Spatially resolved EUV emission from focused REB discharges into thin targets
The EUV emission from 10- to 100-mg/cm/sup 2/-thick planar targets (Z=6--79) exposed to 60-nsec-duration focused relativistic electron beams was examined at current densities of 0.4--1.0 MA/cm/sup 2/. Spatially resolved spectra were obtained with a stigmatic near-normal incidence spectrograph, in the wavelength range 500--2100 A, along axial and radial directions. Time-resolved EUV data were obtained with windowless photoelectric diodes operated unfiltered and filtered with 0.5-..mu..m-thick aluminum. The axial views show copious emission from the diode gap associated with late-time impedance collapse. Radial views show continuum radiation which is emitted from the region of the target exposed to the focused REB and line radiation which originates from a lower-density (approximately 10/sup 19/ cm/sup -3/) more-extended late-time plasma resulting from foil expansion. The region of the foil exposed to the focused REB radiates as a blackbody source with a peak temperature of 2--6 eV. These temperatures are a factor of 2 below the calculated temperatures for classical deposition in the foils exposed to the focused beam assuming no hydrodynamic foil expansion.
- Research Organization:
- Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375
- OSTI ID:
- 5174069
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 49:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BEAM-PLASMA SYSTEMS
PLASMA DIAGNOSTICS
ULTRAVIOLET SPECTRA
ELECTRON BEAMS
ELECTRON DENSITY
EMISSION SPECTRA
ENERGY ABSORPTION
ENERGY-LEVEL TRANSITIONS
FOCUSING
FOILS
PINCH EFFECT
PLASMA DENSITY
PLASMA HEATING
RELATIVISTIC RANGE
STARK EFFECT
ABSORPTION
BEAMS
ENERGY RANGE
HEATING
LEPTON BEAMS
PARTICLE BEAMS
SPECTRA
700102* - Fusion Energy- Plasma Research- Diagnostics