EBW simulation for MAST and NSTX experiments

The interpretation of EBW emission from spherical tokamaks is nontrivial. We report on a 3D simulation model of this process that incorporates Gaussian beams for the antenna, a full wave solution of EBW-X and EBW-X-O conversions using adaptive finite elements, and EBW ray tracing to determine the ra...

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Bibliographic Details
Published in:AIP conference proceedings 2005-09, Vol.787 (1)
Main Authors: Preinhaelter, J., Urban, J., Pavlo, P., Taylor, G., Shevchenko, V., Valovic, M., Vahala, L., Vahala, G.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
BERNSTEIN MODE
COMPUTERIZED SIMULATION
CONVERSION
EDGE LOCALIZED MODES
ELECTRON TEMPERATURE
EQUILIBRIUM
H-MODE PLASMA CONFINEMENT
ION TEMPERATURE
MAGNETIC FIELDS
MAST TOKAMAK
NSTX DEVICE
PLASMA
PLASMA SIMULATION
PLASMA WAVES
RADIOMETERS
SPHERICAL CONFIGURATION
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Summary:The interpretation of EBW emission from spherical tokamaks is nontrivial. We report on a 3D simulation model of this process that incorporates Gaussian beams for the antenna, a full wave solution of EBW-X and EBW-X-O conversions using adaptive finite elements, and EBW ray tracing to determine the radiative temperature. This model is then used to interpret the experimental results from MAST and NSTX. EBW for ELM free H-modes in MAST suggests that the magnetic equilibrium determined by the EFIT code does not adequately represent the B-field within the transport barrier. Using the EBW signal for the reconstruction of the radial profile of the magnetic field, we determine a new equilibrium and see that the EBW simulation now yields better agreement with experimental results. EBW simulations yield excellent results for the time development of the plasma temperature as measured by the EBW radiometer on NSTX.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2098255