3D lumped LC resonators as low mass axion haloscopes

Ben T. McAllister, Stephen R. Parker, and Michael E. Tobar
Phys. Rev. D 94, 042001 – Published 11 August 2016

Abstract

The axion is a hypothetical particle considered to be the most economical solution to the strong CP problem. It can also be formulated as a compelling component of dark matter. The haloscope, a leading axion detection scheme, relies on the conversion of galactic halo axions into real photons inside a resonant cavity structure in the presence of a static magnetic field, where the generated photon frequency corresponds to the mass of the axion. For maximum sensitivity it is key that the central frequency of the cavity mode structure coincides with the frequency of the generated photon. As the mass of the axion is unknown, it is necessary to perform searches over a wide range of frequencies. Currently there are substantial regions of the promising preinflationary low-mass axion range without any viable proposals for experimental searches. We show that three-dimensional resonant LC circuits with separated magnetic and electric fields, commonly known as reentrant cavities, can be sensitive dark matter haloscopes in this region, with frequencies inherently lower than those achievable in the equivalent size of empty resonant cavity. We calculate the sensitivity and accessible axion mass range of these experiments, designing geometries to exploit and maximize the separated magnetic and electric coupling of the axion to the cavity mode.

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  • Received 18 May 2016

DOI:https://doi.org/10.1103/PhysRevD.94.042001

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Ben T. McAllister*, Stephen R. Parker, and Michael E. Tobar

  • ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia

  • *ben.mcallister@uwa.edu.au
  • michael.tobar@uwa.edu.au

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Issue

Vol. 94, Iss. 4 — 15 August 2016

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