Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 12: Search for New Particles I
T 12.3: Talk
Monday, March 15, 2021, 16:35–16:50, Tl
TES Detector for ALPS II — •Rikhav Shah1, Katharina-Sophie Isleif2, Friederike Januschek2, Axel Lindner2, and Matthias Schott1 for the ALPS collaboration — 1JGU Mainz — 2DESY, Hamburg
The Any Light Particle Search II (ALPS II) is a light-shining-through-a-wall (LSW) experiment at DESY, Hamburg, attempting to detect axions and axion-like-particles (ALPs). ALPS II will convert photons into axions/ALPs in an optical cavity. After passing through an opaque, light-tight barrier, these particles enter another optical cavity. Here, they can reconvert to photons and be detected. The detection requires a sensor capable of observing the extremely low rates of O(10−5) Hz, necessitating a very low dark rate and high detection efficiency. This can be achieved by using a TES, a Transition Edge Sensor, which is a cryogenic calorimeter exploiting the drastic temperature dependence of a material’s electrical resistance in its transition region. We present the setup of a TES detector for ALPS II, its current status, and the analysis and improvement of its backgrounds. The viability and outlook of such a detector for the ALPS II experiment will be discussed, including future steps to understand its backgrounds and measure the detection efficiency.