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Measurements of Cosmic Microwave Background (CMB) anisotropy have served asthe best experimental probe of the early universe to date. The inflationaryparadigm, inspired in part by the extreme isotropy of the CMB, is now acornerstone in modern cosmology. Inflation has passed a series of rigorousexperimental tests, but we still do not understand the physical mechanism orenergy scale behind inflation. A general prediction of inflation and one thatcan provide certain insights into inflationary physics is a background ofprimordial gravitational waves. These perturbations leave a distinct signaturein the CMB B-modes of polarization. The EPIC (Experimental Probe ofInflationary Cosmology) study team has investigated several CMB polarizationmission concepts to carry out a definitive measurement of the inflationaryB-mode polarization spectrum. In this report we study a mission with anaperture intermediate between the two missions discussed in our previousreport. EPIC-IM's increased aperture allows access to a broader science casethan the small EPIC-Low Cost mission. In addition to the search forinflationary gravitational waves, the increase aperture allows us to mine thescale polarization and lensing shear polarization signals down to cosmologicallimits, so that we extract virtually all the cosmological information availablefrom the CMB. In addition, a modest number of channels operating at higherfrequencies allows for an all-sky measurement of polarized Galactic dust, whichwill provide a rich dataset for Galactic science related to magnetic fields.Using a combination of a large sensitivity focal plane with a new opticaldesign, and an efficient 4K mechanical cooler, EPIC-IM realizes highersensitivity than EPIC-Comprehensive Science mission.

Study of the Experimental Probe of Inflationary Cosmology (EPIC)-Intemediate Mission for NASA's Einstein Inflation Probe