The Trans-Iron Galactic Element Recorder for the International Space Station (TIGERISS) Instrument
Trans-Iron Galactic Element Recorder for the International Space Station) is a natural evolution to space of the balloon-borne TIGER and SuperTIGER instruments discussed elsewhere at this conference. TIGERISS will be proposed to the next NASA Pioneers opportunity, anticipated in March 2022, as an ISS-attached mission to extend measurements of the relative abundances of galactic cosmic-ray nuclei to the Pt-Pb region with individual element resolution and excellent statistical precision. TIGERISS is designed to be able to accurately determine the atomic number of incident nuclei to beyond the end of the periodic table and to begin measurements as low as $_2$He, in order to measure the velocity distributions of the more common species using its Cherenkov detectors. TIGERISS measures the atomic number of incident nuclei by both the differential ionization energy loss (dE/dX) vs. Cherenkov (velocity) technique and the Cherenkov vs. Cherenkov technique using acrylic and silica-aerogel Cherenkov detectors as in TIGER and SuperTIGER. However, it utilizes silicon strip detectors (SSD) for dE/dX and trajectory measurements, replacing the plastic scintillators and scintillating optical fiber (SOFi) hodoscopes of TIGER and SuperTIGER. The scientific goals and anticipated results of TIGERISS are discussed in accompanying papers at this conference. Here we give the details of the TIGERISS measurement technique and its technical implementation.
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