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Long beam pulse extraction by the laser charge exchange method using the 3-MeV linac in J-PARC

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

Japan Proton Accelerator Research Complex (J-PARC) has a plan to build the Transmutation Physics Experimental Facility (TEF-P), in which a 400-MeV proton beam will be delivered from negative hydrogen (H$$^{-}$$) accelerated by the linac. Since the TEF-P requires a stable proton beam with a power of less than 10 W, a steady and meticulous beam extraction method is required to extract a small amount of the proton beam from the high power beam using 250 kW. To fulfill this requirement, we have developed beam extraction based on the Laser Charge Exchange (LCE) method. For the demonstration present beam extraction technique, an experiment was conducted using H$$^{-}$$ beam accelerated by the 3-MeV linac at RFQ test-stand in J-PARC. As a result of the experiment with continuous wave (CW) of the Laser, a charge-exchanged long-pulsed H$$^{+}$$ beam with a power of about 0.70 W equivalent was successfully obtained under the TEF-P beam condition.

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