Thank you all for very supportive comments about slow quench, and for
recommended contacts, I'll compile these replies and post it. Currently we
are regularly feeding our greedy magnet with LHe, and waiting for Bruker
engineers.
Trying to understand the reasons for the quench I was thinking about
different (may be crazy?) possibilities. Any idea what effect the ice (if
any) at the bottom of transport dewar might have on process of LHe refill?
Are there any loose ice particles (floating or submerged?) in helium, which
can block transfer line after a while, and how it can be recognized? I have
no idea how ice at the bottom of the dewar should look like or behave. Any
experiences? Once I was not able to insert transfer line in a He dewar
which had been just delivered (it was completely blocked with frozen air,
after some warming up with He gas using the same transfer line everything
was finally ok).
Thanks,
Alex
--
Dr. Alexander P. Golovanov
Department of Biomolecular Sciences
University of Manchester Institute of Science & Technology (UMIST)
P.O.Box 88,
Manchester M60 1QD
Tel. No: ++44 (0) 161 200 5814 Office
++44 (0) 161 200 5812 NMR room
Fax. No: ++44 (0) 161 236 0409
e-mail a.golovanov_at_umist.ac.uk
Received on Fri Mar 15 2002 - 19:02:00 MST