Speaker
Description
The Micro-Computed Tomography (MCT) beamline is one of the first two beamlines to be constructed at the Australian Synchrotron as part of the BR–GHT program. This new beamline will be operational for user experiments by mid-2021. A report on the current status of the MCT project will be provided. MCT will complement the existing X-ray tomography capability provided by the Imaging & Medical Beamline (IMBL), targeting applications requiring higher (sub-micron) spatial resolution, with commensurately smaller field-of-view.
MCT is currently in the procurement phase, with particular emphasis being placed on the photon-delivery system (PDS). The key X-ray optical element in the PDS will be a double-multilayer monochromator (DMM). Detailed calculations related to the design of the DMM will be discussed, including important aspects which inform the possible choices for the multilayer stripes. The operational X-ray energy range (8 to 40 keV) and bandpass requirements for different imaging (including phase-contrast) modalities need to be considered. However, an appropriate choice of multilayer stripes also needs to be guided by practical issues such as: thermal and radiation-hardness properties of the materials involved; reducing surface roughness and thereby increasing reflectivity; reducing overall thickness to relieve possible stress and deformation; having grazing-incidence angles which are not so small that the mirror lengths and/or their separation become prohibitively large.
