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Proceedings Paper

Plasma block acceleration by ps-TW laser irradiation
Author(s): George H. Miley; Frederick Osman; Heinrich Hora; Jan Badziak; Karel Rohlena; Karel Jungwirth; Jerzy Wolowski; Y. Cang; X. He; Jie Zhang; Peter X. Hammerling
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Paper Abstract

Plasma emission or ablation from laser-irradiated targets shows very complicated properties. One novelty was observed at irradiation of neodymium glass laser pulses of ps duration and TW power if there was a very strong suppression of prepulses by a contrast ratio of about 108 until 100 ps before the main pulse arrived. The emitted ion maximum energy was more than 50 times below the values observed in all the comparable numerous experiments. The other anomaly is that the number of the fast ions did not change when the laser intensity varied by a factor 30. This permitted a separation of the usual effects of self-focusing and permitted an analysis fully based on simplified plane geometry as a skin layer interaction mechanism. The consequence is that plasma blocks are accelerated by the nonlinear (ponderomotive) force with ion current densities above 1010 A/cm2. This provides basically new aspects for laser fusion using uncompressed solid DT fuel and a new kind of x-ray laser process may be possible.

Paper Details

Date Published: 20 September 2004
PDF: 14 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.546798
Show Author Affiliations
George H. Miley, Univ. of Illinois/Urbana-Champaign (United States)
Frederick Osman, Univ. of Western Sydney (Australia)
Heinrich Hora, Univ. New South Wales (Australia)
Jan Badziak, Institute of Plasma Physics and Laser Microfusion (Poland)
Karel Rohlena, Institute of Physics (Czech Republic)
Karel Jungwirth, Institute of Physics (Czech Republic)
Jerzy Wolowski, Institute of Plasma Physics and Laser Microfusion (Poland)
Y. Cang, Institute of Physics (China)
X. He, Institute of Applied Physics and Computational Mathematics (China)
Jie Zhang, Institute of Physics (China)
Peter X. Hammerling, Quantum Resonance, Inc. (United States)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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