An automatic low-temperature system for the neutron four-circle diffractometer is described. The crystal specimen is cooled with a stream of cold nitrogen gas obtained from boiling liquid nitrogen. Cold gas is then warmed to room temperature to facilitate the control of the gas flow without cryogenic components, and recooled by passing it through a heat exchanger immersed in the liquid nitrogen. Techniques for the automatic refilling of the cold gas generator and for preventing ice formation on the crystal are presented. Any desired temperature in the 100-300 K range can be achieved. Performance of the system is discussed.
|Place of Publication||Roskilde, Denmark|
|Publisher||Risø National Laboratory|
|Number of pages||18|
|Publication status||Published - 1973|
|Series||Denmark. Forskningscenter Risoe. Risoe-R|
- Risø report 279