Development of an apparatus for measuring transverse phase-space acceptance

縦方向位相空間アクセプタンスを計測するための装置開発

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

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

An apparatus for transverse acceptance measurement has been developed in JAEA cyclotron facility. The apparatus consists of a phase-space collimator in the injection beam line and a beam current monitor after the cyclotron. The collimator consists of two pairs of position-defining slits and angle-defining slits to inject an arbitrarily small portion of transverse phase-space into the cyclotron. Measurement of the acceptance is made by injecting every portion in the whole phase-space which should be large enough to cover the acceptance. The acceptance can be estimated from the sum of the portions of the beam which pass through the system. The beam is measured by an uncooled Faraday cup or a scintillator because of the low beam current from a few picoampere to a few hundred picoampere in HEBT for acceptance measurement.