A dual-channel, curved-crystal spectrograph for petawatt laser, x-ray backlighter source studies
- Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States)
- Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550-9234 (United States)
- Department of Applied Sciences, University of California, Davis, Davis, California 95616 (United States)
- General Atomics, San Diego, California 92186 (United States)
- College of Mathematical and Physical Sciences, Ohio State University, Columbus, Ohio 43210 (United States)
A dual-channel, curved-crystal spectrograph was designed to measure time-integrated x-ray spectra in the {approx}1.5 to 2 keV range (6.2-8.2 A wavelength) from small-mass, thin-foil targets irradiated by the VULCAN petawatt laser focused up to 4x10{sup 20} W/cm{sup 2}. The spectrograph consists of two cylindrically curved potassium-acid-phthalate crystals bent in the meridional plane to increase the spectral range by a factor of {approx}10 compared to a flat crystal. The device acquires single-shot x-ray spectra with good signal-to-background ratios in the hard x-ray background environment of petawatt laser-plasma interactions. The peak spectral energies of the aluminum He{sub {alpha}} and Ly{sub {alpha}} resonance lines were {approx}1.8 and {approx}1.0 mJ/eV sr ({approx}0.4 and 0.25 J/A sr), respectively, for 220 J, 10 ps laser irradiation.
- OSTI ID:
- 22051016
- Journal Information:
- Review of Scientific Instruments, Vol. 80, Issue 8; Other Information: (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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