Gas puff fueled H-mode discharges with good energy confinement above the Greenwald density limit on DIII-D

被引:21
作者
Osborne, TH
Mahdavi, MA
Chu, M
Fenstermacher, ME
La Haye, R
Leonard, AW
McKee, G
Petrie, TW
Rettig, C
Wade, M
Watkins, J
机构
[1] Gen Atom Co, San Diego, CA 92138 USA
[2] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[3] Univ Wisconsin, Madison, WI 53706 USA
[4] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[5] Oak Ridge Natl Lab, Oak Ridge, TN USA
[6] Sandia Natl Labs, Livermore, CA 94550 USA
关键词
density limit; DIII-D; edge plasma;
D O I
10.1016/S0022-3115(00)00660-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tokamak discharges with electron densities as high as 1.4 times the Greenwald density, and good energy confinement, H-ITER89P = 1.9, were obtained with D-2 gas puffing on DIII-D. The divertor configuration of these discharges, low triangularity with pumping of the private flux region, was important in avoiding a transition to the L-mode or Type III ELM regimes in which energy confinement was reduced. Although these discharges show a decrease in H-mode pedestal energy at high density through reduction in the edge pressure gradient, peaking of the density profile compensated for the effect of this decrease on the overall stored energy. Spontaneous density profile peaking occurred under conditions which enhance the neoclassical Ware pinch. The high density phase was terminated by an internal MHD event that has the characteristics of a neoclassical tearing mode. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1013 / 1017
页数:5
相关论文
共 17 条
  • [1] Density profile consistency and its relation to the transport of trapped versus passing electrons in tokamaks
    Baker, DR
    Rosenbluth, MN
    [J]. PHYSICS OF PLASMAS, 1998, 5 (08) : 2936 - 2941
  • [2] Studies of reactor-relevant H-mode regimes in the JET-pumped divertor
    Campbell, DJ
    Bickley, A
    Chankin, A
    Clement, S
    Davies, SJ
    Ehrenberg, J
    Erents, SK
    Guo, HY
    Harbour, PJ
    Horton, L
    Lingertat, J
    Loarte, A
    Lowry, CG
    McCormick, K
    Maggi, C
    Matthews, GF
    Monk, R
    OBrien, D
    Reichle, R
    Righi, E
    Saibene, G
    Stamp, M
    Start, DFH
    Stork, D
    Vlases, GC
    vonHellermann, M
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 1996, 38 (08) : 1497 - 1501
  • [3] Modification of high mode pedestal instabilities in the DIII-D tokamak
    Ferron, JR
    Chu, MS
    Jackson, GL
    Lao, LL
    Miller, RL
    Osborne, TH
    Snyder, PB
    Strait, EJ
    Taylor, TS
    Turnbull, AD
    Garofalo, AM
    Makowski, MA
    Rice, BW
    Chance, MS
    Baylor, LR
    Murakami, M
    Wade, MR
    [J]. PHYSICS OF PLASMAS, 2000, 7 (05) : 1976 - 1983
  • [4] HUBBARD AE, 1997, P 16 INT FUS EN C MO, V1, P875
  • [5] JANESCHITZ J, 1999, P 26 EPS C CONTR F J, V23, P1445
  • [6] MERTENS V, 1997, PLASMA PHYS CONTROLL, V1, P413
  • [7] The effect of plasma shape on H-mode pedestal characteristics on DIII-D
    Osborne, TH
    Ferron, JR
    Groebner, RJ
    Lao, LL
    Leonard, AW
    Mahdavi, MA
    Maingi, R
    Miller, RL
    Turnbull, AD
    Wade, M
    Watkins, J
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 2000, 42 : A175 - A184
  • [8] Perkins FW, 1999, NUCL FUSION, V39, P2137, DOI 10.1088/0029-5515/39/12/301
  • [9] LINEAR-STABILITY OF RESISTIVE MHD MODES - AXISYMMETRICAL TOROIDAL COMPUTATION OF THE OUTER REGION MATCHING DATA
    PLETZER, A
    BONDESON, A
    Dewar, RL
    [J]. JOURNAL OF COMPUTATIONAL PHYSICS, 1994, 115 (02) : 530 - 549
  • [10] POGUTSE O, 1997, CONTROLLED FUSIO A 3, V21, P1041