Material and electromagnetic properties of Faraday shields for ion cyclotron heating antennas

Conference · Mon Jul 01 04:00:00 EDT 1985 · Fusion Technol.; (United States)

OSTI ID:5793282

Hoffman, D J; Baity, F W; Becraft, W R; Caughman, J B.O.; Tsai, C C

The Faraday shields for ion cyclotron antennas must transmit magnetic waves and absorb little RF power. To investigate these properties, we have constructed 27 Faraday shields in many configurations, including chevrons, tubes, straps, concentric rings, various layered shields, conventionally leafed straps, and replicas of the Faraday shields for ASDEX, the Joint European Torus (JET), TEXTOR, and Alcator-C. We have measured the magnetic flux and observed loading at various operating resistances by using dielectric sheets or magnetic-coupled loads. Each Faraday shield effects a net change in the characteristic inductance of the antenna, resulting in a reduction of wave coupling. However, the load experienced by the antenna is not always reduced because the Faraday shield itself acts as a load. We differentiate between these effects experimentally. The net result of the study is that the Faraday shields now in use cost up to a factor of 50% of coupling. This, of course, reduces the power handling capability by 50% as well. However, configurations exist that are easily cooled and result in a reduction of less than 5% in loading.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, TN
• OSTI ID: 5793282
• Report Number(s): CONF-850310-
• Conference Information: Journal Name: Fusion Technol.; (United States) Journal Volume: 8:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
ALCATOR DEVICE
ANTENNAS
ASDEX TOKAMAK
CLOSED PLASMA DEVICES
CONFIGURATION
COUPLING
CYCLOTRON RESONANCE
EFFICIENCY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
FARADAY EFFECT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
ION CYCLOTRON-RESONANCE
JET TOKAMAK
MAGNETIC FLUX
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS TESTING
PERFORMANCE TESTING
PHYSICAL PROPERTIES
PLASMA HEATING
RESONANCE
SHIELDS
TESTING
TEXTOR TOKAMAK
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS