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We report on the development of the thallium-doped cesium iodide (CsI:Tl)calorimeter subsystem for the All-Sky Medium-Energy Gamma-ray Observatory(AMEGO) [1]. The CsI:Tl calorimeter is one of the three main subsystems thatcomprise the AMEGO instrument suite; the others include the double-sidedsilicon strip detector (DSSD) tracker/converter and a cadmium zinc telluride(CZT) calorimeter. Similar to the LAT instrument on Fermi Gamma-ray SpaceTelescope, the hodoscopic calorimeter consists of orthogonally layered CsI:Tlbars. Unlike the LAT, which uses PIN photodiodes, the scintillation light fromeach end of the CsI:Tl bar is read out with recently developed large-areasilicon photomultiplier (SiPM) arrays. Development of the calorimetertechnology for a large space-based {\gamma}-ray observatory is being done viafunding from the NASA APRA program. Under this program, we have designed, builtand are currently testing a prototype consisting of 24 CsI:Tl bars (each withdimensions of 16.7 mm x 16.7 mm x 100 mm) hodoscopically arranged in fourlayers with six bars per layer. The ends of each bar are read out with SensLArrayJ quad SiPMs. Signal readout and processing is done with the IDEAS SIPHRA(IDE3380) ASIC. Performance testing of this prototype was done with laboratorysources and at an initial beam test; future testing and characterization willbe done during a second beam test (2019) and a balloon flight (2020) inconjunction with the other subsystems led by NASA-GSFC. We will discuss theinitial calibration tests, construction of the prototypes and the mostup-to-date results from laboratory and beam tests with analog/digitalelectronics and the SIPHRA DAQ.

Development of a CsI:Tl calorimeter subsystem for the All-Sky Medium-Energy Gamma-Ray Observatory (AMEGO)