ALPS II: The next generation light shining through a wall experiment

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• Guido Mueller, University of Florida
• Wednesday 19 August 2020, 14:00-15:00
• online .

If you have a question about this talk, please contact Silvia Toonen.

The QCD axion, originally invented to solve the CP problem in the standard model, is also a strong contender to form the omnipresent dark matter in our universe. Lately, axion-like particles emerged as potential explanations for unsolved puzzles in astronomy and astrophysics such as the cooling rate of stars or the TeV transparency. These hints point towards an axion-photon coupling factor in the 10^(-11)/GeV range. The Xenon-1T excess electronic recoil events might be caused by solar axions with a similar coupling factor. This is the range the next generation light shining through a wall (LSW) experiment, ALPS II , will probe. LSW experiments have the unique strength that they do not rely on any external axion flux but generate the detected axions themselves. Hosted by DESY , ALPS II will use two 120m long strings of HERA dipole magnets, high power laser systems and optical cavities to surpass the photon regeneration rate of earlier LSW experiments by many orders of magnitude. I will report on the status of ALPS II , discuss the complex sensing and control scheme to operate the detector as well as our signal verification and veto channels.

This talk is part of the Astrophysics Seminars series.

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