We investigate magnetized bow shock formation in strongly radiatively cooled collisional plasma flows using the 3D resistive MHD code GORGON. We simulate bow shocks from the interaction of supersonic, super-Alfvénic plasma, generated during the ablation phase of an inverse z-pinch array, with dielectric blunt obstacles. Mass ablation from the wire array produces radially diverging, highly collisional (λii < < a), β~0.1 upstream flows with frozen-in magnetic flux (Rem > > 1). Obstacles mimic B-dot probes and are aligned to measure the advected azimuthal magnetic field. Bow shock shape is modified by flux pile-up at the probe; so opening angle and stand-off distance vary with the angle between the shock and the magnetic field - thus, these shocks exhibit a 3D structure. We investigate the effect of probe size and strong radiative cooling on shock structure and the post-shock magnetic field measured by the probe. Numerical results are benchmarked against experiments performed at the MAGPIE facility (1.4MA, 250ns), and are used to predict bow shock structure at the Z Pulsed Power facility (Sandia National Labs; 30MA, 300ns), for the MARZ (Magnetically Ablated Reconnection on Z) Z fundamental science program.SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
APS Division of Plasma Physics Meeting Abstracts
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