Automated beam alignment for high exposure currents
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When using exposure currents > 100 nA, we often find that the gun must be realigned with
pg adj beam align
followed by
pg arc save beam whatever
Now you can do this automatically (for cjob jobs) by making copy of aba_after_beamrestore in a likely place such as /home/pg/bin, then adding the line
export CJ_BEAMALIGN="/home/pg/bin/aba_after_beamrestore"
to the file /home/pg/pg_local. This script contains local symbols, which are set upon logging in.
Edit the file /home/pg/bin/aba_after_beamrestore, setting
current_threshold=90
This forces the exposure job to run "pg adj beam align" before running "pg adj ebpg", for any current over 90 nA.
It is also common to save aba_after_beamrestore in the folder /home/pg/jobs.
Find a copy of aba_after_beamrestore (which is a small bash script) by asking your local Raith support person, or find it on your own ebpg with the command
locate aba_after_beamrestore
or
cd
find . -name aba_after_beamrestore
This does not eliminate the need for beam archive maintenance. You should still update the beam files once a week.