Analysis of phase bunching in AVF cyclotron

AVFサイクロトロンの位相バンチングの解析

宮脇 信正; 倉島 俊; 柏木 啓次; 奥村 進; 吉田 健一; 百合 庸介; 湯山 貴裕; 石坂 知久; 石堀 郁夫; 奈良 孝幸

Miyawaki, Nobumasa; Kurashima, Satoshi; Kashiwagi, Hirotsugu; Okumura, Susumu; Yoshida, Kenichi; Yuri, Yosuke; Yuyama, Takahiro; Ishizaka, Tomohisa; Ishibori, Ikuo; Nara, Takayuki

A phase bunching effect in the central region of the JAEA AVF cyclotron has been investigated to obtain a narrow beam phase width necessary for extraction of a low energy spread beam. Simulation of a beam trajectory in the central region indicated that phase bunching was generated for the acceleration harmonic number () 2 and 3. The beam phase distribution of a 260 MeV Ne ( = 2) beam in the cyclotron was measured in order to experimentally confirm the phase bunching effect. As a result, reduction of the phase distributions from 18.9 to 4 RF degrees was observed as consistent with the calculation results.