open access publication

Article, 2023

Searching for dark matter with plasma haloscopes

In: Physical Review D, ISSN 2470-0010, 2470-0029, 1550-7998, 1550-2368, 1089-4918, Volume 107, 5, Page 055013, 10.1103/physrevd.107.055013

Contributors (31)

Millar, Alexander John (0000-0003-3526-0526) [1] [2] Anlage, Steven Mark (0000-0001-7850-9059) [3] Balafendiev, Rustam (0000-0001-5081-5257) [4] Belov, Pavel [5] Van Bibber, Karl A [6] Conrad, Jan [2] Demarteau, Marcel [7] Droster, Alexander [6] Dunne, Katherine [2] Rosso, Andrea Gallo (0000-0002-4664-5504) [2] Gudmundsson, Jon E (0000-0003-1760-0355) [2] [4] Jackson, Heather [6] Kaur, Gagandeep [2] [8] [9] Klaesson, Tove [2] Kowitt, Nolan [6] Lawson, Matthew M (0000-0001-8545-3620) [2] Leder, Alexander [6] Miyazaki, Akira [10] Morampudi, Sid [11] Peiris, Hiranya Vajramani (0000-0002-2519-584X) [2] [12] Røising, Henrik Schou (0000-0002-2229-0294) [13] Singh, Gaganpreet [2] Sun, Dajie [6] Thomas, Jacob H. [14] Wilczek, Frank A (0000-0002-6489-6155) [2] [11] [15] [16] Withington, Stafford [17] Wooten, Mackenzie [6] Dilling, Jens [7] Febbraro, Michael [7] Knirck, Stefan (0000-0002-5714-4545) [1] Marvinney, Claire Elizabeth (0000-0002-0289-8059) [7]


  1. [1] Fermilab
  2. [NORA names: United States; America, North; OECD]
  3. [2] Stockholm University
  4. [NORA names: Sweden; Europe, EU; Nordic; OECD]
  5. [3] University of Maryland, College Park
  6. [NORA names: United States; America, North; OECD]
  7. [4] University of Iceland
  8. [NORA names: Iceland; Europe, Non-EU; Nordic; OECD]
  9. [5] Narxoz University
  10. [NORA names: Kazakhstan; Asia, Central]


We summarize the recent progress of the Axion Longitudinal Plasma Haloscope (ALPHA) Consortium, a new experimental collaboration to build a plasma haloscope to search for axions and dark photons. The plasma haloscope is a novel method for the detection of the resonant conversion of light dark matter to photons. ALPHA will be sensitive to QCD axions over almost a decade of parameter space, potentially discovering dark matter and resolving the strong CP problem. Unlike traditional cavity haloscopes, which are generally limited in volume by the Compton wavelength of the dark matter, plasma haloscopes use a wire metamaterial to create a tuneable artificial plasma frequency, decoupling the wavelength of light from the Compton wavelength and allowing for much stronger signals. We develop the theoretical foundations of plasma haloscopes and discuss recent experimental progress. Finally, we outline a baseline design for ALPHA and show that a full-scale experiment could discover QCD axions over almost a decade of parameter space.


CP problem, Compton wavelength, QCD axion, alpha, axions, baseline design, collaboration, consortium, conversion, dark matter, dark photon, decades, design, detection, experimental collaborations, experimental progress, experiments, foundation, frequency, full-scale experiments, haloscopes, light, light dark matter, matter, method, novel method, parameter space, photons, plasma frequency, problem, progress, recent experimental progress, recent progress, resonant conversion, signals, space, strong CP problem, strong signal, theoretical foundation, volume, wavelength, wavelength of light, wire


  • European Research Council
  • Knut and Alice Wallenberg Foundation
  • Swedish Research Council
  • Göran Gustafsson Foundation
  • Fermilab
  • Los Alamos National Laboratory
  • Oak Ridge National Laboratory
  • Directorate for Mathematical & Physical Sciences
  • Battelle
  • United States Department of Energy
  • Office of Science