Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session T12: Axions IVLive
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Chair: Gianpaolo Carosi, LLNL Room: Maryland B |
Monday, April 20, 2020 3:30PM - 3:42PM Live |
T12.00001: The ADMX four-cavity array system Gianpaolo Carosi The Axion Dark Matter eXperiment (ADMX) is a DOE "Generation 2" direct-detection dark matter project that is currently searching for axions in the 1 GHz (4 $\mu$eV) mass range. To scan for higher mass (or higher frequency) axions the cavities need to become smaller. However this leads to lower signal as the sampled volume of dark matter decreases. ADMX is in the process of producing a 4-cavity array that will take advantage of the large wavelength nature of the axion and allow the DFSZ search to continue up to 2 GHz (8 $\mu$eV) and beyond. This necessarily leads to added system complexity. Here I will present an overview of the upcoming ADMX multi-cavity system. [Preview Abstract] |
Monday, April 20, 2020 3:42PM - 3:54PM Live |
T12.00002: ADMX-Orpheus: A Dielectrically-Loaded Fabry-Perot Resonator to Search for Higher Mass Axions Raphael Cervantes Axions in our local dark matter halo could be detected using an apparatus consisting of a resonant microwave cavity threaded by a strong magnetic field. The ADMX experiment uses this technique to search for axions in the few micro-eV mass range. However, the ADMX search technique becomes increasingly challenging with increasing axion mass. This is because higher masses require smaller-diameter cavities, and a smaller cavity volume reduces the signal strength. Thus, there is interest in developing more sophisticated resonators to overcome this problem. The ADMX-Orpheus experiment uses a dielectric-loaded Fabry-Perot resonator to search for axions with masses approaching 100 micro-eV. We present progress on the cryogenic prototype. [Preview Abstract] |
Monday, April 20, 2020 3:54PM - 4:06PM Live |
T12.00003: Analysis of Design Parameters for DM Radio 50 L Magnet Alexander Leder Axions are a well-motivated dark matter candidate, which currently have a wide open and accessible parameter space, with few constraints on their mass and coupling strength to photons. The DM Radio experiment seeks to explore a large portion of the axion parameter space (between 100Hz-300MHz), taking advantage of lumped element high-Q resonators with optimal out-of-band sensitivity. In this talk, we will analyze the constraints for a practical magnet design including: cryo-engineering, geometric factors, magnetic pressures/stresses and fringe field considerations. These constraints will then inform the design of the DM Radio 50 L magnet as well as an upgraded DM Radio m^3 magnet with sensitivity to the QCD axion. [Preview Abstract] |
Monday, April 20, 2020 4:06PM - 4:18PM Live |
T12.00004: Progress on the Axion Resonant Interaction DetectioN Experiment (ARIADNE) Chloe Lohmeyer, Nancy Aggarwal, Andrew Geraci The Axion Resonant Interaction Detection Experiment (ARIADNE) will look for monopole-dipole interactions mediated by the QCD axion field in the mass range of 1$\mu $eV to 6meV. Modulating an unpolarized Tungsten mass in close proximity to polarized helium-3 gas creates an effective transverse magnetic field as seen by the He-3 spins, which drives a nuclear magnetic resonance transition. In this talk, I will discuss the experimental principles, the expected challenges of the experiment, as well as the latest updates. [Preview Abstract] |
Monday, April 20, 2020 4:18PM - 4:30PM Live |
T12.00005: Hunting solar axions and ALPs with the next-gen helioscopea IAXO and BabyIAXO Julia Vogel Helioscopes are one of three major types of axion experiments and search for axions produced in the core of the Sun via the Primakoff effect. The International Axion Observatory (IAXO) is a next generation axion helioscope aiming at a sensitivity to the axion-photon coupling of 1 - 1.5 orders of magnitude beyond the current most sensitive axion helioscope which is the CERN Axion Solar Telescope (CAST). IAXO will be able to challenge the stringent bounds from supernova SN1987A and furthermore test the axion interpretation of anomalous white-dwarf cooling. Beyond standard axions, this new experiment will also be able to search for a large variety of ALPs and other novel excitations at the low-energy frontier of elementary particle physics. BabyIAXO is proposed as a first stage towards IAXO and aims at extending the sensitivity to axion-photon couplings down to a few 10$^{\mathrm{-11}}$ GeV$^{\mathrm{-1}}$. Thus the experiment will deliver significant physics results while demonstrating the feasibility of the full-scale IAXO experiment by validating all subcomponents (magnet, optics, detectors, infrastructure). Here we introduce IAXO and BabyIAXO, report on the current status of both experiments and outline the expected science reach [Preview Abstract] |
Monday, April 20, 2020 4:30PM - 4:42PM Live |
T12.00006: exotic spin-spin-velocity-dependent interaction measurement with a SERF magnetometer and a polarized DyIG sample Pinghan Chu, Young Jin Kim, Igor M. Savukov, Shaun G. Newman, Joshua C. Long Exotic spin-dependent interactions have recently attracted much attention because their discovery can lead to new physics beyond the Standard Model. The exotic interactions between fermions can be mediated by new fundamental spin-0 or spin-1 bosons such as the axion or the dark photon. Lately, a new experimental approach based on highly sensitive spin-exchange relaxation free (SERF) magnetometers has been introduced to search for exotic spin-dependent interactions. The current constraints have been significantly improved using SERF magnetometers to detect magnetic-field-like effects induced by the interactions. For a polarized target, ferrimagnetic dysprosium iron garnet (DyIG) was proposed due to its near-zero magnetization at the critical temperature around 220-240 K. We will present our first measurements on exotic spin-spin-velocity-dependent interactions between polarized electron spins of DyIG sample and polarized Rb spins of a SERF magnetometer. A significant challenge is minimization of magnetic noise from the DyIG sample, which can be done by keeping the sample at near-zero magnetization using thermally stabilized cooling system and using methods for subtracting systematic effects from residual magnetization. [Preview Abstract] |
Monday, April 20, 2020 4:42PM - 4:54PM Live |
T12.00007: The Any Light Particle Search (ALPS) II experiment Giuseppe Messineo ALPS II is a second generation light shining through a wall (LSW) experiment that will search for axion-like particles (ALPs) as well as other low mass weakly interacting particles and hidden sector photons. A high power laser beam is sent through a magnetic field region where, due to a process known as Sikivie effect, a small fraction of the photons convert into ALPs. An optical barrier prevents photons from reaching a second magnetic region where a small fraction of the ALPs reconvert back to photons and are detected as “light shining through a wall”. ALPS II is the first large scale LSW experiment being built and it will use two mode matched optical cavities in a resonant regeneration scheme to increase the expected signal by many orders of magnitude with respect to previous experiments. ALPS II is currently being installed at DESY Hamburg (Germany) and will make use of some of the existing infrastructure used in the HERA accelerator, such as tunnels, cryogenics and two 120 m long strings of modified HERA superconducting dipole magnets. In this talk I will provide the current status of the experiment, its schedule as well as a brief discussion of the technological challenges involved. [Preview Abstract] |
Monday, April 20, 2020 4:54PM - 5:06PM |
T12.00008: ADMX Future Plans: 10 $\mu$eV and Beyond Andrew Sonnenschein The Axion Dark Matter Experiment (ADMX) is a DOE Generation 2 dark matter project and will cover masses up to 9 $\mu$eV (2 GHz in microwave frequency) with sensitivity to most QCD axion models. Work has begun to extend sensitivity to higher axion masses by developing a number of new technologies, including arrays of high-Q superconducting microwave resonators, high field magnets and lower noise amplifiers, potentially operating at noise levels below the Standard Quantum Limit. In this talk we will review the ADMX technology development roadmap and plans for next generation experiments. [Preview Abstract] |
Monday, April 20, 2020 5:06PM - 5:18PM Not Participating |
T12.00009: Optically Pumped Magnetometer as a Low Frequency Axion Detector Leanne Duffy, Pinghan Chu, Young Jin Kim, Igor Savukov, Al Urbaitis We are testing the use of an optically pumped magnetometer as a sensitive magnetic field detector for a dark matter axion search with an LC circuit. We have optimized the experimental design with a 2 T magnet available at Los Alamos National Laboratory. The magnet is being recommissioned, and we report on the progress and sensitivity of this experiment, and possible upgrades. [Preview Abstract] |
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