The Next Generation of Axion Helioscopes: The International Axion Observatory (IAXO)

J.K. Vogel, E. Armengaud, F.T. Avignone, M. Betz, P. Brax, Philipp Georg Brun, G. Cantatore, J.M. Carmona, G.P. Carosi, F. Caspers, S. Caspi, S.A. Cetin, D. Chelouche, Finn Erland Christensen, Anders Clemen Jakobsen

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The International Axion Observatory (IAXO) is a proposed 4th-generation axion helioscope with the primary physics research goal to search for solar axions via their Primakoff conversion into photons of 1 – 10 keV energies in a strong magnetic field. IAXO will achieve a sensitivity to the axion-photon coupling gaγ down to a few ×10−12 GeV−1 for a wide range of axion masses up to ∼ 0.25eV. This is an improvement over the currently best (3rd generation) axion helioscope, the CERN Axion Solar Telescope (CAST), of about 5 orders of magnitude in signal strength, corresponding to a factor ∼ 20 in the axion photon coupling. IAXO's sensitivity relies on the construction of a large superconducting 8-coil toroidal magnet of 20 m length optimized for axion research. Each of the eight 60cm diameter magnet bores is equipped with x-ray optics focusing the signal photons into ∼ 0.2cm2 spots that are imaged by very low background x-ray detectors. The magnet will be built into a structure with elevation and azimuth drives that will allow solar tracking for 12hours each day. This contribution is a summary of our papers [1–3] and we refer to these for further details.
Original languageEnglish
JournalPhysics Procedia
Pages (from-to)193-200
Publication statusPublished - 2015

Bibliographical note

This is an open access article under the CC BY-NC-ND license (


  • Dark matter
  • Axion
  • Strong CP problem
  • Helioscopes
  • IAXO
  • ALP
  • Astroparticle physics


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