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The annual modulation signal observed by the DAMA experiment is along-standing question in the community of dark matter direct detection. Thisnecessitates an independent verification of its existence using the samedetection technique. The COSINE-100 experiment has been operating with 106~kgof low-background NaI(Tl) detectors providing interesting checks on the DAMAsignal. However, due to higher backgrounds in the NaI(Tl) crystals used inCOSINE-100 relative to those used for DAMA, it was difficult to reach finalconclusions. Since the start of COSINE-100 data taking in 2016, we also haveinitiated a program to develop ultra-pure NaI(Tl) crystals for COSINE-200, thenext phase of the experiment. The program includes efforts of raw powderpurification, ultra-pure NaI(Tl) crystal growth, and detector assemblytechniques. After extensive research and development of NaI(Tl) crystal growth,we have successfully grown a few small-size (0.61$-$0.78 kg) thallium-dopedcrystals with high radio-purity. A high light yield has been achieved byimprovements of our detector assembly technique. Here we report the ultra-pureNaI(Tl) detector developments at the Institute for Basic Science, Korea. Thetechnique developed here will be applied to the production of NaI(Tl) detectorsfor the COSINE-200 experiment.

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment