Laser plasma simulations of the generation processes of Alfven and collisionless shock waves in space plasma

Generation of Alfven waves propagating along external magnetic field B0 and Collisionless Shock Waves propagating across B0 are studied in experiments with laser- produced plasma and magnetized background plasma. The collisionless interaction of interpenetrating plasma flows takes place through a so-called Magnetic Laminar Mechanism (MLM) or Larmor Coupling. At the edge of diamagnetic cavity LP-ions produce induction electric field E which accelerates BP-ions while LP-ions rotate in opposite direction. The ions movement generates sheared azimuthal magnetic field B which could launches torsional Alfven wave. In previous experiments at KI-1 large scale facility a generation of strong perturbations propagating across B0 with magnetosonic speed has been studied at a moderate value of interaction parameter δ~0.3. In the present work we report on experiments at conditions of 5~R2 and large Alfven-Mach number MA~10 in which strong transverse perturbations traveling at a scale of ~1 m in background plasma at a density of ~3*1013 cm-3 is observed. At the same conditions but smaller MA ~ 2 a generation, the structure and dynamic of Alfven wave with wavelength ~0.5 m propagating along fields B0~100÷500 G for a distance of ~2.5 m is studied.