Title :
Development of 170 GHz high power gyrotron and transmission line for ECH in JAERI
Author :
Takahashi, K. ; Sakamoto, K. ; Kasugai, A. ; Tsuneoka, M. ; Ikeda, Yu. ; Imai, T. ; Kariya, Tsuyoshi ; Hayashi, K. ; Mitsunaka, Y. ; Hirata, Y. ; Okazaki, Yasuo
Author_Institution :
RF Heating Lab., JAERI, Ibaraki, Japan
Abstract :
The high order mode escalation which reduces the heat load at the cavity of 170 GHz has succeeded without the adjacent mode competition. We performed 0.5 MW-0.75 sec and 0.175 MW-10 sec oscillation, but the output power was limited by the gyrotron window. For this solution, we have lately confirmed that the large size window disk of diamond manufactured by chemical vapor deposition (CVD) has the outstanding property; low loss tangent (tanδ⩽1.4×10-4) and high thermal conductivity (1800 W m-1 K-1) and is available for 0.5 MW continuous wave (cw) transmission. On the basis of the result above, the modified 170 GHz 0.5 MW, long pulse gyrotron with the diamond window has been fabricated. We will also construct the 100 GHz range transmission line and the high power (1 MW level) and long pulse transmission experiment will be carried out
Keywords :
Tokamak devices; fusion reactor design; gyrotrons; plasma radiofrequency heating; power supplies to apparatus; 170 GHz; adjacent mode competition; chemical vapor deposition; continuous wave transmission; diamond; gyrotron window; heat load; high order mode escalation; high power gyrotron; high thermal conductivity; long pulse gyrotron; long pulse transmission experiment; low loss tangent; output power; transmission line; Cathodes; Electrons; Gyrotrons; Heat engines; Insulation; Laboratories; Power generation; Power transmission lines; Radio frequency; Thermal conductivity;
Conference_Titel :
Fusion Engineering, 1997. 17th IEEE/NPSS Symposium
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4226-7
DOI :
10.1109/FUSION.1997.687074
