Class SwimZDerivative

java.lang.Object

cnuphys.swimZ.SwimZDerivative

All Implemented Interfaces:

IDerivative

Direct Known Subclasses:

SectorSwimZDerivative

public class SwimZDerivative
extends Object
implements IDerivative

Field Summary

Fields

Modifier and Type	Field	Description
protected FieldProbe	_probe
protected double	_q
protected double	_qv
protected float[]	B

Constructor Summary

Constructors

Constructor	Description
SwimZDerivative()
SwimZDerivative(int Q, double p, FieldProbe probe)	The derivative for swimming through a magnetic field

Method Summary

Modifier and Type	Method	Description
void	derivative(double z, double[] x, double[] dxdz)	Compute the derivatives given the value of the independent variable and the values of the function.
void	set(int Q, double p, FieldProbe probe)	Set the parameters

Methods inherited from class java.lang.Object

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

Field Details

_probe

protected FieldProbe _probe

_q

protected double _q

_qv

protected double _qv

B

protected float[] B

Constructor Details

SwimZDerivative

public SwimZDerivative()

SwimZDerivative

public SwimZDerivative(int Q,
 double p,
 FieldProbe probe)

The derivative for swimming through a magnetic field

Parameters:

Q - -1 for electron, +1 for proton, etc.

p - the magnitude of the momentum in GeV/c.

probe - the magnetic field getter

Method Details

set

public void set(int Q,
 double p,
 FieldProbe probe)

Set the parameters

Parameters:

Q - -1 for electron, +1 for proton, etc.

p - the magnitude of the momentum in GeV/c.

probe - the magnetic field getter

derivative

public void derivative(double z,
 double[] x,
 double[] dxdz)

Compute the derivatives given the value of the independent variable and the values of the function. Think of the Differential Equation as being dydt = f[y,t].

Specified by:

derivative in interface IDerivative

Parameters:

z - the value of the independent variable (the z coordinate) (input).

x - the values of the state vector (x, y, tx, ty, q) at z (input).

dxdz - will be filled with the values of the derivatives at z (output).