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Hi Leif,<br>
<br>
Our new clean room at U of Minnesota sits a few hundred feet from
the city's light rail (also an electric surface train). We see
almost no measurable noise from the trains on our SEM or e-beam
litho units, but if it becomes an issue for you the Lindgren active
cancellation system Richard suggested was an easy retrofit to our
lab, so you could always add it later if you're getting noise. We
installed one for an unrelated issue (noise from the building
elevator) and it works perfectly and requires basically no
maintenance.<br>
<br>
Cheers,<br>
<br>
-bryan <br>
<br>
<div class="moz-cite-prefix">On 9/9/2014 9:20 AM, Leif Johansen
wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Dear all network
members, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The City of Copenhagen
is currently in the process of scheduling the construction
of an electrically driven tram which may run approximately
80 feet (ca. 25 meters) past our cleanroom facility. There
will even be a stop right outside on the road next to us –
i.e. many accelerations and decelerations which will emit
rather large magnetic fields.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Naturally, we are
slightly concerned about maintaining operations – especially
of our e-beam writer and SEM equipment. Are any of the lab
members facing similar challenges and, if so, how do you
tackle them? Is noise cancellation a viable option with
large transient magnetic fields? <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Leif<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
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S. Johansen
</span></b><b><span
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Danchip
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University of Denmark</span></b><b><span
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<pre class="moz-signature" cols="72">--
Bryan Cord
Minnesota Nano Center (MNC)
University of Minnesota
115 Union St SE, Rm 153
Minneapolis, MN 55455
612.626.3287 (work)
857.891.6820 (cell)
<a class="moz-txt-link-abbreviated" href="mailto:bcord@umn.edu">bcord@umn.edu</a>
<a class="moz-txt-link-freetext" href="http://wiki.umn.edu/EBPG">http://wiki.umn.edu/EBPG</a></pre>
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