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Title: Experimental Demonstration of High Frequency ELM Pacing by Pellet Injection on DIII-D and Extrapolation to ITER

Abstract

. The injection of high repetition rate deuterium pellets is shown to trigger high-frequency edge localized modes (ELMs) in otherwise low natural ELM frequency H-mode deuterium discharges in the DIII-D tokamak. The resulting triggered ELMs have significantly lower energy and particle fluxes to the divertor than the natural ELMs. The plasma global energy confinement and density are not strongly affected by the pellet perturbations. The plasma core impurity density is strongly reduced with the application of the pellets. These experiments were performed in plasmas designed to match the ITER baseline configuration in shape and normalized operation with input power just above the H-mode power threshold. This strongly reduced ELM intensity shows promise for exploitation in ITER to control ELM size while maintaining high plasma purity and performance.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [2];  [3];  [3];  [4];  [5];  [5];  [5];  [1];  [6]
  1. ORNL
  2. General Atomics, San Diego
  3. Lawrence Livermore National Laboratory (LLNL)
  4. University of California, San Diego
  5. General Atomics
  6. ITER Organization, Cadarache, France
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1122640
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 24th IAEA Fusion Energy Conference, San Diego, CA, USA, 20121008, 20121013
Country of Publication:
United States
Language:
English

Citation Formats

Baylor, Larry R, Commaux, Nicolas JC, Jernigan, Thomas C, Meitner, Steven J, Brooks, N. H., Combs, Stephen Kirk, Evans, T. E., Fenstermacher, M. E., Lasnier, C. J., Moyer, R. A., Osborne, T. H., Parks, P. B., Strait, E. J., Unterberg, Ezekial A, and Loarte, A. Experimental Demonstration of High Frequency ELM Pacing by Pellet Injection on DIII-D and Extrapolation to ITER. United States: N. p., 2012. Web.
Baylor, Larry R, Commaux, Nicolas JC, Jernigan, Thomas C, Meitner, Steven J, Brooks, N. H., Combs, Stephen Kirk, Evans, T. E., Fenstermacher, M. E., Lasnier, C. J., Moyer, R. A., Osborne, T. H., Parks, P. B., Strait, E. J., Unterberg, Ezekial A, & Loarte, A. Experimental Demonstration of High Frequency ELM Pacing by Pellet Injection on DIII-D and Extrapolation to ITER. United States.
Baylor, Larry R, Commaux, Nicolas JC, Jernigan, Thomas C, Meitner, Steven J, Brooks, N. H., Combs, Stephen Kirk, Evans, T. E., Fenstermacher, M. E., Lasnier, C. J., Moyer, R. A., Osborne, T. H., Parks, P. B., Strait, E. J., Unterberg, Ezekial A, and Loarte, A. Sun . "Experimental Demonstration of High Frequency ELM Pacing by Pellet Injection on DIII-D and Extrapolation to ITER". United States.
@article{osti_1122640,
title = {Experimental Demonstration of High Frequency ELM Pacing by Pellet Injection on DIII-D and Extrapolation to ITER},
author = {Baylor, Larry R and Commaux, Nicolas JC and Jernigan, Thomas C and Meitner, Steven J and Brooks, N. H. and Combs, Stephen Kirk and Evans, T. E. and Fenstermacher, M. E. and Lasnier, C. J. and Moyer, R. A. and Osborne, T. H. and Parks, P. B. and Strait, E. J. and Unterberg, Ezekial A and Loarte, A.},
abstractNote = {. The injection of high repetition rate deuterium pellets is shown to trigger high-frequency edge localized modes (ELMs) in otherwise low natural ELM frequency H-mode deuterium discharges in the DIII-D tokamak. The resulting triggered ELMs have significantly lower energy and particle fluxes to the divertor than the natural ELMs. The plasma global energy confinement and density are not strongly affected by the pellet perturbations. The plasma core impurity density is strongly reduced with the application of the pellets. These experiments were performed in plasmas designed to match the ITER baseline configuration in shape and normalized operation with input power just above the H-mode power threshold. This strongly reduced ELM intensity shows promise for exploitation in ITER to control ELM size while maintaining high plasma purity and performance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {1}
}

Conference:
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