Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments

G. H. Neilson; A. H. Reiman; M. C. Zarnstorff; A. Brooks; G. Y. fu; Robert James Goldston; L. P. ku; Z. Lin; R. Majeski; D. A. Monticello; H. Mynick; N. Pomphrey; M. H. Redi; W. T. Reiersen; J. A. Schmidt; S. P. Hirshman; J. F. Lyon; L. A. Berry; B. E. Nelson; R. Sanchez; D. A. Spong; A. H. Boozer; W. H. Miner; P. M. Valanju; W. A. Cooper; M. Drevlak; P. Merkel; C. Nuehrenberg

doi:10.1063/1.874015

Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments

G. H. Neilson, A. H. Reiman, M. C. Zarnstorff, A. Brooks, G. Y. fu, Robert James Goldston, L. P. ku, Z. Lin, R. Majeski, D. A. Monticello, H. Mynick, N. Pomphrey, M. H. Redi, W. T. Reiersen, J. A. Schmidt, S. P. Hirshman, J. F. Lyon, L. A. Berry, B. E. Nelson, R. SanchezD. A. Spong, A. H. Boozer, W. H. Miner, P. M. Valanju, W. A. Cooper, M. Drevlak, P. Merkel, C. Nuehrenberg

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Abstract

High-beta, low-aspect-ratio (“compact”) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2–4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A [formula omitted] quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a substantial bootstrap current and is shaped to stabilize ballooning, external kink, vertical, and neoclassical tearing modes without feedback or close-fitting conductors. Quasi-omnigeneous plasma configurations stable to ballooning modes at [formula omitted] have been evaluated for the Quasi-Omnigeneous Stellarator (QOS) experiment. These equilibria have relatively low bootstrap currents and are insensitive to changes in beta. Coil configurations have been calculated that reconstruct these plasma configurations, preserving their important physics properties. Theory- and experiment-based confinement analyses are used to evaluate the technical capabilities needed to reach target plasma conditions. The physics basis for these complementary experiments is described.

Original language	English (US)
Pages (from-to)	1911-1918
Number of pages	8
Journal	Physics of Plasmas
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.874015
State	Published - May 2000

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

Keywords

ASPECT RATIO
DESIGN
FEASIBILITY STUDIES
HIGH-BETA PLASMA
KINK INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
PLASMA CONFINEMENT
STELLARATORS
TEARING INSTABILITY

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10.1063/1.874015

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Neilson, G. H., Reiman, A. H., Zarnstorff, M. C., Brooks, A., fu, G. Y., Goldston, R. J., ku, L. P., Lin, Z., Majeski, R., Monticello, D. A., Mynick, H., Pomphrey, N., Redi, M. H., Reiersen, W. T., Schmidt, J. A., Hirshman, S. P., Lyon, J. F., Berry, L. A., Nelson, B. E., ... Nuehrenberg, C. (2000). Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments. Physics of Plasmas, 7(5), 1911-1918. https://doi.org/10.1063/1.874015

@article{6091ed80f2bf48ba910ab56bd6de3d43,

title = "Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments",

abstract = "High-beta, low-aspect-ratio (“compact”) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2–4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A [formula omitted] quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a substantial bootstrap current and is shaped to stabilize ballooning, external kink, vertical, and neoclassical tearing modes without feedback or close-fitting conductors. Quasi-omnigeneous plasma configurations stable to ballooning modes at [formula omitted] have been evaluated for the Quasi-Omnigeneous Stellarator (QOS) experiment. These equilibria have relatively low bootstrap currents and are insensitive to changes in beta. Coil configurations have been calculated that reconstruct these plasma configurations, preserving their important physics properties. Theory- and experiment-based confinement analyses are used to evaluate the technical capabilities needed to reach target plasma conditions. The physics basis for these complementary experiments is described.",

keywords = "ASPECT RATIO, DESIGN, FEASIBILITY STUDIES, HIGH-BETA PLASMA, KINK INSTABILITY, MAGNETIC FIELD CONFIGURATIONS, PLASMA CONFINEMENT, STELLARATORS, TEARING INSTABILITY",

author = "Neilson, {G. H.} and Reiman, {A. H.} and Zarnstorff, {M. C.} and A. Brooks and fu, {G. Y.} and Goldston, {Robert James} and ku, {L. P.} and Z. Lin and R. Majeski and Monticello, {D. A.} and H. Mynick and N. Pomphrey and Redi, {M. H.} and Reiersen, {W. T.} and Schmidt, {J. A.} and Hirshman, {S. P.} and Lyon, {J. F.} and Berry, {L. A.} and Nelson, {B. E.} and R. Sanchez and Spong, {D. A.} and Boozer, {A. H.} and Miner, {W. H.} and Valanju, {P. M.} and Cooper, {W. A.} and M. Drevlak and P. Merkel and C. Nuehrenberg",

year = "2000",

month = may,

doi = "10.1063/1.874015",

language = "English (US)",

volume = "7",

pages = "1911--1918",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics Publising LLC",

number = "5",

}

Neilson, GH, Reiman, AH, Zarnstorff, MC, Brooks, A, fu, GY, Goldston, RJ, ku, LP, Lin, Z, Majeski, R, Monticello, DA, Mynick, H, Pomphrey, N, Redi, MH, Reiersen, WT, Schmidt, JA, Hirshman, SP, Lyon, JF, Berry, LA, Nelson, BE, Sanchez, R, Spong, DA, Boozer, AH, Miner, WH, Valanju, PM, Cooper, WA, Drevlak, M, Merkel, P & Nuehrenberg, C 2000, 'Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments', Physics of Plasmas, vol. 7, no. 5, pp. 1911-1918. https://doi.org/10.1063/1.874015

TY - JOUR

T1 - Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments

AU - Neilson, G. H.

AU - Reiman, A. H.

AU - Zarnstorff, M. C.

AU - Brooks, A.

AU - fu, G. Y.

AU - Goldston, Robert James

AU - ku, L. P.

AU - Lin, Z.

AU - Majeski, R.

AU - Monticello, D. A.

AU - Mynick, H.

AU - Pomphrey, N.

AU - Redi, M. H.

AU - Reiersen, W. T.

AU - Schmidt, J. A.

AU - Hirshman, S. P.

AU - Lyon, J. F.

AU - Berry, L. A.

AU - Nelson, B. E.

AU - Sanchez, R.

AU - Spong, D. A.

AU - Boozer, A. H.

AU - Miner, W. H.

AU - Valanju, P. M.

AU - Cooper, W. A.

AU - Drevlak, M.

AU - Merkel, P.

AU - Nuehrenberg, C.

PY - 2000/5

Y1 - 2000/5

N2 - High-beta, low-aspect-ratio (“compact”) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2–4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A [formula omitted] quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a substantial bootstrap current and is shaped to stabilize ballooning, external kink, vertical, and neoclassical tearing modes without feedback or close-fitting conductors. Quasi-omnigeneous plasma configurations stable to ballooning modes at [formula omitted] have been evaluated for the Quasi-Omnigeneous Stellarator (QOS) experiment. These equilibria have relatively low bootstrap currents and are insensitive to changes in beta. Coil configurations have been calculated that reconstruct these plasma configurations, preserving their important physics properties. Theory- and experiment-based confinement analyses are used to evaluate the technical capabilities needed to reach target plasma conditions. The physics basis for these complementary experiments is described.

AB - High-beta, low-aspect-ratio (“compact”) stellarators are promising solutions to the problem of developing a magnetic plasma configuration for magnetic fusion power plants that can be sustained in steady state without disrupting. These concepts combine features of stellarators and advanced tokamaks and have aspect ratios similar to those of tokamaks (2–4). They are based on computed plasma configurations that are shaped in three dimensions to provide desired stability and transport properties. Experiments are planned as part of a program to develop this concept. A [formula omitted] quasi-axisymmetric plasma configuration has been evaluated for the National Compact Stellarator Experiment (NCSX). It has a substantial bootstrap current and is shaped to stabilize ballooning, external kink, vertical, and neoclassical tearing modes without feedback or close-fitting conductors. Quasi-omnigeneous plasma configurations stable to ballooning modes at [formula omitted] have been evaluated for the Quasi-Omnigeneous Stellarator (QOS) experiment. These equilibria have relatively low bootstrap currents and are insensitive to changes in beta. Coil configurations have been calculated that reconstruct these plasma configurations, preserving their important physics properties. Theory- and experiment-based confinement analyses are used to evaluate the technical capabilities needed to reach target plasma conditions. The physics basis for these complementary experiments is described.

KW - ASPECT RATIO

KW - DESIGN

KW - FEASIBILITY STUDIES

KW - HIGH-BETA PLASMA

KW - KINK INSTABILITY

KW - MAGNETIC FIELD CONFIGURATIONS

KW - PLASMA CONFINEMENT

KW - STELLARATORS

KW - TEARING INSTABILITY

UR - http://www.scopus.com/inward/record.url?scp=0000177326&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000177326&partnerID=8YFLogxK

U2 - 10.1063/1.874015

DO - 10.1063/1.874015

M3 - Article

AN - SCOPUS:0000177326

SN - 1070-664X

VL - 7

SP - 1911

EP - 1918

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

Physics issues in the design of high-beta, low-aspect-ratio stellarator experiments

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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