Title :
Breakdown Phenomena in the Negative Ion Source of 500 keV Negative-Ion Based NBI System on JT-60U
Author :
Hanada, Masaya ; Ikeda, Yoshitaka ; Kamada, Masaki ; Kikuchi, Katsumi ; Komata, Masao ; Mogaki, Kazuhiko ; Umeda, Naotaka ; Usui, Katsutomi ; Grisham, Larry R. ; Kobayashi, Shinichi
Author_Institution :
Japan Atomic Energy Agency, Ibaraki
Abstract :
The breakdown phenomena in the 500 keV electrostatic accelerator with large FRP insulators for the fusion application was examined without the beam acceleration. When the high voltage was applied, the light emission with a broad peak at a wavelength of 420 nm was mostly emitted inside the accelerator even though breakdown did not occur. It was found that the voltage holding capability has a strong correlation with the light intensity, and that stable voltage holding was realized under the conditions in which light emission was well suppressed
Keywords :
electric breakdown; electrostatic accelerators; ion sources; organic insulating materials; 420 nm; 500 keV; JT-60U; NBI system; breakdown phenomena; electrostatic accelerator; fusion application; large FRP insulators; light emission; negative ion source; voltage holding capability; Acceleration; Breakdown voltage; Electric breakdown; Electrostatics; Fiber reinforced plastics; Ion accelerators; Ion sources; Plasma accelerators; Plasma sources; Vacuum breakdown;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 2006. ISDEIV '06. International Symposium on
Conference_Location :
Matsue
Print_ISBN :
1-4244-0191-7
Electronic_ISBN :
1093-2941
DOI :
10.1109/DEIV.2006.357403
