Harmonic gyrotrons at 94 GHz

Author

Stutzman, R.C. ; McDermott, D.B. ; Gallagher, D.A. ; Armstrong, Carter M. ; Spencer, T.A. ; Luhmann, N.C., Jr.

Author_Institution

Dept. of Appl. Sci., California Univ., Davis, CA, USA

fYear

1999

Firstpage

166

Abstract

Summary form only given. 20-100 kW, 94 GHz, s=2-8 harmonic gyrotrons utilizing both MIG and Cusp electron guns are being developed at a new facility at UCD. The initial experiment will test a 50 kW, sixth-harmonic slotted gyrotron with a predicted efficiency of 20% that is driven by a 70 kV, 3.5 A, v/sub /spl perp///v/sub Z/=1.5, axis-encircling electron beam from a Cusp gun on order from Northrop Grumman. For a fixed ratio of Larmor radius to inner vane radius, slotted gyrotrons are fairly insensitive to the electron energy. The operating voltage was chosen for favorable beam propagation. Designs will also be presented for other planned 94-GHz high-harmonic gyrotrons with axis-encircling electron beams: a 4th-harmonic, 35 kW, 14% efficient, smooth-bore TE/sub 41/ gyrotron; a 4th-harmonic, 75 kW, 30% efficient, slotted gyrotron; and an 8th-harmonic, 22 kW, 9% efficient, slotted gyrotron.

Keywords

electron guns; gyrotrons; millimetre wave tubes; 20 to 100 kW; 3.5 A; 70 kV; 94 GHz; Cusp electron guns; Larmor radius; MIG electron guns; axis-encircling electron beam; axis-encircling electron beams; beam propagation; electron energy; harmonic gyrotrons; inner vane radius; sixth-harmonic slotted gyrotron; slotted gyrotron; slotted gyrotrons; smooth-bore TE/sub 41/ gyrotron; Bandwidth; Circuit simulation; Contracts; Electron beams; Electron guns; Gain; Gyrotrons; Predictive models; Testing; User centered design;

fLanguage

English

Publisher

ieee

Conference_Titel

Plasma Science, 1999. ICOPS '99. IEEE Conference Record - Abstracts. 1999 IEEE International Conference on

Conference_Location

Monterey, CA, USA

ISSN

0730-9244

Print_ISBN

0-7803-5224-6

Type

conf

DOI

10.1109/PLASMA.1999.829424

Filename

829424