Plasma and Fusion Research

Volume 13, 2406012 (2018)

Regular Articles

Beam Extraction by the Laser Charge Exchange Method Using the 3-MeV LINAC in J-PARC
Hayanori TAKEI, Koichiro HIRANO, Kazuyoshi TSUTSUMI1) and Shin-ichiro MEIGO
J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Nippon Advanced Technology Co., Ltd., Tokai, Ibaraki 319-1112, Japan
(Received 12 June 2017 / Accepted 14 January 2018 / Published 28 March 2018)


The Accelerator-driven System (ADS) is one of the candidates for transmuting long-lived nuclides, such as minor actinide (MA), produced by nuclear reactors. For the efficient transmutation of MA, a precise prediction of the neutronics of the ADS is required. To obtain neutronics data for the ADS, 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 positive proton (H+) beam will be delivered from the J-PARC linac. Because the TEF-P requires a stable and low background proton beam with a power of less than 10 W, a stable and meticulous beam extraction method is required to extract the low power proton beam from the high power negative hydrogen (H) beam of 250 kW. To fulfill this requirement, a new type of Laser Charge Exchange (LCE) device was developed. A feature of this LCE device is the elimination of the background protons that are not extracted by the LCE technique. To demonstrate the charge exchange of H, an LCE experiment was conducted using a linac with an energy of 3 MeV in J-PARC. As a result of the experiment, a charge-exchanged H+ beam with a power of 7.99 ± 0.22 W equivalent was obtained under the J-PARC linac beam condition, and this value nearly satisfied the power requirement of the proton beam for the TEF-P.


laser charge exchange method, Accelerator-Driven System (ADS), Japan Proton Accelerator Research Complex (J-PARC), Transmutation Experimental Facility (TEF), beam extraction, 3-MeV linac

DOI: 10.1585/pfr.13.2406012


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