From: Geoffrey J. Gettelfinger
Sent: Tuesday, February 06, 2007 8:33 AM
To: Wayne T. Reiersen; Robert A. Ellis; Mike Cole; 'Freudenberg, Kevin
D.'; David E. Williamson; Lawrence E. Dudek; Phil Heitzenroeder; Irving
J. Zatz; Bradley E. Nelson; Paul Goranson; 'fogartypj@ornl.gov'
Subject: Brief Testing Notes

Some exposure trials were conducted in the testing laboratory yesterday:

Poor Result:
The fiber optic-interrogated displacement transducer (sent by K. Freudenberg) was gradually cooled to a temperature approaching 77K that first purged the air and associated moisture out of the test volume.  No evidence of frost was seen on the transducer.
Similar to Kevin's earlier observation, the transducer's plunger locked up in its guides and would not move.  This may be due to differential thermal contraction or frosted water vapor inside this closed assembly.

Poor Result:
A 0.004" thick 304SS substrate coated with diamond and a nickel binder was subjected to a series of "dunk" tests in LN2.  After the 3rd immersion  cracking sound was heard and bubbles appeared in the nickel binding coating.
This result complements a post-mortem observation make on one of the pull test foils. 

Good Result:
R. Ellis provided a surplus part from a JET diagnostic which we will tentatively call alumina deposited on Inconel.  This element survived 10 dunk/ambient cycles without apparent degradation.
A previous design review discussion suggested this ceramic coating for bushing insulation.

Please distribute to any I have omitted.

Geoff