The materials science and Laue diffraction beamlines at the European Synchrotron Radiation Facility

Abstract

This article presents the design of two diffraction beamlines, BL2 and BL3, at the European Synchrotron Radiation Facility. The materials science beamline will produce a monochromatic beam tunable in the energy range 5<E<60 keV and provide an energy resolution of 10−4 < ΔE/E < 3 × 10−4 below ∼40 keV. The radiation is generated by a 24 pole wiggler with critical energy εc = 28.8 keV and K=14.0. It produces 4.9 kW of power over a horizontal fan of 1.5 mrad. The heat load on the first monochromator crystal is controlled by an adaptive premirror set to reflect an energy band exceeding the desired monochromator energy by 20% or by low energy absorbing filters. The first monochromator crystal will be cryogenically cooled. The premirror and a symmetric postmirror will collimate and refocus in the vertical plane. Horizontal focusing will be done by sagittal bending of a rib enforced second monochromator crystal. The white beam station BL3 is optimized for Laue diffraction in the energy range 5<E <60 keV. The source is a 44 pole wiggler with εc = 17.2 keV and K=4.7. It produces a power of 1.8 kW and an integrated flux ∼ 6 × 1017 ph/s. over a horizontal fan of 0.5 mrad. The radiation is focused by a toroidal mirror with fixed sagittal radius.