[sudo-discuss] SEM microscope

[CindyB]

Environmental vibration and EMI will limit the ability of whatever scanning 
electron, confocal or scanning tunneling system you put in the building. 
Look for the environmental vibration specs of the equipment you want to 
consider. For example: 
http://fbodaily.com/archive/2004/09-September/02-Sep-2004/FBO-00661968.htm  
It's a bit of an ugly format but a bit down the page is a list of frequency 
and magnitude limits under which the JEOL 6400 system operates to spec and 
defines proper vibration isolation. The high magnification systems may not 
be able to have sufficient vibration isolation without a very expensive 
facilities upgrade depending on the floor underpinnings. Trains, motor 
vehicles on nearby roads and possibly even people walking in the building 
can transmit vibration that limits the ultimate resolution.

Likewise, clean power is essential. Power line conditioning that removes 
unspec'd frequencies is required or you will never get the system stable 
enough to hold focus to image or analyze.  At least in the past, JEOL was 
not that good at making their system fit into less than stellar laboratory 
conditions. Likewise, you will want to be careful about through-the-air 
electromagnetic interference from things like power lines, etc. The 60Hz 
frequency from power lines throws a magnetic field through the air that 
will generate a beat pattern in the images. This will limit the minimum 
accelerating voltage you can use without interference.

Next to the Tesla coil? A Tesla coil creates a magnetic field which will be 
transmitted through the air to interfere with the electron beam of the SEM. 
Other things that throw off magnetic fields like transformers, anything 
that spins or vibrates deliberately like vortexer, centrifuge, orbiters, 
etc. will throw off magnetic fields, too.

Environmental and power considerations are going to make or break the 
ability of CCL to effectively use the JEOL SEM in the lab.

I suppose you might wonder why I would know about SEMs and environmental 
considerations. One of the areas I worked in at Intel was the replacement 
of optical critical dimension measurement with SEM critical dimension 
measurement inside a semiconductor manufacturing facility. We implemented 
JEOL, Nanometrics and ultimately Hitachi SEM systems. JEOL and Nanometrics 
were very sensitive to the environment we placed the systems. Hitachi much 
less so. 

If you can come across a Hitachi SEM you _might_ be able to make it work in 
the CCL environment. JEOL SEMs can be very good systems placed in a good 
clean, vibration isolated location. It will be very difficult (maybe 
impossible) to get sufficiently useful images or beam control for 
analytical reasons without such conditions.

Cindy

On Monday, December 22, 2014 7:05:22 PM UTC-8, patrikd wrote:
>
> Awesome! Forwarding to CCL as well...
>
> Patrik
>
> On Mon, Dec 22, 2014 at 6:15 PM, Jake <ja... at spaz.org <javascript:>> 
> wrote:
>
>> We have been offered a scanning electron microscope.  I have accepted and 
>> marc and I will go get it if it's still available.
>>
>> I don't know if it has a spectral detector for EDS, but I got one at
>> Urban Ore yesterday for $25, so we can add that functionality if it 
>> doesn't already have it.
>>
>> http://en.wikipedia.org/wiki/Energy-dispersive_X-ray_spectroscopy
>>
>> this picture was taken with a SEM like the one we're getting:
>>
>> http://microscopy.tamu.edu/picture-of-the-month/PoM_708.jpg/image_large
>>
>> here is what the machine probably looks like, based on a google search of 
>> Jeol JSM 6400
>>
>> https://engineering.purdue.edu/MSE/Research/Facilities/
>> XRayFacility/Microstructural/Microstructural/6400_SEM.jpg
>>
>> we can put it on the border / neutral zone between sudoroom and CCL like 
>> the CSAM and tesla coil.
>>
>> -jake
>>
>> ---------- Forwarded message ----------
>> So, yeah, I can potentially grab a Jeol JSM 6400. You should look at 
>> pics. It is fairly large.
>>
>> Right now it is in Santa Barbara. I don't have a good plan for moving it, 
>> or putting it somewhere (hopefully where
>> people can use it). The company that bought it was told it works when 
>> they bought it, but they never tested it. I
>> should note that I am talking to a few people and I'm hoping one of them 
>> works out.
>>
>> I would need to get it Jan 19-20.
>>
>> Does this still interest you?
>>
>>
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>>
>
>
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