Effect of current profile shape on second region access in high-beta tokamak plasmas

M. W. Phillips; M. H. Hughes; A. M.M. Todd; M. Okabayashi; S. M. Kaye; B. Leblanc

doi:10.1063/1.859243

Effect of current profile shape on second region access in high-beta tokamak plasmas

M. W. Phillips
, M. H. Hughes
, A. M.M. Todd
, M. Okabayashi
, S. M. Kaye
, B. Leblanc

PPPL NSTX

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

2 Scopus citations

Abstract

The effect of current density distribution in tokamak plasmas is examined on the access to the second stability regime of high-n ballooning modes. The main factor in determining access to the second stability regime is to lower shear sufficiently on each flux surface. This is achieved by broadening the current profile. A general method of finding equilibria with access to the second region of stability is presented. The value of on-axis safety factor q₀ is found not to be a good measure of the type of profile required for second region access.

Original language	English (US)
Pages (from-to)	973-977
Number of pages	5
Journal	Physics of Fluids B
Volume	2
Issue number	5
DOIs	https://doi.org/10.1063/1.859243
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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10.1063/1.859243

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abstract = "The effect of current density distribution in tokamak plasmas is examined on the access to the second stability regime of high-n ballooning modes. The main factor in determining access to the second stability regime is to lower shear sufficiently on each flux surface. This is achieved by broadening the current profile. A general method of finding equilibria with access to the second region of stability is presented. The value of on-axis safety factor q0 is found not to be a good measure of the type of profile required for second region access.",

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AU - Phillips, M. W.

AU - Hughes, M. H.

AU - Todd, A. M.M.

AU - Okabayashi, M.

AU - Kaye, S. M.

AU - Leblanc, B.

PY - 1990

Y1 - 1990

N2 - The effect of current density distribution in tokamak plasmas is examined on the access to the second stability regime of high-n ballooning modes. The main factor in determining access to the second stability regime is to lower shear sufficiently on each flux surface. This is achieved by broadening the current profile. A general method of finding equilibria with access to the second region of stability is presented. The value of on-axis safety factor q0 is found not to be a good measure of the type of profile required for second region access.

AB - The effect of current density distribution in tokamak plasmas is examined on the access to the second stability regime of high-n ballooning modes. The main factor in determining access to the second stability regime is to lower shear sufficiently on each flux surface. This is achieved by broadening the current profile. A general method of finding equilibria with access to the second region of stability is presented. The value of on-axis safety factor q0 is found not to be a good measure of the type of profile required for second region access.

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UR - https://www.scopus.com/pages/publications/6244271659#tab=citedBy

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JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 5

ER -

Effect of current profile shape on second region access in high-beta tokamak plasmas

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