Experimental Study of Axisymmetric Instability of Inverse-Dee and Square
Tokamak Equilibria
B. Lipschultz, S. C. Prager, T. H. Osborne, J.
C. Sprott, and M. Phillips
University of Wisconsin, Madison,
Wisconsin 53706
(Received 21 November 1978)
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 Alfven 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.
Ref: B. Lipschultz, S. C. Prager, T. H. Osborne, J.
C. Sprott, and M. Phillips, Phys. Rev. Lett. 43, 36-39 (1979)
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