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Q: Fachverband Quantenoptik und Photonik

Q 51: Precision Measurements

Q 51.4: Talk

Thursday, March 9, 2023, 15:15–15:30, A320

The Photon-Per-Day Detection System of the ALPS II Experiment — •Daniel Brotherton for the ALPS II collaboration — University of Florida, Gainesville FL, U.S.

Axions and axion-like particles are a class of particles extending the Standard Model. The Any Light Particle Search II (ALPS II) will soon begin its first science run to probe their miniscule interaction with light. ALPS II follows the ``light shining through a wall'' approach. Laser light directed through a magnetic field towards a wall may convert into axions and cross unimpeded. On the opposite side, the axions may reconvert to light amidst another magnetic field and be detected. With respect to ALPS II's design parameters and target sensitivity, a detector is required capable of resolving on the order of a photon per day over a 20-day measurement run. In this talk, I will introduce ALPS II's heterodyne interferometric detection scheme. I will discuss the characterization of the detector scheme's noise background and the amount of stray light leaked into the reconversion region.

This work is supported by NSF grant PHY-2110705 and Heising Simons foundation grant 2020-1841.