Simulations of nozzle gas flow and gas-puff Z-pinch implosions on the Weizmann Z-pinch

被引:0
|
作者
Tangri, V. [1 ]
Queller, T. [2 ]
Kroupp, E. [2 ]
Dasgupta, A. [1 ]
Rosenzweig, G. [2 ,4 ]
Giuliani, J. L. [3 ]
Maron, Y. [2 ]
机构
[1] Naval Res Lab, Plasma Phys Div, Washington, DC 20375 USA
[2] Weizmann Inst Sci, Fac Phys, IL-7610001 Rehovot, Israel
[3] Naval Res Lab, NRL Voluntary Emeritus Program, Plasma Phys Div, Washington, DC 20375 USA
[4] MKS Instruments, Wilmington, MA 01887 USA
关键词
RAYLEIGH-TAYLOR INSTABILITY; MODELING ASSESSMENT; X-RAY;
D O I
10.1063/5.0202237
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We present simulations of an oxygen gas puff Z-pinch on a University scale generator at the Weizmann Institute of Science. The work accounts for the detailed geometry of the nozzle, the initial neutral gas density distribution, and the subsequent implosion. The modeling results show significant improvement with data for the current at the time of stagnation in comparison with a previous effort [Rosenzweig et al., Phys. Plasmas 27, 022705 (2020)]. As a first step, we performed simulations of the flow of neutral diatomic oxygen from a plenum through a nozzle within a recessed cathode, across a gap, and into the anode with a recessed grounded honeycomb. These simulations show an agreement with the measured initial gas density profiles within the region not blocked by the recesses and accessible to visible measurements. The computed neutral gas flow profile serves as the initial condition for a radiation magnetohydrodynamic simulation of the implosion using the MACH2-TCRE code. By considering the specific details of the nozzle and chamber geometry, we find agreement with the measured current profile, including the inductive notch. The simulations predict that the plasma undergoes a strong pinch within the hidden anode recess. The simulations also predict the strongest radiation pulse occurs within the anode recess and at the time of the observed inductive notch.
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页数:9
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