• Open Access

Results from phase 1 of the HAYSTAC microwave cavity axion experiment

L. Zhong, S. Al Kenany, K. M. Backes, B. M. Brubaker, S. B. Cahn, G. Carosi, Y. V. Gurevich, W. F. Kindel, S. K. Lamoreaux, K. W. Lehnert, S. M. Lewis, M. Malnou, R. H. Maruyama, D. A. Palken, N. M. Rapidis, J. R. Root, M. Simanovskaia, T. M. Shokair, D. H. Speller, I. Urdinaran, and K. A. van Bibber
Phys. Rev. D 97, 092001 – Published 4 May 2018

Abstract

We report on the results from a search for dark matter axions with the HAYSTAC experiment using a microwave cavity detector at frequencies between 5.6 and 5.8 GHz. We exclude axion models with two photon coupling gaγγ2×1014GeV1, a factor of 2.7 above the benchmark KSVZ model over the mass range 23.15<ma<24.0μeV. This doubles the range reported in our previous paper. We achieve a near-quantum-limited sensitivity by operating at a temperature T<hν/2kB and incorporating a Josephson parametric amplifier (JPA), with improvements in the cooling of the cavity further reducing the experiment’s system noise temperature to only twice the standard quantum limit at its operational frequency, an order of magnitude better than any other dark matter microwave cavity experiment to date. This result concludes the first phase of the HAYSTAC program utilizing a conventional copper cavity and a single JPA.

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  • Received 9 March 2018

DOI:https://doi.org/10.1103/PhysRevD.97.092001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Particles & Fields

Authors & Affiliations

L. Zhong1, S. Al Kenany2, K. M. Backes1,*, B. M. Brubaker1, S. B. Cahn1, G. Carosi3, Y. V. Gurevich1, W. F. Kindel4, S. K. Lamoreaux1, K. W. Lehnert4, S. M. Lewis2, M. Malnou4, R. H. Maruyama1, D. A. Palken4, N. M. Rapidis2, J. R. Root2, M. Simanovskaia2, T. M. Shokair2, D. H. Speller1, I. Urdinaran2, and K. A. van Bibber2

  • 1Department of Physics, Yale University, New Haven, Connecticut 06511, USA
  • 2Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720, USA
  • 3Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 4JILA and the Department of Physics, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309, USA

  • *kelly.backes@yale.edu

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Vol. 97, Iss. 9 — 1 May 2018

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