Electrostatic Deflection in a DIY Particle Accelerator

I show electrostatic deflection using some 1.5 volt D batteries on a modded CRT TV to turn it into a DIY particle accelerator. Sorry if you cannot see the dot move very well but trust me it moves a noticeable amount in real life. Try playing the video full screen and in HD to more clearly see the dot.

[popo_]

This kid just bent light with a magnet. Pretty impressive.

[jpu]

come to think about this, It still is electrostatic deflection, but the fact that it's a battery is immaterial. The charge is likely building up on your body, and the battery is merely a conductor of the charge you accumulated with your sneakers, or on you from the TV itself, etc. You could be more systematic & experimental by charging up II external plates, measure their capacitance with an RLC meter (or a time constant w/an RC circuit) so you can quantify how parallel plates store charge, etc.

[KallePihlajasaari]

That is a cool demo but I think it is residual magnetism in the metal nail anode in an alkaline battery. There should be no effect through the glass and aquadag from a few volts of external field that is capacitively coupled to not much of anything.

[quicknuclearscience]

They would be the same, as far as I know, just there would only be one gun (for one color) and the circuits would operate the gun differently.

[quicknuclearscience]

Well inside the glass yes it defiantly is possible, has been done millions of times. Outside the TV you must put the plates over the glass where there is no conductive paint otherwise the pailt will make it so that the field doesn't get through.

[quicknuclearscience]

No, if you take apart an oscilloscope CRT you will see no yoke (electromagnet) but two plates on either side of the beam. Putting a potential on the plates causes the dot to move. The voltage creates a field that attracts the electrons on one side and repels them form the other. The reason you hardly see anything is because the voltage im using (1.5v) is too low.

[quicknuclearscience]

@funguyround you could look at the cyclotron kids website just search google. They are trying to build a cyclotron, a type of circular particle accelerator. You will need some source of particles and high voltage to accelerate them. A vacuum pump and some high quality pyrex tubing will also be necessary if you intend to have a linac start the beam and send that around a ring. It would be very difficult but not impossible.

[quicknuclearscience]

Interesting. I may test this again with an black and white tv, and try to measure if there is any current flowing. If it is not electrostatic deflection what else could it be?

[jpu]

This does not look like an example of electrostatic deflection. ( I didn't see any evidence of any current flowing from your batteries) You'd be better off finding the CRT out of an old oscilloscope that actually has the electrostatic deflectors built into it. With the right set-up, you could make some pretty interesting measurements, like the mass-to-charge ratio of an electron.

[TheCRTman]

So you put a positive voltage on one side and a negative on the other. Do you know how electrostatic deflection yokes are made for vector xy monitors?

[quicknuclearscience]

@mjjmal1 sorry thats my cameras bad mic. it doesn't have a place to plug in an external one so i'm stuck with what i've got.

[quicknuclearscience]

Not a bad idea, I will have to get around to testing this.