Title :
On stabilization of gas puff implosion: experiment and simulation
Author :
Baksht, Rina B. ; Fedunin, Anatoliy V. ; Labetsky, Aleksey Yu ; Russkikh, Alexander G. ; Shishlov, Alexander V. ; Diyankov, Oleg V. ; Glazyrin, Igor V. ; Koshelev, Serge V.
Author_Institution :
Inst. of High Current Electron., Tomsk, Russia
fDate :
8/1/1998 12:00:00 AM
Abstract :
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
Keywords :
Rayleigh-Taylor instability; Z pinch; plasma instability; plasma magnetohydrodynamics; plasma simulation; preionisation; 1.7 MA; current division; experiment; gas puff implosion; halo effect; high density plasma core; inductive storage GIT-4 generator; long implosion times; low density plasma halo; low hybrid conductivity; magneto-Rayleigh-Taylor instabilities; magnetron-discharge preionization; simulation; two-dimensional radiation-magnetohydrodynamic simulations; uniform plasma column; Argon; Capacitors; Plasma density; Plasma measurements; Plasma simulation; Plasma sources; Plasma stability; Plasma waves; Plasma x-ray sources; Two dimensional displays;
Journal_Title :
Plasma Science, IEEE Transactions on
