Radiation losses from high Z, 10. 6. mu. m laser-irradiated microballoons

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · Phys. Fluids; (United States)

OSTI ID:5258917

Rockett, P D; Priedhorsky, W C; Giovanielli, D V

The radiation emitted from CO/sub 2/ laser-irradiated (lambda = 10.6 ..mu..m), gold-coated microballoons has been measured absolutely in the photon energy range from 30 eV to 6 keV. Incident laser intensity varied from 1.6 x 10/sup 14/ W/cm/sup 2/ to 9.5 x 10/sup 15/ W/cm/sup 2/ with a 1 nsec FWHM pulse. Multi-channel x- ray diode data were statistically tested against assumed spectral forms, finding the best parameter fit corresponding to the minimum variance, chi square. The spectra were established to be blackbody with color temperatures ranging from 66 to 134 eV and with the fraction of incident energy radiated decreasing from 15% to 2.3% as laser intensity was increased across the above- mentioned range. Associated diagnostics confirmed these results. An analytical model is presented in which radiated emission from hot electron energy deposition is calculated. The calculations agree well with the measured data.

• Research Organization: University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5258917
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 25:7; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
AIRSHIPS
BALLOONS
CARBON DIOXIDE LASERS
COATINGS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
GAS LASERS
GOLD
IONIZING RADIATIONS
KEV RANGE
KEV RANGE 01-10
LASER-PRODUCED PLASMA
LASERS
METALS
PLASMA
PLASMA DIAGNOSTICS
PLASMA SIMULATION
PULSES
RADIATIONS
SIMULATION
TRANSITION ELEMENTS
X RADIATION