Cryogenic payloads for the Einstein Telescope: Baseline design with heat extraction, suspension thermal noise modeling, and sensitivity analyses

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Abstract
The Einstein Telescope (ET) is a third-generation gravitational wave detector that includes a room-temperature high-frequency (ET-HF) and a cryogenic low-frequency laser interferometer (ET-LF). The cryogenic ET-LF is crucial for exploiting the full scientific potential of the ET. We present a new baseline design for the cryogenic payload that is thermally and mechanically consistent and compatible with the design sensitivity curve of the ET. The design includes two options for the heat extraction from the marionette, based on a monocrystalline high-conductivity marionette suspension fiber and a thin-wall titanium tube filled with static He-II. Following a detailed description of the design options and the suspension thermal noise (STN) modeling, we present the sensitivity curves of the two baseline designs, discuss the influence of various design parameters on the sensitivity of ET-LF, and conclude with an outlook to future R&D activities.
Funding Information
  • Bundesministerium für Forschung, Technologie und Raumfahrt (Gr 05A20VK4)
  • Karlsruhe School of Elementary Particle and Astroparticle Physics: Science and Technology, Karlsruhe Institute of Technology
  • H2020 Marie Skłodowska-Curie Actions (734303)
  • Italian PRIN Program
  • Italian Ministry for Universities and Research

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