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

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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).

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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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