110 GHz ECH Heating System For DIII-D

Conference · Mon Aug 19 04:00:00 EDT 1991 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.41658· OSTI ID:5182816

Callis, R. ^[1]; Cary, W. ^[1]; Moeller, C. ^[1]; Freeman, R. ^[1]; Prater, R. ^[1]; Remsen, D. ^[1]; Sevier, L. ^[1]

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1. General Atomics, San Diego, CA (United States)

Electron cyclotron heating (ECH) has been demonstrated to be effective at heating tokamak plasmas in DIII-D and other tokamaks. Extension of these results to higher frequency and higher power in DIII-D is planned using 110 GHz outside launch X-mode at the second harmonic. A 2 MW system constructed from four modules, each using a Varian 0.5 MW 110 GHz gyrotron, is scheduled to be completed by May 1992; construction of a complete 0.5 MW module is complete and is in checkout. The results of the engineering test will be reported. A unique feature of this design is the use of strongly guided HE₁₁ modes to transmit the power over the long distances required. The choice of a strongly guided HE₁₁ mode for transmitting the ECH power was influenced by the compact waveguide, the non-critical alignment which allows waveguide flex, the ability to use mode selective directional couplers, and finally, continuous curvature bends can be used since there are no trapped modes. The waveguide is evacuated to handle the required power density. Implementation of this design required the development of mode converters to convert from the TE_15.2 mode generated by the gyrotron to the desired HE₁₁. Results of the high power tests of the mode converters and transmission components will be presented.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 5182816
• Report Number(s): GA-A-20627; CONF-910869--6; ON: DE91018732
• Conference Information: Journal Name: AIP Conference Proceedings Journal Volume: 244
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
AMPLIFIERS
CLOSED PLASMA DEVICES
DOUBLET-3 DEVICE
ECR HEATING
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 100-1000
HEATING
HIGH-FREQUENCY HEATING
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
PLASMA HEATING
POWER DENSITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
WAVEGUIDES