Speaker
Description
COSINE-100 is a WIMP dark matter search experiment using ultra low-background NaI(Tl) crystals as a goal to revisit DAMA/LIBRA experiment. COSINE-100 is running with a 106 kg array of low-background NaI(Tl) crystals with approximately 3 counts/kg/day/keV, which is about three times higher than DAMA/LIBRA’s crystals. For the unambiguous conclusion of the DAMA/LIBRA's observation, it is essential to have lower background crystals at least at the level of the DAMA/LIBRA crystals. The Center for Underground Physics (CUP) has been growing low-background NaI(Tl) crystals since 2018 for COSINE-200, and succeeded to produce low-background Tl-doped crystals. We also developed crystal machining, polishing, and detector assembly techniques as well. Home-made detectors were tested at the Yangyang underground laboratory.
In this presentation, the CUP-grown crystals and their performance will be discussed.
