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<p>Hi Chito. I might be missing something, but why do you perceive
this to be a bad thing? Why not just use the higher beam current
and be done with it?</p>
<p>--Mike<br>
</p>
<br>
<div class="moz-cite-prefix">On 11/11/2016 4:43 PM, Chito Kendrick
wrote:<br>
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<p>We have a Denton electron beam deposition system for doing
Cr/Au and most users want 5 nm Cr/ 100 nm Au. It has a Telemark
6kV supply.<br>
</p>
<p>We were using a carbon crucible for gold, but it it looked like
we were getting carbon contamination so I switch to a tungsten
crucible (7 cc). This seemed to be going well, except we are now
having to increase the beam current after each run to melt the
gold and to get the same rate. I have changed the filament and
there was no improvement. I put in some more gold, but that
seems to have made is worse. Could I have over filled the
crucible so there is too much mass to melt? All the other
materials we have seem to not have changed and it was only the
gold we change the crucible to.</p>
<p>I am very tempted to order a new crucible or find away of
getting the gold out of the W crucible to reduce the mass.<br>
</p>
<p>Chito Kendrick<br>
</p>
<div class="moz-signature">-- <br>
<a moz-do-not-send="true"
href="https://sites.google.com/site/chitokendrickphd/">Chito
Kendrick Ph.D.</a><br>
<br>
Managing Director of the Microfabrication Facility<br>
Research Assistant Professor<br>
Electrical and Computer Engineering<br>
Michigan Technological University<br>
Room 436 M&M Building<br>
1400 Townsend Dr.<br>
Houghton, Michigan 49931-1295<br>
<br>
814-308-4255<br>
</div>
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