Previously I tested out the electron gun and I didn’t see a beam on the phosphor. I wanted to rule out the possibility that there WAS a beam, but it wasn’t hitting the phosphor screen. By moving the screen closer I can see the beam no matter where it is pointed.
So I designed and printed this sweet phosphor holder:
I have a small piece of broken phosphor glass from the CRT. I used the excellent OpenSCAD polygon editor to make a form fitting mount:
In real life:
That was easy!
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You still need a ground connection to the phosphor to drain electrons, electrons hitting the phosphor will charge it up as a capacitor plate and it will repell all electrons, no matter what acceleration potential you have.
Steve
Steve, thank you for this comment!
That makes perfect sense, but I never would have thought of it.
How does the plastic behave in vacuum? Has it is made by piling lots of ABS strings, maybe the degassing will prompt torsioning and breakup of the piece??