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Ishikawa, Masao; Nishitani, Takeo; Kusama, Yoshinori; Sukegawa, Atsuhiko; Takechi, Manabu; Shinohara, Koji; Krasilnikov, V. A.*; Kaschuck, Y.*; Sasao, Mamiko*; Isobe, Mitsutaka*; et al.
Plasma and Fusion Research (Internet), 2, p.019_1 - 019_11, 2007/05
no abstracts in English
Kawashima, Hisato; Shimizu, Katsuhiro; Takizuka, Tomonori; Sakurai, Shinji; Nakano, Tomohide; Asakura, Nobuyuki; Ozeki, Takahisa
Plasma and Fusion Research (Internet), 1(6), p.031_1 - 031_13, 2006/06
no abstracts in English
Sato, Satoshi; Verzirov, Y. M.; Ochiai, Kentaro; Nishitani, Takeo
Purazuma, Kaku Yugo Gakkai-Shi, 82(5), p.306 - 315, 2006/05
no abstracts in English
Seki, Takayoshi; Hanada, Masaya; Tobari, Hiroyuki; Inoue, Takashi; Takado, Naoyuki*; Mizuno, Takatoshi*; Hatayama, Akiyoshi*; Kashiwagi, Mieko; Taniguchi, Masaki; Watanabe, Kazuhiro; et al.
no journal, ,
no abstracts in English
Suzuki, Yutaka; Sakurai, Shinji; Shibama, Yusuke; Matsukawa, Makoto; Tamai, Hiroshi; Oda, Yasushi*; Shimizu, Katsusuke*
no journal, ,
no abstracts in English
Sueoka, Michiharu; Kawamata, Yoichi; Kurihara, Kenichi
no journal, ,
no abstracts in English
Tobita, Kenji
no journal, ,
no abstracts in English
Sugimoto, Makoto; Kitamura, Kazunori; Hamada, Kazuya; Nakajima, Hideo; Okuno, Kiyoshi
no journal, ,
no abstracts in English
Tsuchiya, Katsuhiko; Kizu, Kaname; Ando, Toshinari*; Takahashi, Hiroyuki*; Matsukawa, Makoto; Tamai, Hiroshi; Miura, Yukitoshi
no journal, ,
no abstracts in English
Parchamy, H.*; Peterson, B. J.*; Konoshima, Shigeru; Ashikawa, Naoko*
no journal, ,
Foil bolometers are standard magnetic fusion plasma diagnostics, by which the energy lost from the plasma can be detected through the heating of a thin metal foil. Imaging bolometers have been used in experiments to make time traces of radiation, in neutral beam injection heated discharges. In our case, the radiation is observed by a semi-tangentially viewing IR imaging bolometer in the JT-60U Tokamak, where a graphite-coated gold foil with a thickness of 2.5microns and an effective area of 9cm
7cm is used. The frame rate of this IR camera is 30Hz. Future calibration of the infrared imaging video bolometer will compensates for nonuniformities in the foil. We also improve the diagnostic by enabling the acquisition of 14bit digital data (compared with 8bit video data in the last campaign) and additional shielding for the IR camera against the magnetic field, neutrons and 
particles. The maximum brightness of the radiation from the plasma core during a disruption has been visible. The distribution of the radiation intensity in two dimensions (2D) could be inferred from the IR camera. These measurements yield a wealth of information on radiation behavior. The figure shows the intensity distribution of the black body radiation from the foil heated by the plasma radiation. Waveforms of the radiated power signal, shown in the bottom box, are processed with 0.1 second low pass filter for comparison with the imaging bolometer. This work was partly supported by Grants-in-Aid for Scientific Research of the JSPS, Nos.16560729/16082207.
Al strand and cable-in-conduit conductorKizu, Kaname; Ando, Toshinari*; Okuno, Kiyoshi; Koizumi, Norikiyo; Shimada, Katsuhiro; Seo, Kazutaka*; Takahata, Kazuya*; Tamai, Hiroshi; Tsuchiya, Katsuhiko; Nishimura, Arata*; et al.
no journal, ,
no abstracts in English
Sato, Kazuyoshi; Neyatani, Yuzuru; Maruo, Takeshi; Mukai, Satoru*; Uchida, Shoji*; Soman, Yoshindo*
no journal, ,
no abstracts in English
Totsuka, Toshiyuki; Sakata, Shinya; Iba, Katsuyuki*
no journal, ,
no abstracts in English
Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Naito, Osamu
no journal, ,
no abstracts in English
Tobari, Hiroyuki; Seki, Takayoshi; Hanada, Masaya; Inoue, Takashi; Kashiwagi, Mieko; Taniguchi, Masaki; Dairaku, Masayuki; Watanabe, Kazuhiro; Sakamoto, Keishi
no journal, ,
no abstracts in English
Tamai, Hiroshi; National Centralized Tokamak Design Team
no journal, ,
The mission of the National Centralized Tokamak(NCT) is to demonstrate a steady-state high-beta plasma control required for the economically and environmentally attractive DEMO, which aims at early realisation of a fusion reactor. NCT is also expected as a satellite tokamak besides ITER to perform the support research on the operation scenario optimisation and a study for physics issues. In this talk, a control scenario for a high-beta non-inductive current drive with a high bootstrap fraction in a low normalised collisionality and Larmor radius region will be presented. Recent engineering design of the main component such as the superconducting coils, vacuum chamber, and plasma-facing materials optimised for the realisation of high performance plasma characteristics is also presented.
Shinohara, Koji
no journal, ,
no abstracts in English
Inoue, Takashi; Kashiwagi, Mieko; Taniguchi, Masaki; Dairaku, Masayuki; Hanada, Masaya; Watanabe, Kazuhiro; Sakamoto, Keishi
no journal, ,
A beamlet divergence angle of as low as 5 mrad was achieved at the ITER relevant beam enrgies (
800 keV) and current densities (100 A/m
). The perveance to obtain such high power beams were similar to that of ITER operation (1 MeV, 200 A/m). Thus, the result suggests validity of beam optics design of the ITER accelerator.
Inoue, Takashi
no journal, ,
A fusion DEMO reactor requires NBI of high energy ( 1 MeV) for high power plasma heating and current drive. The NBI system for DEMO must fulfill other requirements such as (1) cw operation for 1 year, (2) low maintenance frequency (
once per year), (3) operability under radiation, (4) high system efficiency ( 50%). The present talk discusses DEMO NBI as a reasonable extrapolation of results from R&D and engineering design of the ITER NBI. For (1) and (2) above, R&D of filamentless source such as RF driven negative ion sources is in progress. The ITER R&D suggests possible extrapolation of exsisting electrostatic accelerator technologies up to 1.5 MeV. Additional radiation shielding is to be installed around the beam path, of which cross sectional area is reduced by merging multibeamlets into several beam groups. A concept of laser neutralizer, that utilizes semmiconductor lasers, is presented and discussed to achieve higher system efficiency close to 90%.
-ray by 
He(d,)reaction and its application for burning plasma diagnosticsKubota, Naoyoshi; Ochiai, Kentaro; Taniike, Akira*; Kitamura, Akira*
no journal, ,
no abstracts in English
