magnet quench
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Uploaded by mrwideboy on Jan 25, 2008
I quenched this magnet as it was to be moved This was done under controlled conditions by opening the vacuum valve. The magnet was an 360 MHz Oxford d15000 and the gas being vented is helium just above 4 kelvin
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Most NMR spectroscopists wait their whole lives to witness a magnet actually quenching, which is why I can't believe this isn't ranked higher! Very cool vid. I was just searching for it on a whim while doing a weekend T1 study on our 600; did NOT expect to actually find one on youtube! Thanks for the post!!
3 years ago 6
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It seams like a waste of LHe....you could not transfer the liquid helium back to the LHe supply dewar?
Carl
2 years ago 2
All Comments (35)
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Shouldn't there be raining oxygen
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All Helium eventually leaves Earth atmosphere and fills the universe. Also Hydrogen leaves from the upper atmosphere into empty space. Those two gasses cannot be held back by Earth gravitation.
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nice to see this done in a controlled manner.
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@sugarkandee1 I would say the exact opposite. Most NMR operators never want to see a quench, especially with a 10T magnet or stronger. It's not a guarantee the magnet will come back or be stable again.
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this is slightly more fun then watching paint dry, ill have to look up what "magnet quenching" is.
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4 kelvin :D
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I have an 8T magnet that I need to quench. Do you have any advice and/or resources that you can share?
sslasergirl 8 months ago
@sslasergirl, first of all do it safely, make sure you are aware of the hazards like oxygen and a quick exit, but the safest way is to de-energise the magnet first to vent the vacuum to atmosphere find the actuator/ magnet valve and speedy valve so you can control the N2 flow into the vacuum chamber, and use t piece and one value because when you break the vacuum you can overpressure the magnet chamber. I deally it should be opened slowely and carefully
mrwideboy 8 months ago
what current or voltage is fed to the coils so they won't get damaged during the quench?
I've always wanted to see a magnet quench, yay :)
touge242 2 years ago
Normally they are protected by either internal diodes to limit the voltage, sometimes resistors, it mainly to protect the superconducting switch
mrwideboy 2 years ago