SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Precision Measurements

Q 51.3: Vortrag

Donnerstag, 9. März 2023, 15:00–15:15, A320

Characterization of the Optical Systems in the ALPS II Experiment — •Todd Kozlowski for the ALPS II collaboration — DESY, Hamburg, Germany

The Any Light Particle Search II (ALPS II) is a "light-shining-through-the-wall" particle search experiment at DESY, currently in its final preparations for a science run. ALPS II will probe for axions and axion-like particles, a family of hypothetical particles outside of the Standard Model, to a sensitivity unparalleled by other model-independent, laboratory-based experiments and most other broadband experiments. ALPS II aims to detect light which has undergone photon-axion and subsequent axion-photon conversion in the presence of a magnetic field. In the initial design, a 60 W laser provides a constant flux of photons for conversion. Opposite a light-blocking shutter, a 122 meter long, high finesse 'regeneration cavity' increases the reconverted signal rate. The resulting ultra-weak signal field can then be detected using optical heterodyne interferometry. In this presentation, I will characterize our optical and control systems in the context of the requirements for the first science measurement. These results will include the performance of the very long storage-time regeneration cavity and the position and phase stability of the fields on the experiment's central optical breadboard.

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