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

T.W. Petrie; B. Grierson; T.H. Osborne; F. Turco; S.L. Allen; M.E. Fenstermacher; J.R. Ferron; H.Y. Guo; E. Hinson; R. La Haye; C.J. Lasnier; A.W. Leonard; T.C. Luce; C. Petty; D. Thomas; B. Victor; H. Wang; J.G. Watkins

Nuclear Materials and Energy (May 2019)

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

T.W. Petrie,
B. Grierson,
T.H. Osborne,
F. Turco,
S.L. Allen,
M.E. Fenstermacher,
J.R. Ferron,
H.Y. Guo,
E. Hinson,
R. La Haye,
C.J. Lasnier,
A.W. Leonard,
T.C. Luce,
C. Petty,
D. Thomas,
B. Victor,
H. Wang,
J.G. Watkins

Affiliations

T.W. Petrie: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA; Corresponding author.
B. Grierson: Princeton Plasma Physics Laboratory, Princeton, NJ, USA
T.H. Osborne: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
F. Turco: Columbia University, New York, NY, USA
S.L. Allen: Lawrence Livermore National Laboratory, Livermore, CA, USA
M.E. Fenstermacher: Lawrence Livermore National Laboratory, Livermore, CA, USA
J.R. Ferron: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
H.Y. Guo: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
E. Hinson: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
R. La Haye: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
C.J. Lasnier: Lawrence Livermore National Laboratory, Livermore, CA, USA
A.W. Leonard: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
T.C. Luce: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
C. Petty: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
D. Thomas: General Atomics, P.O. Box 85608, San Diego, CA 92186-5608, USA
B. Victor: Lawrence Livermore National Laboratory, Livermore, CA, USA
H. Wang: Oak Ridge Associated Universities, Oak Ridge, TN, USA
J.G. Watkins: Sandia National Laboratories, Albuquerque, NM, USA

Journal volume & issue: Vol. 19
pp. 267 – 272

Abstract

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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. JEL classification: Divertor Materials (D0500), Impurities (10100), Plasma Properties (P0600), Keywords: DIII-D, Edge pedestal, Energy confinement, Gas injection and fueling impurity, Power deposition

Published in Nuclear Materials and Energy

ISSN: 2352-1791 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-materials-and-energy/

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