A helium-flow cryostat (3 to 300 K) for neutron four-circle spectrometry

2014 We describe a continuous-flow cryostat system with spherical geometry and full 360° freedom of motion for all three Euler angles. The cryostat does not increase the dead angular zones of the Euler-cradle itself. Any sample temperature between 3 K and 300 K can be set and kept gradient-free and constant by a computer controlled temperature regulation. The time constant of the device is in the range of a few minutes, even at higher temperatures. These performances are obtained with a reasonable helium consumption owing to a special lowloss transfer line with magnetically suspended helium ducts. The device has been operated routinely at the ILL for five years for a variety of solid state studies. Revue Phys. Appl. 19 (1984) 789-791 SEPTEMBRE 1984,