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<p>Hi all,</p>
<p>We are trying to trouble-shoot a PVD e-beam source and can't seem
to figure out the problem. Early in the year we sent the assembly
out for repair and refurbishment. (we burned a hole in the
internal bellows tubing, long story) When we got it back we
connected it back to the system and started it up. However, we
haven't been able to get a stable emission current. The HV stays
on but the filament current, and hence emission current,
occasionally cuts out. It comes back a second later, over-shoots
the target current, and then restabilizes. It happens at low
emission currents and some higher ones. The timing is random.
Sometimes it happens frequently, sometimes you can run 15 min
without a problem. There are no errors from the power supply.<br>
</p>
<p>We took a video of the issue and it happens at around the 1min
mark <a moz-do-not-send="true"
href="https://www.dropbox.com/s/7n42e38qviju7ga/Both_emission_and_filament_spiking_and_turning_off.mov?dl=0">here</a>.
The advice from vendors was to look for a loose connection. We
have checked all the external connections and tried to look at the
internal ones too. Last week we removed the filament and
reinstalled it. We didn't see any problems and we still have the
same issue.</p>
<p>We're running out of ideas other than sending it back to the
vendor to examine the entire assembly again. Has anyone else
encountered this type of problem? Any suggestions?</p>
<p>Thanks,<br>
Nathanael<br>
</p>
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