title: A seven-crystal Johann-type hard x-ray spectrometer at the Stanford Synchrotron Radiation Lightsource.
abstract: We present a multicrystal Johann-type hard x-ray spectrometer (~5-18 keV) recently developed, installed, and operated at the Stanford Synchrotron Radiation Lightsource. The instrument is set at the wiggler beamline 6-2 equipped with two liquid nitrogen cooled monochromators--Si(111) and Si(311)--as well as collimating and focusing optics. The spectrometer consists of seven spherically bent crystal analyzers placed on intersecting vertical Rowland circles of 1 m of diameter. The spectrometer is scanned vertically capturing an extended backscattering Bragg angular range (88°-74°) while maintaining all crystals on the Rowland circle trace. The instrument operates in atmospheric pressure by means of a helium bag and when all the seven crystals are used (100 mm of projected diameter each), has a solid angle of about 0.45% of 4π sr. The typical resolving power is in the order of E/ΔE ~ 10,000. The spectrometer's high detection efficiency combined with the beamline 6-2 characteristics permits routine studies of x-ray emission, high energy resolution fluorescence detected x-ray absorption and resonant inelastic x-ray scattering of very diluted samples as well as implementation of demanding in situ environments.
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA. dsokaras@slac.stanford.edu
authors.forename: D
authors.initials: D
authors.lastname: Sokaras
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authors.lastname: Weng
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authors.lastname: Nordlund
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authors.lastname: Alonso-Mori
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authors.lastname: Velikov
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authors.lastname: Wenger
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authors.lastname: Garachtchenko
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authors.lastname: George
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authors.lastname: Borzenets
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authors.lastname: Johnson
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authors.lastname: Rabedeau
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authors.lastname: Bergmann