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Abstract: Dual-phase xenon time projection chambers (TPCs) are the forerunners of direct detection dark matter searches and have achieved unprecedented sensitivities for a large range of WIMP dark matter mass. With three different ton-scale xenon experiments recently commissioned across the globe, more progress can be anticipated in the coming years. At Lawrence Livermore National Laboratory, we strive to expand the sensitivity of dual-phase xenon detector technology by exploring interactions both below and above the conventional WIMP search energy region of interest. In this talk, I will discuss our efforts to calibrate the liquid xenon response to nuclear recoils down to the sub-keV region and up to the hundreds of keV energy region to enable new dark matter searches. I will also present our current understanding of the various background pathologies of these unconventional regimes along with their mitigation strategies.
Biography: Jingke Xu is a staff physicist at Lawrence Livermore National Laboratory, with a research focus on dark matter search and neutrino detection. Jingke graduated from the University of Science and Technology of China with a Bachelor of Science’s degree in 2008, and received his PhD in 2013 from Princeton University, where he worked on the Borexino solar neutrino project and the DarkSide dark matter experiment. After graduation, he worked on the SABRE dark matter initiative to test the longstanding DAMA/LIBRA dark matter claim as a postdoc at Princeton. In 2015, he moved to LLNL to work on the LUX/LZ dark matter experiments, and became a staff physicist at LLNL in 2017. In 2019, Jingke was awarded the DOE Early Career Award by the Office of Science to study the low-energy sensitivity of xenon-based dark matter experiments.
Online Meeting Room:
https://cern.zoom.us/j/67825588893?pwd=Z2krZTNIWGxkdU9uUFF5Nzc1bU44UT09
（Meeting ID: 678 2558 8893 Passcode: 128135）