OAE85lParametrizedMagneticField Class Reference

#include <OAE85lParametrizedMagneticField.h>

Inheritance diagram for OAE85lParametrizedMagneticField:

Public Member Functions
GlobalVector	inTesla (const GlobalPoint &gp) const
	Field value ad specified global point, in Tesla. More...
GlobalVector	inTeslaUnchecked (const GlobalPoint &gp) const
bool	isDefined (const GlobalPoint &gp) const
	True if the point is within the region where the concrete field. More...
	OAE85lParametrizedMagneticField (float b0_=40.681, float a_=4.6430, float l_=15.284)
	OAE85lParametrizedMagneticField (const edm::ParameterSet &parameters)
	Constructor. Parameters taken from a PSet. More...
virtual	~OAE85lParametrizedMagneticField ()
	Destructor. More...
Public Member Functions inherited from MagneticField
virtual MagneticField *	clone () const
GlobalVector	inInverseGeV (const GlobalPoint &gp) const
	Field value ad specified global point, in 1/Gev. More...
GlobalVector	inKGauss (const GlobalPoint &gp) const
	Field value ad specified global point, in KGauss. More...
	MagneticField ()
	MagneticField (const MagneticField &orig)
int	nominalValue () const
	The nominal field value for this map in kGauss. More...
virtual	~MagneticField ()

Private Member Functions
void	ffunkti (float u, float *ff) const
void	init ()

Private Attributes
float	a
float	ainv
float	ap2
float	b0
float	hb0
float	hlova
float	l

Detailed Description

Magnetic Field engine wrapper for V. Karimaki's "off-axis expansion" of the TOSCA field version 85l_030919 (4 T) valid in the region r<1.2 m and |z|<3.0 m

Author

N. Amapane - CERN

Definition at line 17 of file OAE85lParametrizedMagneticField.h.

Constructor & Destructor Documentation

OAE85lParametrizedMagneticField::OAE85lParametrizedMagneticField	(	float	b0_ = 40.681,
		float	a_ = 4.6430,
		float	l_ = 15.284
	)

Constructor. The optional parameters are: b0=field at centre, l=solenoid length, a=radius (m)

Definition at line 16 of file OAE85lParametrizedMagneticField.cc.

References init().

  : b0(b0_),
    l(l_),
    a(a_)    
{
  init();
}

OAE85lParametrizedMagneticField::OAE85lParametrizedMagneticField

(

const edm::ParameterSet &

parameters

)

Constructor. Parameters taken from a PSet.

Definition at line 27 of file OAE85lParametrizedMagneticField.cc.

References a, b0, edm::ParameterSet::getParameter(), init(), and l.

                                                                                                  {
  b0 =  parameters.getParameter<double>("b0");
  l = parameters.getParameter<double>("l");
  a = parameters.getParameter<double>("a");
  init();
}

OAE85lParametrizedMagneticField::~OAE85lParametrizedMagneticField ( )

virtual

Destructor.

Definition at line 43 of file OAE85lParametrizedMagneticField.cc.

{}

Member Function Documentation

void OAE85lParametrizedMagneticField::ffunkti ( float  u, float *  ff  ) const

private

Definition at line 118 of file OAE85lParametrizedMagneticField.cc.

References a, b, and mathSSE::sqrt().

Referenced by inTeslaUnchecked().

                                                                      {
// Function and its 3 derivatives
 float a,b; 
 a=1.0/(1.0+u*u);
 b=sqrt(a);
 ff[0]=u*b;
 ff[1]=a*b;
 ff[2]=-3.0*u*a*ff[1];
 ff[3]=a*ff[2]*((1.0/u)-4.0*u);
 return;
}

void OAE85lParametrizedMagneticField::init ( void  )

private

Definition at line 34 of file OAE85lParametrizedMagneticField.cc.

References a, ainv, ap2, b0, hb0, hlova, l, and mathSSE::sqrt().

Referenced by OAE85lParametrizedMagneticField().

                                           {
  ap2=4.0*a*a/(l*l);  
  hb0=0.5*b0*sqrt(1.0+ap2);
  hlova=1.0/sqrt(ap2);
  ainv=2.0*hlova/l;
}

GlobalVector OAE85lParametrizedMagneticField::inTesla ( const GlobalPoint &  gp ) const

virtual

Field value ad specified global point, in Tesla.

Implements MagneticField.

Definition at line 47 of file OAE85lParametrizedMagneticField.cc.

References inTeslaUnchecked(), and isDefined().

                                                                    {
  
  if (isDefined(gp)) {
    return inTeslaUnchecked(gp);
  } else {
    edm::LogWarning("MagneticField|FieldOutsideValidity") << " Point " << gp << " is outside the validity region of OAE85lParametrizedMagneticField";
    return GlobalVector();
  }
}

GlobalVector OAE85lParametrizedMagneticField::inTeslaUnchecked ( const GlobalPoint &  gp ) const

virtual

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

GlobalVector bresult(br*xyz[0]*rinv, br*xyz[1]*rinv, bz);

Reimplemented from MagneticField.

Definition at line 59 of file OAE85lParametrizedMagneticField.cc.

References ainv, beamvalidation::br, create_public_lumi_plots::exp, ffunkti(), hb0, hlova, alignCSCRings::r, mathSSE::sqrt(), findQualityFiles::v, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), detailsBasic3DVector::z, and PV3DBase< T, PVType, FrameType >::z().

Referenced by inTesla().

                                                                             {
  
// Method formerly named "trackerField"

//
//    B-field in Tracker volume
//    
//     In:   xyz[3]: coordinates (m)
//    Out:  bxyz[3]: Bx,By,Bz    (kG)
//
//    Valid for r<1.2 and |z|<3.0               V.Karimäki 040301
//                                 Updated for CMSSW field 070424
//

// b0=field at centre, l=solenoid length, a=radius (m) (phenomen. parameters) 

  // FIXME: beware of statics...
//  static float ap2=4.0*a*a/(l*l);  
//  static float hb0=0.5*b0*sqrt(1.0+ap2);
//  static float hlova=1.0/sqrt(ap2);
//  static float ainv=2.0*hlova/l;
 float xyz[3];//, bxyz[3];
 // convert to m (CMSSW)
 xyz[0]=0.01*gp.x();
 xyz[1]=0.01*gp.y();
 xyz[2]=0.01*gp.z();

 float r=sqrt(xyz[0]*xyz[0]+xyz[1]*xyz[1]);
 float z=xyz[2];
 float az = fabs(z);
 // if (r<1.2&&az<3.0) // NOTE: check omitted, is done already by inTesla (NA)
 {
  float zainv=z*ainv;
  float rinv=(r>0.0) ? 1.0/r : 0.0;
  float u=hlova-zainv;
  float v=hlova+zainv;
  float fu[5],gv[5];
  ffunkti(u,fu);
  ffunkti(v,gv);
  float rat=r*ainv;
  float corrr=0.00894*r*z*(az-2.2221)*(az-2.2221);
  float corrz=-0.02996*exp(-0.5*(az-1.9820)*(az-1.9820)/(0.78915*0.78915));
  float br=hb0*0.5*rat*(fu[1]-gv[1]-0.125*(fu[3]-gv[3])*rat*rat)+corrr;
  float bz=hb0*(fu[0]+gv[0]-(fu[2]+gv[2])*0.25*rat*rat)+corrz;
  //bxyz[0]=br*xyz[0]*rinv;
  //bxyz[1]=br*xyz[1]*rinv;
  //bxyz[2]=bz;
  //  bvec.x()=0.1*br*xyz[0]*rinv;
  //bvec.y()=0.1*br*xyz[1]*rinv;
  //bvec.z()=0.1*bz;
  return  0.1*GlobalVector(br*xyz[0]*rinv, br*xyz[1]*rinv, bz);
 }
 // else {
 // cout <<"The point is outside the region r<1.2m && |z|<3.0m"<<endl;
 //}
 // return GlobalVector();
}

bool OAE85lParametrizedMagneticField::isDefined ( const GlobalPoint &  gp ) const

virtual

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

Reimplemented from MagneticField.

Definition at line 132 of file OAE85lParametrizedMagneticField.cc.

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

Referenced by inTesla().

                                                                      {
  return (gp.perp()<120. && fabs(gp.z())<300.);
}

Member Data Documentation

float OAE85lParametrizedMagneticField::a

private

Definition at line 49 of file OAE85lParametrizedMagneticField.h.

Referenced by ffunkti(), init(), and OAE85lParametrizedMagneticField().

float OAE85lParametrizedMagneticField::ainv

private

Definition at line 54 of file OAE85lParametrizedMagneticField.h.

Referenced by init(), and inTeslaUnchecked().

float OAE85lParametrizedMagneticField::ap2

private

Definition at line 51 of file OAE85lParametrizedMagneticField.h.

Referenced by init().

float OAE85lParametrizedMagneticField::b0

private

Definition at line 47 of file OAE85lParametrizedMagneticField.h.

Referenced by init(), and OAE85lParametrizedMagneticField().

float OAE85lParametrizedMagneticField::hb0

private

Definition at line 52 of file OAE85lParametrizedMagneticField.h.

Referenced by init(), and inTeslaUnchecked().

float OAE85lParametrizedMagneticField::hlova

private

Definition at line 53 of file OAE85lParametrizedMagneticField.h.

Referenced by init(), and inTeslaUnchecked().

float OAE85lParametrizedMagneticField::l

private

Definition at line 48 of file OAE85lParametrizedMagneticField.h.

Referenced by init(), and OAE85lParametrizedMagneticField().