3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
7 // Interface between the TVirtualMagField and AliMagWrapCheb: wrapper to
8 // the set of magnetic field data + Tosca parameterization by
9 // Chebyshev polynomials
11 // Author: ruben.shahoyan@cern.ch
14 //#include <TGeoGlobalMagField.h>
15 #include <TVirtualMagField.h>
18 class AliMagF : public TVirtualMagField
21 enum BMap_t {k2kG, k5kG, k5kGUniform};
22 enum BeamType_t {kNoBeamField, kBeamTypepp, kBeamTypeAA};
23 enum PolarityConvention_t {kConvLHC,kConvDCS2008,kConvMap2005};
24 enum {kOverrideGRP=BIT(14)}; // don't recreate from GRP if set
27 AliMagF(const char *name, const char* title, Int_t integ,
28 Double_t factorSol=1., Double_t factorDip=1.,
29 Double_t fmax=15, BMap_t maptype = k5kG,
30 const char* path="$(ALICE_ROOT)/data/maps/mfchebKGI_sym.root",
31 BeamType_t btype=kBeamTypepp, Double_t benergy=7000.);
32 AliMagF(const AliMagF& src);
33 AliMagF& operator=(const AliMagF& src);
36 virtual void Field(const Double_t *x, Double_t *b);
37 void GetTPCInt(const Double_t *xyz, Double_t *b) const;
38 void GetTPCIntCyl(const Double_t *rphiz, Double_t *b) const;
39 Double_t GetBz(const Double_t *xyz) const;
41 AliMagWrapCheb* GetMeasuredMap() const {return fMeasuredMap;}
43 // former AliMagF methods or their aliases
44 void SetFactorSol(Float_t fc=1.);
45 void SetFactorDip(Float_t fc=1.);
46 Double_t GetFactorSol() const;
47 Double_t GetFactorDip() const;
48 Double_t Factor() const {return GetFactorSol();}
49 Double_t GetCurrentSol() const {return GetFactorSol()*(fMapType==k2kG ? 12000:30000);}
50 Double_t GetCurrentDip() const {return GetFactorDip()*6000;}
51 Bool_t IsUniform() const {return fMapType == k5kGUniform;}
53 void MachineField(const Double_t *x, Double_t *b) const;
54 BMap_t GetMapType() const {return fMapType;}
55 BeamType_t GetBeamType() const {return fBeamType;}
56 const char* GetBeamTypeText() const;
57 Double_t GetBeamEnergy() const {return fBeamEnergy;}
58 Double_t Max() const {return fMax;}
59 Int_t Integ() const {return fInteg;}
60 Int_t PrecInteg() const {return fPrecInteg;}
61 Double_t SolenoidField() const {return fFactorSol*fSolenoid;}
63 Char_t* GetDataFileName() const {return (Char_t*)fParNames.GetName();}
64 Char_t* GetParamName() const {return (Char_t*)fParNames.GetTitle();}
65 void SetDataFileName(const Char_t* nm) {fParNames.SetName(nm);}
66 void SetParamName(const Char_t* nm) {fParNames.SetTitle(nm);}
68 Bool_t LoadParameterization();
69 static Int_t GetPolarityConvention() {return Int_t(fgkPolarityConvention);}
70 static AliMagF* CreateFieldMap(Float_t l3Current=-30000., Float_t diCurrent=-6000.,
71 Int_t convention=0, Bool_t uniform = kFALSE,
72 Float_t benergy=7000., const Char_t* btype="pp",
73 const Char_t* path="$(ALICE_ROOT)/data/maps/mfchebKGI_sym.root");
76 // not supposed to be changed during the run, set only at the initialization via constructor
77 void InitMachineField(BeamType_t btype, Double_t benergy);
78 void SetBeamType(BeamType_t type) {fBeamType = type;}
79 void SetBeamEnergy(Float_t energy) {fBeamEnergy = energy;}
82 AliMagWrapCheb* fMeasuredMap; //! Measured part of the field map
83 BMap_t fMapType; // field map type
84 Double_t fSolenoid; // Solenoid field setting
85 BeamType_t fBeamType; // Beam type: A-A (fBeamType=0) or p-p (fBeamType=1)
86 Double_t fBeamEnergy; // Beam energy in GeV
88 Int_t fInteg; // Default integration method as indicated in Geant
89 Int_t fPrecInteg; // Alternative integration method, e.g. for higher precision
90 Double_t fFactorSol; // Multiplicative factor for solenoid
91 Double_t fFactorDip; // Multiplicative factor for dipole
92 Double_t fMax; // Max Field as indicated in Geant
93 Bool_t fDipoleOFF; // Dipole ON/OFF flag
95 Double_t fQuadGradient; // Gradient field for inner triplet quadrupoles
96 Double_t fDipoleField; // Field value for D1 and D2 dipoles
97 Double_t fCCorrField; // Side C 2nd compensator field
98 Double_t fACorr1Field; // Side A 1st compensator field
99 Double_t fACorr2Field; // Side A 2nd compensator field
101 TNamed fParNames; // file and parameterization loadad
103 static const Double_t fgkSol2DipZ; // conventional Z of transition from L3 to Dipole field
104 static const UShort_t fgkPolarityConvention; // convention for the mapping of the curr.sign on main component sign
106 ClassDef(AliMagF, 2) // Class for all Alice MagField wrapper for measured data + Tosca parameterization