Low-vibration cryogenic test facility for next generation of ground-based gravitational-wave observatories
We present the design and commissioning of a cryogenic low-vibration test facility that measures displacement noise from a gram-scale silicon cantilever at the level of 10$^{-16}\, \mathrm{m/\sqrt{Hz}}$ at 1kHz. A volume of $\sim$36 litres is enclosed by radiation shields cooling an optical test cav...
Saved in:
Main Authors | , , , , , |
---|---|
Format | Journal Article |
Language | English |
Published |
19.08.2024
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We present the design and commissioning of a cryogenic low-vibration test
facility that measures displacement noise from a gram-scale silicon cantilever
at the level of 10$^{-16}\, \mathrm{m/\sqrt{Hz}}$ at 1kHz. A volume of $\sim$36
litres is enclosed by radiation shields cooling an optical test cavity that is
suspended from a multi-stage pendulum chain providing isolation from acoustic
and environmental noise. This 3kg test cavity housing a crystalline silicon
cantilever is radiatively cooled to 123K in 41 hours and held at that
temperature over many months with a relative temperature stability of $\pm$1mK.
The facility is capable of interferometrically measuring temperature-dependent
broadband displacement noise between 50Hz and 10kHz where current and future
ground-based gravitational wave observatories are most sensitive. With suitable
cantilever design, the cryogenic facility we describe here will allow for the
measurement of broadband thermal noise in crystalline silicon at 123K. This
will guide the design of suspensions in planned future cryogenic ground-based
gravitational-wave detectors such as LIGO Voyager and the Einstein Telescope.
This facility is also suitable for the testing of new mirror coatings at
cryogenic temperatures. |
---|---|
DOI: | 10.48550/arxiv.2408.10477 |