Fusion Message Board

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: Vacuum troubles
Date: Mar 30, 8:01 pm
Poster: Robert Machler

On Mar 30, 8:01 pm, Robert Machler wrote:

Since the last time I talked about vacuum systems, I have a problem. I'm using an oil
diffusion pump with a hydrocarbon pump fluid
with a vp of 1.5x10^-7. pumps ok but am not using
a cold trap. This pump was made to use mercury
and works very well but you of coures do need a trap. Question!! what's wrong with using mercury
if you can stop backstreaming. The oil deal seems to contaminate the system, would a cold trap at
-45 degrees be of help here?
Could anyone help me here??
Thanks Bob