[sudo-discuss] [CCL] Re: SEM microscope

[Benjamin Rupert]

Besides Cindy's concerns, we will also need a supply of liquid nitrogen.
The detectors are liquid nitrogen cooled and need to be replenished daily
on most instruments.

On Wed, Dec 24, 2014 at 8:55 AM, CindyB <notcindybnot at gmail.com> wrote:

> 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> 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/XRayF
>>> acility/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?
>>>
>>>
>>> _______________________________________________
>>> sudo-discuss mailing list
>>> sudo-d... at lists.sudoroom.org
>>> https://lists.sudoroom.org/listinfo/sudo-discuss
>>>
>>
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