Pressure Gradient Effects On Two-Dimensional Plasma Expansion
R. F. Smith (Autor), J. R. Hunter (Autor), J. Dunn (Autor), J. Nilsen (Autor), S. Moon (Autor), V. N. Shlyaptsev (Autor), R. Keenan (Autor), J. Filevich (Autor), J. J. Rocca (Autor), M. C. Marconi (Autor), Lawrence Livermore National Laboratory (Investigador), United States Department of Energy (Patrocinador), United States Department of Energy Office of Scientific and Technical Information (Distribuidor)
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
Libro-e, 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