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JAEA Reports

Disassembly of the NBI system on JT-60U for JT-60 SA

Akino, Noboru; Endo, Yasuei; Hanada, Masaya; Kawai, Mikito*; Kazawa, Minoru; Kikuchi, Katsumi*; Kojima, Atsushi; Komata, Masao; Mogaki, Kazuhiko; Nemoto, Shuji; et al.

JAEA-Technology 2014-042, 73 Pages, 2015/02

JAEA-Technology-2014-042.pdf:15.1MB

According to the project plan of JT-60 Super Advanced that is implemented as an international project between Japan and Europe, the neutral beam (NB) injectors have been disassembled. The disassembly of the NB injectors started in November, 2009 and finished in January, 2012 without any serious problems as scheduled. This reports the disassembly activities of the NB injectors.

Journal Articles

Technological development and progress of plasma performance on the JT-60U

Yamamoto, Takumi; JT-60 Team

Fusion Engineering and Design, 66-68, p.39 - 48, 2003/09

 Times Cited Count:3 Percentile:26.72(Nuclear Science & Technology)

Development of technology on facilities for JT-60U and resultant progress of the plasma performance are reported. The main objectives of JT-60U are to demonstrate integrated high plasma performance that contributes to establishment of the physical and technological bases of ITER and a steady state tokamak fusion reactor. Recently, performance exploration in advanced tokamak regimes has been conducted intensively, by using 500 keV negative-ion based neutral beam injection (N-NBI) and 110GHz electron cyclotron (EC) systems for plasma heating and current drive, and a repetitive centrifugal pellet injector for efficient core particle fueling.

Journal Articles

Progress of negative ion source improvement in N-NBI for JT-60U

Kawai, Mikito; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hanada, Masaya; Honda, Atsushi; Inoue, Takashi; Kazawa, Minoru; Kikuchi, Katsumi*; Kuriyama, Masaaki; et al.

Fusion Science and Technology, 44(2), p.508 - 512, 2003/09

 Times Cited Count:4 Percentile:32.68(Nuclear Science & Technology)

The negative ion source for negative ion based neutral beam injector(N-NBI) of JT-60U aims at generating a negative ion beam with 500 keV and 22A for 10s. The N-NBI system was completed in 1996, followed by starting the efforts to increase beam power and energy. (1)Spatial non-uniformity of the source plasma causes position-dependent divergence of a beamlet due to mis-matching of local beam perveance. A part of the divergent energetic beams is intercepted by the grids and resultantly produce the excessive heat load of the grids and/or induce the high voltage breakdown. So several techniques to take measures against and to correct the non-uniformity in these sources were implemented. (2)Correction of beamlet deflection by adjusting the electric field at the extraction grids. It improved the beam divergence and then decreased an excessive heat load of a beam limiter by more than 50 %. As a result, the maximum injection power 6.2MW and beam pulse duration 10 seconds were obtaind.

Journal Articles

Heating and current drive by N-NBI in JT-60U and LHD

Kaneko, Osamu*; Yamamoto, Takumi; Akiba, Masato; Hanada, Masaya; Ikeda, Katsunori*; Inoue, Takashi; Nagaoka, Kenichi*; Oka, Yoshihide*; Osakabe, Masaki*; Takeiri, Yasuhiko*; et al.

Fusion Science and Technology, 44(2), p.503 - 507, 2003/09

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

High energy negative-ion-based neutral beam injection (N-NBI) is expected as an efficient and reliable tool of heating and current driving for reactor plasmas such as ITER. A world wide activity on developing technology of negative ion production and beam formation started in 1980's and the great progress has been achieved up to now. In particular, Japan has two large projects that planned adopting N-NBI for real plasma experiments; the JT-60U tokamak and the LHD heliotron, which further motivated the R&D activity. These R&D programs were carried out at JAERI and NIFS separately in Japan, and both were successfully done. The first beam injection experiment was made on the JT-60U in 1996, followed by the LHD in 1998. They were the first experiments on heating plasma by high energy beam in tokamaks and in stellerators, and the obtained results were very promising.

Journal Articles

Combined non-inductive current drive in a high confinement reversed magnetic shear plasma at high normalized density in JT-60U

Ide, Shunsuke; Fujita, Takaaki; Suzuki, Takahiro; Hatae, Takaki; Naito, Osamu; Kamada, Yutaka; Seki, Masami

Plasma Physics and Controlled Fusion, 44(11), p.L63 - L69, 2002/11

 Times Cited Count:25 Percentile:69.35(Physics, Fluids & Plasmas)

Non-inductive full current drive (CD) in a reversed magnetic shear plasma (RS) with high energy confinement of 1.4 times the H-mode scaling at 82% of the Greenwald density has been achieved simultaneously for the first time in a tokamak; these results were obtained in the JT-60U tokamak. The full-CD state was realized by a combination of waves in the lower hybrid range of frequency and neutral beam injection together with high bootstrap current fraction ($$f_{rm bs}$$) of 62% to the total plasma current. The combination has demonstrated for the first time active current profile modification in a high $$f_{rm bs}$$ RS plasma both in the core and in peripheral regions.

Journal Articles

Optimization of plasma grid material in cesium-seeded volume negative-ion sources

Kashiwagi, Mieko; Morishita, Takatoshi; Okumura, Yoshikazu; Taniguchi, Masaki; Hanada, Masaya; Watanabe, Kazuhiro; Krylov, A.*

Review of Scientific Instruments, 73(2), p.964 - 966, 2002/02

 Times Cited Count:10 Percentile:51.76(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Reactor relevant current drive and heating by N-NBI on JT-60U

Oikawa, Toshihiro; Kamada, Yutaka; Isayama, Akihiko; Fujita, Takaaki; Suzuki, Takahiro; Umeda, Naotaka; Kawai, Mikito; Kuriyama, Masaaki; Grisham, L. R.*; Ikeda, Yoshitaka; et al.

Nuclear Fusion, 41(11), p.1575 - 1583, 2001/11

 Times Cited Count:45 Percentile:78.39(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Development of plasma neutralizer using DC arc discharge

Kashiwagi, Mieko; Okumura, Yoshikazu; Hanada, Masaya; Morishita, Takatoshi; Watanabe, Kazuhiro; Orita, Yoshitaka*; Horiike, Hiroshi*; Ido, Shuji*

JAERI-Tech 2001-046, 19 Pages, 2001/06

JAERI-Tech-2001-046.pdf:1.79MB

no abstracts in English

Journal Articles

Formation of internal transport barriers and its impact on the JT-60U plasmas

Ide, Shunsuke; JT-60 Team

Journal of Plasma and Fusion Research SERIES, Vol.4, p.99 - 105, 2001/00

no abstracts in English

Journal Articles

Fast particle experiments in JT-60U

Kramer, G. J.; Iwase, Makoto; Kusama, Yoshinori; Morioka, Atsuhiko; Nemoto, Masahiro; Nishitani, Takeo; Shinohara, Koji; Takeji, Satoru; Tobita, Kenji; Ozeki, Takahisa; et al.

Nuclear Fusion, 40(7), p.1383 - 1396, 2000/07

 Times Cited Count:44 Percentile:78.44(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Study of plasma uniformity on JT-60 negative ion source

Kawai, Mikito; Grisham, L. R.*; Ito, Takao; Kazawa, Minoru; Kuriyama, Masaaki; Mogaki, Kazuhiko; Okumura, Yoshikazu; Watanabe, Kazuhiro

Review of Scientific Instruments, 71(2), p.755 - 757, 2000/02

 Times Cited Count:7 Percentile:48.44(Instruments & Instrumentation)

no abstracts in English

Journal Articles

JT-60U high performance regimes

Ishida, Shinichi; JT-60 Team

Nuclear Fusion, 39(9Y), p.1211 - 1226, 1999/09

 Times Cited Count:38 Percentile:75.67(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Development of heat conduction type cesium injection device for negative-ion source for JT-60U

*; Ito, Takao; Usui, Katsutomi; Mogaki, Kazuhiko; Kuriyama, Masaaki; Sato, Fujio*; Oshima, Katsumi*; Omori, Kenichiro; Watanabe, Kazuhiro

JAERI-Tech 99-054, 49 Pages, 1999/07

JAERI-Tech-99-054.pdf:1.92MB

no abstracts in English

Journal Articles

Conceptual design of JT-60SU

Ushigusa, Kenkichi

Purazuma, Kaku Yugo Gakkai-Shi, 74(2), p.117 - 125, 1998/02

no abstracts in English

Journal Articles

Present status of JT-60SU design

; Ushigusa, Kenkichi; Kikuchi, Mitsuru; Nagashima, Keisuke; Neyatani, Yuzuru; Miya, Naoyuki; ; Takahashi, Yoshikazu; Hayashi, Takumi; Kuriyama, Masaaki; et al.

Proc. of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 1, p.233 - 236, 1998/00

no abstracts in English

Journal Articles

Current drive by negative-ion-based neutral beam injector in JT-60U

Naito, Osamu; Oikawa, Toshihiro; Ushigusa, Kenkichi; Nemoto, Masahiro; Tobita, Kenji; Ide, Shunsuke; Kuriyama, Masaaki; Kamada, Yutaka; Kusama, Yoshinori

Proc. of 1998 ICPP & 25th EPS Conf. on Contr. Fusion and Plasma Physics, 22C, p.1182 - 1185, 1998/00

no abstracts in English

JAEA Reports

Investigation and measures to noise on spectroscopic measurement system in JT-60U

; *; *; *; Kubo, Hirotaka; Sugie, Tatsuo

JAERI-Tech 97-062, 21 Pages, 1997/11

JAERI-Tech-97-062.pdf:0.89MB

no abstracts in English

JAEA Reports

Review of JT-60U experimental results from February to November, 1996

JT-60 Team

JAERI-Research 97-047, 151 Pages, 1997/07

JAERI-Research-97-047.pdf:6.27MB

no abstracts in English

JAEA Reports

The Design study of the JT-60SU device, No.2; The physical design and diagnostic system of JT-60SU

; Nagashima, Keisuke; Tobita, Kenji; Neyatani, Yuzuru; Ushigusa, Kenkichi; Nagashima, Akira; Kubo, Hirotaka; Ozeki, Takahisa; Yamamoto, Takumi; Hosogane, Nobuyuki; et al.

JAERI-Research 97-023, 68 Pages, 1997/03

JAERI-Research-97-023.pdf:2.67MB

no abstracts in English

JAEA Reports

Stability of toroidal Alfven eigenmode in JT-60 super upgrade

Ozeki, Takahisa; C.Z.Cheng*; Nagashima, Keisuke

JAERI-Research 95-065, 22 Pages, 1995/10

JAERI-Research-95-065.pdf:0.75MB

no abstracts in English

22 (Records 1-20 displayed on this page)