Von meinem iPad gesendet
Am 21.06.2024 um 21:25 schrieb Spin-Doc <bert.heise_at_spin-doc.net>:
Hi Luke,
there may be another possible solution (bit more drastic, but here you go):
In case the installation of the new NMR system isn't too far away anymore
you could also just quench the old magnet yourself - being unshielded it's
rather unlikely that it will find a new home (unless you do have such plans
for it of course). Quenching a magnet - specifically an older one which has a
readily accessible vacuum valve - is shockingly easy…
Yes - this is working fine. There is a closed cap on before the valve to
the vacuum chamber. We opened the cap - closed it and opened the valve.
Closed the valve - opened the cap vented the small volume there and then
closed this part with a cap and opened the valve to the vacuum once more again.
You have to do this 10 or more times.
This takes time - but the vacuum is with this method slowly broken down.
after a while the quenching vents are opened by the magnet itself - the quench
is happening now.
In our case - we tried to recover as much as possible of the liquid helium.
So we tried to vent the main stuff in to our recovery system. Before all this -
the main bladder was completely emptied and during the quench the recovery system
went on maximum. Even we tried to put more into our recovery system and put a
screw driver over the quenching vents and press this one a bit down - venting
into the recovery hose. This was the final end of my 9.4 Tesla Oxford magnet.
Bert is right - its working.
Yours sincerecly,
Ulrich Haunz
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Received on Wed Jun 26 2024 - 05:58:07 MST