In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.
Subject: P.S. on Vac. troubles
Date: Mar 31, 09:45 am
Poster: Richard Hull
On Mar 31, 09:45 am, Richard Hull wrote:
I just though a bit more on Bob's problem.
A mercury diffusion pump is always glass. Metal is a no-no! All oil pumps are 100% metal and water cooled above the boiler. The thermal conduction of metal is a lot better than glass. The all glass mercury pump will be far less effective in stoping backstreaming oil, if used in it instead of mercury, than a formal water cooled, all metal diffusion pump made for oil work.
This may be why the mercury pump forced into oil service is causing backstreming contamination.