60 GHz, 200 kW CW gyrotron with high output mode purity

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6209475

Jory, H; Felch, K; Bier, R; Fox, L; Huey, H; Ives, L; Lopez, N; Manca, J; Shively, J; Spang, S

For the first time, a Varian 60 GHz gyrotron, designed specifically to generate microwaves in a single output mode, has been operated at power levels up to 200 kW CW. High output mode purity is required for the efficient utilization of gyrotrons as high power microwave sources for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Using mode-specific directional couplers, measurements of the output mode content indicated that greater than 95% of the microwave output was in the desired TE/sub 02/ mode, with only small percentages in the neighboring TE/sub 01/ and TE/sub 03/ circular electric modes. The pure mode CW design uses a 2.5-inch diameter collector. The collector has a magnetic field arrangement which capably avoids excessive heating by distributing the 640 kW CW beam over a sufficient collector area. With pure mode operation, window temperatures are 10/sup 0/C to 15/sup 0/C higher than with mixed mode operation.

• Research Organization: Varian Associates, Inc., Palo Alto, CA (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6209475
• Report Number(s): CONF-841234-4; ON: DE85005283
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
AMPLIFIERS
BEAMS
ECR HEATING
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
LEPTON BEAMS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
OPENINGS
PARTICLE BEAMS
PERFORMANCE
PLASMA HEATING
THERMAL CYCLING
WINDOWS