Public Abstract

DE-SC0010296: Search for dark matter axions with ADMX (2023)

Award Status: Active

Institution: University of Florida, Gainesville, FL
UEI: NNFQH1JAPEP3
DUNS: 969663814

Most Recent Award Date: 03/05/2024
Number of Support Periods: 12
PM: Bautista, Manuel

Current Budget Period: 04/01/2024 - 03/31/2025
Current Project Period: 08/01/2023 - 03/31/2025
PI: Tanner, David

Supplement Budget Period: N/A

Public Abstract

Application Title: Search for dark-matter axions with ADMX David B. Tanner (Principal Investigator) Neil S. Sullivan(Co-Investigator) The axion affects two important issues in particle physics and astrophysics:the origin of CP symmetry in the strong interactions and the composition of the dark matter of the Universe. Current laboratory, astrophysical, and cosmological observations place the mass of the axion inthe2µeV–1meVrange.Axionsareespeciallysignificantasdarkmatteriftheirmass is of order 2–40 µeV. They would then make up the dark-matter halos of galaxies.These haloaxionsmaybedetectedbytheirconversionintophotonsinatunablehigh-quality-factor microwavecavitypermeatedbyastrongexternalmagnetic field.Thecorrespondingresonant frequencies are in the microwave part of the electromagnetic spectrum:0.5–10 GHz.The Axion Dark Matter eXperiment, called ADMX, uses near quantum-limited SQUID-based amplifiers, with both cavity and amplifier operated at ultralow temperatures (around 0.1 K)to reduce background and technical noise.The Generation-2 ADMX detector is the first experiment sensitive enough to detect the most likely kind of axion.The Florida ADMX groupwillcontinueitsparticipationinoperationsofthedetector,inanalysisofADMX datafornarrowspectralfeaturesarisingfromtheexpected flowsofaxionsintheGalaxy, in improving the control system of the detector, and in support of the experiment’s dilution refrigerator.In addition, we will carry out design work and characterization for cavities that couldbeusedintheADMXExtendedFrequencyRangeprojecttodetectaxionswithmasses between 8 and 16 µeV (approximately 2–4 GHz resonant frequencies).These cavities have smaller volume than the currently operating search at 4 µeV (1 GHz) requiring the use of arraysofupto18cavitieswiththeiroutputs combinedtoprovide alargersignal.

Application Title: Search for dark-matter axions with ADMX
David B. Tanner (Principal Investigator)
Neil S. Sullivan(Co-Investigator)

The axion affects two important issues in particle physics and astrophysics:the origin of CP symmetry in the strong interactions and the composition of the dark matter of the Universe. Current laboratory, astrophysical, and cosmological observations place the mass of the axion inthe2µeV–1meVrange.Axionsareespeciallysignificantasdarkmatteriftheirmass is of order 2–40 µeV. They would then make up the dark-matter halos of galaxies.These haloaxionsmaybedetectedbytheirconversionintophotonsinatunablehigh-quality-factor microwavecavitypermeatedbyastrongexternalmagnetic field.Thecorrespondingresonant frequencies are in the microwave part of the electromagnetic spectrum:0.5–10 GHz.The Axion Dark Matter eXperiment, called ADMX, uses near quantum-limited SQUID-based amplifiers, with both cavity and amplifier operated at ultralow temperatures (around 0.1 K)to reduce background and technical noise.The Generation-2 ADMX detector is the first experiment sensitive enough to detect the most likely kind of axion.The Florida ADMX groupwillcontinueitsparticipationinoperationsofthedetector,inanalysisofADMX datafornarrowspectralfeaturesarisingfromtheexpected flowsofaxionsintheGalaxy, in improving the control system of the detector, and in support of the experiment’s dilution refrigerator.In addition, we will carry out design work and characterization for cavities that couldbeusedintheADMXExtendedFrequencyRangeprojecttodetectaxionswithmasses between 8 and 16 µeV (approximately 2–4 GHz resonant frequencies).These cavities have smaller volume than the currently operating search at 4 µeV (1 GHz) requiring the use of arraysofupto18cavitieswiththeiroutputs combinedtoprovide alargersignal.