SKM 2021 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 2: Vacuum technology: New developments and applications

VA 2.2: Hauptvortrag

Montag, 27. September 2021, 12:15–12:45, H2

Current design status and outgassing considerations for the vacuum system of the Einstein Telescope — •Katharina Battes, Christian Day, and Stefan Hanke — Karlsruher Institut für Technologie, Eggenstein-Leopoldshafen, Deutschland

As third-generation, underground gravitational-wave observatory the Einstein Telescope is currently being planned in Europe. In order to enhance sensitivity compared to the current detectors as well as to expand the frequency band to lower frequencies, the length of the vacuum pipe arms will be increased to 10 km and the main optics will partly be cooled to cryogenic temperatures below 20 K.

Designed as an equilateral triangle, the Einstein Telescope will consist of six laser interferometers, which require high to ultra-high vacuum conditions. As especially residual gases like water can cryosorb as frost on the cryogenic mirror surfaces and thus degrade its optical performance, this frost formation has to be mitigated by properly designing the cryostat and additional pumping as well as considering the outgassing characteristics of the room temperature parts.

Therefore, potentially relevant materials are investigated at the Outgassing Measurement Apparatus, which uses a modified throughput method. As a result, besides total outgassing rates, information on the outgassing species are determined by a mass spectrometer.

This paper describes the current design of the Einstein Telescope vacuum system and evaluates materials and possible pre-treatments with respect to their potential application based on optimized outgassing characteristics.