On Thu, 1 Jun 2000, Valerie Robinson wrote:
> Second - we're trying to come up with a realistic budget for LN2 and LHe.
> The new magnets quote specifications for LN2 hold times greater than 21
> days (230 l) for the 500 wide bore and 17 days (163 l) for the 600 narrow
> bore. I'm interested to know how many of you are routinely filling these
> magnets only every other week - I've been filling weekly for so long it's
> hard to imagine.
We have an Oxford 400 MHz from 1997 which we refill routinely every other
week with no problems.
> As for helium, I'm getting pressured to take the magnets to 20 %. The 600
> spec is 130 days, refill volume 125 l, total volume 159 l. I am extremely
> reluctant to take the magnets this low - I'd really appreciate some input
> on this.
We have done the refill of the above magnet at about 25%, twice. No
problems. The holding time is 1 year.
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Eugenio Alvarado Tel: 207-4106
Escuela de Quimica
Universidad de Costa Rica
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Received on Thu Jun 01 2000 - 18:41:16 MST