Dear Jergen,
If your lock is still working, my guess is that it is weaker than normal
because you have locked onto a sideband about 100 kHz away. If the shimming
is really bad then maybe you had a cryoshim quench. If you cannot get lock then
maybe H0 coil is disconnected. The most likely place for this is at the bottom
of the RT shim insert of the magnet. In such a case, it can often be fixed by
removing the RT shims, opening the bottom and soldering the broken wire. I hope
that your problem is the first one because that is the easiest to fix.
Yours,
Roy Hoffman
Hebrew University.
Received on Thu Nov 16 2000 - 09:31:42 MST