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The characteristic of the lateral interaction of two plasma plumes in $Ar$background gas at high pressures was reported in recent publication [Yadav {\itet. al.}, J. Phys. D: Appl. Phys. {\bf 50}, 053421 (2017)]. Further we haveinvestigated the interaction characteristics of plumes in $He$, $Ne$, $Ar$ and$Xe$ background gases to see the effect of mass on the interaction. The presentwork illustrate the applicability of the present model for theoreticalunderstanding of dynamics, structure, density variation, shock wave formationsand their interactions of two propagating plasma plumes in a wide range ofambient conditions. The formation of interaction region, geometrical shape andstrength of the shock fronts and subsequent regular and Mach reflections inaccordance with the nature and pressure of ambient gas are successfullycaptured in the simulations. The observed results are supported by the reportedexperimental observations under identical conditions.

Numerical study of the effect of mass of the background gas on the lateral interactions of two plasma plumes at high pressure