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J-PARC核変換実験施設計画の現状,4; レーザーを用いた小出力ビームの取り出し

Status of J-PARC Transmutation Experimental Facility Program, 4; Low-power beam extraction by laser

武井 早憲 ; 平野 耕一郎; 堤 和昌; 明午 伸一郎  

Takei, Hayanori; Hirano, Koichiro; Tsutsumi, Kazuyoshi; Meigo, Shinichiro

J-PARCで整備を目指している核変換物理実験施設(TEF-P)では、リニアックからの大強度負水素イオンビーム(エネルギー400MeV、出力250kW)から小出力の陽子ビーム(最大出力10W)を安定に取り出す必要がある。原子力機構では、レーザーを用いた荷電変換によるビーム取り出し法を提案し、開発を行っている。今回、3MeVの負水素イオンが加速できるリニアックにおいてレーザー荷電変換試験を実施したところ、約8W相当の安定したビームを長時間取り出すことに成功した。

The Japan Proton Accelerator Research Complex (J-PARC) has a plan to build the Transmutation Physics Experimental Facility (TEF-P), in which a 400-MeV negative proton (H$$^{-}$$) beam will be delivered from the J-PARC linac. Since the TEF-P requires a stable proton beam with a power of less than 10W, a stable and meticulous beam extraction method is required to extract a small amount of the proton beam from the high power beam using 250kW. To fulfil this requirement, the Laser Charge Exchange (LCE) method has been developed. To demonstrate the charge exchange of the H$$^{-}$$, a preliminary LCE experiment was conducted using a linac with energy of 3MeV in J-PARC. As a result of the experiment, a charge-exchanged H$$^{+}$$ beam with a power of about 8W equivalent was obtained under the J-PARC linac beam condition.

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