Low-power proton beam extraction by the bright continuous laser using the 3-MeV negative-hydrogen linac in Japan Proton Accelerator Research Complex

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

Journal of Nuclear Science and Technology, 58(5), p.588 - 603, 2021/05

https://doi.org/10.1080/00223131.2020.1848654

The Japan Atomic Energy Agency (JAEA) has designed a Transmutation Physics Experimental Facility (TEF-P) as an experimental facility in the Japan Proton Accelerator Research Complex (J-PARC). The TEF-P is a critical assembly driven by a low-power proton beam, a maximum of 10 W, which is extracted from a high-power beam source, such as 250 kW of 400 MeV proton beam of the J-PARC Linac. To extract such a low-power proton beam from the high-power proton beam, we developed a laser charge exchange (LCE) device and employed its technique, which is one of the non-contact beam extraction techniques. For the proof of performance of the LCE device to the TEF-P, a low-power proton beam was extracted using a negative-hydrogen (H) Linac having an energy of 3 MeV, and a bright continuous laser. Proton beam with the power of 0.57 mW was successfully extracted with a laser stripping efficiency of . These experimental values are in good agreement with the estimated ones.

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*

JNC TJ7420 2000-007, 28 Pages, 2000/03

JNC-TJ7420-2000-007.pdf:11.92MB

no abstracts in English

The development of intense sources for positron beams; Study on an efficiency for production of positrons (1)

PNC TN9410 96-028, 46 Pages, 1996/01

PNC-TN9410-96-028.pdf:1.23MB

Positrons have special properties different from electrons, that is, depth controllability, surface sensitivity, unique ionization channels and elemental anti-particle properties. Because of these characteristics of positron, positron beams, especial1y slow positron beams, have been expected to be a powerful tool for observation of nature in widerange of research fields from materials science to basic physics, chemistry and biology, In this report, we describe the possibility and application to produce an intense beam of slow positrons by using high power CW electron linac which has been developed at PNC. Using some calculations, we find that the intensity of slow positron beam from PNC linac is 1 10 3 10 s. It is corresponding to 200 4000 times as many as usual.

Design of a CW high beam powerelectron linac

Wang, Y.

PNC TN9410 92-039, 26 Pages, 1992/02

PNC-TN9410-92-039.pdf:0.63MB

A test CW electron linac is designed to develop a high power accelerator to treat waste radioactive material. The linac is to be operated at the room temperature and is energized by two 1.2MW CW L-band klystrons to produce an electron beam with the energy of 10MeV and current of 100mA. The average beam power is 200KW-1MW for the duty factor 20%-100%. In designing such high power electron linear accelerator, an accelerating section having a traveling wave resonant ring is adopted. By adopting such type of acceleration section, it became possible to choose very short length of the accelerator sections to elevate the threshold current of beam break-up (BBU) keeping the high accelerator efficiency. In designing the linac with the traveling wave resonant ring, some special considerations and calculations are introduced. The variational method is used to calculate the sizes and parameters of the disk-loaded accelerator structure. There is the discrepancy of the order of a few hundredth of one percent between the calculated frequency and the experimental one. A kind of internal cooling water structure is adopted to disperse the generated heat by RF efficiently. Currently, its components development is in progress at OEC.