Date: Mon, 19 May 2014 09:51:36 -0600
Hi Jay,
If it is truly a Chemagnetics magnet then I could help you. On the
Chemagnetics Magnet, the helium sensor is down in stack #1 and you fill on
stack #2. When you fill via stack #2, you need to pull up the transfer line
greater than a 1/4 inch or so. This way you will not be pushing liquid
helium (which requires more pressure) to the bottom of the dewar depicted
here in purple. In your case, it sounds like you have blockage in one or
both stacks which doesn't allow you to fill and vent normally. When you look
down the stacks, what do you see? If its white ice that's better than
translucent ice which is frozen water. The process of clearly the stacks
involves using warm helium gas and may also involve pressurizing the helium
can. I have done this procedure several times and I have the equipment and
also currently the time. If you are interested, I could come to your site,
please reply back to discuss this further.
Kevin Geohring
Global Services Manager
2416 Donella Court, Unit B
Fort Collins, CO 80524
Phone: 970-493-6600
Fax: 970-416-8896
<mailto:keving_at_revolutionnmr.com> keving_at_revolutionnmr.com
<http://www.revolutionnmr.com/products.shtml> Our Solid State Products and
On-line Store
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From: Shore, Jay [mailto:Jay.Shore_at_SDSTATE.EDU]
Sent: Sunday, May 18, 2014 9:40 AM
To: ammrl_at_ammrl.org
Subject: AMMRL: chemagnetics magnet
We a chemagnetics magnet energized to 100 Mhz (but I do not know if that is
the field that it was designed for) and are having trouble filling He. It
seems like very little accumulates inside the magnet. We have tried twice to
fill it, each time for about an hour. The first time we got it to go from
56% to about 75%. The second time we did not see any increase. We pumped
down the transfer line and assume that it is okay. I borrowed a fiber optic
device to look down the port we do helium fills, but I am not sure what to
expect. I see a ring of ice on the wall of the tube a couple of feet down,
but it does not block the tube. At the end of the tube I see something white
but am not sure what it is. We think that there may be an ice block
somewhere inside the helium dewar.
Am I missing anything?
Does anyone have a manual for this magnetic? - I can email a picture if that
helps.
Does this sound like an ice blockage?
I would appreciate any help or advice.
Jay
-- Jay Shore Department of Chemistry and Biochemistry South Dakota State University Brookings, SD 57007
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