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

J. K. Vogel, E. Armengaud, F. T. Avignone, M. Betz, P. Brax, P. Brun, G. Cantatore, J. M. Carmona, G. P. Carosi, F. Caspers, S. Caspi, S. A. Cetin, D. Chelouche, F. E. Christensen, A. Dael, T. Dafni, M. Davenport, A. V. Derbin, K. Desch, A. DiagoB. Döbrich, I. Dratchnev, A. Dudarev, C. Eleftheriadis, G. Fanourakis, E. Ferrer-Ribas, J. Galán, J. A. García, J. G. Garza, T. Geralis, B. Gimeno, I. Giomataris, S. Gninenko, H. Gómez, D. González-Díaz, E. Guendelman, C. J. Hailey, T. Hiramatsu, D. H.H. Hoffmann, D. Horns, F. J. Iguaz, I. G. Irastorza, J. Isern, K. Imai, A. C. Jakobsen, J. Jaeckel, K. Jakovčić, J. Kaminski, M. Kawasaki, M. Karuza, M. Krčmar, K. Kousouris, C. Krieger, B. Lakić, O. Limousin, A. Lindner, A. Liolios, G. Luzón, S. Matsuki, V. N. Muratova, C. Nones, I. Ortega, T. Papaevangelou, M. J. Pivovaroff, G. Raffelt, J. Redondo, A. Ringwald, S. Russenschuck, J. Ruz, K. Saikawa, I. Savvidis, T. Sekiguchi, Y. K. Semertzidis, I. Shilon, P. Sikivie, H. Silva, H. Ten Kate, A. Tomas, S. Troitsky, T. Vafeiadis, K. Van Bibber, P. Vedrine, J. A. Villar, L. Walckiers, A. Weltman, W. Wester, S. C. Yildiz, K. Zioutas

Research output: Contribution to journalConference articlepeer-review


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 g down to a few ×10-12 GeV-1 for a wide range of axion masses up to ∼ 0.25 eV. 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 60 cm diameter magnet bores is equipped with x-ray optics focusing the signal photons into ∼ 0.2 cm2 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 12 hours each day. This contribution is a summary of our papers [1-3] and we refer to these for further details.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalPhysics Procedia
StatePublished - 2015
Event13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013 - , United States
Duration: 8 Sep 201313 Sep 2013

Bibliographical note

Publisher Copyright:
© 2015 The Authors.


  • ALP
  • IAXO
  • astroparticle physics
  • axion
  • dark matter
  • helioscopes
  • strong CP problem

ASJC Scopus subject areas

  • General Physics and Astronomy


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