Comment raith SNF 2012-05-04 20:13:48: Alignment inaccuracy and stage instability

James W. Conway jwc at
Wed May 9 12:23:30 PDT 2012

This is very strange and I have not seen this issue.   Are you sure your 
didn't just see a shift on the target acquisition due to working area of 
the specific patterns?
Please see FAQ No 5 for a procedure to adjust a position list to pick up 
targets for Automatic WF ALIGNMENT... its inside the FAQ notebook and 
attached herein...

Was this resolved in the reset?

Others care to report any and all problems encountered during your 
sessions. if you are having problems picking up targets for overlay 
please see me and make a session appointment.


On 5/4/2012 8:13 PM, janp at wrote:
> There is a slight offset between the image on the right computer (smartsem) and the left (raith150) that can cause problems when using automatic writefield alignment after doing UV alignment using smartsem. As a workaround, I have been using image capture on the left computer (raith150) to do my UV alignment.
> Separately, during today's write we got a series of "Raith DPGEN SCSI Service Error" messages. After restarting the software on both computers things seem to be working normally. Prior to this, the stage seemed unusually unstable; the coordinates of on-chip locations would change by up to 70 um after stage moves of 5mm or less -- not sure if this is related.
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