Abstract
The inverse Smith-Purcell (ISP) effect is a candidate for laser-driven linacs with an accelerating gradient of several GeV/m. It uses a metallic grating as an interaction circuit. For the first time, we observed the ISP effect using a submillimeter wave (SMM) laser as the driving source in 1987. Since then, we have improved the signal-to-noise ratio in the electron energy measurements to verify the theoretical predictions in more detail. In this paper, we describe our experimental apparatus and newly obtained experimental results of this effect. These agreed with the theory.
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