Do any one has the experience on quenching of 400 MHz NMR magnet? In our laboratory, there is an accident. We don't know the actual reason. The quenching time is about 5-6 minutes. What kind of collision on the magnet could induce such quenching? I could find no physical damage on the magnet. Do any one has the idea about the issuse?
--Try reposting to sci.physics.electromag
The boiloff of cryogens may haver taken 5-6 minutes, the actual quenching of the magnetic field goes pretty quickly, probably less than a second.
It doesn't require a collision of anything with the magnet. Sometimes a flaky magnet will quench with just movement of nearby equipment that affects the field (not so likely with an NMR magnet as with a medical MRI magnet). And, of course, the biggest reason for quenches is the loss of cryogens due to laziness, trouble with the cryogen level indicator or an ice bridge.
Jon
What was the field that the magnet quenched at, and what is it's maximum rated field?
Is this a new installation, and was the magnet trained up at the field it quenched at?
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