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We describe a new implementation of a broad-band soft X-ray polarimeter,substantially based on a previous design. This implementation, the Pioneer SoftX-ray Polarimeter (PiSoX) is a SmallSat, designed for NASA's call forAstrophysics Pioneers, small missions that could be CubeSats, balloonexperiments, or SmallSats. As in the REDSoX Polarimeter, the gratingarrangement is designed optimally for the purpose of polarimetry withbroad-band focussing optics by matching the dispersion of the spectrometerchannels to laterally graded multilayers (LGMLs). The system can achievepolarization modulation factors over 90%. For PiSoX, the optics are lightweightSi mirrors in a one-bounce parabolic configuration. High efficiency, blazedgratings from opposite sectors are oriented to disperse to a LGML forming achannel covering the wavelength range from 35 to 75 Angstroms (165 - 350 eV).Upon satellite rotation, the intensities of the dispersed spectra, afterreflection and polarizing by the LGMLs, give the three Stokes parameters neededto determine a source's linear polarization fraction and orientation. Thedesign can be extended to higher energies as LGMLs are developed further. Wedescribe examples of the potential scientific return from instruments based onthis design.

A Small Satellite Version of a Broad-band Soft X-ray Polarimeter