Subject: Raith Status Update
From: Bing Dai <>
Date: Sat, 24 May 2008 23:32:01 -0700

Hi all,

The vacuum was fine when John Shott cleared the 'shut down' and I was  
able to unload the previous user's samples. However, during my session  
the vacuum was off twice. First time it was off during the write field  
alignment. Repumping returned the vacuum to normal and I was able to  
start my writing. But vacuum and EHT were off again during the  
exposure. I could only finish part of my exposure and had to cancel  
the remaining of my session. Currently the system vacuum is OK but Gun  
vacuum is as low as  1.7e-7Pa.
It might still be OK for ebeam writing but it would be better if we  
can wait till the problem is solved. 'Yellow light' was put on coral.


Bing Dai
Applied Physics Department
CISX B103, 420 Via Palou,
Stanford, CA 94305
(650) 723 4566