Shooting an electron beam through air

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A special 100nm thick window allows 25 KeV electrons to pass from a vacuum tube to the atmosphere where they hit a fluorescent screen -- a CRT in air!

Deep technical resource on dielectric charging via electron bombardment:

Applied Science

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OMG you built a Lenard tube! I've always wanted to do this. Amazing as always, so glad to finally see a good video about this. If you do ever want to mess with higher voltages, look at a linear potential drop accelerator. Can be powered by a standard cheapo van-de-graff generator (they're also called van de graff accelerators for that reason) and you've already got all the stuff to build it basically. I suspect you could get the lichenberg figures working that way. Also on the list of things I've always wanted to build

thethoughtemporium

Things to put in the beam:

CMOS / CCD sensor.
Crookes radiometer
Various (decapped?) ICs / semiconductors, see how their characteristics change
voltage references / bandgaps
Opamps
Diodes
transistors / mosfets

fgbhrl

We're gonna need a good vacuum, so conveniently, I had this turbomolecular pump laying around...

derek-perry

I really appreciate how this channel is filmed and edited. It's high quality without being gimmicky and slick like so many other YouTube channels, which makes it easier to focus on the content and not the presentation (the lack of background music is especially refreshing).

timg

Would love to see you expose a micro SD card to the beam (or some other array type device), I wonder if you could attempt to make a cool but completely useless image sensor out of it (although I suspect the wear leveling to be a problem on modern ones).

Connecting a metal plate to an analog ammeter and to ground and moving it around in the beam would also be a really simple but cool demo.

I also wonder if considering this thing is putting out a good watt or two of radiation (might have to crank it up a little for this work) I wonder if you could put the aerogel (or some other low thermal conductivity material) into the beam and then cross section it while filming with a thermal camera, I would expect to see an interesting pattern as the beam is absorbed by the material heating it.

I also see a lot of people are suggesting a cloud chamber, I would love to see that as I don't really know what kind of trails this thing would make.

WizardTim

Loved it Ben. Next stop: demonstrate the wave character of the electron by placing a dual slit in the beam and a phosphorus screen behind it. Though, I must admit this experiment is a way more difficult than it sounds...

HuygensOptics

Exposure to an area of bread to determine how well it inhibits mold growth.

nw

I love how you show your process and explain why you do it that way. One day I hope to start a kind of lab of my own, and I love seeing all the different ways people use tools for various purposes. Thanks for the good content!

Amy_A.

I always marvel at your videos, but the comment section.. it's amazing how great community you've gathered on a platform none other than youtube. It's a pleasure to read these comments with so many insights and good questions. Your channel is like a microverse of curiosity, such a lovely place.

an EPROM chip could be interesting, while constantly reading it to see if the bits just get erased (like with UV) or get wildly flipped around because of the electrons

among-us-

It'd be interesting to see its effect on a living thing - maybe part of a plant, or an agar plate with bacteria? I'm assuming it'd kill / sterilise the affected region very quickly.

JMMC

I’m a user of Thomas Jefferson National Accelerator Facility, which has a 12GeV electron beam. Each aluminum ‘window’ is several millimeters thick to hold back the atmosphere, and so the beam traverses several centimeters of aluminum without losing much energy at all.

caseymorean

Stick something under it and put your XRF detector next to it!
Since you're firing electrons at something, you can get characteristic x-ray peaks out of it, just like you would with any regular x-ray tube.
This is just how SEMs do it!

Spirit