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PRISM (Polarized Radiation Imaging and Spectroscopy Mission) was proposed toESA in response to the Call for White Papers for the definition of the L2 andL3 Missions in the ESA Science Programme. PRISM would have two instruments: (1)an imager with a 3.5m mirror (cooled to 4K for high performance in thefar-infrared---that is, in the Wien part of the CMB blackbody spectrum), and(2) an Fourier Transform Spectrometer (FTS) somewhat like the COBE FIRASinstrument but over three orders of magnitude more sensitive. Highlights of thenew science (beyond the obvious target of B-modes from gravity waves generatedduring inflation) made possible by these two instruments working in tandeminclude: (1) the ultimate galaxy cluster survey gathering 10e6 clustersextending to large redshift and measuring their peculiar velocities andtemperatures (through the kSZ effect and relativistic corrections to theclassic y-distortion spectrum, respectively) (2) a detailed investigation intothe nature of the cosmic infrared background (CIB) consisting of at presentunresolved dusty high-z galaxies, where most of the star formation in theuniverse took place, (3) searching for distortions from the perfect CMBblackbody spectrum, which will probe a large number of otherwise inaccessibleeffects (e.g., energy release through decaying dark matter, the primordialpower spectrum on very small scales where measurements today are impossible dueto erasure from Silk damping and contamination from non-linear cascading ofpower from larger length scales). These are but a few of the highlights of thenew science that will be made possible with PRISM.

PRISM (Polarized Radiation Imaging and Spectroscopy Mission): A White  Paper on the Ultimate Polarimetric Spectro-Imaging of the Microwave and  Far-Infrared Sky