Vibration reduction for stirling cryocooler system

We undertake to build a new cross dispersed infrared spectrograph, whose design is a heritage of IGRINS, will be deployed at Gemini Telescope as facility instrument (IGRINS II). The Sunpower Cryotel GT cryocooler may be replaced with the current GM cooler in the future. The only drawback of using a stirling cryocooler is vibration and this may have a significant influence to astronomical instrument by decreasing the signal to noise ratio. On this test the induced vibration in all three axes were measured simultaneously on the external cyrostats bottom and internal cold stage linked to coldhead by a flexible thermal strap. The cryocooler was integrated with a compliant mount of the neoprene rubber or spring. The test was carried out with both the tuned vibration absorber (TVA) damper and active vibration cancellation (AVC) unit, when the temperature of cold stage went down to 70 K.