We developed an instrument design capable of measuring linear X-ray polarization over a broad-band using
conventional spectroscopic optics, using a method previously described by Marshall (2008) involving laterally
graded, multilayer-coated flat mirrors. We present possible science investigations with such an instrument and
two possible configurations. This instrument could be used in a small orbiting mission or scaled up for the
International X-ray Observatory. Laboratory work has begun that would demonstrate the capabilities of key
components.
Multilayer-coated optics can strongly polarize X-rays and are central to a new design of a broad-band, soft X-ray
polarimeter. We have begun laboratory work to verify the performance of components that could be used in
future soft X-ray polarimetric instrumentation. We have reconfigured a 17 meter beamline facility, originally
developed for testing transmission gratings for Chandra, to include a polarized X-ray source, an X-ray-dispersing
transmission grating, and a multilayer-coated optic that illuminates a CCD detector. The X-rays produced from
a Manson Model 5, multi-anode source are polarized by a multilayer-coated flat mirror. The current configuration
allows for a 180 degree rotation of the source in order to rotate the direction of polarization. We will present
progress in source characterization and system modulation measurements as well as null and robustness tests.
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