Single-stage, depressed collector operation of an 84 GHz gyrotron

Author

CHU, T.S. ; Borchard, P. ; Cahalan, P. ; Felch, K. ; Loring, C.M. ; Shimozuma, Takashi ; Sato, Mitsuhisa

Author_Institution

Commun. Power Ind., Palo Alto, CA, USA

fYear

1997

fDate

19-22 May 1997

Firstpage

270

Lastpage

271

Abstract

Summary form only given. Efficient, high-power millimeter-wave sources are needed in electron cyclotron heating (ECH) for many present and future fusion experiments. CPI, in collaboration with the National Institute of Fusion Sciences, Japan, is developing high-power, CW gyrotrons with an internal converter at 84 GHz for ECH in the Large Helical Device (LHD) Heliotron. The first prototype of this kind of tube has been tested to long pulse and 200 kW, CW. The second prototype has been fabricated and is currently being tested at CPI. In addition to the improved cooling and vacuum pumping capability of the present tube, it is designed to operate with a single stage depressed collector.

Keywords

gyrotrons; millimetre wave tubes; plasma radiofrequency heating; stellarators; 1 MW; 200 kW; 50 A; 80 kV; 84 GHz; Large Helical Device Heliotron; cooling; electron cyclotron heating; fusion experiments; gyrotron; high-power CW gyrotrons; high-power millimeter-wave sources; internal converter; single-stage depressed collector operation; vacuum pumping; Cooling; Electrons; Gyrotrons; Laser theory; Optical pulse shaping; Prototypes; Pulse amplifiers; Testing; Undulators; X-ray lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Science, 1997. IEEE Conference Record - Abstracts., 1997 IEEE International Conference on

Conference_Location

San Diego, CA, USA

ISSN

0730-9244

Print_ISBN

0-7803-3990-8

Type

conf

DOI

10.1109/PLASMA.1997.605047

Filename

605047