Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 118: Gravitational waves 2

T 118.4: Talk

Friday, March 8, 2024, 09:45–10:00, Geb. 30.23: 6/1

A Cryogenic Actuator and Position Sensor for the Einstein Telescope — Charlotte Benning², Thomas Hebbeker¹, Robert Joppe¹, •Tim Kuhlbusch², Oliver Pooth², Achim Stahl², and Franz-Peter Zantis¹ — ¹III. Physikalisches Institut A, RWTH Aachen University — ²III. Physikalisches Institut B, RWTH Aachen University

Thermal noise at room temperature would limit the sensitivity of future gravitational wave detectors in the lower frequency region. Cooling the optical components of the interferometric detector reduces the thermal noise but adds constraints for their suspension system. The Einstein Telescope, a foreseen next-generation European gravitational wave detector, requires an operating temperature below 20 Kelvin.

This talk will present the development of an actuator with an integrated absolute displacement sensor optimized for these temperatures. The sensitivity of the sensor and range of the actuator must be maintained at low temperatures while reducing produced heat. Measurements of all optical components of the sensor were performed to optimize the cryogenic performance. The produced heat was analysed and options to reduce the thermal load will be discussed.

Keywords: Cryogenic; Actuation; Sensing; Gravitational Wave Detectors; Einstein Telescope