Control of plasma shape and performance of the PBX-M tokamak experiment in high-βt/high-βp regimes

R. E. Bell; N. Asakura; S. Bernabei; M. S. Chance; P. A. Duperrex; R. J. Fonck; G. M. Gammel; G. Greene; R. E. Hatcher; A. Holland; S. C. Jardin; T. W. Jiang; R. Kaita; S. M. Kaye; C. E. Kessel; H. W. Kugel; B. LeBlanc; F. M. Levinton; M. Okabayashi; M. Ono; S. F. Paul; E. T. Powell; Y. Qin; D. W. Roberts; N. R. Sauthoff; S. Sesnic; H. Takahashi

doi:10.1063/1.859542

Control of plasma shape and performance of the PBX-M tokamak experiment in high-β_t/high-β_p regimes

R. E. Bell
, N. Asakura
, S. Bernabei
, M. S. Chance
, P. A. Duperrex
, R. J. Fonck
, G. M. Gammel
, G. Greene
, R. E. Hatcher
, A. Holland
, S. C. Jardin
, T. W. Jiang
, R. Kaita
, S. M. Kaye
, C. E. Kessel
, H. W. Kugel
, B. LeBlanc
, F. M. Levinton
, M. Okabayashi
, M. Ono

S. F. Paul, E. T. Powell, Y. Qin, D. W. Roberts, N. R. Sauthoff, S. Sesnic, H. Takahashi

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

56 Scopus citations

Abstract

The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (β_t), and high-beta poloidal (β_p), and show evidence of the suppression of external surface modes by the passive stabilizing system. Values of β_t up to 4.0 I/aB (% MA/m T) with 'T _i(0)≈4keV have been obtained. A magnetohydrodynamic analysis of plasmas with β_p=2.0 indicates that these plasmas are near the threshold of the second stability regime. A value of β_t of 6.8% has been reached with T_i(0)>5 keV and an indentation of 28%. Control of plasma shape is accomplished with a feedback system that uses a moment expansion about a single equilibrium and is augmented by time-dependent waveforms to redefine plasma shape. Diagnostics to measure the safety factor q have been developed and used to make accurate measurements q(r) and to verify changes made in q(0).

Original language	English (US)
Pages (from-to)	1271-1279
Number of pages	9
Journal	Physics of Fluids B
Volume	2
Issue number	6
DOIs	https://doi.org/10.1063/1.859542
State	Published - 1990

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
General Physics and Astronomy
Fluid Flow and Transfer Processes

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10.1063/1.859542

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Bell, R. E., Asakura, N., Bernabei, S., Chance, M. S., Duperrex, P. A., Fonck, R. J., Gammel, G. M., Greene, G., Hatcher, R. E., Holland, A., Jardin, S. C., Jiang, T. W., Kaita, R., Kaye, S. M., Kessel, C. E., Kugel, H. W., LeBlanc, B., Levinton, F. M., Okabayashi, M., ... Takahashi, H. (1990). Control of plasma shape and performance of the PBX-M tokamak experiment in high-β_t/high-β_p regimes. Physics of Fluids B, 2(6), 1271-1279. https://doi.org/10.1063/1.859542

@article{b2b3cbd019df4ab6bf0a64af75da7174,

title = "Control of plasma shape and performance of the PBX-M tokamak experiment in high-βt/high-βp regimes",

abstract = "The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (βt), and high-beta poloidal (βp), and show evidence of the suppression of external surface modes by the passive stabilizing system. Values of βt up to 4.0 I/aB (\% MA/m T) with 'T i(0)≈4keV have been obtained. A magnetohydrodynamic analysis of plasmas with βp=2.0 indicates that these plasmas are near the threshold of the second stability regime. A value of βt of 6.8\% has been reached with Ti(0)>5 keV and an indentation of 28\%. Control of plasma shape is accomplished with a feedback system that uses a moment expansion about a single equilibrium and is augmented by time-dependent waveforms to redefine plasma shape. Diagnostics to measure the safety factor q have been developed and used to make accurate measurements q(r) and to verify changes made in q(0).",

author = "Bell, \{R. E.\} and N. Asakura and S. Bernabei and Chance, \{M. S.\} and Duperrex, \{P. A.\} and Fonck, \{R. J.\} and Gammel, \{G. M.\} and G. Greene and Hatcher, \{R. E.\} and A. Holland and Jardin, \{S. C.\} and Jiang, \{T. W.\} and R. Kaita and Kaye, \{S. M.\} and Kessel, \{C. E.\} and Kugel, \{H. W.\} and B. LeBlanc and Levinton, \{F. M.\} and M. Okabayashi and M. Ono and Paul, \{S. F.\} and Powell, \{E. T.\} and Y. Qin and Roberts, \{D. W.\} and Sauthoff, \{N. R.\} and S. Sesnic and H. Takahashi",

year = "1990",

doi = "10.1063/1.859542",

language = "English (US)",

volume = "2",

pages = "1271--1279",

journal = "Physics of Fluids B",

issn = "0899-8221",

publisher = "American Institute of Physics",

number = "6",

}

Bell, RE, Asakura, N, Bernabei, S, Chance, MS, Duperrex, PA, Fonck, RJ, Gammel, GM, Greene, G, Hatcher, RE, Holland, A, Jardin, SC, Jiang, TW, Kaita, R, Kaye, SM, Kessel, CE, Kugel, HW, LeBlanc, B, Levinton, FM, Okabayashi, M, Ono, M, Paul, SF, Powell, ET, Qin, Y, Roberts, DW, Sauthoff, NR, Sesnic, S & Takahashi, H 1990, 'Control of plasma shape and performance of the PBX-M tokamak experiment in high-β_t/high-β_p regimes', Physics of Fluids B, vol. 2, no. 6, pp. 1271-1279. https://doi.org/10.1063/1.859542

TY - JOUR

T1 - Control of plasma shape and performance of the PBX-M tokamak experiment in high-βt/high-βp regimes

AU - Bell, R. E.

AU - Asakura, N.

AU - Bernabei, S.

AU - Chance, M. S.

AU - Duperrex, P. A.

AU - Fonck, R. J.

AU - Gammel, G. M.

AU - Greene, G.

AU - Hatcher, R. E.

AU - Holland, A.

AU - Jardin, S. C.

AU - Jiang, T. W.

AU - Kaita, R.

AU - Kaye, S. M.

AU - Kessel, C. E.

AU - Kugel, H. W.

AU - LeBlanc, B.

AU - Levinton, F. M.

AU - Okabayashi, M.

AU - Ono, M.

AU - Paul, S. F.

AU - Powell, E. T.

AU - Qin, Y.

AU - Roberts, D. W.

AU - Sauthoff, N. R.

AU - Sesnic, S.

AU - Takahashi, H.

PY - 1990

Y1 - 1990

N2 - The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (βt), and high-beta poloidal (βp), and show evidence of the suppression of external surface modes by the passive stabilizing system. Values of βt up to 4.0 I/aB (% MA/m T) with 'T i(0)≈4keV have been obtained. A magnetohydrodynamic analysis of plasmas with βp=2.0 indicates that these plasmas are near the threshold of the second stability regime. A value of βt of 6.8% has been reached with Ti(0)>5 keV and an indentation of 28%. Control of plasma shape is accomplished with a feedback system that uses a moment expansion about a single equilibrium and is augmented by time-dependent waveforms to redefine plasma shape. Diagnostics to measure the safety factor q have been developed and used to make accurate measurements q(r) and to verify changes made in q(0).

AB - The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (βt), and high-beta poloidal (βp), and show evidence of the suppression of external surface modes by the passive stabilizing system. Values of βt up to 4.0 I/aB (% MA/m T) with 'T i(0)≈4keV have been obtained. A magnetohydrodynamic analysis of plasmas with βp=2.0 indicates that these plasmas are near the threshold of the second stability regime. A value of βt of 6.8% has been reached with Ti(0)>5 keV and an indentation of 28%. Control of plasma shape is accomplished with a feedback system that uses a moment expansion about a single equilibrium and is augmented by time-dependent waveforms to redefine plasma shape. Diagnostics to measure the safety factor q have been developed and used to make accurate measurements q(r) and to verify changes made in q(0).

UR - https://www.scopus.com/pages/publications/0038081077

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U2 - 10.1063/1.859542

DO - 10.1063/1.859542

M3 - Article

AN - SCOPUS:0038081077

SN - 0899-8221

VL - 2

SP - 1271

EP - 1279

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 6

ER -

Control of plasma shape and performance of the PBX-M tokamak experiment in high-β_t/high-β_p regimes

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