Absolute measurements of x-ray backlighter sources at energies above 10 keV

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3582134· OSTI ID:21537907

Maddox, B R; Park, H S; Remington, B A; Chen, C; Chen, S; Prisbrey, S T ^[1]; Comley, A ^[2]; Back, C A ^[3]; Szabo, C; Seely, J F ^[4]; Feldman, U ^[5]; Hudson, L T; Seltzer, S ^[6]; Haugh, M J; Ali, Z ^[7]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Atomic Weapons Establishment, Aldermasten, Reading RG7 4PR (United Kingdom)
3. General Atomics, San Diego, California 92121 (United States)
4. Naval Research Laboratory, Washington D.C. 20375 (United States)
5. ARTEP Inc., Ellicott City, Maryland 21042 (United States)
6. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
7. NSTEC, Livermore, California 94550 (United States)

Line emission and broadband x-ray sources with x-ray energies above 10 keV have been investigated using a range of calibrated x-ray detectors for use as x-ray backlighters in high energy density (HED) experiments. The conversion efficiency of short- and long-pulse driven Mo and Ag line-emission backlighters at 17 and 22 keV was measured to investigate the crossover region between short- and long-pulse conversion efficiency. It was found that significant 17 and 22 keV line emissions were observed using a 3 {omega}, 1 ns long-pulse drive for Mo and Ag targets and a comparison between the measured Mo x-ray spectrum and calculations using an atomic physics code suggests that the line emission is due to thermal emission from N-like Mo atoms. Electron temperatures derived from fits to the continuum region of the x-ray spectra agree well with the T{sub hot} scaling as 100x(I{lambda}{sup 2}){sup 1/3}. The continuum emissions from empty and 1 atm Kr-filled imploded CH shell targets were also measured for the use as broadband backlighters.

• OSTI ID: 21537907
• Journal Information: Physics of Plasmas, Vol. 18, Issue 5; Other Information: DOI: 10.1063/1.3582134; (c) 2011 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONVERSION
EFFICIENCY
ELECTRON TEMPERATURE
EMISSION
EMISSION SPECTRA
ENERGY DENSITY
PLASMA DIAGNOSTICS
X-RAY SOURCES
X-RAY SPECTRA
RADIATION SOURCES
SPECTRA