Dear Ammrlers,
We are in the process of installing a direct helium liquefier from Quantum
Design for the 7 nmr magnets in the lab. We were told that a back pressure
controller (BPC) is required for each magnet so that the magnets will not
affect each other. To our surprise, the BPCs are very expensive, over $10k
each. If you have experience with helium recovery systems, would you shed
lights on the following questions:
1. Is a BPC necessary between a nmr magnet and the helium liquefier?
2. What vendors carry the BPCs for nmr magnets ?
3. For pumped magnets (e.g. old 800MHz), does the helium exhaust from
the pump have to be purified before going to the helium liquefier? What
purification method do you use / recommend?
Have a great weekend!
Cheers,
Jerry
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*Jerry Hu, Ph.D. *
Technical Director Email:
jghu_at_mrl.ucsb.edu
Project Scientist Tel:
(805)893-7914 (office)
Materials Research Lab, UCSB (805)893-7940 (lab)
Santa Barbara, CA 93106 Fax: (805)893-7914
http://www.mrl.ucsb.edu/spectroscopy-facility
Received on Fri Oct 25 2019 - 08:53:02 MST