Wall stabilization of high beta plasmas in DIII-D

T. S. Taylor; E. J. Strait; L. Lao; M. Mauel; A. D. Turnbull; K. H. Burrell; M. S. Chu; J. R. Ferron; R. J. Groebner; R. J. La Haye; B. W. Rice; R. T. Snider; S. J. Thompson; D. Wròblewski; D. J. Lightly

doi:10.1063/1.871262

Wall stabilization of high beta plasmas in DIII-D

T. S. Taylor
, E. J. Strait
, L. Lao
, M. Mauel
, A. D. Turnbull
, K. H. Burrell
, M. S. Chu
, J. R. Ferron
, R. J. Groebner
, R. J. La Haye
, B. W. Rice
, R. T. Snider
, S. J. Thompson
, D. Wròblewski
, D. J. Lightly

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Article › peer-review

86 Citations (Scopus)

Abstract

Detailed analysis of recent high beta discharges in the DIII-D [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] tokamak demonstrates that the resistive vacuum vessel can provide stabilization of low n magnetohydrodynamic (MHD) modes. The experimental beta values reaching up to β_T=12.6% are more than 30% larger than the maximum stable beta calculated with no wall stabilization. Plasma rotation is essential for stabilization. When the plasma rotation slows sufficiently, unstable modes with the characteristics of the predicted "resistive wall" mode are observed. Through slowing of the plasma rotation between the q=2 and q=3 surfaces with the application of a nonaxisymmetric field, it has been determined that the rotation at the outer rational surfaces is most important, and that the critical rotation frequency is of the order of Ω/2π=1 kHz.

Original language	English
Pages (from-to)	2390-2396
Number of pages	7
Journal	Physics of Plasmas
Volume	2
Issue number	6
DOIs	https://doi.org/10.1063/1.871262
Publication status	Published - 1995

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.871262

Cite this

@article{8d1bb6e8170e480187b71de8199e53d7,

title = "Wall stabilization of high beta plasmas in DIII-D",

abstract = "Detailed analysis of recent high beta discharges in the DIII-D [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] tokamak demonstrates that the resistive vacuum vessel can provide stabilization of low n magnetohydrodynamic (MHD) modes. The experimental beta values reaching up to βT=12.6\% are more than 30\% larger than the maximum stable beta calculated with no wall stabilization. Plasma rotation is essential for stabilization. When the plasma rotation slows sufficiently, unstable modes with the characteristics of the predicted {"}resistive wall{"} mode are observed. Through slowing of the plasma rotation between the q=2 and q=3 surfaces with the application of a nonaxisymmetric field, it has been determined that the rotation at the outer rational surfaces is most important, and that the critical rotation frequency is of the order of Ω/2π=1 kHz.",

author = "Taylor, \{T. S.\} and Strait, \{E. J.\} and L. Lao and M. Mauel and Turnbull, \{A. D.\} and Burrell, \{K. H.\} and Chu, \{M. S.\} and Ferron, \{J. R.\} and Groebner, \{R. J.\} and \{La Haye\}, \{R. J.\} and Rice, \{B. W.\} and Snider, \{R. T.\} and Thompson, \{S. J.\} and D. Wr{\`o}blewski and Lightly, \{D. J.\}",

year = "1995",

doi = "10.1063/1.871262",

language = "English",

volume = "2",

pages = "2390--2396",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics Publising LLC",

number = "6",

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TY - JOUR

T1 - Wall stabilization of high beta plasmas in DIII-D

AU - Taylor, T. S.

AU - Strait, E. J.

AU - Lao, L.

AU - Mauel, M.

AU - Turnbull, A. D.

AU - Burrell, K. H.

AU - Chu, M. S.

AU - Ferron, J. R.

AU - Groebner, R. J.

AU - La Haye, R. J.

AU - Rice, B. W.

AU - Snider, R. T.

AU - Thompson, S. J.

AU - Wròblewski, D.

AU - Lightly, D. J.

PY - 1995

Y1 - 1995

N2 - Detailed analysis of recent high beta discharges in the DIII-D [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] tokamak demonstrates that the resistive vacuum vessel can provide stabilization of low n magnetohydrodynamic (MHD) modes. The experimental beta values reaching up to βT=12.6% are more than 30% larger than the maximum stable beta calculated with no wall stabilization. Plasma rotation is essential for stabilization. When the plasma rotation slows sufficiently, unstable modes with the characteristics of the predicted "resistive wall" mode are observed. Through slowing of the plasma rotation between the q=2 and q=3 surfaces with the application of a nonaxisymmetric field, it has been determined that the rotation at the outer rational surfaces is most important, and that the critical rotation frequency is of the order of Ω/2π=1 kHz.

AB - Detailed analysis of recent high beta discharges in the DIII-D [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] tokamak demonstrates that the resistive vacuum vessel can provide stabilization of low n magnetohydrodynamic (MHD) modes. The experimental beta values reaching up to βT=12.6% are more than 30% larger than the maximum stable beta calculated with no wall stabilization. Plasma rotation is essential for stabilization. When the plasma rotation slows sufficiently, unstable modes with the characteristics of the predicted "resistive wall" mode are observed. Through slowing of the plasma rotation between the q=2 and q=3 surfaces with the application of a nonaxisymmetric field, it has been determined that the rotation at the outer rational surfaces is most important, and that the critical rotation frequency is of the order of Ω/2π=1 kHz.

UR - https://www.scopus.com/pages/publications/0001137407

UR - https://www.scopus.com/pages/publications/0001137407#tab=citedBy

U2 - 10.1063/1.871262

DO - 10.1063/1.871262

M3 - Article

AN - SCOPUS:0001137407

SN - 1070-664X

VL - 2

SP - 2390

EP - 2396

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 6

ER -

Wall stabilization of high beta plasmas in DIII-D

Abstract

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