Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session T11: Axion and Hidden Sector Searches II |
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Sponsoring Units: DPF Chair: Heidi Schellman, Oregon State University Room: Marquette II - 2nd Floor |
Tuesday, April 18, 2023 10:45AM - 10:57AM |
T11.00001: Operational status and analysis results of ADMX-G2 Run 1C-extended Dan Zhang The discovery of axions could resolve two important puzzles at the same time: the strong CP problem and the abundance of dark matter. The Axion Dark Matter eXperiment (ADMX) probes the conversion of axions into photons with a high-Q tunable resonator immersed in a strong magnetic field. Leveraging an ultra-low-noise amplifier chain, ADMX has already achieved Dine-Fischler-Srednicki-Zhitnisky (DFSZ) coupling sensitivities to micro-eV axions. In this talk, I will summarize the status of the experiment and present the latest results of the on-going Run 1C, an extended search for DFSZ axions in the 3.23-3.337 and 3.900-3.924 micro-eV mass range. |
Tuesday, April 18, 2023 10:57AM - 11:09AM |
T11.00002: Near term plans for ADMX Run 1D Operations Gianpaolo P Carosi, Nick Du The Axion Dark Matter eXperiment (ADMX) searches for primordial ultra-light (few micro-eV) mass axions by resonantly converting them into detectable microwave photons in the presence of a high (7.6 Tesla) static magnetic field. ADMX recently completed run 1C with sensitivity up to 1.02 GHz. In order to reach higher masses both the microwave cavity and quantum amplifier chain need to be replaced. In this talk I will outline the design and testing of the new cavity system for the following run 1D, which will have sensitivity up to 1.36 GHz. I will also discuss parallel testing of the quantum amplifiers and planning improvements to the experimental system as we prepare for continuing the search starting summer of 2023. |
Tuesday, April 18, 2023 11:09AM - 11:21AM |
T11.00003: Optimizing Axion Dark Matter Multi-Cavity Designs Nate Otto The Axion Dark Matter eXperiment (ADMX) searches for the well motivated QCD Dark Matter axion via its conversion into a photon in the presence of a strong magnetic field. ADMX design 2A is a haloscope consisting of four identical copper plated cylindrical cavities, looking for signals with frequencies between 1.4 and 2.1 GHz. Across the available range of the tuning rod inside the cavity, the 2A design will extend the sensitivity in the search for axions in the 6-8 µeV mass range. The ADMX 2A cavities are simulated at Fermilab with COMSOL to predict and enhance various physical parameters of the system. Such parameters include the quality factor, form factor, and a mode map of the system. We present several techniques to improve losses due to leakage in order to achieve QLeakage > 106 . This work gives insight to understanding how cavity designs affect the Q of a given system. |
Tuesday, April 18, 2023 11:21AM - 11:33AM |
T11.00004: Superconducting RF Cavities for the Axion Dark Matter eXperiment Thomas Braine 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 can 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 magnetic fields ADMX would operate in. In this work, we present our progress on studying different materials at LLNL, primarily NbTi, Nb3Sn and YBCO, using small test RF cavities with varying purpose-built geometries, that can operate in a Physical Properties Measurement System (PPMS), capable of fields up to 14 T and temperatures down to 2 K. Additionally, plans to conduct an axion search with a ‘hybrid’-SRF cavity as part of the ADMX sidecar will be presented. This work is being done as part of the design studies for the next phase of ADMX covering the 2-4 GHz range. |
Tuesday, April 18, 2023 11:33AM - 11:45AM |
T11.00005: An Improved synthetic axion injection for HAYSTAC Yuqi Zhu, Michael Jewell
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Tuesday, April 18, 2023 11:45AM - 11:57AM |
T11.00006: Searching for the Higgs Portal Scalar at ICARUS Jamie C Dyer The ICARUS detector is a liquid argon time projection chamber (LArTPC) acting as the far detector in the Short Baseline Neutrino program at Fermilab. Complementing its ability to better constrain neutrino physics, ICARUS is also sensitive to Beyond Standard Model searches. The Higgs Portal model, which introduces a dark scalar particle that mixes with the Higgs boson, is one such example. Uniquely positioned only 6 degrees off-axis from the 120~GeV Neutrinos at the Main Injector (NuMI) beam, ICARUS is sensitive to Higgs Portal Scalars originating from NuMI kaons and decaying to di-lepton pairs. This talk discusses progress towards the selection of electron/positron shower pairs produced from sub-210~MeV scalars within ICARUS, and strategies to distinguish this signal from cosmogenic and neutrino background. Upon completion, the analysis is expected to directly probe the Higgs Portal parameter space to lower mixing angles for ~40-210 MeV scalars than previous experimental results. |
Tuesday, April 18, 2023 11:57AM - 12:09PM |
T11.00007: Toward a heavy axion selection in MicroBooNE using the NuMI beam Keng Lin MicroBooNE was a Liquid Argon Time Projection Chamber (LArTPC) detector with an 85 tonnes fiducial mass, located off-axis in the Neutrinos at the Main Injector (NuMI) beam at Fermilab. The goals of MicroBooNE includes searching for exotic particles such as axions. Axions are hypothetical pseudo scalar bosons, originally introduced to solve the strong CP problem in QCD. They are assumed to have a mass below the eV scale; however, by introducing a new strongly-coupled mirror SU(3) sector, heavy axions can be obtained with masses from 20MeV to 2GeV. These axions, coming from the target of the NuMI beam via meson-mixing and gluon-gluon fusion, can decay into two visible photons that would be detectable with MicroBooNE. This talk will explore MicroBooNE’s sensitivity to heavy axions with this diphoton decay channel based on Monte Carlo simulations. |
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