Author: Afshar, N.
Paper Title Page
Nanoprobe Beamline Stability Optimization at the Australian Synchrotron  
  • M. Semeraro, N. Afshar, C.M. Kewish
    AS - ANSTO, Clayton, Australia
  • B. Mountford
    ASCo, Clayton, Victoria, Australia
  • M.D. de Jonge
    ANSTO, Menai, New South Wales, Australia
  The Nanoprobe beamline is one of the most technically challenging beamlines within the Australian Synchrotron ANSTO BRIGHT program. The Nanoprobe will host a suite of x-ray mapping capabilities at spatial resolutions down to 60 nanometres. This extreme resolution target requires an overall length of over 100 m entailing high stability for optical components. The first part of the beamline will be sitting on the main building floor and will include two mirrors, two monochromators (DMM and DCM), a Secondary Source Aperture, plus all ancillary components. The end station will be situated in a satellite building, connected to the main building by a tunnel hosting the 50m UHV beam transfer pipe. The end station will host a pair of KB mirrors, the sample stages, multiple detectors and several beam inspection devices. There are several mechanical challenges that need to be overcome in the realisation of the beamline. Within the main building, we need to ensure the mechanical stability of the mirrors, the monochromators and the secondary source aperture. To reduce the vibration impact on the vertical displacement, we have opted for an all-horizontally deflecting optical scheme. Separated and isolated slabs are required, as well as mechanical isolation of vibration sources from the optical components. Thermal stability requirements are also challenging. Fundamental height above floor level requires thermal stability better than 0.05 C under the mirrors. Careful attention to materials selection and design is required for the end station to contain thermal drifts. Achieving these stabilities requires a careful approach as conventional HVAC systems bring vibration and air turbulence. This paper describes the design strategies adopted to optimize beamline components stability.  
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