RF electron source

Radio frequency (RF) plasmas are attractive as electron beam sources because they allow for a design where the cathode dose not participate in electron production while providing high efficiency and long life operation. Traditionally, hollow cathodes or tungsten filaments have been used as electron sources because of their high electron current density and relatively low power requirements. However, their operational lifetime is limited by cathode and filament deterioration, contamination, and barium diffusion rates, and in some cases requiring a large amount of inert feed gas, thus rendering them less suitable use in corrosive environments and sustained use.

The Non-ambipolar Electron Source (NES) is a device that produces electron beams from plasma created with RF fields in a magnetized plasma combined with electron extraction by electron sheaths.

Category:

Science & Technology

Tags:

• NES
• non-ambipolar
• electron
• source
• nonambipolar
• ambipolar
• rf
• radio
• frequency
• helicon
• inductive
• capacitive
• plasma
• wave

[ScrappeyDP]

yeah. I get the chemistry, but what is it used for?

[benwl]

They would be used for neutralizing ion thrusters (both Hall thrusters and gridded ion thrusters) that are used onboard spacecraft. In general ion thrusters are a low thrust (<1 Newton) technology but they are left on for long durations (0.5 ro 4 years).

[rjamesnw]

You have to thank the "geeks" for the computer you are using to watch your videos. :)

[whoisondrugs]

Has the world really come to this? Can you use that laser beam to clean up the population of ignorant dweebs like this one? I love your video, you are a true genius, you build technology to shape the future and post your research for other intelligent life form to discover, and all the while, how do you keep a strait face when XUGA234 insults your very essence?

[superscorer773]

this sucks

[crispycannibal]

@rjamesnw should never insult geeks. You will just end up working for one, someday.

[brianmenendez]

@whoisondrugs So!

[iminyourbasement]

thats an odd looking dildo.

[jonbeard9]

Where's the sound?

[abram730]

This could be logical house of cards but...

If you can use plasma as a source of electrons then wouldn't the atoms have more repulsion? If the atoms have more repulsion then wouldn't compressing a plasma and then removing electrons provide more thrust to a plasma rocket mid way threw the 2 Tesla magnet? If you used those electrons to highly Ionize the 1st stage plasma wouldn't it compress more during the 2 Tesla stage?

Was that Gold or dung?

If true positrons could remove electrons.

[4jeremy9]

how are RF plasmas attractive as electron beam sources when they dont participate in electron production?

[Depthhider]

now just slap an electron director on it and put a huge prosperous coated screen in front of it, put in a vacuum and voila, the worlds most inefeciant crt monitor. LOL