The steady state and high voltage test was carried out successfully on ICRF coaxial transmission line and ceramic feedthrough for LHD ICRF heating. The transmission line has 240 mm diameter and water cooling channel inside. The Teflon insulator with small recess is used. The coaxial line can stand for the high RF voltage of over 40kV for 30 minutes and of 60kV for 10 seconds. Three kinds of insulation gas was tested at 43MHz. SF6 and N2 gas are usable for high voltage and steady state operation but CO2 gas can not stand for over 30kV for several minutes. Various types of ceramic feedthrough were tested for steady state and high RF voltage in the test stand. The cone type alumina ceramic feedthrough having gas cooling system and cylinder type silicon nitride composite ceramic feedthrough worked very well. Ceramic temperature of the cone type was measured by IR thermometer. By using the enough gas flow rate, truly steady state operation was achieved.
|出版ステータス||出版済み - 1月 1 1998|
|イベント||Proceedings of the 1997 17th IEEE/NPSS Symposium on Fusion Engineering. Part 1 (of 2) - San Diego, CA, USA|
継続期間: 10月 6 1997 → 10月 10 1997
|その他||Proceedings of the 1997 17th IEEE/NPSS Symposium on Fusion Engineering. Part 1 (of 2)|
|City||San Diego, CA, USA|
|Period||10/6/97 → 10/10/97|
!!!All Science Journal Classification (ASJC) codes