Cryogenics and Einstein Telescope

Details Cryogenics and Einstein Telescope Cryogenics and Einstein Telescope

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gregr..43..657p&link_type=abstract

General Relativity and Gravitation, Volume 43, Issue 2, pp.657-669

Mathematics

Logic

Gravitational Wave, Cryogenics

Scientific paper

The dominant noises which limit the present sensitivity of the gravitational wave detectors are the thermal noise of the suspended mirrors and the shot noise. For the third generation of gravitational wave detectors as the Einstein Telescope (ET), the reduction of the shot noise implies to increase the power stored in the detector at 1 MW level and, at the same time, to compensate the huge optic distortion due to induced thermal lensing. At low temperature it is possible to reduce both these effects. However, lowering the temperature of the test masses without injecting vibration noise from the cooling system is a technological challenge. We review here the thermal noise impact on the ultimate ET sensitivity limit and we discuss possible cryogenic configurations to cool the mirror.

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