  In the double-cone ignition (DCI) inertial confinement fusion scheme, head-on
collision of high density plasma jets is one of the most distinguished feature
when compared with other schemes. However, the application of traditional
hydrodynamic simulation methods become limited. To overcome such limitations,
we propose a new simulation method for large-scale high density plasmas. This
method takes advantages of modern particle-in-cell simulation techniques and
binary Monte Carlo collisions, including both long-range collective
electromagnetic fields and short-range particle-particle interactions.
Especially, in this method, the restrictions of simulation grid size and time
step, which usually appear in a fully kinetic description, are eliminated. In
addition, collisional coupling and state-dependent coefficients are also
removed in this method. The correctness and robustness of the new simulation
method are verified, by comparing with fully kinetic simulations at small
scales and purely hydrodynamic simulations at large scale. Following the
conceptual design of the DCI scheme, the colliding process of two plasma jets
with initial density of 100 g/cc, initial thermal temperature of 70 eV, and
counter-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 colliding
kinetic energy to thermal energy, are obtained. These values agree with the
recent experimental measurements at a reasonable range.
