Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U
Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U
复制标题
JT-60U 500keV负离子中性束注入系统的运行和开发
DOI：
10.13182/fst02-a237
复制
发表时间：
2002
影响因子：
0.9
通讯作者：
T. Yamamoto
中科院分区：
文献类型：
--
作者：
M. Kuriyama;N. Akino;N. Ebisawa;L. Grisham;A. Honda;T. Itoh;M. Kawai;M. Kazawa;K. Mogaki;Y. Ohara;T. Ohga;Y. Okumura;H. Oohara;N. Umeda;K. Usui;K. Watanabe;M. Yamamoto;T. Yamamoto
JT-60U型500keV负离子中性束注入器于1996年开始运行，通过优化离子源运行参数，克服加速器高压击穿带来的离子源和电源问题，束流功率逐渐提高。然而，为了进一步提高束功率和束能量，离子源仍有一些问题有待解决。其中最严重的问题是电弧室内等离子体源的不均匀性。已采取各种对策来改善不均匀性。其中一些对策已被发现在减少源等离子体的不均匀性方面部分有效，因此，到目前为止，离子源已用氘将负离子束加速到 403keV 下的 17.4A，用氢加速到 360keV 下的 20A，而目标是 500keV 下的 22A。氘气注入等离子体的中性束注入功率在 400keV 时达到 5.8MW。为实现 500keV 10MW 的目标，我们仍在继续努力。
The 500-keV negative-ion based neutral beam injector for JT-60U started operation in 1996. The beam power has been increased gradually through optimizing operation parameters of the ion sources and conquering many troubles in the ion source and power supplies caused by a high voltage break-down in the accelerator. However, some issues remain to be solved concerning the ion source for increasing further the beam power and the beam energy. The most serious issue of them is non-uniformity of source plasma in the arc chamber. Various countermeasures have been implemented to improve the non-uniformity. Some of those countermeasures have been found to be partially effective in reducing the non-uniformity of the source plasma, and as the result the ion source, so far, has accelerated negative-ion beams of 17.4A at 403keV with deuterium and 20A at 360keV with hydrogen against the goal of 22A at 500keV. The neutral beam injection power into the plasma has reached 5.8MW at 400keV with deuterium. Further efforts to reach the target of 10MW at 500keV have been continued.