Cryostats and Mechanical Stage for Nuclear Magnetic Resonance Studies

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Abstract
Cryostats for use with liquid helium and other coolants providing temperatures in the range 77° to 600°K constant to within ±1° are described. These are designed to provide a self‐contained probe with the facility of interchanging different radio‐frequency coils. The rf coil is so mounted that it keeps the sample free from condensation of moisture at low temperatures and facilitates changing of samples without disturbing its position in the homogeneous region of the magnetic field. A mechanical stage which locates this region and clamps the probe in this position is also described. It reproduces this setting quickly and is particularly useful for high resolution studies. A new method of setting up the mechanical stage with the cryostat, the magnet, and the oscillator provides a compact assembly with considerable ease in their operation and allows the use of a very short coaxial cable (about 6 in.) for connecting the rf coil to the oscillator. This considerably improves the signal‐to‐noise ratio.

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