Hi Luke,
One note of caution. We’ve done this with Oxford magnets. In one case
there had apparently been a slow leak into the vacuum over the years. And so
when it finally warmed up and the N2 and O2 ice vaporized. The pressure built
up and blew the drop off plate off. Created a cloud of aluminized mylar snow.
No one was hurt, but it did scare the janitor. Note that the drop off plate did
not drop off because the O-ring had turned into glue or the ice had sealed the
plate off.
My recommendation would be, once the field is gone, to open the vacuum value.
If you want to keep it clean for possible future use, back fill the vacuum with
dry N2 and put a pressure relief valve on it during warm up.
Jeff
On Jul 26, 2024, at 4:48 PM, dennisonpr via groups.io wrote:
Hi Luke,
When I have done this in the past, I used use short jumper leads with crocodile
clips to connect the pins on the magnet connector to a 9V battery. Having already
connect a resistive load to dump the current, of course. The pin outs were all
listed in the magnet manuals.
Regards,
Phil Dennison
On 20240726 14:02, Fulton, Luke wrote:
Hi All,
We have an unshielded 400 MHz Spectrospin magnet that we're preparing to
decommission. Our initial plan was to induce a quench either by opening the
vacuum seal, or cease nitrogen fills and let boil off handle the rest. After
speaking with a magnet engineer we think our lab layout slightly too crowded
for that approach; this magnet's stray field could distort outwards during
an "uncontrolled" quench. We're now considering using the charging rods to
deenergize more gently. Trouble is, something's gone missing since the magnet
was installed in 1995. We have both rods, diode, and a battery for cycling
down, but we don't have anything (pin outs?) to connect rods to battery. Is
anyone willing to loan us a compatible set of connectors/adapters/power-source?
If you're in the New England area we could come in person and save you the
trouble of mail.
Spectrospin
400 MHz / 52 mm
Coil No. : BZH 160 ' 40 ' 67 A
Dewar No. : D 105 / 52 / 2219
Kind regards,
Luke
Luke Fulton, PhD
CHEM BLDG R003
NMR Core Facility Director
Unit 3060
COR2E & Department of Chemistry
55 N Eagleville Road
University of Connecticut
Storrs, CT 06279
email: fko24003_at_uconn.edu<mailto:fko24003_at_uconn.edu>
(alias): luke.fulton_at_uconn.edu<mailto:luke.fulton_at_uconn.edu>
mobile: (603) 953-5275
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Received on Sat Jul 27 2024 - 05:26:45 MST