This CCR is different from all of the other systems at the NCNR. Instead of using the Gifford-McMahon process diagramed on the main CCR page it uses a slightly different process achieved through a radically different approach. In an effort to reduce the amount of maintenance and vibrations in a standard CCR a pulse tube uses no moving parts in the cold head. This means there is no displacer, seals or control hardware to wear out and require maintenance. Instead the pulse tube uses an acoustic standing wave in a pulse tube, hence its name. There are other differences in the actual process than simply the mechanics, or lack there of, but that is beyond this discussion. Unlike all other CCRs this system is permanently installed at BT-1 becuase of its size and the availability of cooling water needed to cool the compressor.
|System Description||Temperature Range (K)||Manufacturer||Available Instruments||System Drawing||PID Zone Table||Notes|