Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 38: Search for New Particles 3

T 38.2: Vortrag

Dienstag, 22. März 2022, 16:30–16:45, T-H23

The ALPS II experiment at DESY - Status and prospects — •Kanioar Karan for the ALPS collaboration — DESY / Cardiff University, Hamburg, Germany

The Any Light Particle Search II (ALPS II) is a laboratory-based light shining through a wall experiment (LSW) to probe the existence of Axion-Like-Particles (ALPs) with a coupling to electromagnetic fields as low as g_aγγ ≈ 2×10⁻¹¹GeV⁻¹ that is hinted at some astrophysical anomalies such as stellar evolutions and the TeV transparency of the universe. This LSW experiment is based on the simple idea that a high power laser field that propagates through a static magnetic field can partly oscillate into an ALP field. The ALP field then crosses an opaque wall to a second static magnetic field and can partly re-oscillates into an electromagnetic field which can be detected with a detector. In order to achieve the anticipated sensitivity, two 125m long optical cavities, operated in a vacuum system, are used: one with an expected circulating power of 150kW for the ALPs production and one with an expected power build-up of 40,000 to enhance the regeneration of the electromagnetic field. The circulating field in each cavity is directed through a string of 12 superconducting HERA dipole magnets providing a magnetic field of 5.3T. The ALPS II experiment is located at DESY in Hamburg and is currently in the commissioning phase. In this talk, we will present the current status, challenges and perspectives of the ALPS II experiment with the focus on the optical setup.