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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 produces background,
especially on inelastic measurements. A test on TASP? shows
background count rates of the order of 40 counts/min. which seems
to be inacceptable.
- 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:
minimum T | 0.33 K | 22h |
| 0.5 K | 25h |
| 0.7 K | 32h |
Attachments:
he3ontasp.gif
helium3a.jpg
This particular version was published on 28-Apr-2005 09:30:49 UTC by MarkusZolliker.
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