FAQ NO. 7 RAITH BEAM BLANKER in wrong phase or polarity. How to fix...
jwc at snf.stanford.edu
Tue Jun 27 09:14:54 PDT 2006
Greetings Raith Users:
RE: FAQ NO. 7 RAITH BEAM BLANKER in wrong phase or polarity. How to fix...
I have been seeing this occasionally, more often recently, and it is
normally a result of the previous user on the system whom has reversed
his blanking state and then when the software application thinks the
blanker is unblanked the user resets the front panel of the ELPHY+ High
Speed Pattern Generator.
The other cause of this is if the ELPHY+ High Speed Pattern Generator is
manually switched to beam 'on' manual control. This is the far right
toggle switch on the ELPHY+ High Speed Pattern Generator and it should
always be in the UP position and not in the DOWN position ever as Randy
found it upon coming onto the system very early this morning.
If you have managed to get your software into a reversed blanking state
this is how to recover it and restore normal blanking functions.
In the RAITH 150 Application window confirm that the software toggle for
Blanking indicate 'Beam Blanked'
On the ELPHY+ High Speed Pattern Generator move the momentary toggle
position switch on the Far left hand side upwards to 'RESET' the ELPHY+
High Speed Pattern Generator. The deflection indicators should center
and the beam blanker box above it should have the 'Beam Off light'
indicating ON and the 'Beam On light' OFF. Then Save your project file
to record and preserve this state for your next use. If necessary you
can gracefully exit and come back into the application and/or reset the
hardware -- but normally you will not have to.
Randy Stoltenberg wrote:
> I'm doing a write right now, but I don't know if it's going to work.
> The beam blanker on the Raith side is out of phase. (On=off and vice
> versa). I notice that as the stage translates during the write, I'm
> still getting beam current. I don't think this is good. DOes this mean
> I'm just exposing everything? I tried a full restart of the Raith
> computer, but that didn't fix the problem. What should I do?
> Randy Stoltenberg
> Ph.D. Student, Department of Chemistry
> Stanford University
> Stauffer III, Room 15
> 381 North South Mall
> Stanford, CA 94305
> randalls at stanford.edu <mailto:randalls at stanford.edu>
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