Laser irradiation of disk targets at 0. 53. mu. m wavelength

Conference · Mon Jan 26 04:00:00 EST 1981

OSTI ID:6590209

Mead, W C; Campbell, E M; Estabrook, K G

We present results and analysis for laser-irradiations of Be, CH, Ti, and Au disk targets with 0.53 ..mu..m light in 3 to 35 J, 600 ps pulses, at nominal intensities from 3 x 10/sup 13/ to approx. 4 x 10/sup 15/ W/cm/sup 2/. The measured absorptions are higher than observed in similar 1.06 ..mu..m irradiations, and are largely consistent with modeling which shows the importance of inverse bremsstrahlung and Brillouin scattering. Observed red-shifted back-reflected light shows that Brillouin is operating at low to moderate levels. The measured fluxes of multi-keV x-rays indicate low hot-electron fractions, with temperatures which are consistent with resonance absorption. Measurements show efficient conversion of absorbed light into sub-keV x-rays, with time-, angular-, and spatial-emission distributions which are generally consistent with non-LTE modeling using inhibited thermal electron transport.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6590209
• Report Number(s): UCRL-84684(Rev.1); CONF-8009132-1(Rev.1); CONF-801119-3(Rev.1)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABSORPTION
ALKALINE EARTH METALS
BERYLLIUM
BREMSSTRAHLUNG
BRILLOUIN EFFECT
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
ELEMENTS
GOLD
LASER TARGETS
METALS
RADIATIONS
RESONANCE ABSORPTION
SCATTERING
SPECTRA
TARGETS
TITANIUM
TRANSITION ELEMENTS
X-RAY SPECTRA