On stabilization of gas puff implosion: experiment and simulation

A double gas puff was used to study the mitigation of the magneto-Rayleigh-Taylor (RT) instabilities for long implosion times (up to 250 ns). The experiments have been performed on the inductive storage GIT-4 (1.7 MA, 120 ns) generator. Current division between the outer and inner shells was control...

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Bibliographic Details
Published in:IEEE transactions on plasma science 1998-08, Vol.26 (4), p.1259-1266
Main Authors: Baksht, R.B., Fedunin, A.V., Labetsky, A.Yu, Russkikh, A.G., Shishlov, A.V., Diyankov, O.V., Glazyrin, I.V., Koshelev, S.V.
Format: Article
Language:English
Subjects:
Argon
Capacitors
Physics
Plasma
Plasma density
Plasma measurements
Plasma simulation
Plasma sources
Plasma stability
Plasma waves
Plasma x-ray sources
Radiation
Two dimensional displays
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Summary:A double gas puff was used to study the mitigation of the magneto-Rayleigh-Taylor (RT) instabilities for long implosion times (up to 250 ns). The experiments have been performed on the inductive storage GIT-4 (1.7 MA, 120 ns) generator. Current division between the outer and inner shells was controlled using magnetron-discharge preionization. The implosion of the a double gas puff, with the improved preionization, results in the formation of a uniform plasma column. The results of two-dimensional (2-D) radiation-magnetohydrodynamic simulations support the experimental results: a double gas puff implosion mitigates the RT instabilities, leading to the development of only small-amplitude waves. The 2-D simulation allowed us to explain the halo effect seen in the experiments: the use of the low hybrid conductivity in the calculation demonstrated the existence of the high density plasma core surrounded by a low density plasma halo.
ISSN:0093-3813
1939-9375
DOI:10.1109/27.725158