Abstract
We study the feasibility of a new generation axion helioscope, themost ambitious and promising detector of solar axions to date. Weshow that large improvements in magnetic field volume, x-rayfocusing optics and detector backgrounds are possible beyond thoseachieved in the CERN Axion Solar Telescope (CAST). For hadronicmodels, a sensitivity to the axion-photon coupling ofgaγ ≳ few × 10−12 GeV−1 isconceivable, 1–1.5 orders of magnitude beyond the CAST sensitivity.If axions also couple to electrons, the Sun produces a larger fluxfor the same value of the Peccei-Quinn scale, allowing one to probea broader class of models. Except for the axion dark mattersearches, this experiment will be the most sensitive axion searchever, reaching or surpassing the stringent bounds from SN1987A andpossibly testing the axion interpretation of anomalous white-dwarfcooling that predicts ma of a few meV. Beyond axions, this newinstrument will probe entirely unexplored ranges of parameters for alarge variety of axion-like particles (ALPs) and other novelexcitations at the low-energy frontier of elementary particlephysics.
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