Time-resolved soft-x-ray studies of energy transport in layered and planar laser-driven targets
New low-energy x-ray diagnostic techniques are used to explore energy-transport processes in laser heated plasmas. Streak cameras are used to provide 15-psec time-resolution measurements of subkeV x-ray emission. A very thin (50 ..mu..g/cm/sup 2/) carbon substrate provides a low-energy x-ray transparent window to the transmission photocathode of this soft x-ray streak camera. Active differential vacuum pumping of the instrument is required. The use of high-sensitivity, low secondary-electron energy-spread CsI photocathodes in x-ray streak cameras is also described. Significant increases in sensitivity with only a small and intermittant decrease in dynamic range were observed. These coherent, complementary advances in subkeV, time-resolved x-ray diagnostic capability are applied to energy-transport investigations of 1.06-..mu..m laser plasmas. Both solid disk targets of a variety of Z's as well as Be-on-Al layered-disk targets were irradiated with 700-psec laser pulses of selected intensity between 3 x 10/sup 14/ W/cm/sup 2/ and 1 x 10/sup 15/ W/cm/sup 2/.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5184208
- Report Number(s):
- UCRL-53271; ON: DE82017289; TRN: 82-014479
- Resource Relation:
- Other Information: Thesis. Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LASER-PRODUCED PLASMA
X-RAY SPECTRA
PLASMA DIAGNOSTICS
CESIUM IODIDES
LASER TARGETS
SOFT X RADIATION
STREAK PHOTOGRAPHY
ALKALI METAL COMPOUNDS
CESIUM COMPOUNDS
ELECTROMAGNETIC RADIATION
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
IONIZING RADIATIONS
PHOSPHORS
PHOTOGRAPHY
PLASMA
RADIATIONS
SPECTRA
TARGETS
X RADIATION
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