aperture align problems

Charis Quay Huei Li chquay at MtHolyoke.edu
Sat Apr 3 10:37:22 PST 2004

Kai Mei,

     First of all the focus wobble doesn't work.  You can test this by
changing the focus manually back and forth. You'll find that the image is
still moving around even when it doesn't when you turn on focus wobble.
The best way to align the aperture is to 'focus wobble' manually. This
fact is noted in the GG lab version of the raith instructions which is on
the swiki.
     Having said that, the 120 micron aperture has had the same problem
since two bakeouts ago. As far as I know, the machine will just have to be
opened up again and things realigned.
     HOpe this helps.


On Thu, 1 Apr 2004, Kai-Mei Camilla Fu wrote:

> Date: Thu,  1 Apr 2004 17:51:21 -0800
> From: Kai-Mei Camilla Fu <kaimeifu at stanford.edu>
> To: raith at snf.stanford.edu
> Subject: aperture align problems
> I am using the 7.5 micron aperture and can't seem to align it using 
> aperture align.  The focus wobble improves as I move the aperture to x = 
> 100% but I can't move it furthur.  Does anyone know what to do in this case?
> Thanks,
> Kai-Mei

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