Thanks for all the responses regarding my need for a vacuum adapter
fitting to mate to my R2D2 magnet. Eric Enwall of the U. of OK at Norman
is being kind enough to lend me one of his.
Dennis Edwards at the U. of UT also reminded me that sometime an ice
block in the left quench stack will cause a high He boiloff rate.
I pulled the cap off and there was a bunch of solid N2/O2 on the tube
that instantly vaporized. The He boiloff seems a little more reasonable
now but the N2 boiloff is still high.
I have about 40 L of lHe I can top off the magnet with next week if
need be. I will keep the group posted as to the outcome if anything
interesting happens...if only to keep those with 9-month-hold-time
magnets entertained.
Jeff
Dr. Jeffrey H. Simpson jsimpson@mit.edu
Instrumentation Facility Director 617/253-1812 office
Department of Chemistry, 18-0090 617/253-1806 lab
Massachusetts Institute of Technology 617/253-0873 fax
77 Massachusetts Avenue, Cambridge, MA 02139-4307 USA