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In the double-cone ignition (DCI) inertial confinement fusion scheme, head-oncollision of high density plasma jets is one of the most distinguished featurewhen compared with other schemes. However, the application of traditionalhydrodynamic simulation methods become limited. To overcome such limitations,we propose a new simulation method for large-scale high density plasmas. Thismethod takes advantages of modern particle-in-cell simulation techniques andbinary Monte Carlo collisions, including both long-range collectiveelectromagnetic fields and short-range particle-particle interactions.Especially, in this method, the restrictions of simulation grid size and timestep, which usually appear in a fully kinetic description, are eliminated. Inaddition, collisional coupling and state-dependent coefficients are alsoremoved in this method. The correctness and robustness of the new simulationmethod are verified, by comparing with fully kinetic simulations at smallscales and purely hydrodynamic simulations at large scale. Following theconceptual design of the DCI scheme, the colliding process of two plasma jetswith initial density of 100 g/cc, initial thermal temperature of 70 eV, andcounter-propagating velocity at 300 km/s is investigated using this new method.Quantitative values, including density increment, increased plasma temperature,confinement time at stagnation and conversion efficiency from the collidingkinetic energy to thermal energy, are obtained. These values agree with therecent experimental measurements at a reasonable range.

Head-on collision of large-scale high density plasmas jets: a first-principle kinetic simulation approach