Brmsem
founder:	mrkva
depends on:
interested:	status=active
software license:	-
hardware license:	-

~~META: status = active &relation firstimage = :project:sem.jpg ~~

Goal of this project is to assess whether is possible to build a scanning electron microscope in DIY conditions. There are various sensors that can be used together with SEM - the easiest one to get running is probably the secondary emission detector. However it would be great if we would be able to use backscatter detectors or even X-ray detector for EDX spectroscopy one day!

It will also be necessary to get some kind of metal sputtering working to be able to view non-metallic samples.

(We'll begin with coarse building blocks and discuss details later)

• Vacuum chamber (we have one, check if it is usable)
• Base for vacuum chamber with airtight connectors for high and low voltage leads
• Vacuum pumps system for fine vacuum
• Various power supplies (accelerating voltage, focusing voltage, heater), exact parameters will have to be calculated
• electron gun: electron source, electron optics
• detector (scintillator + photomultiplier)
• display - for initial tests two channel analog oscilloscope with XY mode and z input should be enough (mrkva can provide one). Later, ADC and digital processing is desirable

• Build and test vacuum pump system to see if we can achieve low enough vacuum (something in the range of 10^-6 Pa will be necessary)
• 

http://www.geo.umass.edu/probe/electron%20optics%20-%20lenses.ppt http://www.reu.pdx.edu/SEM%20Short%20Course.pdf