Initial results from the multi-megawatt 110 GHz ECH system for the DIII-D tokamak

Conference · Tue Apr 01 00:00:00 EST 1997

OSTI ID:486158

Callis, R W; Lohr, J; O`Neill, R C; Ponce, D; Luce, T C; Prater, R ^[1]; Austin, M E ^[2]

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1. General Atomics, San Diego, CA (United States)
2. Texas Univ., Austin, TX (United States)

The first of three MW-level 110 GHz gyrotrons was operated into the DIII-D tokamak in late 1996. Two additional units will be commissioned during 1997. Each gyrotron is connected to the tokamak by a low loss, windowless, evacuated transmission line using circular corrugated waveguide carrying the HE{sub 11} mode. The microwave beam spot is well focused with a spot size of approximately 6 cm and can be steered poloidally from the center to the outer edge of the plasma. The initial operation with about 0.5 MW delivered to a low density plasma for 0.5 s showed good central electron heating, with peak temperature in excess of 10 keV. The injection was 19{degree} off perpendicular for current drive.

• Research Organization: General Atomics, San Diego, CA (United States); Univ. of Texas, Austin, TX (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114; FG03-96ER54373
• OSTI ID: 486158
• Report Number(s): GA-A22576; CONF-9704102-8; ON: DE97007604; TRN: 97:011298
• Resource Relation: Conference: 12. topical conference on radio frequency power in plasmas, Savannah, GA (United States), 1-3 Apr 1997; Other Information: PBD: Apr 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
DOUBLET-3 DEVICE
MICROWAVE AMPLIFIERS
ECR HEATING
RF SYSTEMS
OPERATION
PERFORMANCE