Pressure Gradient Effects On Two-Dimensional Plasma Expansion
R. F. Smith (Verfasser/in), J. R. Hunter (Verfasser/in), J. Dunn (Verfasser/in), J. Nilsen (Verfasser/in), S. Moon (Verfasser/in), V. N. Shlyaptsev (Verfasser/in), R. Keenan (Verfasser/in), J. Filevich (Verfasser/in), J. J. Rocca (Verfasser/in), M. C. Marconi (Verfasser/in), Lawrence Livermore National Laboratory (Rechercheur), United States Department of Energy (Sponsor/in), United States Department of Energy Office of Scientific and Technical Information (Lieferant)
Recent advances in interferometry has allowed for the characterization of the electron density expansion within a laser produced plasma to within 10 {micro}m of the target surface and over picosecond timescales. This technique employs the high brightness output of the transient gain Ni-like Pd collisional x-ray laser at 14.7 nm to construct an effective moving picture of the two-dimensional (2-D) expansion of the plasma. We present experimentally measured density profiles of an expanding Al plasma generated through laser irradiation in a 14mm line focus geometry. Significant lateral expansion was observed at all times as well as a pronounced on-axis electron density dip. Detailed modeling with a 2-D plasma physics code gives good agreement to experimental observations. Large pressure gradients associated with the tight focal spot conditions are calculated to dominate in shaping the plasma density profile
E-Book, English, 2004
United States. Dept. of Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, Washington, D.C., Oak Ridge, Tenn., 2004