Fast ions and hot electrons in the laser–plasma interaction

• S. J. Gitomer

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

• R. D. Jones

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

• F. Begay

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

• A. W. Ehler

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

• J. F. Kephart

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

• R. Kristal

  University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

抄録

Data on the emission of energetic ions produced in laser–matter interactions have been analyzed for a wide variety of laser wavelengths, energies, and pulse lengths. Strong correlation has been found between the bulk energy per AMU for fast ions measured by charge cups and the x-ray-determined hot electron temperature. Five theoretical models have been used to explain this correlation. The models include (1) a steady-state spherically symmetric fluid model with classical electron heat conduction, (2) a steady-state spherically symmetric fluid model with flux limited electron heat conduction, (3) a simple analytic model of an isothermal rarefaction followed by a free expansion, (4) the lasnex hydrodynamics code [Comments Plasma Phys. Controlled Fusion 2, 85 (1975)], calculations employing a spherical expansion and simple initial conditions, and (5) the lasnex code with its full array of absorption, transport, and emission physics. The results obtained with these models are in good agreement with the experiments and indicate that the detailed shape of the correlation curve between mean fast ion energy and hot electron temperature is due to target surface impurities at the higher temperatures (higher laser intensities) and to the expansion of bulk target material at the lower temperatures (lower laser intensities).

収録刊行物

• The Physics of Fluids

  The Physics of Fluids 29 (8), 2679-2688, 1986-08-01

  AIP Publishing

キーワード

• General Engineering

詳細情報

• CRID: 1361137044707379072
• NII論文ID: 80003127495
• DOI: 10.1063/1.865510
• ISSN: 00319171
• Web Site: https://pubs.aip.org/aip/pfl/article-pdf/29/8/2679/12477284/2679_1_online.pdf
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