Abstract
A new generation of gravitational wave interferometers is under study with the main goal to improve the sensitivity of the present detectors which are taking data now. Two of the dominant noises which limit the actual sensitivity of the interferometers are the thermal noise of the suspended optics and the thermal lensing process. At low temperature it is possible to reduce both the effects. However, lowering the temperature of the test masses without injecting vibration noise from the cooling system is a technological challenge. We present the first results on a new active system to dampen the vibrations from a pulse tube refrigerator coupled to a suspended mirror.
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