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

Thu Dec 25 16:14:13 PST 2014

So you're saying we should not run the SEM while the giant Tesla coil right
next to it is running, right? :-D

I know there are at least two other hacker EM's in the Bay Area - Ithink
Miloh has one, and there is/was a second at Noisebridge that may or may not
be in storage somewhere at the moment. Could someone who knows more about
these other machines post their specs (and potential availability)?

Are there particular types of EM's that are more forgiving in terms of
environmental conditions and user friendliness? How does this Jeol machine
compare to the others in this regard?

Patrik

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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