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GR: Fachverband Gravitation und Relativitätstheorie
GR 14: Gravitational Waves II
GR 14.3: Talk
Thursday, March 23, 2023, 16:40–17:00, ZEU/0255
A Cryogenic Displacement Sensor and Actuator for the Einstein Telescope — Thomas Hebbeker1, Robert Joppe1, •Tim Kuhlbusch2, Oliver Pooth2, Purnalingam Revathi2, Achim Stahl2, Timo Wittler1, and Franz-Peter Zantis1 — 1III. Physikalisches Institut A, RWTH Aachen — 2III. Physikalisches Institut B, RWTH Aachen
The Einstein Telescope will be the first third-generation gravitational wave detector. In achieving an increase in sensitivity of more than one order of magnitude at low frequencies compared to current detectors, mitigating thermal noises is essential. Thus cooling the mirrors of the interferometer to cryogenic temperatures is required. Consequently parts of the vibration isolation systems of the mirrors need to be working at these low temperatures.
This talk will present the developement of an actuator with an integrated absolute displacement sensor operating below 20 K. Sensitivity of the sensor, forces of the actuator and thermal design will be discussed. This includes the effects of cryogenic temperatures on diodes of the sensor and the electromagnet of the actuator.