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

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Abstract
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 low-loss 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

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