Progress in characterization of the pedestal stability and turbulence during the edge-localized-mode cycle on National Spherical Torus Experiment

被引：32

作者：

Diallo, A. ^{[1
]}

Canik, J. ^{[2
]}

Goeerler, T. ^{[3
]}

Ku, S. -H. ^{[1
]}

Kramer, G. J. ^{[1
]}

Osborne, T. ^{[4
]}

Snyder, P. ^{[4
]}

Smith, D. R. ^{[5
]}

Guttenfelder, W. ^{[1
]}

Bell, R. E. ^{[1
]}

Boyle, D. P. ^{[1
]}

Chang, C. -S. ^{[1
]}

LeBlanc, B. P. ^{[1
]}

Maingi, R. ^{[1
]}

Podesta, M. ^{[1
]}

Sabbagh, S. ^{[6
]}

机构：

[1] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08544 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN USA

[3] Max Planck Inst Plasma Phys, Garching, Germany

[4] Gen Atom, San Diego, CA USA

[5] Univ Wisconsin, Dept Engn Phys, Madison, WI USA

[6] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA

来源：

NUCLEAR FUSION | 2013年 / 53卷 / 09期

关键词：

D O I：

10.1088/0029-5515/53/9/093026

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Progress in characterizing the edge stability and properties of the microinstabilities responsible for enhanced transport in the pedestal region is reported. The stability of the pedestal is characterized in high performance discharges on National Spherical Torus Experiment. These high performance plasmas are found to be ideal kink-peeling and ideal infinite-n ballooning unstable prior to the onset of edge-localized modes (ELM). The spatial structure of turbulence present during an ELM cycle in the pedestal region indicates poloidal spatial scales k(theta)rho(pedi)(i) similar to 0.2 propagating in the ion diamagnetic drift direction at the pedestal top, and radial spatial scales k(r)rho(pedi)(i) similar to 0.7. These propagating spatial scales are found to be poloidally elongated and consistent with ion-scale microturbulence. Both global and local gyrokinetic simulations have been performed to identify the microturbulence structure. The local gyrokinetic analysis indicates the presence of a linearly unstable hybrid kinetic ballooning mode and trapped electron mode with spatial scale and propagation direction consistent with experimental observations. In the global gyrokinetic analysis, the nonlinearly saturated potential fluctuations show radial and poloidal correlation lengths in agreement with experimental density fluctuation correlation length measurements.

引用

页数：10

共 29 条

[1] Observation of ion scale fluctuations in the pedestal region during the edge-localized-mode cycle on the National Spherical Torus Experiment
Diallo, A.
Kramer, G. J.
Smith, D. R.
Maingi, R.
Bell, R. E.
Guttenfelder, W.
LeBlanc, B. P.
Podesta, M.
McKee, G. J.
Fonck, R.
[J]. PHYSICS OF PLASMAS, 2013, 20 (01)
[2] The impact of pedestal turbulence and electron inertia on edge-localized-mode crashes
Xi, P. W.
Xu, X. Q.
Diamond, P. H.
[J]. PHYSICS OF PLASMAS, 2014, 21 (05)
[3] Characterization and parametric dependencies of low wavenumber pedestal turbulence in the National Spherical Torus Experiment
Smith, D. R.
Fonck, R. J.
McKee, G. R.
Thompson, D. S.
Bell, R. E.
Diallo, A.
Guttenfelder, W.
Kaye, S. M.
LeBlanc, B. P.
Podesta, M.
[J]. PHYSICS OF PLASMAS, 2013, 20 (05)
[4] Primary edge localized mode filament structure in the National Spherical Torus Experiment
Maqueda, R. J.
Maingi, R.
[J]. PHYSICS OF PLASMAS, 2009, 16 (05)
[5] Edge-Localized-Mode Suppression through Density-Profile Modification with Lithium-Wall Coatings in the National Spherical Torus Experiment
Maingi, R.
Osborne, T. H.
LeBlanc, B. P.
Bell, R. E.
Manickam, J.
Snyder, P. B.
Menard, J. E.
Mansfield, D. K.
Kugel, H. W.
Kaita, R.
Gerhardt, S. P.
Sabbagh, S. A.
Kelly, F. A.
[J]. PHYSICAL REVIEW LETTERS, 2009, 103 (07)
[6] The enhanced pedestal H-mode in the National Spherical Torus experiment
Maingi, R.
Bell, R. E.
LeBlanc, B. P.
Gates, D. A.
Kaye, S. M.
Menard, J. E.
Sabbagh, S. A.
Yuh, H.
[J]. JOURNAL OF NUCLEAR MATERIALS, 2009, 390-91 : 440 - 443
[7] Measurements and simulations of low-wavenumber pedestal turbulence in the National Spherical Torus Experiment
Smith, D. R.
Parker, S. E.
Wan, W.
Chen, Y.
Diallo, A.
Dudson, B. D.
Fonck, R. J.
Guttenfelder, W.
McKee, G. R.
Kaye, S. M.
Thompson, D. S.
Bell, R. E.
LeBlanc, B. P.
Podesta, M.
[J]. NUCLEAR FUSION, 2013, 53 (11)
[8] Relationship between edge localized mode severity and electron transport in the National Spherical Torus Experiment
Tritz, K.
Kaye, S.
Maingi, R.
Sabbagh, S.
Stutman, D.
Bell, R.
Delgado-Aparicio, L.
Domier, C. W.
Finkenthal, M.
LeBlanc, B.
Lee, W.
Luhmann, N. C., Jr.
Mazzucato, E.
Park, H.
Smith, D. R.
[J]. PHYSICS OF PLASMAS, 2008, 15 (05)
[9] Characterization of small, Type V edge-localized modes in the National Spherical Torus Experiment
Maingi, R.
Bell, M. G.
Fredrickson, E. D.
Lee, K. C.
Maqueda, R. J.
Snyder, P.
Tritz, K.
Zweben, S. J.
Bell, R. E.
Biewer, T. M.
Bush, C. E.
Boedo, J.
Brooks, N. H.
Delgado-Aparicio, L.
Domier, C. W.
Gates, D. A.
Johnson, D. W.
Kaita, R.
Kaye, S. M.
Kugel, H. W.
LeBlanc, B. P.
Luhmann, N. C., Jr.
Menard, J. E.
Mueller, D.
Park, H.
Raman, R.
Roquemore, A. L.
Sabbagh, S. A.
Soukhanovskii, V. A.
Stevenson, T.
Stutman, D.
[J]. PHYSICS OF PLASMAS, 2006, 13 (09)
[10] Dynamical evolution of pedestal parameters in ELMy H-mode in the National Spherical Torus Experiment
Diallo, A.
Maingi, R.
Kubota, S.
Sontag, A.
Osborne, T.
Podesta, M.
Bell, R. E.
LeBlanc, B. P.
Menard, J.
Sabbagh, S.
[J]. NUCLEAR FUSION, 2011, 51 (10)

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