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An in-vacuum diffractometer for resonant elastic soft x-ray scattering. 2011

D G Hawthorn, and F He, and L Venema, and H Davis, and A J Achkar, and J Zhang, and R Sutarto, and H Wadati, and A Radi, and T Wilson, and G Wright, and K M Shen, and J Geck, and H Zhang, and V Novák, and G A Sawatzky
Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.

We describe the design, construction, and performance of a 4-circle in-vacuum diffractometer for resonant elastic soft x-ray scattering. The diffractometer, installed on the resonant elastic and inelastic x-ray scattering beamline at the Canadian Light Source, includes 9 in-vacuum motions driven by in-vacuum stepper motors and operates in ultra-high vacuum at base pressure of 2 × 10(-10) Torr. Cooling to a base temperature of 18 K is provided with a closed-cycle cryostat. The diffractometer includes a choice of 3 photon detectors: a photodiode, a channeltron, and a 2D sensitive channelplate detector. Along with variable slit and filter options, these detectors are suitable for studying a wide range of phenomena having both weak and strong diffraction signals. Example measurements of diffraction and reflectivity in Nd-doped (La,Sr)(2)CuO(4) and thin film (Ga,Mn)As are shown.

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