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Subject: Re: Helium Pump down time

Date: 07/20/02 at 3:35 AM
Posted by: Anton de Beer
E-mail: antondeb@mweb.co.za
Message Posted:

In Reply to: Re: Helium Pump down time posted by Garry Williams on 07/20/02 at 1:40 AM:

Thank you for your reply.

Firstly. The chamber pump down from atmosphere to 1e-6 in about 4h. I left it over a friday and a weekend to make sure it is clean.

However, the problem can be assosiated with a cast alluminium valve that was fitted to the system. I took these off but still got a similar result. However, I will now carefully check that any other parts are not make of cast Al.

Thank you one again.

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