Experimental study of axisymmetric instability of inverse-dee and square tokamak equilibria

B. Lipschultz; S. C. Prager; T. H. Osborne; J. C. Sprott; M. Phillips

doi:10.1103/PhysRevLett.43.36

Experimental study of axisymmetric instability of inverse-dee and square tokamak equilibria

B. Lipschultz, S. C. Prager, T. H. Osborne, J. C. Sprott, M. Phillips

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Abstract

Inverse-dee- and square-shaped equilibria are observed by experimentally mapping the magnetic-flux plot as a function of time in a tokamak with a 4-null poloidal divertor. Inverse-dee equilibria are observed to be unstable to the vertical magnetohydrodynamic axisymmetric instability on a time scale ∼1000 poloidal Alfvén times. Square equilibria are stable on the time scale available for observation. Instability growth is apparently slowed by field-shaping hoop and wall passive stabilization.

Original language	English (US)
Pages (from-to)	36-39
Number of pages	4
Journal	Physical review letters
Volume	43
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.43.36
State	Published - 1979

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.43.36

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abstract = "Inverse-dee- and square-shaped equilibria are observed by experimentally mapping the magnetic-flux plot as a function of time in a tokamak with a 4-null poloidal divertor. Inverse-dee equilibria are observed to be unstable to the vertical magnetohydrodynamic axisymmetric instability on a time scale ∼1000 poloidal Alfv{\'e}n times. Square equilibria are stable on the time scale available for observation. Instability growth is apparently slowed by field-shaping hoop and wall passive stabilization.",

author = "B. Lipschultz and Prager, \{S. C.\} and Osborne, \{T. H.\} and Sprott, \{J. C.\} and M. Phillips",

year = "1979",

doi = "10.1103/PhysRevLett.43.36",

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journal = "Physical review letters",

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AU - Lipschultz, B.

AU - Prager, S. C.

AU - Osborne, T. H.

AU - Sprott, J. C.

AU - Phillips, M.

PY - 1979

Y1 - 1979

N2 - Inverse-dee- and square-shaped equilibria are observed by experimentally mapping the magnetic-flux plot as a function of time in a tokamak with a 4-null poloidal divertor. Inverse-dee equilibria are observed to be unstable to the vertical magnetohydrodynamic axisymmetric instability on a time scale ∼1000 poloidal Alfvén times. Square equilibria are stable on the time scale available for observation. Instability growth is apparently slowed by field-shaping hoop and wall passive stabilization.

AB - Inverse-dee- and square-shaped equilibria are observed by experimentally mapping the magnetic-flux plot as a function of time in a tokamak with a 4-null poloidal divertor. Inverse-dee equilibria are observed to be unstable to the vertical magnetohydrodynamic axisymmetric instability on a time scale ∼1000 poloidal Alfvén times. Square equilibria are stable on the time scale available for observation. Instability growth is apparently slowed by field-shaping hoop and wall passive stabilization.

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EP - 39

JO - Physical review letters

JF - Physical review letters

IS - 1

ER -

Experimental study of axisymmetric instability of inverse-dee and square tokamak equilibria

Abstract

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