Hi Archy,

It sounds like the magnetic field that does the beam focussing has weakened.
We had a similar problem with a gun of a similar age where I did my grad
studies.  We ended up sending the magnets out to be re-magnetized.  The gun
should be stamped with the manufacturer somewhere.  You could try contacting
them about new magnets (the guns haven't changed much) or they might be able
to give you a lead on where to get the magnets re-magnetized.

Mike

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Archy Xuan
Sent: October 6, 2004 10:41 AM
To: [email protected]
Subject: [mems-talk] eBeam evaporator problem


Hi, all,   In my lab there is this 20 yr old NRC e-beam evaporator that
broke down lately. We had some urgent project needs be done and this busted
me.

The symptom is that the beam won't focus, and is very broad (~3/4"
diameter).  In effect, it heats up the edge of the crucible.  We can't melt
anything in the crucible, not even Au.
I have no clue how to fix this thing.  I'm guessing that the focusing
mechanism is busted.

anybody can throw some ideas? It's fairly urgent and thanks!


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