First JT-60 high power 110 to 130 MHz test results with an X2242 tetrode

Author

Moriyama, S. ; Ogawa, Y. ; Fujii, T. ; Anno, K. ; Shinozaki, S. ; Terakado, M. ; Kimura, H. ; Saigusa, M. ; Kobayashi, N. ; Ohta, M. ; Nagashima, T. ; Oihara, K. ; Azuma, K. ; Shimizu, K. ; Yamane, Y. ; Remsen, D. ; Loring, M.

Author_Institution

Naka Fusion Res. Establ., JAERI, Ibaraki, Japan

fYear

1989

fDate

2-6 Oct 1989

Firstpage

1424

Abstract

Tests of the X2242 were run in the JAERI (Japan Atomic Energy Research Institute) Tokamak-60 (JT-60) ICRF (ion cyclotron range of frequencies) system. The tests evaluated this newly developed tetrode´s performance under conditions relevant to the planned CIT (Compact Ignition Tokamak) and JT-60U (JT-60 Upgrade) ICRF systems. The behavior of a large high-power tube at frequencies above 100 MHz was also studied. Complete instrumentation was provided, including an acoustic monitor that senses boiling at the tube anode to permit prompt diagnosis. High-power test results were 1.6 MW for 0.5 s at 131 MHz, 1.0 MW for 10 s at 131 MHz, and 1.5 MW for 6 s at 110 MHz. Performance was studied under load VSWR of 1.5 and 2 over a 0 to 360° phase range. With a VSWR of 1.5, plate dissipation was 1.4 times higher than that of matched load

Keywords

Tokamak devices; fusion reactor theory and design; plasma radiofrequency heating; tetrodes; 110 to 130 MHz; CIT; Compact Ignition Tokamak; JT-60; JT-60 Upgrade; JT-60U; X2242 tetrode; acoustic monitor; boiling; high-power tube; instrumentation; plate dissipation; prompt diagnosis; tube anode; Circuit testing; Heating; Performance evaluation; Plasmas; Power generation; Protection; Radio frequency; System testing; Tuners; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1989. Proceedings., IEEE Thirteenth Symposium on

Conference_Location

Knoxville, TN

Type

conf

DOI

10.1109/FUSION.1989.102478

Filename

102478