PROBLEM TO BE SOLVED: To extract a plurality of beams different in energy in a short time in an accelerator.SOLUTION: A control device of the accelerator is equipped with a magnetic field reference generating portion and an electric current reference converting portion. The magnetic field reference generating portion stores an initial elevation pattern in which magnetic flux density increases from an initial value to an initial acceleration completion level, a reduction pattern in which the magnetic flux density decreases by a prescribed width of reduction, and an ending pattern in which the magnetic flux density decreases to the ending value, and according to time lapse, outputs magnetic flux information corresponding to the initial elevation pattern in the case of receiving an initial elevation instruction, the magnetic flux information corresponding to the reduction pattern in the case of a reduction instruction after outputting the magnetic flux information corresponding to the initial elevation pattern, and the magnetic flux information corresponding to the ending pattern in the case of receiving an ending instruction. The electric current reference converting portion obtains a coil current value to generate a magnetic field corresponding to the renewed magnetic flux information, and inputs it into a power supply portion of a magnetic field coil of the accelerator.COPYRIGHT: (C)2011,JPO&INPIT【課題】加速器において、エネルギーの異なる複数のビームを短時間で取り出す。【解決手段】本発明の加速器の制御装置は、磁場基準発生部と電流基準変換部とを備える。磁場基準発生部は、磁束密度が初期値から初期加速完了レベルまで増加する初期上げパターンと、所定の減少幅で磁束密度が減少する減少パターンと、磁束密度が終了値まで減少する終了パターンとを記憶しており、初期上げ指令を受けた場合には初期上げパターンに従った磁束密度情報を、初期上げパターンに従った磁束密度情報の出力後に減少指令を受けた場合には減少パターンに従った磁束密度情報を、終了指令を受けた場合には終了パターンに従った磁束密度情報を、経過時間に応じて出力する。電流基準変換部は、更新された磁束密度情報に応じた磁場を発生させるコイル電流値を求めて、これを加速器の磁場コイルの電源供給部に入力する。【選択図】 図1
