I would like to try helping you with your beam focussing problem, but there
are some things that I should know before I can say something:
- What happens if you raise the beam focus again after it drops? Does it
stay fixed or does it raise along according to how you set it?
- Is it possible that the beam focus is ok, but the software is not
following? I have had the problem sometimes that when I raised the beam
focus, saved the source file and the reloaded it, some funny beam focussing
- How do your beam signals look like (compared for example with when you
didn't have this problem)?
- Is only the beam focus acting strange, or do you have other source
parameters doing weird things?
Laboratory of Applied Physical Chemistry
Faculty of Agricultural and Applied Biological sciences
tel.: +32 (0)9 264 6048
fax.: +32 (0)9 264 6230
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From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
Behalf Of Anthony Michaud
Sent: Thursday, January 18, 2001 10:32 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Europa 20/20 beam focus
Hello all. I'm using a Europa 20/20 and am having problems with the beam
focus. Here is a description of the problem:
- In all of the following situations the beam focus was set to 87%.
When the HT is set to 4000V, the beam focus goes to 30%.
When the HT is set to 3000V, the beam focus goes to 54%.
When the HT is set to 2000V, the beam focus goes to 65-67%.
When the HT is set to 1000V, the beam focus goes to 86%.
When the HT is set to 0V, the beam focus goes to 50%.
I am hoping that somebody out there has had this problem before and knows
of a quick fix so that I don't have to wait until tomorrow to get help from