COSINE-200 is the next phase of the ongoing COSINE-100 experiment. The main purpose of the experiment is the performance of an unambiguous verification of the annual modulation signals observed by the DAMA experiment. The success of the experiment critically depends on the production of a 200 kg array of ultra-pure NaI(Tl) crystal detectors that have lower backgrounds than the DAMA crystals. The purification of raw powder is the initial but important step toward the production of ultra-pure NaI(Tl) detectors. We have already demonstrated that fractional recrystallization from water solutions is an effective method for the removal of the problematic K and Pb elements. For the mass production of purified powder, a clean facility for the fractional recrystallization had been constructed at the Institute for Basic Science (IBS), Korea. Here, we report the design of the purification process, material recovery, and performance of the NaI powder purification facility.
Performance of an ultra-pure NaI(Tl) detector produced by an indigenously-developed purification method and crystal growth for the COSINE-200 experiment
Validation of the COSINE-100U NaI(Tl) Encapsulation for Low-Temperature Operation in Liquid Scintillator
Institute for Basic Science (IBS)（基础科学研究院）；Chung-Ang University（中央大学）；University of Science and Technology (UST)（科学技术大学）；Jeju National University（济州国立大学）；Kyungpook National University（庆北国立大学）
Development and Initial Performance of an Upgraded NaI(Tl) Crystal Encapsulation for COSINE-100U
Kyungpook National University（庆北国立大学）；Chung-Ang University（中央大学）；Institute for Basic Science（基础科学研究院）；University of Science and Technology（科学技术大学）；Seoul National University（首尔国立大学）；Jeju National University（济州国立大学）；Carnegie Mellon University（卡内基梅隆大学）
ANAIS（用NaI（Tl）闪烁体进行年度调制）实验的目的是在Canfranc地下实验室（LSC）使用相同的目标和技术确认DAMA/LIBRA信号。将使用250公斤超纯NaI（Tl）晶体作为靶，分成20个模块，每个模块质量为12.5公斤，并与两个来自Hamamatsu的高效光电倍增管耦合。LSC的ANAIS-25装置由两个原型组成，总量为25 kg NaI（Tl），由钾含量低于我们分析技术极限的粉末生长而成，并安装在LSC的方便屏蔽中。背景已经仔细分析，主要结果将在本文中总结，重点是在原型和相关的背景贡献中确定的α污染。此外，还将修订ANAIS实验目标的实现状况和ANAIS-250实验建设的前景。
