A study of coupling and edge processes for ICRF antennas

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7055456

Lehrman, I S

Coupling and edge-plasma models are developed in order to ascertain the relevant physical processes at work in coupling ICRF power to plasmas and to determine their effect on impurity generation. Experimental measurements were made on the PLT tokamak, which identified the energized antenna as a significant particle source. The rate of increase of metallic impurities was found to be 2.7 times larger than the corresponding increase in deuterium. The increase in release of deuterium and impurities was {approximately}3-4 times greater at the energized antenna. Electron heating was observed close to the surface of the Faraday shield. Coupling models are developed to model the PLT antennas and cavity antennas for CIT and TFTR. These models suggest improvements to ICRF antennas, which reduce the rf antenna electric fields and increase the coupling. Modeling of the edge-plasma antenna region indicates that the ponderomotive force, resulting from ripple in the antenna near-field structure, increases particle transport by a factor of two for 400 kW of applied power. Kinetic modeling indicates that the ICRF near field acts to increase the sputtering yield of ions that impact the shield by a factor of 1.6

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 7055456
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700103 -- Fusion Energy-- Plasma Research-- Kinetics
ANTENNAS
COUPLING
CYCLOTRON RESONANCE
ELECTRICAL EQUIPMENT
EQUIPMENT
FARADAY EFFECT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
IMPURITIES
PLASMA HEATING
PLT DEVICES
POWER INPUT
RESONANCE
SHIELDS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS