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Journal Articles

Recent R&D activities of negative-ion-based ion source for JT-60SA

Ikeda, Yoshitaka; Hanada, Masaya; Kamada, Masaki; Kobayashi, Kaoru; Umeda, Naotaka; Akino, Noboru; Ebisawa, Noboru; Inoue, Takashi; Honda, Atsushi; Kawai, Mikito; et al.

IEEE Transactions on Plasma Science, 36(4), p.1519 - 1529, 2008/08

 Times Cited Count:11 Percentile:41.29(Physics, Fluids & Plasmas)

The JT-60SA N-NBI system is required to inject 10 MW for 100 s at 500 keV. Three key issues should be solved for the JT-60SA N-NBI ion source. One is to improve the voltage holding capability. Recent R&D tests suggested that the accelerator with a large area of grids may need a high margin in the design of electric field and a long time for conditioning. The second issue is to reduce the grid power loading. It was found that some beamlets were strongly deflected due to beamlet-beamlet interaction and strike on the grounded grid. The grids are to be designed by taking account of beamlet-beamlet interaction in three-dimensional simulation. Third is to maintain the D- production for 100 s. A simple cooling structure is proposed for the active cooled plasma grid, where a key is the temperature gradient on the plasma grid for uniform D- production. The modified N-NBI ion source will start on JT-60SA in 2015.

Journal Articles

Long pulse production of high current D$$^{-}$$ ion beams in the JT-60 negative ion source

Hanada, Masaya; Kamada, Masaki; Akino, Noboru; Ebisawa, Noboru; Honda, Atsushi; Kawai, Mikito; Kazawa, Minoru; Kikuchi, Katsumi; Komata, Masao; Mogaki, Kazuhiko; et al.

Review of Scientific Instruments, 79(2), p.02A519_1 - 02A519_4, 2008/02

 Times Cited Count:6 Percentile:32.39(Instruments & Instrumentation)

A long pulse production of high-current, high-energy D$$^{-}$$ ion beams was studied in the JT-60U negative ion source that was designed to produce 22 A, 500 keV D$$^{-}$$ ion beams. Prior to the long pulse production, the short pulse beams were produced to examine operational ranges for a stable voltage holding capability and an allowable grid power loading. From a correlation between the voltage holding capability and a light intensity of cathodoluminescence from the insulator made of Fiber Reinforced Plastic insulator, the voltage holding was found to be stable at $$<$$ 340 kV where the light was sufficiently suppressed. The grid power loading for the long pulse operation was also decreased to the allowable level of $$<$$ 1 MW without a significant reduction of the beam power by tuning the extraction voltage (Vext) and the arc power (Parc). These allow the production of 30 A D$$^{-}$$ ion beams at 340 keV from two ion sources at Vacc = 340 kV. The pulse length was extended step by step, and finally reached up to 21 s, where the beam pulse length was limited by the surface temperature of the beam scraper without water cooling. The D$$^{-}$$ ion beams were neutralized to via a gas cell, resulting in a long pulse injection of 3.2 MW D$$^{0}$$ beams for 21 s. This is the first long injection of $$>$$ 20 s in a power range of $$>$$ 3 MW.

Journal Articles

Technical design of NBI system for JT-60SA

Ikeda, Yoshitaka; Akino, Noboru; Ebisawa, Noboru; Hanada, Masaya; Inoue, Takashi; Honda, Atsushi; Kamada, Masaki; Kawai, Mikito; Kazawa, Minoru; Kikuchi, Katsumi; et al.

Fusion Engineering and Design, 82(5-14), p.791 - 797, 2007/10

 Times Cited Count:20 Percentile:79.69(Nuclear Science & Technology)

Modification of JT-60U to a superconducting device (so called JT-60SA) has been planned to contribute to ITER and DEMO. The NBI system is required to inject 34 MW for 100 s. The upgraded NBI system consists of twelve positive ion based NBI (P-NBI) units and one negative ion based NBI (N-NBI) unit. The injection power of the P-NBI units are 2 MW each at 85 keV, and the N-NBI unit will be 10 MW at 500 keV, respectively. On JT-60U, the long pulse operation of 30 s at 2 MW (85 keV) and 20 s at 3.2 MW (320 keV) have been achieved on P-NBI and N-NBI units, respectively. Since the temperature increase of the cooling water in both ion sources is saturated within 20 s, further pulse extension up to 100 s is expected to mainly modify the power supply systems in addition to modification of the N-NBI ion source for high acceleration voltage. The detailed technical design of the NBI system for JT-60SA is presented.

Journal Articles

Operation of the negative-ion based NBI for JT-60U

Kuriyama, Masaaki; Akino, Noboru; *; Ito, Takao; Inoue, Takashi; Usui, Katsutomi; Ebisawa, Noboru; Oshima, Katsumi*; Ohara, Yoshihiro; Ohara, Hiroshi; et al.

Fusion Engineering and Design, 39-40, p.115 - 121, 1998/00

 Times Cited Count:34 Percentile:91.65(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of negative-ion based NBI system for JT-60

Kuriyama, Masaaki; Aoyagi, Tetsuo; ; *; Ito, Takao; Inoue, Takashi; Usami, H*; Usui, Katsutomi; ; Oshima, Katsumi*; et al.

Nihon Genshiryoku Gakkai-Shi, 38(11), p.912 - 922, 1996/00

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

no abstracts in English

JAEA Reports

None

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PNC TN8440 93-007, 103 Pages, 1992/12

PNC-TN8440-93-007.pdf:2.55MB

None

JAEA Reports

None

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PNC TN8440 92-053, 110 Pages, 1992/09

PNC-TN8440-92-053.pdf:2.74MB

None

JAEA Reports

None

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PNC TN8440 92-039, 104 Pages, 1992/06

PNC-TN8440-92-039.pdf:2.58MB

None

JAEA Reports

None

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PNC TN8440 92-028, 115 Pages, 1992/03

PNC-TN8440-92-028.pdf:2.91MB

None

JAEA Reports

None

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PNC TN8440 92-013, 104 Pages, 1991/12

PNC-TN8440-92-013.pdf:2.58MB

None

JAEA Reports

None

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PNC TN8440 92-001, 107 Pages, 1991/09

PNC-TN8440-92-001.pdf:2.66MB

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JAEA Reports

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PNC TN8440 91-053, 109 Pages, 1991/06

PNC-TN8440-91-053.pdf:2.68MB

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JAEA Reports

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PNC TN8440 91-032, 119 Pages, 1991/03

PNC-TN8440-91-032.pdf:2.82MB

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JAEA Reports

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PNC TN8440 91-010, 109 Pages, 1990/12

PNC-TN8440-91-010.pdf:2.66MB

None

JAEA Reports

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PNC TN8440 90-028, 113 Pages, 1990/09

PNC-TN8440-90-028.pdf:2.89MB

None

JAEA Reports

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PNC TN8440 89-012, 117 Pages, 1989/05

PNC-TN8440-89-012.pdf:3.02MB

None

Oral presentation

Experiment of voltage holding capability on the accelerator of JT-60U N-NBI ion source

Takenouchi, Tadashi; Akino, Noboru; Ikeda, Yoshitaka; Kamada, Masaki; Kawai, Mikito; Kikuchi, Katsumi; Tanai, Yutaka; Hanada, Masaya

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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