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Hanada, Masaya; Kojima, Atsushi; JT-60NBI Group; Yamano, Yasushi*; Kobayashi, Shinichi*
Denki Gakkai Kenkyukai Shiryo, Hoden Kenkyukai (ED-12-35), 6 Pages, 2012/03
Negative ion accelerator for neutral beam injectors for fusion appliaction has large-area acceleration grids of 
1 m
and an insulator made of Fiber Reinforced Plastics (FRP), which are extremely larger than those used in the accelerators for industrial and acceleration applications. This paper reports vacuum insulation character its and development for the improvement of voltage holding capability towards JT-60SA.
Kojima, Atsushi; Hanada, Masaya; Hilmi, A.*; Haruyama, Hirochika*; Yamano, Yasushi*; Kobayashi, Shinichi*
Denki Gakkai Kenkyukai Shiryo, Hoden Kenkyukai (ED-12-36), 5 Pages, 2012/03
Vacuum insulation of a large negative ion source for fusion application is experimentally examined, which is characterized by large-area grids with multiple-apertures. The experimental results showed that sustainable voltages were found to be dominated by the electric field profiles generated around the apertures and grid area. These empirical laws are applied to the modification of the ion source.
