Electron Source

  • #1

Main Question or Discussion Point

I have seen designs of electron sources that use a heated filament to create a cloud of electrons then apply a voltage across them to accelerate them for whatever purpose. Could you replace the filament with a needle spraying the electrons?
 

Answers and Replies

  • #2
chroot
Staff Emeritus
Science Advisor
Gold Member
10,226
34
When you say "spraying," what do you mean? You could use an electron source of any shape you'd like -- needle, filament, whatever -- once you collimate and accelerate the beam, it no longer matters what the original shape of the source was.

The reason why a filament is used is just because it's easy to heat one up by passing current through it. It'd be harder to design a way to heat up a needle.

- Warren
 

Related Threads on Electron Source

Replies
3
Views
639
  • Last Post
Replies
8
Views
680
Replies
16
Views
11K
  • Last Post
Replies
3
Views
674
  • Last Post
Replies
1
Views
899
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
11
Views
3K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
12
Views
632
Top