Why is the Plate Tilted in an Electron Gun?

Click For Summary

Discussion Overview

The discussion revolves around the design of electron guns, specifically focusing on the reason for the tilt of the plate in relation to the electron path. Participants explore theoretical and practical aspects of this design, including its implications for electron beam scanning in devices like CRTs.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the purpose of the tilted plate in an electron gun and seeks resources for further understanding.
  • Another participant suggests that the inquiry may relate to X-ray tubes instead of electron guns, indicating a potential misunderstanding.
  • A participant clarifies that the sheet between the plates is angled to allow the electron beam to scan the entire screen rather than just a central area.
  • It is noted that in CRT TV tubes, magnetic deflection occurs after the beam exits the gun, which may influence the design of the gun.
  • One participant speculates that the throat of the gun might be flared due to finite magnetic deflection, indicating complexity in electron optics and design variations based on specific applications.
  • Discussion includes references to high-frequency oscilloscope tubes and their use of post-deflection acceleration to achieve specific performance characteristics.

Areas of Agreement / Disagreement

Participants express differing views on the purpose of the tilted plate and its implications for electron beam behavior. There is no consensus on the specific design rationale or the relationship to other technologies like X-ray tubes.

Contextual Notes

Participants reference various types of electron guns and their operational contexts, indicating that the design may depend on specific applications and technologies. There are unresolved assumptions regarding the relationship between the tilt and beam scanning efficiency.

SWKatzen
Messages
2
Reaction score
0
Hi,
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path? Or has any resources that I could read to better understand? Thanks.
 
Physics news on Phys.org
SWKatzen said:
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path?
Tilted plate in an electron gun? Did you mean an X-ray tube?
https://en.wikipedia.org/wiki/X-ray_tube
 
No sorry, the sheet between the two plates is at an angle to the electron stream. This is what I’m not sure about-
 
SWKatzen said:
Hi,
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path? Or has any resources that I could read to better understand? Thanks.
Can you link to some pages that show this? That would help us out. Thanks.

https://en.wikipedia.org/wiki/Electron_gun

1602441306981.png
 
SWKatzen said:
No sorry, the sheet between the two plates is at an angle to the electron stream. This is what I’m not sure about-
So that the electron beam will scan the whole screen rather than just a small region in the central area
 
davenn said:
So that the electron beam will scan the whole screen rather than just a small region in the central area
In a CRT TV tube, the deflection is magnetic and comes after the beam leaves the gun. We'd really need to see the particular gun that you are discussing.
 
sophiecentaur said:
n a CRT TV tube, the deflection is magnetic and comes after the beam leaves the gun.

Yes, I know that
 
davenn said:
Yes, I know that
Yeah, I thought you would but did the OP know? It could be that the throat of the gun is flared because there is a finite magnetic deflection, even that far back.
Electron optics is pretty damn hard stuff and the particular situation determines a lot about the gun design. Like, for instance, the high frequency oscilloscope tubes that used post deflection acceleration in order to get a bright line plus a fast scan. (Now that came out of my memory from a long time ago.)
 

Similar threads

Graduate Electron Gun diffraction and undeflected spot diameter
  • · Replies 4 ·
Replies
4
Views
4K
Graduate What Voltages Should Be Used for Focus and Deflection Plates in an Electron Gun?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Charge movement relative to magnetic field frame dependence/invariance
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Why does resistance reduce current in whole circuit?
  • · Replies 38 ·
2
Replies
38
Views
6K
Can Electron Rockets Revolutionize Interstellar Travel?
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Fundamental - Magnetic fields generated by moving electrons
  • · Replies 23 ·
Replies
23
Views
5K
Why Does the Filament Box in a CRT Electron Gun Have Multiple Pins?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Why Is There No Induced Magnetic Field in Oscilloscope Electron Deflection?
  • · Replies 1 ·
Replies
1
Views
2K
High School Why doesn't the electron "wave" collapse at the double-slit?
  • · Replies 28 ·
Replies
28
Views
8K
Undergrad Gauss' law, method of images, and force induced on conductor plates
  • · Replies 17 ·
Replies
17
Views
2K