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Home > The Amp Hour Electronics Podcast > #431 – An Interview with Adam McCombs


	Podcast:		The Amp Hour Electronics Podcast
	Episode:		#431 – An Interview with Adam McCombs
	Category:		Science & Medicine
	Duration:		01:16:47
	Publish Date:		2019-02-24 21:52:06
	Description:		Welcome, Adam McCombs! Check out his talk at Supercon and the associated article on Hackaday.com Scanning electron microscope 0h 0m 45s 2017 got the first microscope 0h 1m 10s Dan Burrard STM microscopes 0h 1m 43s @Nanographs 0h 2m 28s Vacuum is shockingly challenging 0h 2m 46s Air stops behaving like a liquid 0h 3m 57s Turbomolecular pumps 0h 4m 16s 14.4 atm 0h 5m 24s turbo pump looks like a turbine 0h 6m 41s Roughing pump can get 10^-3 torr 0h 8m 2s Thermionic emission gun 0h 8m 54s Tungsten filament 0h 9m 3s Magnetic lenses 0h 9m 52s Electron detector 0h 11m 0s Uses 400V to attract electrons towards the phospher 0h 11m 13s Older systems needed higher energy electrons 0h 12m 13s You can melt things in an electron microscope 0h 13m 26s Electron-beam welder 0h 14m 14s Cutting edge is wet samples 0h 15m 18s Most things in SEMs are dead 0h 15m 28s Newest semiconductors is 7-14 nm 0h 17m 33s Optical vs SEM with Depth of Focus (DOF) 0h 18m 50s Preparing the sample generally has to be conductive 0h 19m 41s Non-conductive things are usually coated in gold 0h 20m 26s Gold coated cheerio 0h 21m 24s Thickness of the sputter depends on needs: thicker is less coating 0h 22m 38s Angstroms vs nanometers 0h 23m 37s SEM vs STM vs TEM 0h 27m 28s SEM images the surface of things 0h 27m 39s STM transmits electrons through the sample 0h 27m 49s imaging bonds requires an atomically thin sample 0h 28m 51s can image magnetic fields with a TEM 0h 31m 30s can to tomography if you image things in sequence 0h 31m 55s Learned about the brain project from Allen Institute 0h 33m 51s Scanning tunneling electron microscope (stm) 0h 34m 49s Doesn’t operate at vacuum 0h 35m 6s “Coarse approach done, now to bring it in to quantum tunneling range to start scanning. I always love when we can leverage quantum effects using tools you can just build out of parts from the hardware store, eBay, and digikey.” 0h 36m 22s SEM is for surface science 0h 37m 28s TEM is used for things like asbestos 0h 38m 5s Also used for histology (telling if a sample has a virus) 0h 38m 57s STMs are more specialized – atomic resolution of the surface of a sample 0h 40m 27s Fundamental material research 0h 40m 47s IBM video “The boy and his atom” 0h 41m 8s Multiframes is possible but resolution goes down 0h 41m 46s Similar to a camera with different exposure 0h 41m 58s Ben Krasnow videos 0h 44m 6s First scope was “some assembly required” 0h 45m 13s Most o-rings are viton – silicon based 0h 46m 8s ISI super 3A 0h 46m 42s Jeol 35C 0h 47m 4s VacuumHackers.com 0h 49m 9s Digital capture isn’t normally included 0h 51m 47s Polaroid film holder to capature images 0h 52m 53s Now doing this for a business as well 0h 54m 11s Repairs, consulting, moving 0h 55m 4s Might be recreating old parts 0h 55m 27s Might be manufacturing heavy and creating parts that enables new pieces 0h 55m 36s The materials of these hasn’t changed much over the years 0h 57m 20s Column is usually made out of iron 0h 59m 40s Electronics usually aren’t the problem 1h 0m 36s Philips manuals are really detailed 1h 2m 9s Manuals for older things are non existent 1h 2m 21s Example of a common failure: beam jumping around 1h 3m 1s RAM failure on a jeol 1200 1h 4m 48s Working with high voltage 1h 6m 1s High voltage tank 1h 7m 53s Putting the electronics into oil 1h 8m 34s xray safety is a big concern in TEMs with 120kV+ electrons 1h 9m 39s Multiple geiger counters (thin window) 1h 10m 11s Follow along on @nanographs 1h 14m 31s VacuumHackers.com 1h 14m 57s nwnlabs.org 1h 16m 20s (Not mentioned during the show) Adam will be at M&M conference in Portland this year
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