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Title: Energetic particle physics issues for three-dimensional toroidal configurations

Abstract

Energetic particle physics issues are of significant interest in stellarators and rippled tokamaks. The existence and stability of shear Alfven (SA) modes in stellarators have been examined computationally through a sequence of continuum, discrete eigenmode and {delta}f calculations. Although 3D couplings greatly increase the number of available SA modes, many of these are continuum damped. By identifying the more viable modes good contact has been made with experimental observations of TAE instabilities on LHD. Sound-wave or parallel compressibility couplings can modify the Alfven spectrum at low frequencies and have been incorporated into the STELLGAP code. Regions with coupled SA-sound continua are found in frequency ranges on the HSX experiment where coherent mode activity is observed. Finally, symmetry breaking effects are studied in ITER, taking into account TF ripple, ferritic inserts and tritium blanket modules. Finite {beta} 3D equilibria are obtained, indicating that ripple is amplified within the plasma by the self-consistent currents over vacuum levels.

Authors:
 [1];  [2];  [1];  [3];  [3];  [4];  [4];  [5]
  1. ORNL
  2. University of Texas
  3. University of California
  4. National Institute for Fusion Science, Toki, Japan
  5. Max-Planck-Institute for Plasmaphysik, EURATOM-Association, Greifswald, Germany
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
979113
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 22nd IAEA Fusion Energy Conference, Geneva, Switzerland, 20081013, 20081018
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPRESSIBILITY; FREQUENCY RANGE; IAEA; PHYSICS; PLASMA; SHEAR; STABILITY; STELLARATORS; SYMMETRY BREAKING; THERMONUCLEAR REACTORS; TOROIDAL CONFIGURATION; TRITIUM

Citation Formats

Spong, Donald A, Breizman, Boris, Berry, Lee A, David, Brower, Deng, C. B., Osakabe, M., Todo, Yasushi, and Konies, Axel. Energetic particle physics issues for three-dimensional toroidal configurations. United States: N. p., 2008. Web.
Spong, Donald A, Breizman, Boris, Berry, Lee A, David, Brower, Deng, C. B., Osakabe, M., Todo, Yasushi, & Konies, Axel. Energetic particle physics issues for three-dimensional toroidal configurations. United States.
Spong, Donald A, Breizman, Boris, Berry, Lee A, David, Brower, Deng, C. B., Osakabe, M., Todo, Yasushi, and Konies, Axel. 2008. "Energetic particle physics issues for three-dimensional toroidal configurations". United States.
@article{osti_979113,
title = {Energetic particle physics issues for three-dimensional toroidal configurations},
author = {Spong, Donald A and Breizman, Boris and Berry, Lee A and David, Brower and Deng, C. B. and Osakabe, M. and Todo, Yasushi and Konies, Axel},
abstractNote = {Energetic particle physics issues are of significant interest in stellarators and rippled tokamaks. The existence and stability of shear Alfven (SA) modes in stellarators have been examined computationally through a sequence of continuum, discrete eigenmode and {delta}f calculations. Although 3D couplings greatly increase the number of available SA modes, many of these are continuum damped. By identifying the more viable modes good contact has been made with experimental observations of TAE instabilities on LHD. Sound-wave or parallel compressibility couplings can modify the Alfven spectrum at low frequencies and have been incorporated into the STELLGAP code. Regions with coupled SA-sound continua are found in frequency ranges on the HSX experiment where coherent mode activity is observed. Finally, symmetry breaking effects are studied in ITER, taking into account TF ripple, ferritic inserts and tritium blanket modules. Finite {beta} 3D equilibria are obtained, indicating that ripple is amplified within the plasma by the self-consistent currents over vacuum levels.},
doi = {},
url = {https://www.osti.gov/biblio/979113}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2008},
month = {Tue Jan 01 00:00:00 EST 2008}
}

Conference:
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