Dielectric Haloscopes: A New Way to Detect Axion Dark Matter
  We propose a new strategy to search for dark matter axions in the mass range of 40--400 $\mu$eV by introducing dielectric haloscopes, which consist of dielectric disks placed in a magnetic field. The changing dielectric media cause discontinuities in the axion-induced electric field, leading to the generation of propagating electromagnetic waves to satisfy the continuity requirements at the interfaces. Large-area disks with adjustable distances boost the microwave signal (10--100 GHz) to an observable level and allow one to scan over a broad axion mass range. A sensitivity to QCD axion models is conceivable with 80 disks of 1 m$^2$ area contained in a $10$ Tesla field. 
The MADMAX Working Group: Allen Caldwell, Gia Dvali, Bela Majorovits,   Alexander Millar, Georg Raffelt, Javier Redondo, Ola...
physics.ins-det astro-ph.CO astro-ph.HE hep-ex hep-ph