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J-PARC RCSにおけるビーム電流モニタのビーム強度依存性

Intensity dependence of the beam current monitors at J-PARC RCS

林 直樹 

Hayashi, Naoki

ビーム強度,ビーム電流の測定は、加速器の中で、最も重要なビーム診断系の一つである。J-PARC Rapid-Cycling Synchrotron (RCS)では、二つのビーム強度モニタの他、帯域の異なる複数のCurrent Transformer (CT)を備えている。RCSは、定格で、1MWのビームパワーを出す大強度加速器であり、近年、ユーザーへの供給するビームパワーも上昇し、パルス当たり定格での運転も、短時間ながら行われてきた。また、パルス当たりで、1MW相当以上の試験運転も試みられている。初期設計の性能達成、そしてそれを超える運転を通じ、改めて、ビーム電流測定の強度依存性について現状を整理して報告する。

Measurement of beam intensity or beam current is the one of the most important beam diagnostic in an accelerator. At J-PARC Rapid-Cycling Synchrotron (RCS), there are two kinds of beam intensity monitors and multiple Current Transformers (CT) with various bandwidth. The RCS is a high intensity proton accelerator and its designed beam power of 1 MW. The beam power delivered to users gradually increases in the recent year. Single pulse or short term with designed beam power has been also demonstrated. In addition, beyond 1-MW equivalent intensity has been attempted. Through the experience with achievement of the design goal and the operation beyond it, intensity dependence of beam current measurement has been summarized.

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