Magnetic field lines through copper

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Discussion Overview

The discussion revolves around the behavior of an electron beam in a homemade Scanning Electron Microscope (SEM) when using copper as the material for the electron gun instead of glass. Participants explore the implications of using different materials on the deflection of the electron beam due to magnetic fields produced by scanning coils.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether the deflection of the electron beam would remain linear if the electron gun is made of copper instead of glass.
  • Another participant suggests that if the target is uncharged, there should be no expected deflection regardless of the material used.
  • A participant provides additional context about their homemade SEM setup, noting that they previously used scanning coils inside a vacuum and are now using external coils, which raises concerns about the accuracy of the beam deflection relative to the magnetic field produced.
  • Another participant expresses confusion about the description of the setup and mentions that both copper and glass do not significantly influence magnetic fields, suggesting that changes in the magnetic field configuration may not be expected unless at very small scales.
  • A later reply acknowledges the previous participant's response as the expected answer, indicating agreement with the assessment of material influence on magnetic fields.

Areas of Agreement / Disagreement

Participants express differing views on the influence of material on the deflection of the electron beam, with some suggesting no significant difference while others raise concerns about the specifics of the setup. The discussion remains unresolved regarding the exact impact of using copper versus glass.

Contextual Notes

Some assumptions about the magnetic field configuration and the scale of influence of the materials are not fully detailed, and there is uncertainty regarding the effectiveness of the external coils compared to the internal ones.

Ravaner
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Hello. Assume an electron gun, as in CRT, made of plumbing copper instead of glass. Using magnetic scanning coils to move electron beam. Will the displacements of this beam be linear as if tube material was made of glass ? PS : this is not an exercise by though but a real problem I encounter in a system I've developped.
 
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If the target is uncharged, I don't see any reason to expect a deflection, independent of the target material.
If your question does not refer to the screen, I don't see what you want to replace.
 
Thanks for reply. To give more details my rig is an homemade Scanning Electron Microscope. Previously I used scanning coils inside vacuum, but for room problem coils are small and produce low induction field. With outside coils bigger than internal ones) it works better but I'm not sure that deflection of electron beam is the exact image of the field produced by external coils (saw tooth).
 
I don't think I understand that description without a sketch.
Copper and glass do not influence magnetic fields significantly. If you don't care about nanometers, I would not expect any changes in the magnetic field configuration.
 
That is exactly the answer I was expecting for. Many thanks to you.
 

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