Octupole End Station for Soft X-Ray Scattering in Magnetic Dichroism (XMD)

This Octupole End Station is the third-generation design with substantial improvements that is used for soft Xray scattering in magnetic dichroism (XMD) experiments. The system is mainly used for three applications: constant field for the duration of an x-ray absorption scan, point-by-point field reversal for an XMD photon energy scan, and hysteresis loop measurements. The ADC Octupole is based on earlier designs and work performed by Elke Arenholz and Soren O. Prestemon at Advanced Light Source, Lawrence Berkeley National Laboratory1. ADC improved on the ALS design by enlarging the chamber to allow for in vacuum goniometer and a significant increase in the number of ports that can be used for experimental design, such as cryogenic cooling. Eight conical electro magnets are equidistantly spaced about the surface of a sphere to create an omnidirectional field vector with a magnitude of 1 [T].