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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi guys, I have one speculative idea which I’d like to ask you for comments. I’m thinking about a triggered spark gap which would be based on a strong UV light source (like Hg lamp 150W at least). The beam from the lamp would be directed to the spar-gap and rotating disc with wholes would be placed in the path of the beam. Now the question – do you somebody knows if this would work and how big is the decrease in the air resistance when is ionized by this kind of UV source. The point is whether I’m able to achieve exept the triggering also an increase of the spark gap effciency (means less heat production)
Thanks for comments
For REACHING: I thougt that triggering by UV light emmision is principle of Marx generator spark gaps. Am I wrong? And you have also laser trigered spark gaps that's also light...
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
you cant ionize air by just using a light source.. you can help ionizing the air with a strong uv source, but i doubt you will be able to just trigger a spark gap with light
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
UV triggering is a big factor in the triggering of Marx gaps, but you have to remember that a spark like that is emitting orders of magnitude more UV light than a 150W Hg bulb.
Plus it is released from an insanely small volume (the arc channel), whereas a 150W Hg lamp would be considerably larger, thus hugely reducing the energy density.
Energy density is what it's all about. Like with laser triggering as you mentioned, only a small amount of energy focused down to a spot a few microns across will ionize the air (see people here making SSY-1 lasers and similar).
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Well, for refrence, when those ssy-1 lasers ionise air the peak power is about 10MW (capital M), which when focused down to a 10 mils spot (not sure exactly how small the beam needs to be to initiate the ionisation, 10mils seems about right but it could be down in the microns) you get a power density of about 100 GW/in^2
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question about UV triggered spark gap
