定在波測定を用いる電子ビーム微細構造パルス幅の計測

概要

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This paper describes a new method to estimate the width of electron beam micro-pulses on an electron linear accelerator. It is based on the measurement of standing wave distributions. The standing waves are formed by interference between two waves. One is the traveling wave that is radiated directly from the micro-pulses of the electron beam. Another is its reflected wave that is reflected at a conducting plate, and propagates in the opposite direction. In this paper, standing wave distributions are calculated by using a one-dimensional model of the excited electromagnetic fields. The calculated results indicate that standing wave distributions have dips at equal spaces and the width of each dip is proportional to the micro-pulse width. When standing wave distributions have fluctuations in magnitude, it is found that the dip widths are linearly dependent on standing wave ratios, and the micro-pulse width can be estimated from the dip width when the ratio is unity. To show the validity of this method, we obtained standing electromagnetic wave distributions by an experiment at Hokkaido University. The estimated values based on this method show good agreement with the expected width of the electron beam micro-pulse.
社団法人プラズマ・核融合学会の論文
1998-01-25