[labnetwork] Experiences with tram close to cleanroom facility?

Wed Sep 10 04:37:16 EDT 2014

Dear Sirs,

I recall that , when I worked for VG Analytical, I helped install a mass
spectrometer in the LAND institute in Berlin, very close to the S-Bahn.

The assessment was made that , as magnetic field decreased as 1/r3, then
the trains would not have an adverse effect.

However, what the gurus forgot is, apparently, the trains going past
make an inductance loop. The field from that decreases as 1/r.

Hence, we had to fix the problem using a search coil to cancel the extra
magnetic field error.

Once the search coil system was added, the instrument did not have
problems any more related to the stray field from the trains.

Yours sincerely,

Stephen Howe 
Company Owner
SDI Fabsurplus Group

 +1 830 388 1071 (Mobile)
+39 335 710 7756 (Italy Mobile)
Skype: Stephencshowe
email: info at fabsurplus.com

WWW.FABSURPLUS.COM
Japan-Italy-Ireland-USA

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Japan-Italy-Ireland-USA

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On Tue, 2014-09-09 at 16:41 -0400, Iulian Codreanu wrote:
> Other EMI cancellation system vendors:
> -Stefan Mayer Instruments
> -Spicer Consulting
> 
> Other vibration cancellation system vendors:
> http://www.techmfg.com/products/floorplatforms/quietisland.htm
> iulian Codreanu, Ph.D.
> Director of Operations, UD NanoFab
> University of Delaware
> Office: 163 ISE Lab
> Mail to: 250N ISE Lab
> Ship to: 165 ISE Lab
> 221 Academy Street
> Newark, DE 19716
> 302-831-2784
> On 9/9/2014 2:58 PM, Morrison, Richard H., Jr. wrote:
> 
> > Hi Leif,
> > 
> >  
> > 
> > When we built our facility in 2012 we had vibration measurements and
> > magnetic field measurements taken in the areas where the Stepper,
> > SEM and AFM were to be located. These were 24 hour surveys. We have
> > a subway line located 1 block from our facility and a freight train
> > line 50 feet from the building.  Both surveys showed when the subway
> > was active, there was magnetic interference and significant
> > vibration.  However,  we were located on the 3rd floor so that
> > attenuated the magnetic field enough and the vibration was below the
> > specification of the tool manufacturer.
> > 
> >  
> > 
> > There are companies that sell electrical/magnetic shield systems we
> > use the following company for those solutions:
> > 
> > Ets-lingren    www.ets-lindgren.com    they make an excellent
> > system.
> > 
> >  
> > 
> > If you need a good float table this company makes a unit that has
> > active feedback control for vibration damping:
> > 
> > RDM INDUSTRIAL PRODUCTS, INC.
> > 
> > 1652 Watson Court
> > 
> > Milpitas, CA 95035-6822
> > 
> > Ph: (408) 945-8400 Fax: (408) 945-8433
> > 
> > Website: www.rdm-ind.com
> > 
> >  
> > 
> > Regards 
> > 
> > Rick
> > 
> >  
> > 
> >  
> > 
> > Draper Laboratory
> > 
> > Principal  Member of the Technical Staff
> > 
> > Group Leader Microfabrication Operations
> > 
> > 555 Technology Square
> > 
> > Cambridge Ma, 02139-3563
> > 
> >  
> > 
> > www.draper.com
> > 
> > rmorrison at draper.com
> > 
> > W 617-258-3420
> > 
> > C 508-930-3461
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> > From: labnetwork-bounces at mtl.mit.edu
> > [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Leif Johansen
> > Sent: Tuesday, September 09, 2014 10:20 AM
> > To: labnetwork at mtl.mit.edu
> > Subject: [labnetwork] Experiences with tram close to cleanroom
> > facility?
> > 
> > 
> >  
> > 
> > Dear all network members, 
> > 
> >  
> > 
> > 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. 
> > 
> >  
> > 
> > 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? 
> > 
> >  
> > 
> > Best regards, 
> > 
> >  
> > 
> > Leif
> > 
> >  
> > 
> > Leif S. Johansen 
> > 
> > 
> > Head of Operations
> > 
> > 
> > DTU Danchip 
> > 
> > 
> >   
> > 
> > 
> > Technical University of Denmark
> > 
> > 
> > http://www.dtu.dk/images/DTU_email_logo_01.gif
> > 
> > 
> > Danchip 
> > 
> > 
> > Ørsteds Plads, Byg. 347 
> > 
> > 
> > 2800  Lyngby 
> > 
> > 
> > Direct +45 45255713 
> > 
> > Mobile +45 25348992
> > 
> > 
> > lesjo at danchip.dtu.dk 
> > 
> > 
> > www.danchip.dtu.dk/ 
> > 
> > 
> > 
> >  
> > 
> >  
> > 
> > 
> > 
> > 
> > _______________________________________________
> > labnetwork mailing list
> > labnetwork at mtl.mit.edu
> > https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork
> 
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