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Title: Modeling of fast wave absorption by beam ions in DIII-D discharges

Abstract

In recent discharges on DIII-D, neutron measurements indicated absorption of the fast wave by energetic deuterium beam ions when the fourth harmonic resonance is on axis, but little or no interaction for the fifth harmonic. In this work, a geometric optics code is used to quantify the beam ion absorption of fast waves as the frequency (or on-axis harmonic resonance) is varied. Isotropic and anisotropic Maxwellians are used to model the beam ion distribution. Wave power flow in this harmonic range has been found to exhibit a strong poloidal and toroidal behavior in its initial transits across the plasma. Absorption along the rays is calculated using the fully thermal and magnetized treatment. Competing with the beam ions for absorption are the minority hydrogen and background electrons. The modeling results are only in partial agreement with experimental observations, indicating that more detailed physics may need to be included. (c) 1999 American Institute of Physics.

Authors:
 [1];  [2];  [3];  [4]
  1. Fusion Energy Research Program, University of California-San Diego, La Jolla, California 92093-0417 (United States)
  2. General Atomics, San Diego, California 92186 (United States)
  3. MIT, Cambridge, Massachusetts 02139 (United States)
  4. University of California, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
20216688
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal Issue: 1; Other Information: PBD: 20 Sep 1999; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICR HEATING; POWER RANGE 01-10 MW; PLASMA DENSITY; ION BEAMS; PLASMA SIMULATION; THEORETICAL DATA

Citation Formats

Mau, T. K., Petty, C. C., Porkolab, M., and Heidbrink, W. W. Modeling of fast wave absorption by beam ions in DIII-D discharges. United States: N. p., 1999. Web. doi:10.1063/1.59724.
Mau, T. K., Petty, C. C., Porkolab, M., & Heidbrink, W. W. Modeling of fast wave absorption by beam ions in DIII-D discharges. United States. doi:10.1063/1.59724.
Mau, T. K., Petty, C. C., Porkolab, M., and Heidbrink, W. W. Mon . "Modeling of fast wave absorption by beam ions in DIII-D discharges". United States. doi:10.1063/1.59724.
@article{osti_20216688,
title = {Modeling of fast wave absorption by beam ions in DIII-D discharges},
author = {Mau, T. K. and Petty, C. C. and Porkolab, M. and Heidbrink, W. W.},
abstractNote = {In recent discharges on DIII-D, neutron measurements indicated absorption of the fast wave by energetic deuterium beam ions when the fourth harmonic resonance is on axis, but little or no interaction for the fifth harmonic. In this work, a geometric optics code is used to quantify the beam ion absorption of fast waves as the frequency (or on-axis harmonic resonance) is varied. Isotropic and anisotropic Maxwellians are used to model the beam ion distribution. Wave power flow in this harmonic range has been found to exhibit a strong poloidal and toroidal behavior in its initial transits across the plasma. Absorption along the rays is calculated using the fully thermal and magnetized treatment. Competing with the beam ions for absorption are the minority hydrogen and background electrons. The modeling results are only in partial agreement with experimental observations, indicating that more detailed physics may need to be included. (c) 1999 American Institute of Physics.},
doi = {10.1063/1.59724},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}