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Title: High-performance finite-difference time-domain simulations of C-Mod and ITER RF antennas

Finite-difference time-domain methods have, in recent years, developed powerful capabilities for modeling realistic ICRF behavior in fusion plasmas [1, 2, 3, 4]. When coupled with the power of modern high-performance computing platforms, such techniques allow the behavior of antenna near and far fields, and the flow of RF power, to be studied in realistic experimental scenarios at previously inaccessible levels of resolution. In this talk, we present results and 3D animations from high-performance FDTD simulations on the Titan Cray XK7 supercomputer, modeling both Alcator C-Mod’s field-aligned ICRF antenna and the ITER antenna module. Much of this work focuses on scans over edge density, and tailored edge density profiles, to study dispersion and the physics of slow wave excitation in the immediate vicinity of the antenna hardware and SOL. An understanding of the role of the lower-hybrid resonance in low-density scenarios is emerging, and possible implications of this for the NSTX launcher and power balance are also discussed. In addition, we discuss ongoing work centered on using these simulations to estimate sputtering and impurity production, as driven by the self-consistent sheath potentials at antenna surfaces.
Authors:
;  [1]
  1. Tech-X Corporation, 5621 Arapahoe Avenue Suite A, Boulder, CO 80303 (United States)
Publication Date:
OSTI Identifier:
22496181
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1689; Journal Issue: 1; Conference: 21. topical conference on radio frequency power in plasmas, Lake Arrowhead, CA (United States), 27-29 Apr 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALCATOR DEVICE; ANTENNAS; BALANCES; DENSITY; EXCITATION; FINITE DIFFERENCE METHOD; ICR HEATING; IMPURITIES; ION CYCLOTRON-RESONANCE; ITER TOKAMAK; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; NSTX DEVICE; PERFORMANCE; PLASMA; RF SYSTEMS; SIMULATION; SPUTTERING; THREE-DIMENSIONAL CALCULATIONS