Variable linear polarization from an X-ray undulator

摘要: A new X-ray undulator has been designed and constructed which produces linearly polarized X-rays in the plane of polarization can be oriented to a user selectable angle, from horizontal vertical. Based on Apple-II elliptically polarizing (EPU), rotates angle linear by simple longitudinal motion magnets. Combined with circular elliptical capabilities EPU operating standard mode, this soft radiation versatile control. This paper describes magnetic structure device presents an analysis field varying parameters. The variable capability is then exhibited measuring absorption spectrum polytetrafluoroethylene thin film. experiment, measures dichroism sample at two peaks near C 1s edge, demonstrates continuous rotation undulator.