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Title: Fast wave direct electron heating in advanced inductive and ITER baseline scenario discharges in DIII-D

Fast Wave (FW) heating and electron cyclotron heating (ECH) are used in the DIII-D tokamak to study plasmas with low applied torque and dominant electron heating characteristic of burning plasmas. FW heating via direct electron damping has reached the 2.5 MW level in high performance ELMy H-mode plasmas. In Advanced Inductive (AI) plasmas, core FW heating was found to be comparable to that of ECH, consistent with the excellent first-pass absorption of FWs predicted by ray-tracing models at high electron beta. FW heating at the ∼2 MW level to ELMy H-mode discharges in the ITER Baseline Scenario (IBS) showed unexpectedly strong absorption of FW power by injected neutral beam (NB) ions, indicated by significant enhancement of the D-D neutron rate, while the intended absorption on core electrons appeared rather weak. The AI and IBS discharges are compared in an effort to identify the causes of the different response to FWs.
Authors:
; ; ;  [1] ;  [2] ; ; ;  [3] ; ;  [4] ; ; ; ; ; ;  [5] ; ;  [6] ;  [7] ;  [8]
  1. General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)
  2. University of Texas at Austin, Austin, Texas 78712 (United States)
  3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  4. University of California Los Angeles, Los Angeles, California 90095 (United States)
  5. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
  6. Politecnico di Torino, Dipartimento di Elettronica, Torino (Italy)
  7. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  8. Columbia University, New York, New York 10027 (United States)
Publication Date:
OSTI Identifier:
22263852
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1580; Journal Issue: 1; Conference: 20. topical conference on radiofrequency power in plasmas, Sorrento (Italy), 25-28 Jun 2013; Other Information: (c) 2014 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; ABSORPTION; DOUBLET-3 DEVICE; ECR HEATING; EDGE LOCALIZED MODES; ELECTRONS; H-MODE PLASMA CONFINEMENT; ITER TOKAMAK; PLASMA