Package cnuphys.swim

Class SectorDerivative

java.lang.Object

cnuphys.swim.SectorDerivative

All Implemented Interfaces:

IDerivative

public class SectorDerivative
extends Object
implements IDerivative

Used for swimming in the sector system with a rotated composite field

Author:

heddle

Constructor Summary

Constructors

Constructor	Description
SectorDerivative(int sector, int charge, double momentum, cnuphys.magfield.RotatedCompositeProbe rcProbe)	The derivative for swimming through a magnetic field

Method Summary

Modifier and Type	Method	Description
void	derivative(double s, double[] Q, double[] dQds)	Compute the derivatives given the value of s (path length) and the values of the state vector.
void	set(int sector, int charge, double momentum, cnuphys.magfield.RotatedCompositeProbe rcProbe)

Methods inherited from class java.lang.Object

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

Constructor Details

SectorDerivative

public SectorDerivative(int sector,
 int charge,
 double momentum,
 cnuphys.magfield.RotatedCompositeProbe rcProbe)

The derivative for swimming through a magnetic field

Parameters:

sector - the sector [1..6]

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

momentum - the magnitude of the momentum.

field - the magnetic field

Method Details

set

public void set(int sector,
 int charge,
 double momentum,
 cnuphys.magfield.RotatedCompositeProbe rcProbe)

derivative

public void derivative(double s,
 double[] Q,
 double[] dQds)

Compute the derivatives given the value of s (path length) and the values of the state vector.

Specified by:

derivative in interface IDerivative

Parameters:

s - the value of the independent variable path length (input).

Q - the values of the state vector ([x,y,z, px/p, py/p, pz/p]) at s (input).

dydt - will be filled with the values of the derivatives at t (output).