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Title: High-performance double-null plasmas under radiating mantle scenarios on DIII-D

Abstract

Actively enhancing plasma radiated power has been used to reduce divertor heat flux in high power, high-performance double null divertor (DND) and near-DND plasmas in DIII-D, while at the same time maintaining acceptable energy confinement. One form of this approach that we focus on here is the radiating mantle. The effectiveness of the radiating mantle was found to depend strongly on the location of electron cyclotron (EC) heating deposition and on the effect that seed impurities have on triggering inimical MHD activity inside the plasma. In addition, we present experimental support for the predictions made by the ELITE boundary stability code (Snyder et al., 2002, [1]) for ways to improve confinement and fueling in these high-performance plasmas. Representative AT operating conditions were H 98 ≈ 1.4–1.7, β N ≈ 3–4, and q 95 ≈ 4.7–6.5.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3];  [4];  [4];  [1];  [1];  [1];  [1];  [4];  [1];  [1];  [1];  [1];  [4];  [5];  [6]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Columbia Univ., New York, NY (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  6. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Columbia Univ., New York, NY (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1502965
Grant/Contract Number:  
FC02-04ER54698; AC52-07NA27344; AC02-09CH11466; FG02-04ER54761; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 19; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIII-D; edge pedestal; energy confinement; gas injection and fueling impurity; power deposition

Citation Formats

Petrie, T. W., Grierson, B., Osborne, T. H., Turco, F., Allen, S. L., Fenstermacher, M. E., Ferron, J. R., Guo, H. Y., Hinson, E., La Haye, R., Lasnier, C. J., Leonard, A. W., Luce, T. C., Petty, C., Thomas, D., Victor, B., Wang, H., and Watkins, J. G. High-performance double-null plasmas under radiating mantle scenarios on DIII-D. United States: N. p., 2019. Web. doi:10.1016/j.nme.2019.01.028.
Petrie, T. W., Grierson, B., Osborne, T. H., Turco, F., Allen, S. L., Fenstermacher, M. E., Ferron, J. R., Guo, H. Y., Hinson, E., La Haye, R., Lasnier, C. J., Leonard, A. W., Luce, T. C., Petty, C., Thomas, D., Victor, B., Wang, H., & Watkins, J. G. High-performance double-null plasmas under radiating mantle scenarios on DIII-D. United States. doi:10.1016/j.nme.2019.01.028.
Petrie, T. W., Grierson, B., Osborne, T. H., Turco, F., Allen, S. L., Fenstermacher, M. E., Ferron, J. R., Guo, H. Y., Hinson, E., La Haye, R., Lasnier, C. J., Leonard, A. W., Luce, T. C., Petty, C., Thomas, D., Victor, B., Wang, H., and Watkins, J. G. Fri . "High-performance double-null plasmas under radiating mantle scenarios on DIII-D". United States. doi:10.1016/j.nme.2019.01.028. https://www.osti.gov/servlets/purl/1502965.
@article{osti_1502965,
title = {High-performance double-null plasmas under radiating mantle scenarios on DIII-D},
author = {Petrie, T. W. and Grierson, B. and Osborne, T. H. and Turco, F. and Allen, S. L. and Fenstermacher, M. E. and Ferron, J. R. and Guo, H. Y. and Hinson, E. and La Haye, R. and Lasnier, C. J. and Leonard, A. W. and Luce, T. C. and Petty, C. and Thomas, D. and Victor, B. and Wang, H. and Watkins, J. G.},
abstractNote = {Actively enhancing plasma radiated power has been used to reduce divertor heat flux in high power, high-performance double null divertor (DND) and near-DND plasmas in DIII-D, while at the same time maintaining acceptable energy confinement. One form of this approach that we focus on here is the radiating mantle. The effectiveness of the radiating mantle was found to depend strongly on the location of electron cyclotron (EC) heating deposition and on the effect that seed impurities have on triggering inimical MHD activity inside the plasma. In addition, we present experimental support for the predictions made by the ELITE boundary stability code (Snyder et al., 2002, [1]) for ways to improve confinement and fueling in these high-performance plasmas. Representative AT operating conditions were H98 ≈ 1.4–1.7, βN ≈ 3–4, and q95 ≈ 4.7–6.5.},
doi = {10.1016/j.nme.2019.01.028},
journal = {Nuclear Materials and Energy},
number = ,
volume = 19,
place = {United States},
year = {2019},
month = {3}
}

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