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While the energy density of the Cosmic X-ray Background (CXB) provides astatistical estimate of the super massive black hole (SMBH) growth and massdensity in the Universe, the lack, so far, of focusing instrument in the 20-60keV (where the CXB energy density peaks), frustrates our effort to obtain acomprehensive picture of the SMBH evolutionary properties. HEXIT-SAT (HighEnergy X-ray Imaging Telescope SATellite) is a mission concept capable ofexploring the hard X-ray sky with focusing/imaging instrumentation, to obtainan unbiased census of accreting SMBH up to the redshifts where galaxy formationpeaks, and on extremely wide luminosity ranges. This will represent a leapforward comparable to that achieved in the soft X-rays by the EinsteinObservatory in the late 70'. In addition to accreting SMBH, and very much likethe Einstein Observatory, this mission would also have the capabilities ofinvestigating almost any type of the celestial X-ray sources. HEXIT-SAT isbased on high throughput (>400 cm2 @ 30 keV; >1200 cm2 @ 1 keV), high quality(15 arcsec Half Power Diameter) multi-layer optics, coupled with focal planedetectors with high efficiency in the full 0.5-70keV range. Building on theBeppoSAX experience, a low-Earth, equatorial orbit, will assure a low andstable particle background, and thus an extremely good sensitivity for fainthard X-ray sources. At the flux limits of 1/10 microCrab (10-30 keV) and 1/3microCrab (20-40 keV) (reachable in one Msec observation) we should detect ~100and ~40 sources in the 15 arcmin FWHM Field of View respectively, thusresolving >80% and ~65% of the CXB where its energy density peaks.Comment: to appear in Proceeedings of SPIE Vol. 5488, UV to Gamma Ray Space  Telescope System

HEXIT-SAT: a mission concept for x-ray grazing incidence telescopes from 0.5 to 70 keV