HP-Ge Crystal Growth at USD for Developing Ge detectors in Searching for Rare-Event Physics*

Detector grade High-Purity Germanium(HP-Ge) crystals are largely needed for rare event physics. At the University of South Dakota (USD), we have successfully built a production chain that can purify the commercially available Ge raw materials, grow detector-grade HP-Ge crystals, and fabricated them into Ge detectors. Zone refining and crystal growth are the two important steps to obtain HP-Ge crystals. A well-controlled segregation method is used to control the distribution of impurities during crystal growth. A summary of our current progress and inventory of detector grade crystals, including all the USD detectors made by USD crystals will be reported.