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In this experiment, we measure ion temperature evolution of collisionalplasma shocks and colliding supersonic plasma flows across a range of species(Ar, Kr, Xe, N), Mach numbers, and collisionalities. Shocks are formed via thecollision of discrete plasma jets relevant to plasma-jet-drivenmagneto-inertial fusion (PJMIF). We observe nearly classical ion shock heatingand ion-electron equilibration, with peak temperatures attained consistent withcollisional shock heating. We also observe cases where this heating occurs in asmooth merged structure with reduced density gradients due to significantintepenetration of the plasma jets. In application to PJMIF liners, we findthat Mach number degradation due to ion shock heating will likely not besignificant at the typical full-scale conditions proposed, and that a degree ofinterpenetration may be an attractive condition for PJMIF and similarapproaches which seek to form uniform merged structures from discretesupersonic plasma jets.

Experimental Study of Ion Heating in Obliquely Merging Hypersonic Plasma Jets