Study of increasing the beam power on the negative ion based neutral beam injector for JT-60 U

被引:6
作者
Kuriyama, M
Akino, N
Ebisawa, N
Grisham, L
Hikita, S
Honda, A
Itoh, T
Kawai, M
Kazawa, M
Kusaka, M
Kusanagi, N
Mogaki, K
Ohga, T
Oohara, H
Pengyuan, L
Satoh, F
Seki, H
Seki, N
Tanai, Y
Toyokawa, Y
Umeda, N
Usui, K
Yamazaki, H
机构
[1] Japan Atom Energy Res Inst, Naka Fus Res Estab, Naka, Ibaraki 3110193, Japan
[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
关键词
negative-ion; source plasma; neutral beam; ion source; JT-60U;
D O I
10.1016/S0920-3796(01)00341-6
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
The 500 keV negative-ion based neutral beam injector for JT-60U has been operated since 1996 and has injected so far a neutral beam power of 5.2 MW at 350 keV for 0.7 s. In order to further increase the beam power and extend the beam pulse duration time, a few issues concerning the negative ion source have to be solved. The most serious issue of them is non-uniformity of source plasma in the arc chamber. Two out of some countermeasures for improving the non-uniformity have been tried. The first is changing the spatial distribution of the arc discharge through regulating are current resistors which connect in series to each of eight filament groups. The second is masking both ends of the plasma grid with thin molybdenum plates to block beam extraction at the edges. Owing to these countermeasures, the acceleration efficiency of the deuterium negative ion beams in the accelerator has improved by more than 30% from 0.55 to 0.74. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:523 / 527
页数:5
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