Experimental Study of Axisymmetric Instability of Inverse-Dee and Square
B. Lipschultz, S. C. Prager, T. H. Osborne, J.
C. Sprott, and M. Phillips
University of Wisconsin, Madison,
(Received 21 November 1978)
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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