First tests of the Varian EIMAC X2242 at 110 and 130 MHz in the JT-60 ICRH system

Author

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

Author_Institution

Varian EIMAC, San Carlos, CA, USA

fYear

1989

fDate

2-6 Oct 1989

Firstpage

1428

Abstract

The Varian EIMAC X2242 utilizes pyrolytic graphite screen and control grids and a high-density mesh cathode in a new multimegawatt tetrode. It is capable of delivery 3 MW of output power. The first tests of the device performed in a modified, well-instrumented, JAERI (Japan Atomic Energy Research Institute) Tokamak-60 (JT-60) ICRH (ion cyclotron range of frequencies) amplifier, are described. The tests were run at 110 and 131 MHz at pulse widths to 10 s. Output power to 1.5 MW at 110 MHz and 1.6 MW at 131 MHz was observed. The amplifier was stable with significant reverse screen grid current. Internal examination of the tube after its return showed it to be undamaged, illustrating the high-temperature capabilities of pyrolytic graphite. Means of increasing tube power output at these frequencies are being developed

Keywords

Tokamak devices; fusion reactor theory and design; plasma radiofrequency heating; tetrodes; Varian EIMAC X2242; high-density mesh cathode; multimegawatt tetrode; pyrolytic graphite screen; Anodes; Capacitance; Cogeneration; Conductivity; Heating; Power generation; Radio frequency; System testing; Temperature dependence; 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.1989.102479

Filename

102479