TY - JOUR
T1 - Development of high-power-density ion beam system with high-repetition pulse operation
AU - Sakakita, Hajime
AU - Kiyama, Satoru
AU - Koguchi, Haruhisa
AU - Hirano, Yoichi
AU - Shimada, Toshio
AU - Tokitani, Masayuki
AU - Yoshida, Naoaki
AU - Tokunaga, Kazutoshi
N1 - Funding Information:
This study was financially supported by the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan, based on the screening and counseling of the Atomic Energy Commission
Publisher Copyright:
© 2010 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2010
Y1 - 2010
N2 - A high-power-density ion beam system with high-repetition pulses was successfully developed. In the ITER (International Thermonuclear Experimental Reactor), it is anticipated that an intermittent thermal flux, due to the edge localized mode (ELM), to the plasma facing materials causes severe damage of the mechanical properties. Therefore, it is very important to study the effect of ELM phenomena. We already developed an ion beam system with a power density as high as ~1GW/m2 around the focal point of the beam. In order to imitate the intermittent high-power-density pulsed flux, we modified the beam operation method and part of the acceleration power supply. A pulsed helium ion beam with the beam width of 2 ms and 4 ms intervals between pulses was successfully extracted. In this case, beam energy, current and power were ~22 keV, ~40A, and ~0.88MW, respectively. This high-repetition pulsed helium ion beam with high power density (~300MW/m2) was irradiated to a tungsten material. It was found that this repetitive short-pulse irradiation caused less surface damage compared with long-pulse irradiation, even when the total amount of irradiation fluence (1.5× 1022 particles/m2) was the same for each condition. This would provide important data for the design of ITER diverter.
AB - A high-power-density ion beam system with high-repetition pulses was successfully developed. In the ITER (International Thermonuclear Experimental Reactor), it is anticipated that an intermittent thermal flux, due to the edge localized mode (ELM), to the plasma facing materials causes severe damage of the mechanical properties. Therefore, it is very important to study the effect of ELM phenomena. We already developed an ion beam system with a power density as high as ~1GW/m2 around the focal point of the beam. In order to imitate the intermittent high-power-density pulsed flux, we modified the beam operation method and part of the acceleration power supply. A pulsed helium ion beam with the beam width of 2 ms and 4 ms intervals between pulses was successfully extracted. In this case, beam energy, current and power were ~22 keV, ~40A, and ~0.88MW, respectively. This high-repetition pulsed helium ion beam with high power density (~300MW/m2) was irradiated to a tungsten material. It was found that this repetitive short-pulse irradiation caused less surface damage compared with long-pulse irradiation, even when the total amount of irradiation fluence (1.5× 1022 particles/m2) was the same for each condition. This would provide important data for the design of ITER diverter.
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U2 - 10.1585/pfr.5.S2105
DO - 10.1585/pfr.5.S2105
M3 - Article
AN - SCOPUS:84881058847
SN - 1880-6821
VL - 5
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
M1 - S2105
ER -