Journal of Synchrotron Radiation

Volume 15, Part 1 (January 2008)

research papers

J. Synchrotron Rad. (2008). 15, 50-54 [ doi:10.1107/S0909049507055884 ]

Cost-effective upgrade of a focusing system for inelastic X-ray scattering experiments under high pressure

C.-Y. Huang, Y. Q. Cai, N. Hiraoka, C.-C. Chen, S.-C. Chung, Y.-F. Song and K.-L. Tsang

Abstract: Inelastic X-ray scattering (IXS) is a powerful technique capable of probing the dynamic behavior and electronic structure of materials. For IXS experiments under high pressure up to the megabar range using state-of-the-art diamond-anvil-cell technology, the sample volume is limited to the order of 1 × 10^-3 mm³ for which a beam focus of the same order and less is often required. In this paper a scheme utilizing a set of low-cost and compact Kirkpatrick-Baez mirrors for upgrading the existing optical system of the Taiwan IXS beamline at SPring-8 is described. The scheme as implemented improves the focus to 13 µm × 16 µm (horizontal × vertical) with a transmission of up to 72% and a flux density gain of over 30 times, which has enhanced substantially the efficiency of the beamline for high-pressure research.

Keywords: Kirkpatrick-Baez mirrors; inelastic X-ray scattering; diamond-anvil cell.