Global confinement and discrete dynamo activity in the MST reversed-field pinch

S. Hokin; A. Almagri; S. Assadi; J. Beckstead; G. Chartas; N. Crocker; M. Cudzinovic; D. Den Hartog; R. Dexter; D. Holly; S. Prager; T. Rempel; J. Sarff; E. Scime; W. Shen; C. Spragins; C. Sprott; G. Starr; M. Stoneking; C. Watts; R. Nebel

doi:10.1063/1.859642

Global confinement and discrete dynamo activity in the MST reversed-field pinch

S. Hokin
, A. Almagri
, S. Assadi
, J. Beckstead
, G. Chartas
, N. Crocker
, M. Cudzinovic
, D. Den Hartog
, R. Dexter
, D. Holly
, S. Prager
, T. Rempel
, J. Sarff
, E. Scime
, W. Shen
, C. Spragins
, C. Sprott
, G. Starr
, M. Stoneking
, C. Watts

R. Nebel

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

66 Scopus citations

Abstract

Results obtained on the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] after installation of the design poloidal field winding are presented. Values of β_θe0≡2μ ₀n_e0T_e0/B_θ²(a) ∼12% are achieved in low-current (I=220 kA) operation; here, n_e0 and T_e0 are central electron density and temperature, and B _θ (a) is the poloidal magnetic field at the plasma edge. An observed decrease in β_θe0 with increasing plasma current may be due to inadequate fueling, enhanced wall interaction, and the growth of a radial field error at the vertical cut in the shell at high current. Energy confinement time varies little with plasma current, lying in the range of 0.5-1.0 msec. Strong discrete dynamo activity is present, characterized by the coupling of m = 1, n = 5-7 modes leading to an m = 0, n = 0 crash (m and n are poloidal and toroidal mode numbers). The m = 0 crash generates toroidal flux and produces a small (2.5%) increase in plasma current.

Original language	English (US)
Pages (from-to)	2241-2246
Number of pages	6
Journal	Physics of Fluids B
Volume	3
Issue number	8
DOIs	https://doi.org/10.1063/1.859642
State	Published - 1991

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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10.1063/1.859642

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Hokin, S., Almagri, A., Assadi, S., Beckstead, J., Chartas, G., Crocker, N., Cudzinovic, M., Den Hartog, D., Dexter, R., Holly, D., Prager, S., Rempel, T., Sarff, J., Scime, E., Shen, W., Spragins, C., Sprott, C., Starr, G., Stoneking, M., ... Nebel, R. (1991). Global confinement and discrete dynamo activity in the MST reversed-field pinch. Physics of Fluids B, 3(8), 2241-2246. https://doi.org/10.1063/1.859642

@article{f05cc8b2b8b4421e9194f4c24d570109,

title = "Global confinement and discrete dynamo activity in the MST reversed-field pinch",

abstract = "Results obtained on the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] after installation of the design poloidal field winding are presented. Values of βθe0≡2μ 0ne0Te0/Bθ2(a) ∼12\% are achieved in low-current (I=220 kA) operation; here, ne0 and Te0 are central electron density and temperature, and B θ (a) is the poloidal magnetic field at the plasma edge. An observed decrease in βθe0 with increasing plasma current may be due to inadequate fueling, enhanced wall interaction, and the growth of a radial field error at the vertical cut in the shell at high current. Energy confinement time varies little with plasma current, lying in the range of 0.5-1.0 msec. Strong discrete dynamo activity is present, characterized by the coupling of m = 1, n = 5-7 modes leading to an m = 0, n = 0 crash (m and n are poloidal and toroidal mode numbers). The m = 0 crash generates toroidal flux and produces a small (2.5\%) increase in plasma current.",

author = "S. Hokin and A. Almagri and S. Assadi and J. Beckstead and G. Chartas and N. Crocker and M. Cudzinovic and \{Den Hartog\}, D. and R. Dexter and D. Holly and S. Prager and T. Rempel and J. Sarff and E. Scime and W. Shen and C. Spragins and C. Sprott and G. Starr and M. Stoneking and C. Watts and R. Nebel",

year = "1991",

doi = "10.1063/1.859642",

language = "English (US)",

volume = "3",

pages = "2241--2246",

journal = "Physics of Fluids B",

issn = "0899-8221",

publisher = "American Institute of Physics",

number = "8",

}

Hokin, S, Almagri, A, Assadi, S, Beckstead, J, Chartas, G, Crocker, N, Cudzinovic, M, Den Hartog, D, Dexter, R, Holly, D, Prager, S, Rempel, T, Sarff, J, Scime, E, Shen, W, Spragins, C, Sprott, C, Starr, G, Stoneking, M, Watts, C & Nebel, R 1991, 'Global confinement and discrete dynamo activity in the MST reversed-field pinch', Physics of Fluids B, vol. 3, no. 8, pp. 2241-2246. https://doi.org/10.1063/1.859642

TY - JOUR

T1 - Global confinement and discrete dynamo activity in the MST reversed-field pinch

AU - Hokin, S.

AU - Almagri, A.

AU - Assadi, S.

AU - Beckstead, J.

AU - Chartas, G.

AU - Crocker, N.

AU - Cudzinovic, M.

AU - Den Hartog, D.

AU - Dexter, R.

AU - Holly, D.

AU - Prager, S.

AU - Rempel, T.

AU - Sarff, J.

AU - Scime, E.

AU - Shen, W.

AU - Spragins, C.

AU - Sprott, C.

AU - Starr, G.

AU - Stoneking, M.

AU - Watts, C.

AU - Nebel, R.

PY - 1991

Y1 - 1991

N2 - Results obtained on the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] after installation of the design poloidal field winding are presented. Values of βθe0≡2μ 0ne0Te0/Bθ2(a) ∼12% are achieved in low-current (I=220 kA) operation; here, ne0 and Te0 are central electron density and temperature, and B θ (a) is the poloidal magnetic field at the plasma edge. An observed decrease in βθe0 with increasing plasma current may be due to inadequate fueling, enhanced wall interaction, and the growth of a radial field error at the vertical cut in the shell at high current. Energy confinement time varies little with plasma current, lying in the range of 0.5-1.0 msec. Strong discrete dynamo activity is present, characterized by the coupling of m = 1, n = 5-7 modes leading to an m = 0, n = 0 crash (m and n are poloidal and toroidal mode numbers). The m = 0 crash generates toroidal flux and produces a small (2.5%) increase in plasma current.

AB - Results obtained on the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] after installation of the design poloidal field winding are presented. Values of βθe0≡2μ 0ne0Te0/Bθ2(a) ∼12% are achieved in low-current (I=220 kA) operation; here, ne0 and Te0 are central electron density and temperature, and B θ (a) is the poloidal magnetic field at the plasma edge. An observed decrease in βθe0 with increasing plasma current may be due to inadequate fueling, enhanced wall interaction, and the growth of a radial field error at the vertical cut in the shell at high current. Energy confinement time varies little with plasma current, lying in the range of 0.5-1.0 msec. Strong discrete dynamo activity is present, characterized by the coupling of m = 1, n = 5-7 modes leading to an m = 0, n = 0 crash (m and n are poloidal and toroidal mode numbers). The m = 0 crash generates toroidal flux and produces a small (2.5%) increase in plasma current.

UR - https://www.scopus.com/pages/publications/36449005957

UR - https://www.scopus.com/pages/publications/36449005957#tab=citedBy

U2 - 10.1063/1.859642

DO - 10.1063/1.859642

M3 - Article

AN - SCOPUS:36449005957

SN - 0899-8221

VL - 3

SP - 2241

EP - 2246

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 8

ER -

Global confinement and discrete dynamo activity in the MST reversed-field pinch

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