Measurements of energetic electron distributions in uv and ir laser plasmas. [0. 35 AND 1. 05. mu. M; 5 X 10/sup 13/ to 2 x 10/sup 15/ W/cm/sup 2/]
Measurements have been made of the x-ray continuum produced by plasmas irradiated with 0.35 and 1.05 ..mu..m laser light over an intensity range of 5 x 10/sup 13/ to 2 x 10/sup 15/ W/cm/sup 2/. From the x-ray continuum, which was measured over a range of 1.5 to 300 keV, both the temperature of and fractional energy in any supra-thermal electron distributions can be obtained. The measurements show the presence of a very high temperature (20 to 60 keV) electron distribution with either 0.35 or 1.05 ..mu..m irradiation. This component, which is attributed to the presence of the two-plasmon decay instability, is observed above an intensity of approximately 10/sup 14/ W/cm/sup 2/ at 1.05 ..mu..m and contains less than 0.1% of the incident laser energy. With 0.35 ..mu..m irradiation, the intensity at which this component is observed is approximately a factor of 3 higher. At 1.05 ..mu..m, this very high temperature component appears in addition to a third, 2 to 7 keV, component attributed to resonance absorption. 38 refs., 37 figs., 6 tabs.
- Research Organization:
- Rochester Univ., NY (USA)
- DOE Contract Number:
- AC08-80DP40124
- OSTI ID:
- 6283438
- Report Number(s):
- DOE/DP/40124-76; ON: DE86004199
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LASER-PRODUCED PLASMA
ENERGY LOSSES
PLASMA INSTABILITY
RESONANCE ABSORPTION
X-RAY SPECTRA
COMPUTERIZED SIMULATION
ELECTRON TEMPERATURE
EXPERIMENTAL DATA
INFRARED RADIATION
LEAST SQUARE FIT
NAI DETECTORS
NEODYMIUM LASERS
OMEGA FACILITY
RESPONSE FUNCTIONS
SI SEMICONDUCTOR DETECTORS
THEORETICAL DATA
ULTRAVIOLET RADIATION
X-RAY DETECTION
X-RAY FLUORESCENCE ANALYZERS
ABSORPTION
DATA
DETECTION
ELECTROMAGNETIC RADIATION
FUNCTIONS
INFORMATION
INSTABILITY
LASERS
LOSSES
MAXIMUM-LIKELIHOOD FIT
MEASURING INSTRUMENTS
NUMERICAL DATA
NUMERICAL SOLUTION
PLASMA
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
SCINTILLATION COUNTERS
SEMICONDUCTOR DETECTORS
SIMULATION
SOLID SCINTILLATION DETECTORS
SOLID STATE LASERS
SPECTRA
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