May 24 – 28, 2021
America/Vancouver timezone

Mass production of large-area lithium-drifted silicon detectors for the GAPS silicon tracker

May 26, 2021, 5:00 AM
Poster Experiments: Space and particle astrophysics Posters: Particle Astrophysics and Space


Masayoshi Kozai (JAXA)


Unprecedented mass-production of large-area lithium-drifted silicon (Si(Li)) detectors has been performed for the General Antiparticle Spectrometer (GAPS). GAPS is the first experiment optimized for low-energy cosmic antinuclei. The first long-duration Antarctic balloon flight is scheduled for late 2022. A large-volume silicon tracker plays an essential role in the novel GAPS detection technique, which is based on exotic atom physics. The Si(Li) detectors developed for GAPS feature a large (10 cm) diameter, 2.5 mm thickness with $>$90% sensitive layer, and excellent energy resolution ($<$4 keV for 60 keV X-rays) at relatively high operating temperature ($\sim-$40C). We established a fabrication method and produced $>$1000 detectors with a yield rate of $\sim$90%. Analysis of the fabrication and performance data provide valuable insights into the production methods for such large-area Si(Li) detectors. We report on the results of the mass production of GAPS Si(Li) detectors.

TIPP2020 abstract resubmission? No, this is an entirely new submission.

Primary authors

Masayoshi Kozai (JAXA) Kakeru Tokunaga (JAXA) Hideyuki Fuke (JAXA) Tyler Erjavec (MIT) Charles J. Hailey (Columbia University) Chihiro Kato (Shinshu University) Norman Madden (Columbia University) Kazuoki Munakata (Shinshu University) Kerstin Perez (MIT) Field Rogers (Massachusetts Institute of Technology) Nathan Saffold (Columbia University) Yuki Shimizu (Kanagawa University) Mengjiao Xiao (Massachusetts Institute of Technology)

Presentation materials