Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session C16: Liquid Xenon Dark Matter II |
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Sponsoring Units: DPF Chair: Kate scholberg, Duke University Room: 251D |
Saturday, April 16, 2016 1:30PM - 1:42PM |
C16.00001: Results from the XENON100 Dark Matter Direct Search Experiment Qing Lin The XENON100 detector, located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, has been taking dark matter data since 2008. Thanks to its large sensitive volume and very low background, XENON100 has achieved some of the best sensitivity in the field. In this talk we present the results of the latest scientific run with XENON100. Preliminary results from the combined exposure of all the scientific data accumulated by XENON100, using a refined analysis, will also be presented. [Preview Abstract] |
Saturday, April 16, 2016 1:42PM - 1:54PM |
C16.00002: Search for Periodic Rate Variations in XENON100 and Comparison with DAMA/LIBRA Annual Modulation Patrick de Perio The stability of the XENON100 detector and electronic recoil event rate in the (2-6) keV energy range was studied for ~1 live-year of dark matter search data taken between February, 2011 and January, 2014. An un-binned profile likelihood analysis is used to identify potential periodic signatures in the electronic recoil data. The results of these studies and a comparison with the DAMA/LIBRA annual modulation will be presented. [Preview Abstract] |
Saturday, April 16, 2016 1:54PM - 2:06PM |
C16.00003: The XENON1T Cryogenic Commissioning Performance Yun Zhang The XENON1T experiment, located at the Laboratori Nazionali del Gran Sasso in Italy, aims at detecting dark matter weakly interacting massive particles using a dual-phase (liquid/gas) xenon time projection chamber filled with 3300kg of liquid xenon. The experiment is currently in the commissioning phase for science data taking in early 2016. The cryogenic system of the experiment maintains the liquid xenon target at a stable temperature and allows high speed continuous xenon purification through the use of efficient heat exchangers. The cryogenic commissioning tests performed so far have validated the efficiency and reliability of the cryogenic system for continuous long term operations. In this talk we will summarize the XENON1T cryogenic system and present results from cryogenic commissioning performance tests. [Preview Abstract] |
Saturday, April 16, 2016 2:06PM - 2:18PM |
C16.00004: ABSTRACT WITHDRAWN |
Saturday, April 16, 2016 2:18PM - 2:30PM |
C16.00005: The LUX-Zeplin Dark Matter Detector Jeremy Mock The LUX-ZEPLIN (LZ) detector is a second generation dark matter experiment that will operate at the 4850 foot level of the Sanford Underground Research Experiment as a follow-up to the LUX detector, currently the world’s most sensitive WIMP direct detection experiment. The LZ detector will contain 7 tonnes of active liquid xenon with a 5.6 tonne fiducial mass in the TPC. The TPC is surrounded by an active, instrumented, liquid-xenon “skin” region to veto gammas, then a layer of liquid scintillator to veto neutrons, all contained within a water shield. Modeling the detector is key to understanding the expected background, which in turn leads to a better understanding of the projected sensitivity, currently expected to be 2e-48 cm$^2$ for a 50 GeV WIMP. I will discuss the current status of the LZ experiment as well as its projected sensitivity. [Preview Abstract] |
Saturday, April 16, 2016 2:30PM - 2:42PM |
C16.00006: Low Background Assay Results for LZ Kelsey Oliver-Mallory, Keenan Thomas The next generation dark matter experiment LUX-ZEPLIN (LZ) requires careful control of intrinsic radioactivity in all critical detector components in order to reach its unprecedented target sensitivity to Weakly Interacting Massive Particles (WIMPs): $2 \times 10^{-48}$ $cm^2$ at $50$ $ \frac{GeV}{c^2}$. Appropriate material selection is essential to meeting this goal, and an extensive campaign of low background screening is currently being carried out using assay devices at the Sanford Underground Research Facility and the Boulby Underground Laboratory. We will present results from this work, including measurements for the Ti cryostat, PMT bases, PMT raw materials, PTFE, and other components. [Preview Abstract] |
Saturday, April 16, 2016 2:42PM - 2:54PM |
C16.00007: D-D Neutron Generator Calibrations and Hardware in the LUX-ZEPLIN Dark Matter Search Experiment Will Taylor The LUX-ZEPLIN (LZ) dark matter search experiment will be a two-phase liquid/gas xenon time projection chamber with 7 tonnes of active liquid xenon (LXe) located at the 4850 ft level of the Sanford Underground Research Facility in Lead, SD. LZ will utilize an in-situ, absolute calibration of nuclear recoils (NR) in LXe using mono-energetic 2.45 MeV neutrons produced by a D-D neutron generator. This technique was used in the LUX detector to measured the NR charge yield in LXe ($Q_{y}$) to 0.7 keV recoil energy and the NR light yield in LXe ($L_{y}$) to recoil energies of 1.1 keV - both of which were the lowest energy measurements achieved in the field. These absolute, ultra-low energy calibrations of the NR signal yields in LXe provide clear measurements of the detector response used for the WIMP search analysis. The improvements made for LZ will include shorter neutron pulse times, multiple neutron conduit configurations, and lower energy neutrons. The upgrades allow for even lower energy measurements of the nuclear recoil response in LXe and an independent measurement of $L_{y}$, as well as providing less uncertainty in energy reconstruction. In addition to discussing the physics of the neutron calibrations, I will describe the hardware systems used to implement them. [Preview Abstract] |
Saturday, April 16, 2016 2:54PM - 3:06PM |
C16.00008: Liquid-purity monitor for the LUX-ZEPLIN dark matter search Aaron Manalaysay The LUX-ZEPLIN (LZ) experiment will be the first liquid-xenon (LXe) dark matter search to feature a multi-tonne fiducial target. Drawing on the lessons learned in the LUX and ZEPLIN experiments, this next step will probe dark-matter candidates with unprecedented sensitivity. As these LXe detectors have grown larger, so too has the distance over which ionization electrons (from particle interactions) must be drifted through the liquid. Because of this, even minute levels of electronegative impurities can significantly attenuate the ionization signal, and must therefore be closely monitored. I will present the concept of a liquid-purity monitor which uses new and novel techniques, including state-of-the-art UV LEDs and low-work-function materials, and will measure levels of impurities in LZ's liquid circulation line in real time. This device will provide vital supplemental data to the roughly weekly in-situ purity measurements carried out within the detector's active volume, will greatly improve the resolution of the ionization channel in this detector, and will yield instant feedback in response to changing detector conditions. [Preview Abstract] |
Saturday, April 16, 2016 3:06PM - 3:18PM |
C16.00009: Circulation and Purification in the LUX-ZEPLIN System Test Shaun Alsum LZ is a dark-matter direct detection experiment whose detector is a two-phase TPC using approximately seven tons of active xenon as its scintillator. The xenon must have few electronegative impurities to ensure sufficient electron transport through the drift region. The LZ purification system is being prototyped in the LZ system test, a test platform located at SLAC using about 100kg of Xenon, which consists of gas circulation through a SAES getter. We utilize a dual-phase and a gas-phase heat exchanger to reduce needed cooling power. To achieve this circulation we employ an all metal seal triple diaphragm pump, also prototyped in the System Test. This talk will present early results from the system test as well as some baseline LZ designs. [Preview Abstract] |
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