Excitation cancelling free electron laser

Details Excitation cancelling free electron laser Excitation cancelling free electron laser

1981-06-30

1984-10-23

Sikes, William L.

Coherent light generators

Free electron laser

H01S 300

Patent

active

044792190

ABSTRACT:
A gain-expanded free electron laser in which a relativistic electron beam exchanges energy with an electromagnetic wave in an interaction region defined by a magnet system is configured to suppress betatron excitation. The magnet system, the electromagnetic wave, and electron beam are characterized by a net optical phase slip qL during the interaction between the phase of the electromagnetic wave and the phase of the electron transverse velocity, and a net betatron phase advance .LAMBDA.L. The optical phase slip and the betatron phase advance are chosen to satisfy the following constraints

REFERENCES:
patent: 3822410 (1974-07-01), Madey
"Reducing the Sensitivity of a Free-Electron Laser to Electron Energy", Smith et al., J. Appl. Phys., vol. 50, No. 7, 1979.
John M. J. Madey, Robert C. Taber, "Equations of Motion . . . with a Transverse Gradient", Physics of Quantum Electronics, vol. 7, 8/1980.
John M. J. Madey, "Cancellation of Transverse Excitation in Gain Expanded Free Electron Lasers", HEPL Report 850, 5/1979.
John M. J. Madey, Robert C. Taber, "Gain and Saturation in Excitation Cancelling . . . Lasers", HEPL Report 855, 9/1979.

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