LIGO Document G1900526-v1

Improving the Cool-down times for Third Generation Gravitational Wave Observatories (LVC)

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The results of the prototype at stanford show that with a pressure of 30 mtorr gaseous nitrogen and a 1 mm gap between the cold shroud and the test masses we can improve the cooldown rate by a factor of 3.5, compared to radiation only cooldown.

The results of our experiments can be estimated within the 10% level of accuracy using the semi-empirical Sherman-Lees interpolation formula for heat conduction in rarefied gases.

This method for fast cooldown/warmup iterations can be of use for third generation GW obsevatories.

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