X radiation of a plasma produced by picosecond ruby laser pulses

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:6825282

Blazhenkov, V V; Kirkin, A N; Kotenko, L P; Leontovich, A M; Merzon, G I; Mozharovskii, A M; Chernyakov, A L; Chuzo, A N

We have investigated the continuous x rays emitted from a plasma arising on interaction of picosecond ruby laser pulses with massive targets of 20 different materials from Be to Bi. The laser flux density at the target surface was up to approx.10/sup 14/ W/cm/sup 2/ with pulse length 10--20 psec and energy approx.0.5 J. Absorption curves for the x rays were measured for cutoff energies E/sub c/=4--60 keV. The electron temperature of the plasma was determined on the basis of the continuous x rays in the region E/sub c/=4--8 keV and also on the basis of the x-ray line spectra. For all targets in the flux density range >10/sup 13/ W/cm/sup 2/ in the region E/sub c/approx. =10 keV an inflection was observed in the x-ray absorption curve, corresponding to deviation of the electron velocity distribution function from Maxwellian. The effective temperature of the suprathermal electrons for various targets amounted to 2--6 keV and in individual laser pulses reached 15 keV. Measurement of the angular distribution of the suprathermal x rays in the target plane showed that it is isotropic for normal incidence of a linearly polarized laser beam on the target.

• Research Organization: P. N. Lebedev Physics Institute, USSR Academy of Sciences
• OSTI ID: 6825282
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 51:4; ISSN SPHJA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
BERYLLIUM
BISMUTH
DATA
DISTRIBUTION
DISTRIBUTION FUNCTIONS
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONS
INFORMATION
IONIZING RADIATIONS
LASER-PRODUCED PLASMA
LASERS
METALS
NUMERICAL DATA
PLASMA
PULSES
RADIATIONS
RUBY LASERS
SOLID STATE LASERS
SPECTRA
X RADIATION
X-RAY SPECTRA