| DATE |
MAINTENANCE |
| 16 Mar 2006 |
cleaned refrigerator, replaced stage1,2,3 seals 2nd stage linkage pin missing a phenolic plug, repaired with Envex |
| 30 Mar 2006 |
installed dewar on C7 |
| 21 Mar 2008 |
stage3 running at 7K, even though Mark had warmed to room
temperature and purged on 2 successive days Mark and Russ opened, replaced stage3 seal, and maybe other seals too |
| 07 May 2008 |
dewar removed from C7, brought back to Berkeley |
| 13-15 May 2008 |
Scotch yoke wobbling, so replaced bearings; used one of
Curt's plastic bushings on the refrig side, since Kap-Seal mount is chipped replaced dowel pin on one of the valve clothespins installed new stage1 seal, reused stage2 and stage3 seals installed HIA-073; refrig running at 53/14.6/3.5/3.6/3.6 K in lab test |
| 21 May 2008 |
installed on C11 |
| 10 Sep 2009 |
removed from C11 |
| 21 Sep 2009 |
opened refrig - displacers fairly dirty, but Scotch yoke bushings
are fine; cleaned and baked displacers, replaced stage3 seal, but reused 1st and 2nd stage seals |