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/*
* Quadrupole.h
*
* Created on: Mar 29, 2011
* Author: jakob
*/
#ifndef QUADRUPOLE_H_
#define QUADRUPOLE_H_
#include <string>
#include "StraightElement.h"
#include "Vector3D.h"
#include "ElementVisitor.h"
namespace vhc {
class Quadrupole: public StraightElement {
private:
double focusingCoefficient;
public:
Quadrupole(const Vector3D& entry, const Vector3D& exit, double sectionRadius, double focusingCoefficient, Element* next = NULL):
StraightElement(entry, exit, sectionRadius, next),
focusingCoefficient(focusingCoefficient)
{};
virtual ~Quadrupole() {};
virtual Vector3D magneticFieldAt(const Vector3D& position) {
Vector3D x = position - getEntryPosition();
Vector3D d = getDiagonal().unit();
Vector3D y = x - x.dot(d) * d;
Vector3D u = Vector3D::k.cross(d);
return focusingCoefficient * (y.dot(u) * Vector3D::k + position.getZ() * u);
}
double getFocusingCoefficient() const {
return focusingCoefficient;
}
void setFocusingCoefficient(double value) {
focusingCoefficient = value;
}
virtual std::string getType() const {return "Quadrupole";}
virtual void accept(ElementVisitor& v) {v.visit(this);}
virtual Quadrupole* clone() const {return new Quadrupole(getEntryPosition(), getExitPosition(), getSectionRadius(), focusingCoefficient);}
};
}
#endif /* QUADRUPOLE_H_ */
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