magfieldparam::BFit3D Class Reference

#include <BFit3D.h>

Public Member Functions
	BFit3D ()
double	GetBnom ()
double	GetBphi_k (const unsigned k)
double	GetBr_k (const unsigned k)
double	GetBz_k (const unsigned k)
double	GetC (const int k)
void	GetField (const double r, const double z, const double phi, double &Br, double &Bz, double &Bphi)
unsigned	GetLen ()
void	PrintBphiPoly (std::ostream &out=std::cout)
void	PrintBrPoly (std::ostream &out=std::cout)
void	PrintBzPoly (std::ostream &out=std::cout)
void	PrintPoly (std::ostream &out=std::cout)
void	PrintPtnPoly (std::ostream &out=std::cout)
void	SetField (const double B)
void	UseSignedRad (const bool flag=true)
void	UseSpline (const bool flag=true)
virtual	~BFit3D ()

Private Member Functions
void	SetCoeff_Linear (const double B)
void	SetCoeff_Spline (const double B)

Private Attributes
double	B_set
double	C [360]
HarmBasis3DCyl *	HB
bool	signed_rad
bool	use_spline

Static Private Attributes
static const double	B_nom [4]
static const double	C0 [360][4]
static const double	C1 [360][5]
static const double	C2 [360][3]

Detailed Description

Definition at line 9 of file BFit3D.h.

Constructor & Destructor Documentation

magfieldparam::BFit3D::BFit3D ( )

inline

Definition at line 35 of file BFit3D.h.

            : use_spline(false), signed_rad(true), B_set(0.), 
              HB(new HarmBasis3DCyl(18)) {}

virtual magfieldparam::BFit3D::~BFit3D ( )

inlinevirtual

Definition at line 38 of file BFit3D.h.

References HB.

{ delete HB;}

Member Function Documentation

double magfieldparam::BFit3D::GetBnom ( )

inline

Definition at line 59 of file BFit3D.h.

References B_set.

{ return B_set;}         //Ret. nominal field

double magfieldparam::BFit3D::GetBphi_k ( const unsigned  k )

inline

Definition at line 66 of file BFit3D.h.

References magfieldparam::HarmBasis3DCyl::GetBphi_k(), and HB.

{ return HB->GetBphi_k(k);}

double magfieldparam::BFit3D::GetBr_k ( const unsigned  k )

inline

Definition at line 64 of file BFit3D.h.

References magfieldparam::HarmBasis3DCyl::GetBr_k(), and HB.

{ return HB->GetBr_k  (k);}

double magfieldparam::BFit3D::GetBz_k ( const unsigned  k )

inline

Definition at line 65 of file BFit3D.h.

References magfieldparam::HarmBasis3DCyl::GetBz_k(), and HB.

{ return HB->GetBz_k  (k);}

double magfieldparam::BFit3D::GetC ( const int  k )

inline

Definition at line 60 of file BFit3D.h.

References C, and relval_steps::k.

{ return C[k];}  //Ret. k-th expansion coefficient

void BFit3D::GetField	(	const double	r,
		const double	z,
		const double	phi,
		double &	Br,
		double &	Bz,
		double &	Bphi
	)

Definition at line 70 of file BFit3D.cc.

References C, magfieldparam::HarmBasis3DCyl::EvalBphi(), magfieldparam::HarmBasis3DCyl::EvalBr(), magfieldparam::HarmBasis3DCyl::EvalBz(), magfieldparam::HarmBasis3DCyl::GetBphi(), magfieldparam::HarmBasis3DCyl::GetBr(), magfieldparam::HarmBasis3DCyl::GetBz(), HB, M_PI, magfieldparam::HarmBasis3DCyl::SetPoint(), and signed_rad.

{
//Return field components in Br, Bz, Bphi. SetField must be called before use.
//
   if (signed_rad || (r >= 0.)) HB->SetPoint(r, z, phi);
   else HB->SetPoint(-r, z, phi+M_PI);
   HB->EvalBr();
   HB->EvalBz();
   HB->EvalBphi();
   Br   = HB->GetBr  (C);
   Bz   = HB->GetBz  (C);
   Bphi = HB->GetBphi(C);
}

unsigned magfieldparam::BFit3D::GetLen ( )

inline

Definition at line 58 of file BFit3D.h.

References magfieldparam::HarmBasis3DCyl::GetLen(), and HB.

{ return HB->GetLen();} //Ret. the basis length

void magfieldparam::BFit3D::PrintBphiPoly ( std::ostream &  out = std::cout )

inline

Definition at line 73 of file BFit3D.h.

References HB, dbtoconf::out, and magfieldparam::HarmBasis3DCyl::PrintBphiB().

{ HB->PrintBphiB(out);}

void magfieldparam::BFit3D::PrintBrPoly ( std::ostream &  out = std::cout )

inline

Definition at line 71 of file BFit3D.h.

References HB, dbtoconf::out, and magfieldparam::HarmBasis3DCyl::PrintBrB().

{ HB->PrintBrB  (out);}

void magfieldparam::BFit3D::PrintBzPoly ( std::ostream &  out = std::cout )

inline

Definition at line 72 of file BFit3D.h.

References HB, dbtoconf::out, and magfieldparam::HarmBasis3DCyl::PrintBzB().

{ HB->PrintBzB  (out);}

void magfieldparam::BFit3D::PrintPoly ( std::ostream &  out = std::cout )

inline

Definition at line 74 of file BFit3D.h.

References HB, dbtoconf::out, and magfieldparam::HarmBasis3DCyl::Print().

{ HB->Print     (out);}

void magfieldparam::BFit3D::PrintPtnPoly ( std::ostream &  out = std::cout )

inline

Definition at line 70 of file BFit3D.h.

References HB, dbtoconf::out, and magfieldparam::HarmBasis3DCyl::PrintPtB().

{ HB->PrintPtB  (out);}

void BFit3D::SetCoeff_Linear ( const double  B )

private

Definition at line 12 of file BFit3D.cc.

References B_nom, C, C0, findQualityFiles::jj, and GetRecoTauVFromDQM_MC_cff::kk.

Referenced by SetField().

{
   unsigned jj, kk = 1;
   double w_0, w_1, B_mod = fabs(B);
   if (B_mod <= B_nom[0]) {
      w_0 = B / B_nom[0];
      for (jj = 0; jj < 360; ++jj) {
         C[jj] = w_0*C0[jj][0];
      }
   } else if (B_mod >= B_nom[3]) {
      w_0 = B / B_nom[3];
      for (jj = 0; jj < 360; ++jj) {
         C[jj] = w_0*C0[jj][3];
      }
   } else {
      while (B_nom[kk] < B_mod) ++kk; //Simple linear search
      w_1 = (B_mod - B_nom[kk-1])/(B_nom[kk] - B_nom[kk-1]);
      w_0 = 1.0 - w_1;
      if (B < 0.) {
         w_0 = -w_0;
         w_1 = -w_1;
      }
      for (jj = 0; jj < 360; ++jj) {
         C[jj] = w_0*C0[jj][kk-1] + w_1*C0[jj][kk];
      }
   }
}

void BFit3D::SetCoeff_Spline ( const double  B )

private

Definition at line 41 of file BFit3D.cc.

References B_nom, C, C0, C1, C2, and reco::ParticleMasses::k0.

Referenced by SetField().

{
   int jc, k0 = 0, k1 = 1;
   double dB2, dB = fabs(B);
   if (dB >= B_nom[3]) { //Linear extrapolation for a large field
      dB -= B_nom[3];
      for (jc = 0; jc < 360; ++jc) C[jc] = C0[jc][3] + C1[jc][4]*dB;
   } else {
      if (dB < B_nom[0]) {
         dB2 = dB*dB / (3.*B_nom[0]);
         for (jc = 0; jc < 360; ++jc) C[jc] = (C2[jc][0]*dB2 + C1[jc][0])*dB;
      } else {
         while (B_nom[k1] < dB) ++k1; //Simple linear search
         k0 = k1-1;
         dB2 = (dB -= B_nom[k0]) / (3.*(B_nom[k1] - B_nom[k0]));
         if (k1 < 3) { //"Regular" interval
            for (jc = 0; jc < 360; ++jc)
               C[jc] = (((C2[jc][k1] - C2[jc][k0])*dB2+C2[jc][k0])*dB + C1[jc][k1])*dB + C0[jc][k0];
         } else {      //The last interval
            dB2 = (1.- dB2)*dB;
            for (jc = 0; jc < 360; ++jc)
               C[jc] = (C2[jc][k0]*dB2 + C1[jc][k1])*dB + C0[jc][k0];
         }
      }
   }
   if (B < 0) for (jc = 0; jc < 360; ++jc) C[jc] = -C[jc];
}

void magfieldparam::BFit3D::SetField ( const double  B )

inline

Definition at line 47 of file BFit3D.h.

References B_set, SetCoeff_Linear(), SetCoeff_Spline(), and use_spline.

                                 {
      if (use_spline) SetCoeff_Spline(B); else SetCoeff_Linear(B);
      B_set = B;
   }

void magfieldparam::BFit3D::UseSignedRad ( const bool  flag = true )

inline

Definition at line 44 of file BFit3D.h.

References signed_rad.

{ signed_rad = flag;}

void magfieldparam::BFit3D::UseSpline ( const bool  flag = true )

inline

Definition at line 41 of file BFit3D.h.

References use_spline.

{ use_spline = flag;}

Member Data Documentation

const double magfieldparam::BFit3D::B_nom

staticprivate

Initial value:

= 
   {  2.02156567013928,
      3.51622117206486,
      3.81143026675623, 
      4.01242188708911
   }

Definition at line 14 of file BFit3D.h.

Referenced by SetCoeff_Linear(), and SetCoeff_Spline().

double magfieldparam::BFit3D::B_set

private

Definition at line 23 of file BFit3D.h.

Referenced by GetBnom(), and SetField().

double magfieldparam::BFit3D::C[360]

private

Definition at line 19 of file BFit3D.h.

Referenced by GetC(), GetField(), SetCoeff_Linear(), and SetCoeff_Spline().

const double magfieldparam::BFit3D::C0

staticprivate

Definition at line 15 of file BFit3D.h.

Referenced by SetCoeff_Linear(), and SetCoeff_Spline().

const double magfieldparam::BFit3D::C1

staticprivate

Definition at line 16 of file BFit3D.h.

Referenced by SetCoeff_Spline().

const double magfieldparam::BFit3D::C2

staticprivate

Definition at line 17 of file BFit3D.h.

Referenced by SetCoeff_Spline().

HarmBasis3DCyl* magfieldparam::BFit3D::HB

private

Definition at line 25 of file BFit3D.h.

Referenced by GetBphi_k(), GetBr_k(), GetBz_k(), GetField(), GetLen(), PrintBphiPoly(), PrintBrPoly(), PrintBzPoly(), PrintPoly(), PrintPtnPoly(), and ~BFit3D().

bool magfieldparam::BFit3D::signed_rad

private

Definition at line 22 of file BFit3D.h.

Referenced by GetField(), and UseSignedRad().

bool magfieldparam::BFit3D::use_spline

private

Definition at line 21 of file BFit3D.h.

Referenced by SetField(), and UseSpline().