Antenna-plasma coupling theory for ICRF heating of large tokamaks
The coupling characteristics of antenna structure are studied by analyzing a model where a thin current sheet is placed between a fully conducting wall and a sheet of anisotropic conductivity representing the screen. The inhomogeneous plasma in the shadow of the limiter is assumed to extend from the screen onwards away from the antenna. The excitation of the fields inside the plasma are found by analyzing the radiation properties of this current sheet antenna. We assume that the current distribution of the antenna is given and that the fields excited inside the plasma are absorbed in a single pass. In all experiments to-date the cross-sectional plasmas are relatively small so that the rf conductor is a half-loop around the plasma in the poloidal direction. However, for reactor size plasmas this cannot be done and the antenna dimensions will be small compared to the plasma cross-sections. We, thus, assume an antenna of finite poloidal and toroidal extent with dimensions small compared to the plasma minor radius. We further approximate the coupling geometry by a slab model. The x-axis is taken to be along the plasma inhomogeneity, the y-axis along the poloidal direction and the x-axis along the toroidal magnetic field.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
- DOE Contract Number:
- AC02-78ET51013
- OSTI ID:
- 5184533
- Report Number(s):
- DOE/ET/51013-38; PFC/CP-82-2; CONF-820345-8; ON: DE82013226
- Country of Publication:
- United States
- Language:
- English
Similar Records
Antenna-plasma coupling theory for ICRF heating of large tokamaks
Alcator C-Mod ICRF antenna and matching circuit
Related Subjects
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ANISOTROPY
ANTENNAS
CLOSED PLASMA DEVICES
COUPLING
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
INHOMOGENEOUS PLASMA
PHYSICAL PROPERTIES
PLASMA
PLASMA HEATING
SIZE
THERMONUCLEAR DEVICES
TOKAMAK DEVICES