One example of using our cryogenic probes is to monitor the effectiveness of magnetic shielding during experiments to measure weak interactions between neutrons and superfluid helium*.

A cryostat maintains superfluid helium at the required temperature of 4.2K. The experimental procedure requires magnetic fields within the cryostat to be kept to a minimum to prevent the weak force interactions on the neutrons being obscured by spin induced from any magnetic fields.

In this way, only the weak interaction is observed. This configuration contains three layers of magnetic shield. The smallest layer of shielding and the probe are positioned around the experimental apparatus within a cryostat and the equipment is used to monitor fluctuations in the magnetic field within the cryostat and feed back into a degaussing system in the shielding.

You can read more about this application in our Application Note AN0029.

See also our range of Space Products.

* Tasson J D 2002 Magnetic Shielding for an Experiment to
Measure the n – 4He Weak Interaction,
Northern Michigan University