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Really large plasma tubes

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zrg
Sun Apr 26 2015, 03:52PM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Finally had first light of this thing. 7' 4" (2200 mm) plasma tube, 270 mm diameter. Over 30 kg of borosilicate glass evacuated and then filled with proper inert gas mix. Power supply is a homemade proper high voltage ferrite transformer and a halfbridge from mains. Power consumption is about 300W.
5 more similar size tubes with different colors (green, red, yellow, turquoise, multicolored) to go. Will post updates when/if they're done, but that's not soon, such glass things are too difficult to work with smile

1430063476 4762 FT0 Img 0616

1430063476 4762 FT0 Img 0617

1430063476 4762 FT0 Img 4481

1430063476 4762 FT0 Img 4484

1430063476 4762 FT0 Img 4485

1430063476 4762 FT0 Img 4487

1430063476 4762 FT0 Img 4489
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Kizmo
Sun Apr 26 2015, 04:17PM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Very cool! I would love to have one but i think they are too difficult to ship cheesey
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Dr. H.
Sun Apr 26 2015, 05:43PM
Dr. H. Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
Beautifuuuul :)

Do you mind shearing what the gas mixtures are smile
Hope to see the other colors soon.

Can you modulate the length of the discharge to some point ? If so you can make something like a giant discharge VU meter.

Cheers
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teravolt
Mon Apr 27 2015, 01:36PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
do you plan to sell these
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Mads Barnkob
Mon Apr 27 2015, 06:10PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
That does indeed look sweeter than sweet!

I think I can see 3 seams, so you glass welded these together from 4 different pieces?

Is there only a small discharge terminal at the bottom of the tube? I am not sure if it is just the reflections showing a blue glow at the top.
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zrg
Tue Apr 28 2015, 12:00AM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Mads Barnkob wrote ...

That does indeed look sweeter than sweet!

I think I can see 3 seams, so you glass welded these together from 4 different pieces?

Is there only a small discharge terminal at the bottom of the tube? I am not sure if it is just the reflections showing a blue glow at the top.

This one made from two pieces.

Single terminal at the bottom.

Here are some photos made during evacuation and filling.



1430179159 4762 FT170923 Img 0577

1430179159 4762 FT170923 Img 0589

1430179159 4762 FT170923 Img 0602

1430179159 4762 FT170923 Img 0607

1430179159 4762 FT170923 Img 4378

1430179159 4762 FT170923 Img 4386

1430179159 4762 FT170923 Img 4390

1430179159 4762 FT170923 Img 4395

1430179159 4762 FT170923 Img 4418

1430179159 4762 FT170923 Img 4430

1430179159 4762 FT170923 Img 4439

1430179159 4762 FT170923 Img 4449
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Intra
Tue Apr 28 2015, 12:50PM
Intra Registered Member #2694 Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
Magic... *_____*
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klugesmith
Tue Apr 28 2015, 05:54PM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
Magnificent work. Are they for museums, or fairs, or just your friends?
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zrg
Tue May 05 2015, 06:06PM
zrg Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Tube was presented at the local science-related festival for children, along with same size green-white, and smaller red and yellow ones, and other our stuff (plasma balls, jacob ladder, tesla coil, even smaller tubes etc). Some nice photos, oh yeah. Everybody likes nice photos, I hope. Sorry for direct link images, uploading somehow shows an error message and doesn't work today for me.

klugesmith wrote ...

Magnificent work. Are they for museums, or fairs, or just your friends?

All mentioned smile

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88C61N2MMZo

IsvARpE7ygQ

GEG9xPB2xmE

XIxSgDZuXIQ

WAuw77Jydt4

HeHQqu4rwz8

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UI

Yb5Oazc
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