An ultra-high resolution pulsed-wire magnet measurement system
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The performance of a Free-Electron Laser (FEL) depends in part on the quality of the magnetic field in the undulator. Ideally the magnetic field on the axis of the undulator is transverse to the axis and sinusoidally varying due to the periodic sequence of alternating field dipole magnets. The resulting ideal trajectory of a relativistic electron bunch traveling along the axis is also sinusoidal in the plane perpendicular to that of the ideal magnetic field. Imperfections in the magnetic field lead to an imperfect electron trajectory, both offset and angle, as well as a relative phase error ...