Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session H14: Experimental Dark Matter DetectionLive
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Sponsoring Units: DAP DPF Chair: Arran Phipps, Stanford University Room: Virginia A |
Sunday, April 19, 2020 10:45AM - 10:57AM Live |
H14.00001: Boradband Electric Axion Sensing Techniques for dark matter detection Michael Tobar, Ben McAllister, Maxim Goryachev Due to the inverse Primakoff effect, it has been shown that when axions interact with a DC electromagnet an AC voltage source will be produced, which oscillates at the Compton frequency of the axion [1]. In this work we use this result to calculate the sensitivity of a variety of electric sensing techniques for low-mass axions with solutions valid in the quasi-static limit. For example, we calculate the currents and voltages induced in circuits that consists of conducting wires and capacitors due to axions under a spatially varying DC $\vec{B}$-field, such as those supplied by a toroid or solenoid electromagnet. We also investigate the limit where the DC $\vec{B}$-field can be considered as spatially constant, which occurs when the sensing element is small when compared to the spatial extent of the electromagnet, and placed centrally within the magnet. The end result is the realisation of new low-mass Broadband Electric Axion Sensing Techniques (BEAST) with improved sensitivity for low-mass detection. [1] ME Tobar, BT McAllister, M Goryachev, Physics of the Dark Universe 26, 100339 (2019). [Preview Abstract] |
Sunday, April 19, 2020 10:57AM - 11:09AM Live |
H14.00002: Searching for Higher Mass Axion Dark Matter at the University of Western Australia Ben McAllister, Michael Tobar, Maxim Goryachev, Eugene Ivanov, Graeme Flower, Catriona Thomson, Aaron Quiskamp, William Campbell Axions are a popular dark matter candidate, due to their ability to both constitute cold dark matter, and solve the Strong CP problem. The most common axion search technique is the haloscope, which attempts to convert galactic halo axions into photons. Confounding haloscopes is the fact that the axion mass (and the energy of the photons produced) is unknown. This necessitates experiments over a broad mass range. Recent work has indicated the high (\textgreater 50 mu-eV) axion mass range as especially promising, but haloscope techniques become impractical in this range due to technical factors. \newline At UWA we are constructing a suite of axion detection experiments to access the high mass regime. This includes ORGAN [1], UPLOAD/DOWNLOAD [2], and Axion-Magnon experiments [3]. I will give an overview of these efforts, and novel resonator designs for high mass haloscopes. 1. The ORGAN Experiment: An axion haloscope above 15 GHz, B. T. McAllister et al, Phys.Dark Univ. 18 (2017) 67-72 2. Results from UPLOAD-DOWNLOAD: A phase-interferometric axion dark matter search, C. A. Thomson et al, 2019 e-Print: arXiv:1912.07751 3. Broadening frequency range of a ferromagnetic axion haloscope with strongly coupled cavity--magnon polaritons, G. Flower et al, Phys.Dark Univ. 25 (2019) 100306 [Preview Abstract] |
Sunday, April 19, 2020 11:09AM - 11:21AM Live |
H14.00003: Production and Installation of the LUX-ZEPLIN Cathode High Voltage Delivery System James Watson, Daniel McKinsey, Ethan Bernard UX-ZEPLIN (LZ) is a 7-ton active volume dual phase xenon time projection chamber (TPC) that will perform several rare event searches starting later this year. The 1.456 meter drift length poses particular challenges for the experiment. The generation and maintenance of a uniform drift field of 300 Volts / cm is one aspect that becomes difficult at large length scales. High voltage must be delivered to the cathode without producing any additional light, spoiling the xenon’s purity, or exceeding the allowed radioactive background. To ensure that these effects will not diminish LZ’s sensitivity, a prototype of the cathode high voltage cable feedthrough was tested at Lawrence Berkeley National Lab under conditions mimicking those in LZ. The production feedthrough and connection was machined, assembled, and installed at Sanford Underground Research Facility this spring. In this talk I present the overall aspects of this component of the LZ experiment and the process of assuring its quality relating to the unique aspects required of it. [Preview Abstract] |
Sunday, April 19, 2020 11:21AM - 11:33AM Live |
H14.00004: Nuclear Recoil Calibration in the LUX Detector Down to 0.45 keV for Light Yield and 0.27 keV for Charge Yield Using a Pulsed D-D Neutron Generator Dongqing Huang We report an improved nuclear recoil calibration in the LUX detector in situ at the Sanford Underground Research Facility using neutron events from a pulsed Adelphi Deuterium-Deuterium (DD) generator. The calibration incorporates neutron pulses with an instantaneous flux of (2.8$\times 10^8$ neutrons/sec) with a narrow width (20 us) at a frequency of 250 Hz. We have measured the absolute rates of individual nuclear recoil (NR) events in the 250 kg liquid Xe TPC with ionization signals at and above 2 extracted electrons and with scintillation signals of zero, one or more detected photons. This is the first time a calibration measurement has been made of the absolute event rates of charge-only S2 events (no scintillation photons detected) in a Xe TPC and provides an important probe of the ultra-low energy measurement of the charge yields in LXe. This technique provides direct measurements of scintillation (Ly) and charge (Qy) yields down to 0.45 keVnr and 0.27 keVnr, respectively. New calibration results on ultra-low energy nuclear recoil yields are crucial to determine physics search sensitivities for large mass LXe TPCs (LZ experiment) for low mass WIMPs (< 10 GeV) and for coherent neutrino scattering (e.g. $^8$B solar neutrino detection). [Preview Abstract] |
Sunday, April 19, 2020 11:33AM - 11:45AM Live |
H14.00005: Search for invisible Higgs decays in vector boson fusion at $\surd $s $=$ 13 TeV with the ATLAS detector Ava Myers, Tae Min Hong, Ben Carlson Many extensions to the Standard Model predict that the Higgs boson acts as a portal to the dark sector. In this talk I present the results of a search for invisible Higgs decays in the VBF channel using 36fb-1 of data collected by the ATLAS experiment in 2015 and 2016. I also discuss the progress of the same search using the full LHC Run 2 dataset. [Preview Abstract] |
Sunday, April 19, 2020 11:45AM - 11:57AM Live |
H14.00006: Status and Prospects of the SuperCDMS SNOLAB Experiment Jodi Cooley The SuperCDMS SNOLAB detector is a Generation-2 dark matter experiment under construction underground in the SNOLAB facility which is located near Sudbury, Canada. The experiment will employ two types of state of the art cryogenic Ge and Si detectors photolithographically patterned to detect ionization and phonon signals from particle interactions. The detectors will be deployed in a new radiopure cryostat and shield. In this talk, I will present the current status of the experiment and potential for science results. [Preview Abstract] |
Sunday, April 19, 2020 11:57AM - 12:09PM On Demand |
H14.00007: DarkSide-20k and its research and development Yi Wang The DarkSide-20k project is aiming to use a dual-phase argon detector to search WIMPs. It has the capability to push the sensitivity for WIMP detection several orders of magnitude beyond current levels. It will have ultra-low backgrounds and sensitivity to WIMP-nucleon cross section down to 1.2 x 10$^{47}$ cm$^2$ for WIMPs of 1 TeV/c$^2$ mass with a LAr exposure of 100 t yr. The DarkSide-20k detector is currently under construction at LNGS. The detector mainly consists of a sealed acrylic Time Projection Chamber (TPC), an active neutron veto constructed by gadolinium-doped acrylic panels and a membrane cryostat. The R&D of the TPC and the cryogenic system is currently in progress at CERN. The R&D of the veto detector is also underway, by cooperating with a company called Donchamp Acrylic. This talk will give an overview of the DarkSide-20k detector and discuss the R&D work for the TPC, the cryogenic system and the Veto detector. [Preview Abstract] |
Sunday, April 19, 2020 12:09PM - 12:21PM On Demand |
H14.00008: Search for Low Mass WIMPs with liquid argon TPCs: status and perspectives Claudio Savarese A body of astronomical and cosmological observations suggests the existence of Dark Matter. There is growing interest within the DM community in low-mass candidates, including light WIMPs with masses below 10 GeV/c$^2$, and sub-GeV/c$^2$ particles that interact with couplings smaller than the weak scale. Probing the parameter space for these low-mass DM candidates requires detectors with exceptionally low energy thresholds and background levels. The DarkSide collaboration demonstrated the ability of a dual-phase LAr-TPC to search for such particles by exploiting the very high electron extraction efficiency and the inherent gain of the ionization signal with the DarkSide-50 detector. A LAr-TPC specifically built to pursue lower-energy signals by focusing on the ionization channel could realistically push the experimental sensitivity to low-mass DM down to the solar neutrino floor. I will detail the experimental challenges connected to this goal and introduce the efforts that are currently being made to address these issues. Finally I will present the sensitivity projections that a future tonne-scale LAr-TPC could achieve. [Preview Abstract] |
Sunday, April 19, 2020 12:21PM - 12:33PM On Demand |
H14.00009: Probing Macroscopic Dark Matter Parameter Space Jagjit Sidhu Macroscopic dark matter (aka macros) constitutes a broad class of alternatives to particle dark matter with still significant unprobed regions of parameter space. Macros would interact with atoms or molecules through elastic scattering with (essentially) their geometric cross section. The initial energy transfer will result in high temperatures in the immediate vicinity of the trajectory of the macro, sufficient to ionize atoms and molecules. I will describe efforts to push down the existing constraints across a wide range of remaining masses. I discuss plans to use slabs of granite, which are typically very old, to constrain macros of low to moderate masses. I will discuss constraints derived from a lack of impacts that would have produced a devastating injury similar to a gunshot wound on the carefully monitored population of the Western world. I will also discuss how planned expansions of the Desert Fireball Network in Australia will allow a wide range of masses and cross sections to be constrained in upcoming decades. [Preview Abstract] |
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