Helium temperatures in a four‐circle neutron diffractometer
作者:
I. R. Herbert,
S. J. Campbell,
期刊:
Journal of Applied Crystallography
(WILEY Available online 1977)
卷期:
Volume 10,
issue 1
页码: 18-20
ISSN:1600-5767
年代: 1977
DOI:10.1107/S0021889877012710
出版商: International Union of Crystallography
数据来源: WILEY
摘要:
The cooling of single‐crystal samples to helium temperatures within a four‐circle neutron diffractometer has been achieved by a novel continuous‐flow system. The system relies solely on helium for its cooling power with two flow circuits being used. The first delivers liquid to a reservoir cryostat of capacity 1–4 l located close to the Eulerian cradle of the diffractometer and the second draws the refrigerant from this cryostatviaa flexible transfer tube into the sample region of a compact cooling unit mounted off the cradle. This arrangement allows unhindered motion of the diffractometer circles for sample temperature operation in the range 3.9–300 K. The system requires a total helium flow of 1.0 l h−1to maintain a temperature of 20±0.1 K, decreasing to 0.5 l
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