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Yamano, Yasushi*; Akashi, Keisuke*; Kobayashi, Shinichi*; Tanaka, Yutaka; Kobayashi, Kaoru; Akino, Noboru; Hanada, Masaya; Ikeda, Yoshitaka
no journal, ,
no abstracts in English
Kojima, Atsushi; Hanada, Masaya; Yoshida, Masafumi; Akashi, Keisuke
no journal, ,
In this paper, the recent activities on the new test stand are reported toward demonstration of the long pulse production for 22A, 100s negative ion beams. As for the temperature control of the plasma grid, a prototype of the grid with cooling/heating by circulating a high-temperature fluorinated fluid has been developed. This grid was found to have a capability to control the temperature with a time constant of 10s by considering the physical properties of the fluid. As a result, 120 A/m
beams for 100 s have been achieved, which is about 90 percent of the rated value for JT-60SA.
Akashi, Keisuke; Kojima, Atsushi; Yoshida, Masafumi; Hanada, Masaya; Yamano, Yasushi*
no journal, ,
To improve the voltage holding capability of the large-size multi-aperture grid, the clarification of the mechanism of the break-down should be understood. However, the relation between the locally electric field and the break-down is still unclear. This time, this relation was investigated by direct measurement of the dark current density as the initiation of the break-down may be caused by the field-emitted electrons. As a result, the break-down probability increases with the current density, and current density of 0.1 mA/m cause the break-down at 50% in 10 s pulse.