Abstract
The JAERI FEL linac is energized with four kinds of all-solid-state amplifiers having 5, 1.5, 4, and 50 kW of peak power with a 1–2 ms pulse length. Amplitude and phase stabilities of the 50 kW amplifiers are ∼ 1% and ∼1°, respectively. A feed-forward loop circuit is effective when a feedback loop circuit is not able to stabilize the output of rf power.
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