Microfocusing options for sector 3 of the Advanced Photon Source upgrade project

Synchrotron radiation from third generation, high-brilliance rings is an ideal source for x-ray microbeams. The aim of this report is to describe a micofocusing scheme that combines both a toroidal mirror and a Kirkpatrick-Baez (KB) mirrors for upgrading the existing optical system for inelastic x-ray scattering experiments at sector 3 at the Advanced photon Source (APS). Shadow ray tracing simulations show that this combination can provide beam sizes of 4.5 $\mu $m (H) $\times $ 0.6 $\mu $m (V) (FWHM) at the end of the existing D-station (66 m from the source) with a transmission of up to 59 {\%} and a beam size of 3.7 $\mu $m (H) $\times $ 0.46 $\mu $m (V) (FWHM) at the front end of proposed E-station (68 m from the source) with a transmission of up to 57 {\%}. With this new setup, experiments that combine high pressure, low temperature and external magnetic field can be done.