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Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
ok, first to the Mods: I figured this thread would be best since it is the acceleration of ions, but feel free to move it elsewhere
the idea i need clarifying on: In a CRT TV, two Electromagnetic Coils deflect the accelerated beam of electrons to be able to hit any given point in a two dimensional plane, in a vacuum However, from what I understand, the same could be done if the electric potential was high enough, in a low pressure gas (such that the stream of ions causes the emission of light from the shift in energy levels of electrons in the atoms of the gas) and that these beams may also be manipulated in two dimensions using magnetic fields... so here is my idea, if one were to made a large, symmetric chamber, filled with a low pressure gas, and built like a CRT TV, BUT the chamber were to be made of glass or some transparent material, then the beam would be visible along the path... However, if an array of smaller, yet of decent power, magnetic coils were strategically placed around one half of the chamber's circumference, then the third set of magnets could deflect the stream of ions along a THIRD dimension, alowing some BASIC 3D figures to be made
i understand that the range of figures that could be made would be very limited, but it might make an interesting Senior Project for next year, and having seen on this forum how easy it is to make a Cathode ray Tube, and knowing that my school has a vacuum pump and some very willing-to-help-out teachers, I figure that maybe something might come out of it...
The main issue I am having with this is whether or not I could make multiple deflections in this third Axis, or if the magnetic coils (which are on opposite ends of the chamber, since no single coil could make the beam follow an "S" pattern) would interfere with each other in an unpredictable, or undesirable, manner...
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Deflection along the third dimension would mean that the beam would have to terminate at a certain point in the tube? Also, I don't think that you will be able to see the beam unless the tube were filled with a low pressure gas so that the electrons could collide with more atoms. Cool idea still. I might just be misunderstanding the idea of deflection in the third dimension.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
If you could see the beam, then how would 3d shapes be made? it would be a bunch of lines. What if you have several meshes covered in phosphor that you alternate the charge between?
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
I thought about the meshes, but figured it would be more complex.
the third dimension idea does not have the beam terminating at a given point (though that would be awesome) but allows, for example, an a-shaped curve that is visible while the beam can hit amy of the two dimensional points in a normal CRT TV at the end of the chamber
and in my above post I stated that the chamber would need a low pressure gas for a visible beam
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3 Dimensional Cathode Ray Tube
