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Broadband and Resonant Approaches to Axion Dark Matter Detection

Broadband and Resonant Approaches to Axion Dark Matter Detection When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current that follows the magnetic field lines and oscillates at the axion Compton frequency. We propose a new experiment to detect this axion effective current. In the presence of axion dark matter, a large toroidal magnet will act like an oscillating current ring, whose induced magnetic flux can be measured by an external pickup loop inductively coupled to a SQUID magnetometer. We consider both resonant and broadband readout circuits and show that a broadband approach has advantages at small axion masses. We estimate the reach of this design, taking into account the irreducible sources of noise, and demonstrate potential sensitivity to axionlike dark matter with masses in the range of 10 - 14 - 10 - 6 e V . In particular, both the broadband and resonant strategies can probe the QCD axion with a GUT-scale decay constant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Broadband and Resonant Approaches to Axion Dark Matter Detection

Physical Review Letters , Volume 117 (14): 6 – Sep 30, 2016

Broadband and Resonant Approaches to Axion Dark Matter Detection

Physical Review Letters , Volume 117 (14): 6 – Sep 30, 2016

Abstract

When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current that follows the magnetic field lines and oscillates at the axion Compton frequency. We propose a new experiment to detect this axion effective current. In the presence of axion dark matter, a large toroidal magnet will act like an oscillating current ring, whose induced magnetic flux can be measured by an external pickup loop inductively coupled to a SQUID magnetometer. We consider both resonant and broadband readout circuits and show that a broadband approach has advantages at small axion masses. We estimate the reach of this design, taking into account the irreducible sources of noise, and demonstrate potential sensitivity to axionlike dark matter with masses in the range of 10 - 14 - 10 - 6 e V . In particular, both the broadband and resonant strategies can probe the QCD axion with a GUT-scale decay constant.

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Publisher
American Physical Society (APS)
Copyright
© 2016 American Physical Society
Subject
LETTERS; Elementary Particles and Fields
ISSN
0031-9007
eISSN
1079-7114
DOI
10.1103/PhysRevLett.117.141801
pmid
27740816
Publisher site
See Article on Publisher Site

Abstract

When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current that follows the magnetic field lines and oscillates at the axion Compton frequency. We propose a new experiment to detect this axion effective current. In the presence of axion dark matter, a large toroidal magnet will act like an oscillating current ring, whose induced magnetic flux can be measured by an external pickup loop inductively coupled to a SQUID magnetometer. We consider both resonant and broadband readout circuits and show that a broadband approach has advantages at small axion masses. We estimate the reach of this design, taking into account the irreducible sources of noise, and demonstrate potential sensitivity to axionlike dark matter with masses in the range of 10 - 14 - 10 - 6 e V . In particular, both the broadband and resonant strategies can probe the QCD axion with a GUT-scale decay constant.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Sep 30, 2016

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