Building on several Antarctic balloon flights, the Cosmic Ray Energetics And Mass (CREAM) instrument was installed on the ISS on August 22 2017. CREAM has been successfully measuring and identifying cosmic rays in the multi-TeV (10^12 eV) energy range and in a mass range from protons to iron nuclei, as shown in Fig. 1. This provides the needed clues to unravel the century old mystery of the origin of cosmic rays. Initially ISS-CREAM operated outside of the South Atlantic Anomaly (SAA) exclusively, to avoid potential damage to instrument systems due to increased radiation. Following careful testing to characterize the impact of the SAA, ISS-CREAM now collects data 24 hours per day.

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UMD