CDCBFieldUtil Class Reference

Helper functions to interact with the magnetic field. More...

#include <CDCBFieldUtil.h>

Static Public Member Functions
static bool	isOff ()
	Indicator if the magnetic field is off in the current geometry.
static ESign	getBFieldZSign ()
	Getter for the sign of the magnetic field in z direction.
static double	getBFieldZ ()
	Getter for the signed magnetic field stength in z direction at the origin ( in Tesla )
static double	getBFieldZ (const Vector2D &pos2D)
	Getter for the signed magnetic field stength in z direction ( in Tesla )
static double	getBFieldZ (const Vector3D &pos3D)
	Getter for the signed magnetic field stength in z direction ( in Tesla )
static double	getAlphaFromBField (double bField)
	Translater from magnetic field strength in Tesla to the alpha value.
static double	getAlphaZ (const Vector2D &pos2D)
	Getter for the signed alpha of the magnetic field in z direction.
static double	getAlphaZ (const Vector3D &pos3D)
	Getter for the signed alpha of the magnetic field in z direction.
static ESign	ccwInfoToChargeSign (ERotation ccwInfo)
	Conversion helper from clockwise or counterclockwise travel to the charge sign. More...
static ERotation	chargeSignToERotation (ESign chargeSign)
	Conversion helper from the charge sign to clockwise or counterclockwise travel.
static ERotation	chargeToERotation (double charge)
	Conversion help for charges to clockwise or counterclockwise travel.
static double	absMom2DToBendRadius (double absMom2D, double bZ)
	Conversion helper for momenta to two dimensional (absolute) bend radius.
static double	absMom2DToBendRadius (double absMom2D, const Vector2D &pos2D)
	Conversion helper for momenta to two dimensional (absolute) bend radius.
static double	absMom2DToBendRadius (double absMom2D, const Vector3D &pos3D)
	Conversion helper for momenta to two dimensional (absolute) bend radius.
static double	absMom2DToCurvature (double absMom2D, double charge, double bZ)
	Conversion helper for momenta to two dimensional curvature.
static double	absMom2DToCurvature (double absMom2D, double charge, const Vector2D &pos2D)
	Conversion helper for momenta to two dimensional curvature.
static double	absMom2DToCurvature (double absMom2D, double charge, const Vector3D &pos3D)
	Conversion helper for momenta to two dimensional curvature.
static double	curvatureToAbsMom2D (double curvature, double bZ)
	Conversion helper for two dimensional curvature to momenta.
static double	curvatureToAbsMom2D (double curvature, const Vector2D &pos2D)
	Conversion helper for two dimensional curvature to momenta.
static double	curvatureToAbsMom2D (double curvature, const Vector3D &pos3D)
	Conversion helper for two dimensional curvature to momenta.

Detailed Description

Helper functions to interact with the magnetic field.

Definition at line 23 of file CDCBFieldUtil.h.

Member Function Documentation

ccwInfoToChargeSign()

ESign ccwInfoToChargeSign ( ERotation  ccwInfo )

static

Conversion helper from clockwise or counterclockwise travel to the charge sign.

Return the charge sign based on the travel direction on the fitted circle. With the Lorentz force F = q * v x B. For positively charged particles we have:

• Counterclockwise travel <-> Bz < 0
• Clockwise travel <-> Bz > 0 and opposite for negatively charged. Hence the charge sign is -ERotation * sign(Bz)

Definition at line 74 of file CDCBFieldUtil.cc.

{
  return static_cast<ESign>(- ccwInfo * getBFieldZSign());
}

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The documentation for this class was generated from the following files:

• tracking/trackFindingCDC/eventdata/trajectories/include/CDCBFieldUtil.h
• tracking/trackFindingCDC/eventdata/trajectories/src/CDCBFieldUtil.cc