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糟谷 紘一*; 小沢 翔*; 鈴木 哲; 江里 幸一郎; 秋場 真人
Proceedings of 22nd IEEE/NPSS Symposium on Fusion Engineering (SOFE 2007) (CD-ROM), 4 Pages, 2007/06
ITERのプラズマ対向壁に関する重要な課題にELM(周辺局在化モード)に対するダイバータ表面材料の損耗が挙げられる。本研究では、原子力機構の高熱負荷試験装置(JEBIS)においてITERのプラズマ対向壁候補材料にELMを模擬した熱負荷を与え、その損耗挙動を調べた。その結果、炭素繊維複合材(CFC材)では電子ビームの照射回数の増加に伴い、損耗量の増加が認められた。一方、タングステンでは照射回数と損耗量の相関は、CFC材に比べ小さいことがわかった。
Peterson, B. J.*; 木島 滋; Kostryukov, A. Y.*; 川島 寿人; Seo, D. C.*; Miroshnikov, I. V.*; 芦川 直子*; Parchamy, H.*; Liu, Y.*; JT-60実験チーム
no journal, ,
Infrared Imaging Video Bolometers (IRVB) provide a reactor relevant alternative to conventional resistive bolometers due to the radiation durability of the used materials, the lack of wire feedthroughs and in vessel cabling and the lack of signal drift during steady state operation. An IRVB prototype has been successfully installed and operated on the JT-60U tokamak demonstrating its applicability to a reactor environment. In this paper we present the design of an upgraded version of this IRVB. The 2.5 micron gold foil will be replaced with a 5 micron tantalum foil for improved rigidity. Enlarged vacuum window and additional IR periscope with large IR lenses and mirrors will improve the optical throughput. An improvement in the sensitivity of the IRVB by at least a factor of 50 is expected.
Parchamy, H.*; Peterson, B. J.*; 林 浩己*; 木島 滋; 芦川 直子*; Seo, D. C.*; 川島 寿人; JT-60チーム
no journal, ,
The calibration technique of the imaging bolometer foil gives confidence in the measured values of the plasma radiation power. In this work, we improve the accuracy of the calibration by using a new IR camera (60 Hz, 320 
240 pixels, 7.5-13 microns) in a calibration laboratory (low noise environment) with a close-up lens which provides a spatial resolution of 0.09 mm which is nearly 7 times better than the previous in situ calibration using a different IR camera. Tantalum, Ta, is offered for improved sensitivity, foil strength, and lower neutron cross-section compared to the previously used gold foil. In this paper we report, the local foil properties (the thermal diffusivity, the thermal conductivity, and the thickness) of a single graphite-coated gold foil (a nominal thickness of 2.5 microns) compared with those of a single graphite-coated tantalum foil (a nominal thickness of 5 microns) for an imaging bolometer through calibration with a He-Ne laser.