Detailed design of a resonantly-enhanced axion-photon regeneration experiment
van Bibber, Karl
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A resonantly-enhanced photon-regeneration experiment to search for the axion or axion-like particles is described. This experiment is a shining light through walls study, where photons travelling through a strong magnetic field are (in part) converted to axions; the axions can pass through an opaque wall and convert (in part) back to photons in a second region of strong magnetic field. The photon regeneration is enhanced by employing matched Fabry-Perot optical cavities, with one cavity within the axion generation magnet and the second within the photon regeneration magnet. Compared to simple single-pass photon regeneration, this technique would result in a gain of (F/ )2, where F is the finesse of each cavity. This gain could feasibly be as high as 1010, corresponding to an improvement in the sensitivity to the axion-photon coupling, ga , of order (F/ )1/2 300. This improvement would enable, for the first time, a purely laboratory experiment to probe axionphoton couplings at a level competitive with, or superior to, limits from stellar evolution or solar axion searches. This report gives a detailed discussion of the scheme for actively controlling the two Fabry-Perot cavities and the laser frequencies, and describes the heterodyne signal detection system, with limits ultimately imposed by shot noise.
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