Electron Gun - Backstage Science

We take a close look a how electron guns work with accelerator physicist Lee Jones, from the STFC Daresbury Laboratory.

[@OghamTheBold]

Now I know how it works - I just need to find out why I need one

[@theofficialstig]

I love your enthusiasm and ability to explain complicated things in a simple way by the way at 4:51 you seem so happy with your job that you are almost laughing

[@shahir67y]

love this channel

[@rahulsidhu]

Why do the electrons not get absorbed into the anode?

[@theofficialstig]

I love your rnthusiadm and ability to explai things in a simple way btw at 4:51 y

[@steffenml]

This channel should seriously be mandatory for any science teacher to subscribe to, if for nothing else then at least to be able to bring up a selection of videos to add to their "further reading"-curriculum.

[@therealjordiano]

wow .. why haven't i found this channel up until nao D: sooo subbing

[@huntingvuk]

very cool you make great videos! thanks,

[@BackstageScience]

@9hello123 they might know the maths, but have they ever SEEN an electron gun and someone who makes them? That's what I like about making these videos... It's the stuff I learned at school, but suddenly it's real and in someone's hand!!! From my experience on other projects (like periodicvideos, etc) this is what makes a handful of students go from "okay I understand the maths" to saying "actually I could do that as a career!" And for everyone else, it's just cool to see it! Just my opinion.

[@richardstilley3627]

Loved it

[@h2opower]

This explains more about the Gas Processor hope you got that too ;-). For now we know about the need for the highly polished surfaces and laser light interaction.

[@AhmedTouma]

thanks from Egypt

[@jeebersjumpincryst]

@brenoakiy photoelectric emission, its called. some materials (also selenium,caesium,lithium) can release electrons merely by exposing it to light. Exposure meters used in cameras use this effect. I really wish he had explained a whole lot more, about a whole lot more things. I know Brady is on a time limit, but Lee could at least aim it a little more on the comlex end, imo. Thanks for another great vid tho guys. Always appreciated :)

[@metadaptation]

hey, great video! Quick question, does the laser that starts the electrons moving from the cathode use the same principle as the way that the photons cause electron ejection in the photoelectric effect?

[@brizaca]

muy buena explicación

[@irondmax]

awesome and cool

[@BackstageScience]

@huntingvuk thank you!

[@BackstageScience]

@MadMacheart it's never too late!

[@anishrajanparavur]

So, can the electron beam intensity can be controlled by laser beam intensity?

[@OKMUNWURX]

The cathode would need to be at a negative voltage for this to work.

[@aaaflooddrying]

Been lookin at conditioning and annealing the stainless plates. Also wondering if nickel would be better than stainless. Any comments. Clay

[@bazanar]

@5:01 Thumbs up for the ninja guard :P Joke aside I love the channel. thanx!!!

[@Matulite]

"Once it's gone through the hole my job as a gun physicist is done"

[@kaminonagere1]

Only if there's something to break down between the cathode and the anode to carry the spark- these experiments with electron guns are conducted in ultra high vacuum. If there is no gas or very little of it, then there won't be a spark for a range of voltages.

[@funnyhead222]

4:00 "what is vacuum?" you'd expect anyone who's walking in that room to already know what a vacuum is lol

[@butterfingers8008]

Are there any other uses for an electron gun other than particle accelerators?

[@jeebersjumpincryst]

@brenoakiy Im not sure, to be honest, but wish he had explained it. Usually (tv's etc)electrons are produced by thermionic emission,which is a heated up filament(often tungsten)which produces a 'space cloud' of electrons.these dont go anywhere until a large potential dif is applied between the filament and an anode.he refers to it here as electric field.sounds like his one works in 'reverse'. a pd is applied first, then a laser is used to trigger a big torrent of electrons in a very short time.

[@simonRTJ]

how wonderful it is to be talked to like an intelligent being, i didnt understand all of that, but thats okay big network tv stations, i will use my brain & ill figure it out myself

[@madjimms]

Galium Arsenide, when will you be part of my CPU?

[@Styleth]

HOW DOES MAGNETS WORK? (: Love the Video (:

[@marcolopes1180]

How does the laser enable the electron flow?

[@douro20]

I read that the Diamond Light Source uses a thermionic electron gun...

[@9999science]

doesn't that cause a high voltage spark between cathode and anode?

[@brenoakiy]

about the laser part, does that have anything to do with the photoelectric effect?

[@aaaflooddrying]

Was he talking about conditioning, to improve effeciency? like a lawton cell. Clay

[@h2opower]

Good man Irondmax, good man ;-)

[@yuh6094]

wait.... so i can get a Powerbook 170 and take out the electron gun, and make a particle accelerator?

[@brenoakiy]

@jeebersjumpincryst so basically, the laser (photons) gives an extra "boost" to the electron emission xD

[@douro20]

The process sounds like that of spallation- if that's what is going on, then the electrons are literally being knocked off the target by photons.

[@gaynorglowellxsingh]

*Plasma is created in black holes as matter is accelerated to almost the speed of light as it falls into it. Is it possible that dark matter and energy is the byproduct of the matter that falls into black holes, and the big bang released this dark matter back into our universe. CERN is a reversed engineered black hole. It accelerates plasma artificially to achieve the same result by producing quantum partials and that black holes create the same partials that CERN does. (see video

[@AngeloGi]

Oh! You ARE Brady! Haha

[@nofacee94]

@rapturecase Its called a reflection.

[@rapturecase]

why is there a picture of a guy painted on the cathode?

[@betterlivin6991]

have any parts for sale or donation? i am making a hand sized model,

[@JeanKM1]

Some people seem to be asking you to make longer videos. Please don't do that. I subscribe to a lot of creative commons channels, but I rarely have the time to watch them. The length of your videos is just perfect.

[@ricktbdgc]

sure yeah ill make electron guns

[@AngeloGi]

Are you Brady's brother or...?

[@joshuaellefsen5241]

why dont i have any audio?

[@itzdaman]

Is that some Labview? I think that's sum Labview right there. :p

[@Carutsu]

@BackstageScience don't you have google partnership!?

[@jeebersjumpincryst]

@brenoakiy Though if you have the time, I'm sure wikipaedia or somewhere online could tell you all about it. Dont take what I've said as fact - it's all I could remember, and I had to look in a book here to refresh (yes, a BOOK!) Check everything for yourself.

[@mindsoulbody]

@MadMacheart you don't have to take physics to learn something. School don't teach anything, they make you prepare for a certificate to go to work. Learning comes from self motivation and desire. You have hunger for knowledge? If yes, then start reading science books, in this case: physics books.Your regret should be about WHY you are not reading them now (assuming you are not) instead of why you haven't taken physics.

[@irondmax]

more or less different types of semi conductors coated onto the surface of an electron gun more like a impedence layer i guess

[@MrDannyArcher]

I regret taking add math :( but Im GLAD I took physics :D

[@irondmax]

yea. like you say, it is all in the science all the answers are there, if we look you 2 caught me looking LOL this is a good video

[@flyingpigstuff]

@MadMacheart I am 40, mopping floors ATM just to attend Uni again.

[@irondmax]

i only use 304 then let it cook overnight

[@QuiRkNoVa]

im watching this science videos with hopes of building an iron man armour.. haha...

[@douro20]

That's a pretty far cry from the much simpler thermionic electron gun which is used in small LINACs and cathode ray tubes.

[@kibabiba]

1 man was gun down

[@ricktbdgc]

this guy must make a shit load of money can anyone tell me how much a scientist can make i know its all government funded

[@LCDRformat]

Khan Academy

[@holdmybeer]

thumbs up if you think im a douche bag for saying thumbs up :D

[@valken666]

Complexity is an illusion and a distraction. Tell us why it happens and don't avoid doing work to be truly useful.