Updates to Geant4 Simulations for TIGERISS
POSTER
Abstract
The Trans-Iron Galactic Element Recorder for the International Space Station (TIGERISS) is an ultra-heavy galactic cosmic ray (UHGCR) detector planned for installation at the Columbus SOX location of the International Space Station (ISS) in 2027. TIGERISS improves on previous instruments by using silicon strip detectors (SSDs) to achieve greater linearity in signal response over an expanded dynamic range from 5B to 82Pb
and silicon photomultipliers (SiPMs) for a more compact readout profile and to avoid the need for high voltage. Geant4 is used to predict instrument performance, such as energy ranges and geometry factors. We present top-of-instrument energy thresholds for aerogel and acrylic Cherenkov detectors as a function of charge and angle. Previous simulations were for a 9x10 SSD geometry, while the current proposed detector has a 9x9 geometry, which requires new simulations to understand the geometry factor. Additional work focuses on creating a simulated data set to model expected results after launch.
*This work has been supported by NASA Astrophysics Pioneers Program cooperative agreement 80NSSC22M0299. TIGERISS has been supported at Washington University in St. Louis by a grant from the Peggy and Steve Fossett Foundation and by the McDonnell Center for the Space Sciences. TIGERISS builds on work under NASA grants for CALET(NNX11AE02G, NNX16AC02G, and 80NSSC20K0399) and SuperTIGER (NNX15AC23G and 80NSSC20K0405). We thank the NASA Columbia Scientific Balloon Facility, the NASA Balloon Program Office, and the NSF United States Antarctic Program for the 55-day long-duration balloon flight for SuperTIGER-1, the 32-day SuperTIGER-2.3 flight, and the successful recovery efforts,which provided scientific and technical background for TIGERISS. The material contained in this document is based upon work supported by a National Aeronautics and Space Administration (NASA) grant or cooperative agreement. Any opinions, findings,conclusions, or recommendations expressed in this material are those of the author and do not necessarily reflect the views of NASA.
Presenters
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William A Labrador
- Washington University in St. Louis