Oxford Intruments 3He Sorption Cryostat

HEOX is a 3He cryostat with a sorption 3He pump. All gas handling is inside the cryostat, there are therefore no tubes to a pump outside.

After putting into operation, some questions are still open:

• The sample space has a diameter of about 40 mm. Around this tube, there is 4.5 mm liquid helium. This may produce background, especially on inelastic measurements.

• In principle, it should be possible to combine the 3He insert with the MA09 cryomagnet. It is not yet clear, if it really works, and there will also be the problem with the LHe background.

• For powders, it is not clear if the thermal contact inside the sample container is good enough to ensure the expected sample temperature.

Some test results

Hold times: