SETTING UP EXPERIMENTS WITH LASER PLASMA CLOUDS TO SIMULATE THE GENERATION OF QUASI-SPHERICAL COLLISIONLESS SHOCK WAVES IN COSMIC PLASMA, BASED ON CALCULATIONS BY THE PARTICLE (ION) METHOD USING A HYBRID MODEL

Abstract

The given paper is devoted to the calculations (by Hybrid model of Vshivkov and Dudnikova) for solving the problem of laboratory simulative experiment on the generation of quasi-spherical Collisionless Shock in magnetized Background Plasma (BP), by injection into BP a spherical Laser-Produced Cloud (LPC), at the large-scale KI-1 facility of ILP, with the CO₂-laser (1 kJ energy, at length 10 mm)  vacuum chamber (Æ120 cm and  length L = 5 m), supplied by BP-source for producing background with the density up to n_* ~ 10¹⁴ см^-3 in the region with Æ ~100 см and length L_* up to 2 ¸ 3 м in the middle of chamber. Preliminary data of simulation for the collisionless MLM-interaction between LPC and BP, show that such Shock could generate only if the LPC-energy E₀ should be risen up from its today level (25 J) to the new need one - 40¸50 J. For this required level of E₀, the BP-density n_*-compressions in Shock are 1,7 (at angle 90⁰ relative to magnetic field B₀) and 1,3 (at angle 45⁰), while the relevant front velocity (Alfven-Mach ones) of shocks for these directions would be more different, as M_Af ≈ 7 and M_Af ≈ 2¸3. Therefore, in such conditions we could study more in details, the role of curl electric E_j-field (generated due to magnetic field B₀ exclusion) for the Magnetic Laminar Model (MLM) of the collisionless interaction between LPC and BP.

Key words: Laser-produced and background plasmas, magnetic field, collisionless interaction, spherical shocks, simulation of plasma waves in space, KI-1 facility, pulsed CO2-lasers.