Title :
The X-ray radiation from cathode spot fragments in laser-induced vacuum discharges
Author_Institution :
Dept. of Phys., Opt. Spectrosc., & Molecule Phys., Tech. Univ. Chemnitz, Germany
fDate :
8/1/1999 12:00:00 AM
Abstract :
The temporal evolution of X-ray emission of laser-induced discharges was investigated by means of a picosecond X-ray streak camera. Point-like structures with small divergence and thin hot layers of intense X-ray radiation with life time from 30 ps to 1.5 ns in a spectral range 100 eV-10 keV have been found in a comparatively low voltage vacuum discharge (U≈150 V-2.7 kV) initiated by picosecond laser beam. The radiation of laser induced breakdown was investigated just after breakdown as well as with a delay time (up to 20 ns) relative to the ignition point by the laser beam in order to eliminate the X-ray radiation coming from the laser-produced plasma
Keywords :
X-ray applications; X-ray production; plasma diagnostics; plasma production by laser; plasma temperature; streak photography; vacuum arcs; 100 eV to 10 keV; 150 V to 2.7 kV; 20 ns; 30 ps to 1.5 ns; X-ray emission; X-ray radiation lifetime; cathode spot fragments; delay time; divergence; ignition point; intense X-ray radiation; laser induced breakdown radiation; laser-induced vacuum discharges; laser-produced plasma; low voltage vacuum discharge; picosecond X-ray streak camera; picosecond laser beam induced discharge; point-like structures; spectral range; temporal evolution; thin hot layers; time evolution; vacuum arcs; Cameras; Cathodes; Delay effects; Electric breakdown; Ignition; Laser beams; Low voltage; Particle beams; Plasma x-ray sources; X-ray lasers;
Journal_Title :
Plasma Science, IEEE Transactions on
