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P: Plasmaphysik
P 14: Schwerionen- und lasererzeugte Plasmen 1
P 14.3: Talk
Tuesday, March 28, 2006, 15:15–15:30, 1004
Studies of Skind Layer Accelerated Plasma Blocks — •Jan Badziak1, Heinrich Hora2, and Jie Zhang3 — 1Inst. Plasma Phys. and Laser Microfusion, Warsaw — 2Theor. Physics, Univ. NSW, Sydney, Australia — 3Inst.Physics, Chinese Academ. Sci., Beijing
The ignition of deuterium-tritium fuel at densities at or above the solid state for very high energy gain controlled reactions is one of the options to be explored with the new PW-ps laser techniques of fast ignition (FI). Based on ion emission from solids with TW-ps laser pulses, the skin layer acceleration (SLA) by the nonlinear (ponderomotive) force was discovered ∖1∖ under the conditions that very clean laser pulses with a suppression of prepulses by a factor 108 (contrast ratio) were applied. This resulted in ion current densities in the space charge neutral blocks exceeding 10^11 Amps/cm^2. Similar observations from x-ray emission ∖2∖ could be explained in the same way that the clean pulses avoided the otherwise usual relativistic self-focusing while TW-ps laser pulses from the Schaefer method automatically demonstrated the SLA mechanism with relativistic self focusing ∖3∖] as seen from the nonlinear force acceleration of the generated plasma. Latest results on these developments are presented. ∖1∖ H. Hora, J. Badziak et al Opt. Comm. 207, 333 (2002); J. Badziak, H. Hora et al, Phys. Letters, A315, 452 (2003); ∖2∖ P. Zhang et al, E57, 3746 (1998); ∖3∖ R. Sauerbrey, Phys. Plasma 3, 4712 (1996)