Xenon Spider
alan sailer, Wed Mar 01 2017, 11:11PMI have been working a lot lately on plasma globes/tubes.
This is a video showing the formation of a cool xenon spider. The video is shot at 2000 fps and shows the evolution of the discharge from a more conventional xenon filament discharge to a strange tendril glow. It behaves just like ferrofluid and a magnet.
Cheers.
Re: Xenon Spider
Hydron, Thu Mar 02 2017, 02:09PM
that looks fantastic, thanks for sharing it
Hydron, Thu Mar 02 2017, 02:09PM
that looks fantastic, thanks for sharing it
Re: Xenon Spider
Sulaiman, Thu Mar 02 2017, 03:28PM
I spent ages playing with a ccfl inverter and a xenon flash tube;
it must be that p.d is low enough that, at low current, the arc tries to lengthen itself by curling into a helix :)
I believe you Mr Paschen !
Sulaiman, Thu Mar 02 2017, 03:28PM
I spent ages playing with a ccfl inverter and a xenon flash tube;
it must be that p.d is low enough that, at low current, the arc tries to lengthen itself by curling into a helix :)
I believe you Mr Paschen !
Re: Xenon Spider
Justin, Fri Mar 03 2017, 01:05AM
That looks amazing
Justin, Fri Mar 03 2017, 01:05AM
That looks amazing
Re: Xenon Spider
alan sailer, Fri Mar 03 2017, 02:58AM
Sulaiman,
Yes arcs in xenon flashtubes are amazing. I have a longer tube form a high power YAG laser that has really fantastic structure when excited with HV AC. This tube also
has a prominent after glow that I can't explain.
As far as the filament structure, that curving wavy line I believe Carl Willis is correct when he blames it on convection currents. Of the three gases that
I've used in plasma tubes, neon has the least filament structure ven at high pressure, krypton better at 100 torr or so and good old xenon looks fantastic at 50 torr.
When you look at the thermal conductivity of these three it's right in line with the effect.
This is the same globe, normal video with some narration.
Cheers.
alan sailer, Fri Mar 03 2017, 02:58AM
Sulaiman,
Yes arcs in xenon flashtubes are amazing. I have a longer tube form a high power YAG laser that has really fantastic structure when excited with HV AC. This tube also
has a prominent after glow that I can't explain.
As far as the filament structure, that curving wavy line I believe Carl Willis is correct when he blames it on convection currents. Of the three gases that
I've used in plasma tubes, neon has the least filament structure ven at high pressure, krypton better at 100 torr or so and good old xenon looks fantastic at 50 torr.
When you look at the thermal conductivity of these three it's right in line with the effect.
This is the same globe, normal video with some narration.
Cheers.
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