The Status of the Heavy Ion Telescope on the ISS/JEM-EF

Abstract

JAXA has operated the heavy ion telescope located on the ISS/JEM-EF since 2009, and prepared for the publication of data. Due to the long-term operation, there are concerns over the degradation of its silicon sensors and circuits. The calibration operations were conducted in May 2012 and August 2016. We checked for such deterioration but have not yet to confirm the degree of degradation. For the correct determination of atomic number and incident energy, a more accurate calculation method was examined and then applied. As a result, a good correlation with CREME96 was confirmed.