Here at Georgia State University we have performed such a cold move last June, 2015. A Bruker AV400 magnet is moved from 2nd floor to first floor in the same building. It cost one day to do the move and a couple of days to recalibrate and get things back to normal. The magnetic field keeps drifting for ~2 months. So I will need to calibrate each week for a few weeks after the move. The procedure will be like this:
1. Order 100-200L liquid helium. A Bruker engineer will need to come and discharge the magnet;
2. Use an aluminum tripod that holds 1 ton or more to lift up the magnet. The is rented from Bruker and included in the total charge. Take the legs off the magnet and put the magnet into a box with sponges and then into a fork lift cart that can be used for transfer between buildings.
3. We moved from 2nd floor to 1st floor using the elevator since the magnet is now discharged. If you need to move between buildings, you will need to take extra care since you want to keep the magnet undisturbed as much as you can. Too much shaking will be problematic. If you are moving between two buildings, depending on the road condition between the two buildings, Bruker may want to quote this as cold move or may not. This depends on the probability of causing quenching during the movement.
4. After relocation, use the tripod to lift the magnet and then install the legs back. After liquid helium fill, the magnet will be recharged. You may need liquid helium refill during this recharging process. Normally you will need 100-200L helium for cold move for magnet is this size. For us, 100L proved to be enough in this move and we used the rest for our 500 and 600;
5. The instrument performs same as usual after 2 months and then just routine maintenance is needed.
Hope this helps.
Jimmy
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Jimmy (Zhenming) Du, Ph.D.
Department of Chemistry
P.O.Box 3965
Georgia State University,
Atlanta, GA 30302-4098
Phone: 404-413-5538
Email: zdu_at_gsu.edu
http://sites.gsu.edu/zdu/
-----Original Message-----
From: Ma, Dejian [mailto:dma6_at_uthsc.edu]
Sent: Tuesday, March 15, 2016 5:09 PM
To: ammrl_at_ammrl.org
Subject: AMMRL: 400MHz magnet 'cold move' between two buildings
Dear all,
We plan to move a relatively new 400MHz Bruker magnet (installed 2011) through 'cold move', between two buildings that are about 100 meters apart. Could you please share your experience on this if you have done it recently? The more details, the better.
One thing in particular, the road between the two buildings is a little bumpy. what kind of transportation equipment will be best for the transport?
This email list is a great resource. I found a lot of useful related information from the archive, but hope to get some recent experience. Maybe within recent 2-3 years? Thanks in advance.
Sincerely,
Dejian
Dejian Ma
UTHSC (University of Tennessee Health Science Center)
Received on Fri Mar 18 2016 - 11:10:19 MST