Class Helix

java.lang.Object

org.jlab.clas.tracking.trackrep.Helix

public class Helix
extends Object

Author:

ziegler

Field Summary

Fields

Modifier and Type	Field	Description
static final double	LIGHTVEL

Constructor Summary

Constructors

Constructor	Description
Helix()
Helix(double x0, double y0, double z0, double px0, double py0, double pz0, int q, double B, double xb, double yb, Units unit)
Helix(double d0, double phi0, double omega, double z0, double tanL, int turningSign, double B, double xb, double yb, Units unit)

Method Summary

Modifier and Type	Method	Description
double	getB()
double	getCosphi0()
double	getD0()
org.jlab.geom.prim.Point3D	getHelixPointAtPlane(double X1, double Y1, double X2, double Y2, double tolerance)
org.jlab.geom.prim.Point3D	getHelixPointAtR(double r)
org.jlab.geom.prim.Point3D	getHelixPointAtZ(double z)
double	getLAtPlane(double X1, double Y1, double X2, double Y2, double tolerance)
double	getLAtR(double r)
double	getLAtZ(double z)
final double	getLightVelocity()
org.jlab.geom.prim.Vector3D	getMomentumAtPlane(double X1, double Y1, double X2, double Y2, double tolerance)
org.jlab.geom.prim.Vector3D	getMomentumAtR(double r)
org.jlab.geom.prim.Vector3D	getMomentumAtZ(double z)
double	getOmega()
double	getPathLength(double rMin, double rMax)	Computes the path length between to points at radius rMin and rMax of the helix.
double	getPhi(double l)
double	getPhi0()
double	getPt(double B)
double	getPx()
double	getPx(double B, double l)
double	getPy()
double	getPy(double B, double l)
double	getPz()
double	getPz(double B)
double	getR()
double	getSinphi0()
double	getTanL()
int	getTurningSign()
Units	getUnits()
double	getX()
double	getX(double l)
double	getXb()
double	getXc()
double	getY()
double	getY(double l)
double	getYb()
double	getYc()
double	getZ()
double	getZ(double l)
double	getZ0()
void	reset(double d0, double phi0, double omega, double z0, double tanL, double B)
void	setR(double _R)
String	toString()
final void	update()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

LIGHTVEL

public static final double LIGHTVEL

See Also:

• Constant Field Values

Constructor Details

Helix

public Helix()

Helix

public Helix(double d0,
 double phi0,
 double omega,
 double z0,
 double tanL,
 int turningSign,
 double B,
 double xb,
 double yb,
 Units unit)

Helix

public Helix(double x0,
 double y0,
 double z0,
 double px0,
 double py0,
 double pz0,
 int q,
 double B,
 double xb,
 double yb,
 Units unit)

Method Details

getUnits

public Units getUnits()

getLightVelocity

public final double getLightVelocity()

reset

public void reset(double d0,
 double phi0,
 double omega,
 double z0,
 double tanL,
 double B)

update

public final void update()

getB

public double getB()

getD0

public double getD0()

getPhi0

public double getPhi0()

getCosphi0

public double getCosphi0()

getSinphi0

public double getSinphi0()

getOmega

public double getOmega()

getZ0

public double getZ0()

getTanL

public double getTanL()

getTurningSign

public int getTurningSign()

getR

public double getR()

setR

public void setR(double _R)

getXc

public double getXc()

getYc

public double getYc()

getXb

public double getXb()

getYb

public double getYb()

getPhi

public double getPhi(double l)

getPt

public double getPt(double B)

getX

public double getX(double l)

getY

public double getY(double l)

getZ

public double getZ(double l)

getPx

public double getPx(double B,
 double l)

getPy

public double getPy(double B,
 double l)

getPz

public double getPz(double B)

getX

public double getX()

getY

public double getY()

getZ

public double getZ()

getPx

public double getPx()

getPy

public double getPy()

getPz

public double getPz()

getLAtPlane

public double getLAtPlane(double X1,
 double Y1,
 double X2,
 double Y2,
 double tolerance)

getHelixPointAtPlane

public org.jlab.geom.prim.Point3D getHelixPointAtPlane(double X1,
 double Y1,
 double X2,
 double Y2,
 double tolerance)

getMomentumAtPlane

public org.jlab.geom.prim.Vector3D getMomentumAtPlane(double X1,
 double Y1,
 double X2,
 double Y2,
 double tolerance)

getLAtR

public double getLAtR(double r)

getHelixPointAtR

public org.jlab.geom.prim.Point3D getHelixPointAtR(double r)

getMomentumAtR

public org.jlab.geom.prim.Vector3D getMomentumAtR(double r)

getLAtZ

public double getLAtZ(double z)

getHelixPointAtZ

public org.jlab.geom.prim.Point3D getHelixPointAtZ(double z)

getMomentumAtZ

public org.jlab.geom.prim.Vector3D getMomentumAtZ(double z)

getPathLength

public double getPathLength(double rMin,
 double rMax)

Computes the path length between to points at radius rMin and rMax of the helix.

Parameters:

rMin - the radius of the point from which to measure.

rMax - the radius of the point to which to measure. helix parametrization is X(l) = xc - s*R*sin(phi0+omega*l) Y(l) = yc + s*R*cos(phi0+omega*l) Z(l) = z0 - l*tanL d^2 = (dX/dl)^2 + (dY/dl)^2 + (dZ/dl)^2 pathlength = integral of d(l) from l(rMin) to l(rMax) pathlength = sqrt(R^2omega^2+tanL^2)*(l(rMax)-l(rMin))

toString

public String toString()

Overrides:

toString in class Object