ON STABILIZATION OF GAS PUFF IMPLOSION - EXPERIMENT AND SIMULATION

A double gas puff was used to study the mitigation of the magneto-Rayl eigh-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 inne r shells was controled using magnetron-discharge preionization. The im plosion of the a double gas puff, with the improved preionization, res ults in the formation of a uniform plasma column. The results of two-d imensional (2-D) radiation-magnetohydrodynamic simulations support the experimental results: a double gas puff implosion mitigates the RT in stabilities, 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.