |
59 | fFactorDip(1.), | |
60 | fMax(15), | |
61 | fDipoleOFF(kFALSE), | |
e2afb3b6 | 62 | // |
db83d72f | 63 | fQuadGradient(0), |
64 | fDipoleField(0), | |
65 | fCCorrField(0), | |
66 | fACorr1Field(0), | |
67 | fACorr2Field(0), | |
68 | fParNames("","") | |
69 | { | |
e2afb3b6 | 70 | // Default constructor |
71 | // | |
72 | } | |
73 | ||
74 | //_______________________________________________________________________ | |
db83d72f | 75 | AliMagF::AliMagF(const char *name, const char* title, Int_t integ, |
76 | Double_t factorSol, Double_t factorDip, | |
77 | Double_t fmax, BMap_t maptype, const char* path, | |
9251fceb | 78 | BeamType_t bt, Double_t be): |
db83d72f | 79 | TVirtualMagField(name), |
80 | fMeasuredMap(0), | |
81 | fMapType(maptype), | |
82 | fSolenoid(0), | |
83 | fBeamType(bt), | |
84 | fBeamEnergy(be), | |
db83d72f | 85 | // |
86 | fInteg(integ), | |
604e0531 | 87 | fPrecInteg(1), |
db83d72f | 88 | fFactorSol(1.), |
89 | fFactorDip(1.), | |
972ca52f | 90 | fMax(fmax), |
db83d72f | 91 | fDipoleOFF(factorDip==0.), |
92 | // | |
93 | fQuadGradient(0), | |
94 | fDipoleField(0), | |
95 | fCCorrField(0), | |
96 | fACorr1Field(0), | |
97 | fACorr2Field(0), | |
98 | fParNames("","") | |
fe4da5cc | 99 | { |
9251fceb | 100 | // Initialize the field with Geant integration option "integ" and max field "fmax, |
101 | // Impose scaling of parameterized L3 field by factorSol and of dipole by factorDip. | |
102 | // The "be" is the energy of the beam in GeV/nucleon | |
aee8290b | 103 | // |
db83d72f | 104 | SetTitle(title); |
105 | if(integ<0 || integ > 2) { | |
106 | AliWarning(Form("Invalid magnetic field flag: %5d; Helix tracking chosen instead",integ)); | |
107 | fInteg = 2; | |
108 | } | |
109 | if (fInteg == 0) fPrecInteg = 0; | |
aee8290b | 110 | // |
db83d72f | 111 | const char* parname = 0; |
112 | // | |
f04e7f5f | 113 | if (fMapType == k2kG) parname = fDipoleOFF ? "Sol12_Dip0_Hole":"Sol12_Dip6_Hole"; |
114 | else if (fMapType == k5kG) parname = fDipoleOFF ? "Sol30_Dip0_Hole":"Sol30_Dip6_Hole"; | |
115 | else if (fMapType == k5kGUniform) parname = "Sol30_Dip6_Uniform"; | |
116 | else AliFatal(Form("Unknown field identifier %d is requested\n",fMapType)); | |
db83d72f | 117 | // |
118 | SetDataFileName(path); | |
119 | SetParamName(parname); | |
120 | // | |
db83d72f | 121 | LoadParameterization(); |
122 | InitMachineField(fBeamType,fBeamEnergy); | |
f04e7f5f | 123 | double xyz[3]={0.,0.,0.}; |
124 | fSolenoid = GetBz(xyz); | |
125 | SetFactorSol(factorSol); | |
126 | SetFactorDip(factorDip); | |
e86708b3 | 127 | AliInfo(Form("Alice B fields: Solenoid (%+.2f*)%.0f kG, Dipole %s (%+.2f) %s", |
128 | factorSol,(fMapType==k5kG||fMapType==k5kGUniform)?5.:2., | |
439b5096 | 129 | fDipoleOFF ? "OFF":"ON",factorDip,fMapType==k5kGUniform?" |Constant Field!":"")); |
130 | AliInfo(Form("Machine B fields for %s beam (%.0f GeV): QGrad: %.4f Dipole: %.4f", | |
131 | bt==kBeamTypeAA ? "A-A":(bt==kBeamTypepp ? "p-p":"OFF"),be,fQuadGradient,fDipoleField)); | |
fe4da5cc | 132 | } |
133 | ||
eeda4611 | 134 | //_______________________________________________________________________ |
135 | AliMagF::AliMagF(const AliMagF &src): | |
db83d72f | 136 | TVirtualMagField(src), |
137 | fMeasuredMap(0), | |
138 | fMapType(src.fMapType), | |
139 | fSolenoid(src.fSolenoid), | |
140 | fBeamType(src.fBeamType), | |
141 | fBeamEnergy(src.fBeamEnergy), | |
eeda4611 | 142 | fInteg(src.fInteg), |
143 | fPrecInteg(src.fPrecInteg), | |
db83d72f | 144 | fFactorSol(src.fFactorSol), |
145 | fFactorDip(src.fFactorDip), | |
eeda4611 | 146 | fMax(src.fMax), |
db83d72f | 147 | fDipoleOFF(src.fDipoleOFF), |
148 | fQuadGradient(src.fQuadGradient), | |
149 | fDipoleField(src.fDipoleField), | |
150 | fCCorrField(src.fCCorrField), | |
151 | fACorr1Field(src.fACorr1Field), | |
152 | fACorr2Field(src.fACorr2Field), | |
153 | fParNames(src.fParNames) | |
eeda4611 | 154 | { |
db83d72f | 155 | if (src.fMeasuredMap) fMeasuredMap = new AliMagWrapCheb(*src.fMeasuredMap); |
eeda4611 | 156 | } |
157 | ||
e2afb3b6 | 158 | //_______________________________________________________________________ |
db83d72f | 159 | AliMagF::~AliMagF() |
ff66b122 | 160 | { |
db83d72f | 161 | delete fMeasuredMap; |
162 | } | |
163 | ||
164 | //_______________________________________________________________________ | |
165 | Bool_t AliMagF::LoadParameterization() | |
166 | { | |
167 | if (fMeasuredMap) { | |
168 | AliError(Form("Field data %s are already loaded from %s\n",GetParamName(),GetDataFileName())); | |
169 | return kTRUE; | |
170 | } | |
ff66b122 | 171 | // |
db83d72f | 172 | char* fname = gSystem->ExpandPathName(GetDataFileName()); |
173 | TFile* file = TFile::Open(fname); | |
174 | if (!file) { | |
175 | AliError(Form("Failed to open magnetic field data file %s\n",fname)); | |
176 | return kFALSE; | |
177 | } | |
ff66b122 | 178 | // |
db83d72f | 179 | fMeasuredMap = dynamic_cast<AliMagWrapCheb*>(file->Get(GetParamName())); |
180 | if (!fMeasuredMap) { | |
181 | AliError(Form("Did not find field %s in %s\n",GetParamName(),fname)); | |
182 | return kFALSE; | |
183 | } | |
184 | file->Close(); | |
185 | delete file; | |
186 | return kTRUE; | |
ff66b122 | 187 | } |
188 | ||
db83d72f | 189 | |
ff66b122 | 190 | //_______________________________________________________________________ |
db83d72f | 191 | void AliMagF::Field(const Double_t *xyz, Double_t *b) |
fe4da5cc | 192 | { |
db83d72f | 193 | // Method to calculate the field at point xyz |
aee8290b | 194 | // |
9251fceb | 195 | // b[0]=b[1]=b[2]=0.0; |
196 | if (fMeasuredMap && xyz[2]>fMeasuredMap->GetMinZ() && xyz[2]<fMeasuredMap->GetMaxZ()) { | |
db83d72f | 197 | fMeasuredMap->Field(xyz,b); |
198 | if (xyz[2]>fgkSol2DipZ || fDipoleOFF) for (int i=3;i--;) b[i] *= fFactorSol; | |
9251fceb | 199 | else for (int i=3;i--;) b[i] *= fFactorDip; |
db83d72f | 200 | } |
9251fceb | 201 | else MachineField(xyz, b); |
aee8290b | 202 | // |
fe4da5cc | 203 | } |
eeda4611 | 204 | |
205 | //_______________________________________________________________________ | |
db83d72f | 206 | Double_t AliMagF::GetBz(const Double_t *xyz) const |
eeda4611 | 207 | { |
db83d72f | 208 | // Method to calculate the field at point xyz |
209 | // | |
9251fceb | 210 | if (fMeasuredMap && xyz[2]>fMeasuredMap->GetMinZ() && xyz[2]<fMeasuredMap->GetMaxZ()) { |
211 | double bz = fMeasuredMap->GetBz(xyz); | |
212 | return (xyz[2]>fgkSol2DipZ || fDipoleOFF) ? bz*fFactorSol : bz*fFactorDip; | |
db83d72f | 213 | } |
9251fceb | 214 | else return 0.; |
eeda4611 | 215 | } |
216 | ||
217 | //_______________________________________________________________________ | |
db83d72f | 218 | AliMagF& AliMagF::operator=(const AliMagF& src) |
eeda4611 | 219 | { |
db83d72f | 220 | if (this != &src && src.fMeasuredMap) { |
221 | if (fMeasuredMap) delete fMeasuredMap; | |
222 | fMeasuredMap = new AliMagWrapCheb(*src.fMeasuredMap); | |
223 | SetName(src.GetName()); | |
224 | fSolenoid = src.fSolenoid; | |
225 | fBeamType = src.fBeamType; | |
226 | fBeamEnergy = src.fBeamEnergy; | |
db83d72f | 227 | fInteg = src.fInteg; |
228 | fPrecInteg = src.fPrecInteg; | |
229 | fFactorSol = src.fFactorSol; | |
230 | fFactorDip = src.fFactorDip; | |
231 | fMax = src.fMax; | |
232 | fDipoleOFF = src.fDipoleOFF; | |
233 | fParNames = src.fParNames; | |
234 | } | |
235 | return *this; | |
eeda4611 | 236 | } |
237 | ||
238 | //_______________________________________________________________________ | |
db83d72f | 239 | void AliMagF::InitMachineField(BeamType_t btype, Double_t benergy) |
eeda4611 | 240 | { |
9251fceb | 241 | if (btype==kNoBeamField || benergy<1.) { |
db83d72f | 242 | fQuadGradient = fDipoleField = fCCorrField = fACorr1Field = fACorr2Field = 0.; |
9251fceb | 243 | return; |
db83d72f | 244 | } |
245 | // | |
9251fceb | 246 | double rigScale = benergy/7000.; // scale according to ratio of E/Enominal |
247 | // for ions assume PbPb (with energy provided per nucleon) and account for A/Z | |
248 | if (btype == kBeamTypeAA) rigScale *= 208./82.; | |
249 | // | |
250 | fQuadGradient = 22.0002*rigScale; | |
251 | fDipoleField = 37.8781*rigScale; | |
252 | // | |
253 | // SIDE C | |
254 | fCCorrField = -9.6980; | |
255 | // SIDE A | |
256 | fACorr1Field = -13.2247; | |
257 | fACorr2Field = 11.7905; | |
db83d72f | 258 | // |
eeda4611 | 259 | } |
eed8a1a2 | 260 | |
db83d72f | 261 | //_______________________________________________________________________ |
262 | void AliMagF::MachineField(const Double_t *x, Double_t *b) const | |
eed8a1a2 | 263 | { |
db83d72f | 264 | // ---- This is the ZDC part |
9251fceb | 265 | // Compansators for Alice Muon Arm Dipole |
266 | const Double_t kBComp1CZ = 1075., kBComp1hDZ = 260./2., kBComp1SqR = 4.0*4.0; | |
267 | const Double_t kBComp2CZ = 2049., kBComp2hDZ = 153./2., kBComp2SqR = 4.5*4.5; | |
268 | // | |
269 | const Double_t kTripQ1CZ = 2615., kTripQ1hDZ = 637./2., kTripQ1SqR = 3.5*3.5; | |
90ae20c9 | 270 | const Double_t kTripQ2CZ = 3480., kTripQ2hDZ = 550./2., kTripQ2SqR = 3.5*3.5; |
9251fceb | 271 | const Double_t kTripQ3CZ = 4130., kTripQ3hDZ = 550./2., kTripQ3SqR = 3.5*3.5; |
272 | const Double_t kTripQ4CZ = 5015., kTripQ4hDZ = 637./2., kTripQ4SqR = 3.5*3.5; | |
db83d72f | 273 | // |
9251fceb | 274 | const Double_t kDip1CZ = 6310.8, kDip1hDZ = 945./2., kDip1SqRC = 4.5*4.5, kDip1SqRA = 3.375*3.375; |
275 | const Double_t kDip2CZ = 12640.3, kDip2hDZ = 945./2., kDip2SqRC = 4.5*4.5, kDip2SqRA = 3.75*3.75; | |
276 | const Double_t kDip2DXC = 9.7, kDip2DXA = 9.4; | |
db83d72f | 277 | // |
278 | double rad2 = x[0] * x[0] + x[1] * x[1]; | |
279 | // | |
9251fceb | 280 | b[0] = b[1] = b[2] = 0; |
281 | // | |
db83d72f | 282 | // SIDE C ************************************************** |
283 | if(x[2]<0.){ | |
9251fceb | 284 | if(TMath::Abs(x[2]+kBComp2CZ)<kBComp2hDZ && rad2 < kBComp2SqR){ |
285 | b[0] = fCCorrField*fFactorDip; | |
db83d72f | 286 | } |
9251fceb | 287 | else if(TMath::Abs(x[2]+kTripQ1CZ)<kTripQ1hDZ && rad2 < kTripQ1SqR){ |
db83d72f | 288 | b[0] = fQuadGradient*x[1]; |
289 | b[1] = fQuadGradient*x[0]; | |
db83d72f | 290 | } |
9251fceb | 291 | else if(TMath::Abs(x[2]+kTripQ2CZ)<kTripQ2hDZ && rad2 < kTripQ2SqR){ |
db83d72f | 292 | b[0] = -fQuadGradient*x[1]; |
293 | b[1] = -fQuadGradient*x[0]; | |
db83d72f | 294 | } |
9251fceb | 295 | else if(TMath::Abs(x[2]+kTripQ3CZ)<kTripQ3hDZ && rad2 < kTripQ3SqR){ |
db83d72f | 296 | b[0] = -fQuadGradient*x[1]; |
297 | b[1] = -fQuadGradient*x[0]; | |
db83d72f | 298 | } |
9251fceb | 299 | else if(TMath::Abs(x[2]+kTripQ4CZ)<kTripQ4hDZ && rad2 < kTripQ4SqR){ |
db83d72f | 300 | b[0] = fQuadGradient*x[1]; |
301 | b[1] = fQuadGradient*x[0]; | |
db83d72f | 302 | } |
9251fceb | 303 | else if(TMath::Abs(x[2]+kDip1CZ)<kDip1hDZ && rad2 < kDip1SqRC){ |
db83d72f | 304 | b[1] = fDipoleField; |
db83d72f | 305 | } |
9251fceb | 306 | else if(TMath::Abs(x[2]+kDip2CZ)<kDip2hDZ && rad2 < kDip2SqRC) { |
307 | double dxabs = TMath::Abs(x[0])-kDip2DXC; | |
308 | if ( (dxabs*dxabs + x[1]*x[1])<kDip2SqRC) { | |
db83d72f | 309 | b[1] = -fDipoleField; |
db83d72f | 310 | } |
311 | } | |
312 | } | |
313 | // | |
314 | // SIDE A ************************************************** | |
315 | else{ | |
9251fceb | 316 | if(TMath::Abs(x[2]-kBComp1CZ)<kBComp1hDZ && rad2 < kBComp1SqR) { |
db83d72f | 317 | // Compensator magnet at z = 1075 m |
9251fceb | 318 | b[0] = fACorr1Field*fFactorDip; |
db83d72f | 319 | } |
320 | // | |
9251fceb | 321 | if(TMath::Abs(x[2]-kBComp2CZ)<kBComp2hDZ && rad2 < kBComp2SqR){ |
322 | b[0] = fACorr2Field*fFactorDip; | |
323 | } | |
324 | else if(TMath::Abs(x[2]-kTripQ1CZ)<kTripQ1hDZ && rad2 < kTripQ1SqR){ | |
db83d72f | 325 | b[0] = -fQuadGradient*x[1]; |
326 | b[1] = -fQuadGradient*x[0]; | |
eed8a1a2 | 327 | } |
9251fceb | 328 | else if(TMath::Abs(x[2]-kTripQ2CZ)<kTripQ2hDZ && rad2 < kTripQ2SqR){ |
329 | b[0] = fQuadGradient*x[1]; | |
330 | b[1] = fQuadGradient*x[0]; | |
eed8a1a2 | 331 | } |
9251fceb | 332 | else if(TMath::Abs(x[2]-kTripQ3CZ)<kTripQ3hDZ && rad2 < kTripQ3SqR){ |
333 | b[0] = fQuadGradient*x[1]; | |
334 | b[1] = fQuadGradient*x[0]; | |
db83d72f | 335 | } |
9251fceb | 336 | else if(TMath::Abs(x[2]-kTripQ4CZ)<kTripQ4hDZ && rad2 < kTripQ4SqR){ |
db83d72f | 337 | b[0] = -fQuadGradient*x[1]; |
338 | b[1] = -fQuadGradient*x[0]; | |
db83d72f | 339 | } |
9251fceb | 340 | else if(TMath::Abs(x[2]-kDip1CZ)<kDip1hDZ && rad2 < kDip1SqRA){ |
db83d72f | 341 | b[1] = -fDipoleField; |
db83d72f | 342 | } |
9251fceb | 343 | else if(TMath::Abs(x[2]-kDip2CZ)<kDip2hDZ && rad2 < kDip2SqRA) { |
344 | double dxabs = TMath::Abs(x[0])-kDip2DXA; | |
345 | if ( (dxabs*dxabs + x[1]*x[1])<kDip2SqRA) { | |
db83d72f | 346 | b[1] = fDipoleField; |
347 | } | |
348 | } | |
349 | } | |
9251fceb | 350 | // |
db83d72f | 351 | } |
352 | ||
353 | //_______________________________________________________________________ | |
354 | void AliMagF::GetTPCInt(const Double_t *xyz, Double_t *b) const | |
355 | { | |
356 | // Method to calculate the integral of magnetic integral from xyz to nearest cathode plane | |
357 | b[0]=b[1]=b[2]=0.0; | |
358 | if (fMeasuredMap) { | |
359 | fMeasuredMap->GetTPCInt(xyz,b); | |
360 | for (int i=3;i--;) b[i] *= fFactorSol; | |
361 | } | |
362 | } | |
363 | ||
364 | //_______________________________________________________________________ | |
365 | void AliMagF::GetTPCIntCyl(const Double_t *rphiz, Double_t *b) const | |
366 | { | |
367 | // Method to calculate the integral of magnetic integral from point to nearest cathode plane | |
368 | // in cylindrical coordiates ( -pi<phi<pi convention ) | |
369 | b[0]=b[1]=b[2]=0.0; | |
370 | if (fMeasuredMap) { | |
371 | fMeasuredMap->GetTPCIntCyl(rphiz,b); | |
372 | for (int i=3;i--;) b[i] *= fFactorSol; | |
373 | } | |
eed8a1a2 | 374 | } |
1dd3d90e | 375 | |
376 | //_______________________________________________________________________ | |
377 | void AliMagF::SetFactorSol(Float_t fc) | |
378 | { | |
379 | // set the sign/scale of the current in the L3 according to fgkPolarityConvention | |
380 | switch (fgkPolarityConvention) { | |
381 | case kConvDCS2008: fFactorSol = -fc; break; | |
382 | case kConvLHC : fFactorSol = -fc; break; | |
383 | default : fFactorSol = fc; break; // case kConvMap2005: fFactorSol = fc; break; | |
384 | } | |
385 | } | |
386 | ||
387 | //_______________________________________________________________________ | |
388 | void AliMagF::SetFactorDip(Float_t fc) | |
389 | { | |
390 | // set the sign*scale of the current in the Dipole according to fgkPolarityConvention | |
391 | switch (fgkPolarityConvention) { | |
392 | case kConvDCS2008: fFactorDip = fc; break; | |
393 | case kConvLHC : fFactorDip = -fc; break; | |
394 | default : fFactorDip = fc; break; // case kConvMap2005: fFactorDip = fc; break; | |
395 | } | |
396 | } | |
397 | ||
398 | //_______________________________________________________________________ | |
399 | Double_t AliMagF::GetFactorSol() const | |
400 | { | |
401 | // return the sign*scale of the current in the Dipole according to fgkPolarityConventionthe | |
402 | switch (fgkPolarityConvention) { | |
403 | case kConvDCS2008: return -fFactorSol; | |
404 | case kConvLHC : return -fFactorSol; | |
405 | default : return fFactorSol; // case kConvMap2005: return fFactorSol; | |
406 | } | |
407 | } | |
408 | ||
409 | //_______________________________________________________________________ | |
410 | Double_t AliMagF::GetFactorDip() const | |
411 | { | |
412 | // return the sign*scale of the current in the Dipole according to fgkPolarityConventionthe | |
413 | switch (fgkPolarityConvention) { | |
414 | case kConvDCS2008: return fFactorDip; | |
415 | case kConvLHC : return -fFactorDip; | |
416 | default : return fFactorDip; // case kConvMap2005: return fFactorDip; | |
417 | } | |
418 | } |