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T: Fachverband Teilchenphysik

T 77: Axion like particles II

T 77.1: Gruppenbericht

Donnerstag, 2. April 2020, 16:30–16:50, H-HS XV

Any Light Particle Search II Overview and Status — •Richard C G Smith for the ALPS collaboration — DESY, Hamburg, Germany

The Any Light Particle Search II (ALPS II) is an experiment that will search for hypothesized axion-like particles using a light-shining-through-a-wall approach. These kinds of experiments generate axion-like particles from photons in a strong magnetic field, let the particles pass through a wall which blocks the photons, and then detect the photons regenerated from another strong magnetic field after the wall. The experiment is located at DESY in Hamburg which gives us access to infrastructure used in the HERA accelerator, such as tunnels, magnets, and cryogenics. In order to achieve the novel sensitivities planned we will use two 125 m long cavities housed in a vacuum system: one with 150 kW of circulating optical power to generate the axion-like particles, and one with a power build-up factor of 40,000 to resonantly enhance the probability of regeneration into photons. Both of these cavities will be located in a 5.3 T magnetic field provided by superconducting dipole magnets. ALPS II is currently being installed and we expect data collection to begin in 2021. This talk will provide the current status of the experiment, an explanation of the light-shining-through-a-wall concept, and a brief discussion of some of the technologies being used.