Abstract
The Hughes Free Electron Laser Program is based upon a previous low voltage oscillator experiment in which a 225-kV electron beam was used to generate 60 kW of 30-GHz radiation in a test model FEL [1]. FEL kinetics, beam propagation and the 4.6% gain require a pulsewidth greater than 2 μs with a pulse flatness greater than 1% for oscillation in the test model FEL to occur. Propagation of the beam through the wiggler is a significant problem. A special “square” wiggler was designed to accomodate beam confinement in both the x and the y direction. The low gain of the system required that a high Q cavity must also be present for oscillation to occur. To this end a distributed-Bragg-reflector resonator was installed, which had a Q greater than 10 000. The results of these tests and previous experiments have led to the design of a second generation low voltage FEL which will be driven at 400 kV and operate between 60 and 100 Ghz. This FEL will be designed to facilitate operation with a second stage 6-MeV electron beam at UCSB to generate 7-μm radiation from a two-stage, two-beam FEL.
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