Supression of three-particle recombination in intersecting laser-plasma bunches

Three-particle ion-electron recombination in beryllium laser plasma intersecting similar plasma bunch is theoretically and experimentally investigated. The paper is aimed at studying the influence of two plasma bunch interaction on recombination intensity and the yield of multicharged ions. To produce intersecting plasma flares two neodimium laser radiation beams (1-5 J, 50 ns, 1011 Wxcm-2) were focused in one case on two mutually perpendicular plane targets, in the other - on two points of one target with d=2...20 mm spacing. Radiation in Be2+ (2p-3d, 67.5 nm) and Be3+(2-3, 41 nm) ion lines was registered by vacuum monochromator. The recombination intensity 6 cm distant from the target is detected to be strongly decreased. Considerable increase (2-3 times) of ion mean charge was simultaneously detected. To explain the detected effect numerical experiments on the basis of hydrodynamic quasi-two-dimensional two-temperature laser plasma model are carried out. The calculations show that the main cause of attenuation of ternary recombination intensity and increase of mean ion charge in intersecting laser-plasma bunches is electron heating up due to their friction with another bunch ions