PolyFit3DParametrizedMagneticField Class Reference

#include <PolyFit3DParametrizedMagneticField.h>

Inheritance diagram for PolyFit3DParametrizedMagneticField:

List of all members.

Public Member Functions
GlobalVector	inTesla (const GlobalPoint &gp) const
	Field value ad specified global point, in Tesla.
GlobalVector	inTeslaUnchecked (const GlobalPoint &gp) const
bool	isDefined (const GlobalPoint &gp) const
	True if the point is within the region where the concrete field.
	PolyFit3DParametrizedMagneticField (const edm::ParameterSet &parameters)
	Constructor. Parameters taken from a PSet.
	PolyFit3DParametrizedMagneticField (double bVal=3.8114)
virtual	~PolyFit3DParametrizedMagneticField ()
	Destructor.
Private Attributes
magfieldparam::BFit3D *	theParam

---

Detailed Description

Magnetic Field engine wrapper for V. Maroussov's 3D parametrization of the MT data.

Date:

2011/04/16 10:20:40

Revision:

1.1

Author:

N. Amapane

Definition at line 20 of file PolyFit3DParametrizedMagneticField.h.

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Constructor & Destructor Documentation

PolyFit3DParametrizedMagneticField::PolyFit3DParametrizedMagneticField

(

double

bVal = 3.8114

)

Constructor. Fitted bVal for the nominal currents are: 2.0216; 3.5162; 3.8114; 4.01242188708911

Definition at line 18 of file PolyFit3DParametrizedMagneticField.cc.

References magfieldparam::BFit3D::SetField(), and theParam.

                                                                                  : 
  theParam(new BFit3D())
{
  theParam->SetField(bVal);
}

PolyFit3DParametrizedMagneticField::PolyFit3DParametrizedMagneticField

(

const edm::ParameterSet &

parameters

)

Constructor. Parameters taken from a PSet.

Definition at line 25 of file PolyFit3DParametrizedMagneticField.cc.

References edm::ParameterSet::getParameter(), magfieldparam::BFit3D::SetField(), and theParam.

                                                                                                        : theParam(new BFit3D()) {
  theParam->SetField(parameters.getParameter<double>("BValue"));

  // Additional options (documentation by Vassili):

  // By default, the package accepts signed value of "r". That means,
  // one can cross r=0 and orientation of the coordinate "orts"
  // e_r and e_phi will not be flipped over.
  // In other words for an r<0 the e_r points inward, in the direction r=0.
  // This is a "natural" mode. However, the default behavior may be
  // changed by the call

  //  theParam->UseSignedRad(false);
  
  // In that case with crossing of r=0 e_r and e_phi will be flipped in
  // such a way that e_r always points outward. In other words instead of 
  // (r<0, phi) the (abs(r), phi+PI) will be used in this mode.

  // The expansion coefficients for a nominal field in between measurement
  // field values (2.0T, 3.5T, 3.8T and 4.0T) by default are calculated by
  // means of a linear piecewise interpolation. Another provided
  // interpolation mode is cubic spline. This mode can be switched
  // on by the call:

  //  theParam->UseSpline(true);

  // From practical point of view the use of spline interpolation doesn't
  // change much, but it makes the coefficients' behavior a bit more
  // physical at very low/high field values.
}

PolyFit3DParametrizedMagneticField::~PolyFit3DParametrizedMagneticField

(

)

[virtual]

Destructor.

Definition at line 57 of file PolyFit3DParametrizedMagneticField.cc.

References theParam.

                                                                        {
  delete theParam;
}

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Member Function Documentation

GlobalVector PolyFit3DParametrizedMagneticField::inTesla

(

const GlobalPoint &

gp

)

const [virtual]

Field value ad specified global point, in Tesla.

Implements MagneticField.

Definition at line 63 of file PolyFit3DParametrizedMagneticField.cc.

References inTeslaUnchecked(), and isDefined().

                                                                       {

  if (isDefined(gp)) {
    return inTeslaUnchecked(gp);
  } else {
    edm::LogWarning("MagneticField|FieldOutsideValidity") << " Point " << gp << " is outside the validity region of PolyFit3DParametrizedMagneticField";
    return GlobalVector();
  }
}

GlobalVector PolyFit3DParametrizedMagneticField::inTeslaUnchecked

(

const GlobalPoint &

gp

)

const [virtual]

Optional implementation that derived classes can implement to provide faster query by skipping the check to isDefined.

Reimplemented from MagneticField.

Definition at line 74 of file PolyFit3DParametrizedMagneticField.cc.

References funct::cos(), magfieldparam::BFit3D::GetField(), PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::phi(), funct::sin(), theParam, and PV3DBase< T, PVType, FrameType >::z().

Referenced by inTesla().

                                                                                {
  double Br, Bz, Bphi;
  theParam->GetField(gp.perp()/100., gp.z()/100., gp.phi(),
                     Br, Bz, Bphi);

  double cosphi = cos(gp.phi());
  double sinphi = sin(gp.phi());

  return GlobalVector(Br*cosphi - Bphi*sinphi,
                      Br*sinphi + Bphi*cosphi, 
                      Bz);  
}

bool PolyFit3DParametrizedMagneticField::isDefined

(

const GlobalPoint &

gp

)

const [virtual]

True if the point is within the region where the concrete field.

Reimplemented from MagneticField.

Definition at line 88 of file PolyFit3DParametrizedMagneticField.cc.

References PV3DBase< T, PVType, FrameType >::perp(), alignCSCRings::r, PV3DBase< T, PVType, FrameType >::z(), and z.

Referenced by inTesla().

                                                                         {
  double z = fabs(gp.z());
  double r = gp.perp();
  //"rectangle" |z|<3.5, r<1.9 _except_ the "corners" |z|+2.5*r>6.7, everything in meters
  if (z>350. || r>190 || z+2.5*r>670.) return false;
  return true;
}

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Member Data Documentation

magfieldparam::BFit3D* PolyFit3DParametrizedMagneticField::theParam [private]

Definition at line 39 of file PolyFit3DParametrizedMagneticField.h.

Referenced by inTeslaUnchecked(), PolyFit3DParametrizedMagneticField(), and ~PolyFit3DParametrizedMagneticField().