Abstract
We report results from three pulse tube coolers used at around 60 K. All of them were successfully driven in vacuum conditions and showed similar cooling capabilities with flight Stirling and pulse tube coolers. Vibrations at cold heads and linear compressors have been measured and their displacements were revealed to be less tan 10 μm in x, y and z directions. They imply that vibration form the compressor must be dominant in 'integrated' pulse tube coolers.
