Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session S10: Axion IRecordings Available
|
Hide Abstracts |
Sponsoring Units: DPF Chair: Yang Ma, University of Pittsburgh Room: Lyceum |
Monday, April 11, 2022 1:30PM - 1:42PM |
S10.00001: ADMX Design and Status: Run 1C and 1C-extended Michaela Guzzetti
|
Monday, April 11, 2022 1:42PM - 1:54PM |
S10.00002: Recent Results from ADMX Run1C Nick C Du One of the largest mysteries in physics is the nature of dark matter in our Universe. The axion is a well motivated candidate for dark matter that also solves the Strong CP problem. Axion haloscopes have been demonstrated as one of the best means of searching for dark matter axions. The ADMX halsocopeĀ has even managed to exclude the compelling but weakly coupled DFSZ axion. Most recently, ADMX completed a search for axions in the 3.3-4.2 Ī¼eV mass range, and this talk will discuss the results of that run. |
Monday, April 11, 2022 1:54PM - 2:06PM |
S10.00003: ADMX Cold Electronics Design and Characterization Jonah Hoffman The Axion Dark Matter eXperiment (ADMX) uses quantum limited electronics, in conjunction with a large volume microwave cavity in a 7.6 Tesla magnetic field, to place the most stringent limits on the QCD axion. The current ADMX G2 experiment is the only microwave cavity experiment to reach DFSZ sensitivities. The speed at which we can exclude axion mass parameter space depends on how well the experiment can amplify the microwave axion signal above the background electrical noise. Optimizing noise performance in the cold electronics is crucial for achieving high signal to noise ratio, since they are the first stage of amplification. As we move to frequencies above 1.5 GHz, higher cavity numbers (4 for ADMX run 2A and 18 for ADMX EFR) will necessitate an increase in complexity for the cold electronics system. We will discuss the design and characterization of the ADMX first stage, cold electronics used to achieve high scan speeds at DFSZ sensitivities, as well as how these electronic systems will evolve for multicavity experiments. |
Monday, April 11, 2022 2:06PM - 2:18PM |
S10.00004: Superconducting Cavity Development for ADMX Thomas Braine, Gianpaolo P Carosi The Axion Dark Matter eXperiment (ADMX) searches for Axions, a hypothetical dark matter candidate, through conversion to photons in a high magnetic field and are subsequently detected within a resonant cavity. The rate that this detector is able to scan potential axion masses (or photon frequency) depends linearly on the quality factor of the cavity. Though Superconducting Radio Frequency cavities (SRF) have been shown to have several orders of magnitude higher quality factor than copper, their quality factors typically degrade significantly in the high magnetic fields required for Axion detection. Some Type II superconductors have shown the potential for improved quality factors beyond that of copper even in the magnetic fields ADMX would operate in. In this work, we present our progress on studying these different materials at LLNL, primarily NbTi, using small RF cavities with varying purpose-built geometries, operating in fields up to 14 T and temperatures down to 2 K. A new analysis technique for in situ measurement of RF surface resistance of cavity sub-surfaces will also be presented. This work is being done as part of the design studies for the ADMX-Extended Frequency Range program covering the 2-4 GHz range. |
Monday, April 11, 2022 2:18PM - 2:30PM |
S10.00005: Updated Results from HAYSTAC's Quantum-Enhanced Search for Dark Matter Axions Michael Jewell The HAYSTAC Collaboration is currently searching for axion cold dark matter with the use of a resonant microwave cavity. Because both the mass of the axion and its coupling strength are largely unknown, a key figure of merit for a haloscope is the rate at which it can scan this vast parameter space. Recent progress in developing squeezed state receivers have allowed HAYSTAC to reduce noise levels below the standard quantum limit, resulting in a factor of two scan rate enhancement as first demonstrated in the search over the combined axion mass window of 16.96-17.12$\mu$eV and 17.14-17.28 $\mu$eV. This quantum enhanced search was continued between July and November 2021, extending the scanned region to axions with masses between 18.45-18.69$\mu$eV. In this talk, I will discuss the status of HAYSTAC with emphasis on the most recent data taking phase that includes improvements to the data acquisition routine which have reduced dead time by a factor of two, further improving the scan rate of the experiment. |
Monday, April 11, 2022 2:30PM - 2:42PM |
S10.00006: Alternative Analyses for HAYSTAC Maryam H Esmat The Haloscope at Yale Sensitive to Axion Cold dark matter (HAYSTAC) is a tunable microwave cavity experiment that searches for dark matter axions of masses above 20 μeV. HAYSTAC serves as a testbed for new technologies and its hallmark feature is the use of a quantum squeezed-state receiver to reduce noise below the standard quantum limit. In this search, axions from the Milky Way’s galactic halo undergo conversion in a strong magnetic field. The axion gives rise to a resonant photon signal that is then resonantly enhanced in the microwave cavity, which HAYSTAC would then be able to detect. In this talk, we discuss potential alternative analyses and multidetector search strategies that can be used to search for signals beyond the standard haloscope search. If an alternative analysis is sensitive to signals such as that from the cosmic axion background, this detection could provide insight to physics beyond the standard model. |
Monday, April 11, 2022 2:42PM - 2:54PM |
S10.00007: Optimizing Form Factors of Reentrant Cavities for Low-Frequency Axion Search Yaqi Han We present the optimized form factors of reentrant cavities of two different sizes designed for searching for axion dark matter in the frequency range 10 - 625 MHz. We show that the form factors can be improved by adding a adjustable extension with smaller radius to a simple cylindrical tuning post. We also show that the form factor could be improved by a reflection symmetric design. |
Monday, April 11, 2022 2:54PM - 3:06PM |
S10.00008: Exploration of Wire Array Metamaterials for the Plasmonic Axion Haloscope Mackenzie Wooten, Alexander G Droster, Saad A Kenany, Dajie Sun, Alexander F Leder, Samantha M Lewis, Karl A van Bibber A plasmonic haloscope has recently been proposed as a feasible approach to extend the search for dark matter axions above 10 GHz (~ 40 μeV), whereby the microwave cavity in a conventional axion haloscope is supplanted by a plasmonic wire array metamaterial. As the plasma frequency is a property of the bulk, a metamaterial resonator of arbitrarily high frequency may be made arbitrarily large, in contrast to a microwave cavity which incurs a steep penalty in volume with increasing frequency. We have investigated the basic properties of wire array metamaterials through S21 measurements in the 10 GHz range. We fit these S21 measurements to the equation for transmission through a medium with a complex permittivity to derive the basic properties of the metamaterial. Excellent agreement with theoretical models is found, including the onset of a well-defined plasma frequency. We project achievable quality factors to be of order 104 in an actual axion search. Furthermore, schemes for tuning the array over a usable dynamic range (~30% in frequency) appear practical from an engineering perspective. |
Monday, April 11, 2022 3:06PM - 3:18PM |
S10.00009: Low Mass Axion Searches with ADMX Ben McAllister
|
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700