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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
GluD wrote ...
A large Van de Graaff generator could do it too.
The following is taken from wikipedia:
The largest air-insulated Van de Graaff generator in the world, built by Dr. Van de Graaff in the 1930s, is now on permanent display at Boston's Museum of Science. With two conjoined 4.5 meter (15 foot) aluminium spheres standing on columns 22 feet (6.7 m) tall, this generator can often reach 2 MV (2 million volts).
Thus I would add the Van de Graaff generator to the list of 'suspects'. I assume the 5 MV generator is insulated with sulfur hexaflouride, which should be do-able for a serious hobbyist.
Maybe, but I go there a lot and don't find it very impressive. It stands floor to ceiling with two columns and conjoined spheres about 50' tall. So it's phisicsl size detracts from the size of the sparks produced. But the demo guy has a clone of Steve's drsstc 2 which is indeed very impressive.
I would go with a marx as well. Or a vm, but the corona on an ac vm would be extremely lossy as pointed out.
Tom: both Steve ward and Eric goodchild both have been doing work recently that points out that the topload voltage on a drsstc isn't quite as it seems. it's blatently obvious on a qcw, but that helped us to begin to question the ~10kv/cm rule. Even the largest drsstcs probably. Ever have more that a couple hundred thousand volts max.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
ben123324 wrote ...
But the demo guy has a clone of Steve's drsstc 2 which is indeed very impressive.
What, do they have a DRSSTC installed at the museum alongside the giant VDG? That's quite cool
On the 10kV/cm thing: Years ago, I had one of the first Tesla coils capable of single shots with accurately controlled bang energy. I found that the spark length for a single shot was in reasonable agreement with the peak voltage estimated from simulation, and the tables given in most high voltage textbooks for a spark between pointed electrodes. Most of my coils could also break out without a breakout point, and that gave another data point for calibration, since the field strength at the surface of a toroid can be calculated from its dimensions.
When the coil is fired repetitively, or with a single very long burst like the QCW, then the spark gets longer still for a given peak voltage.
From my experiments I think the output voltage of DRSSTCs is probably in the range between 120kV for a tabletop one, 250kV for a medium sized unit and 500-750kV for an IGBT brick-powered monster. I don't think there are many Tesla coils around capable of producing an honest 1MV peak output voltage.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
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Posts: 837
anokata wrote ...
tpulse=10-150nS Iforward=5-50Amper for СДЛ 0.4 1600
That sounds a bit low, assuming the semiconductor area is on the order of 1 cm2 (the diameter of the diode pole is 16 mm) that's much less than the patent you linked suggests it could handle (single to low double digits of kA).
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Steve Conner wrote ...
ben123324 wrote ...
But the demo guy has a clone of Steve's drsstc 2 which is indeed very impressive.
What, do they have a DRSSTC installed at the museum alongside the giant VDG? That's quite cool
On the 10kV/cm thing: Years ago, I had one of the first Tesla coils capable of single shots with accurately controlled bang energy. I found that the spark length for a single shot was in reasonable agreement with the peak voltage estimated from simulation, and the tables given in most high voltage textbooks for a spark between pointed electrodes. Most of my coils could also break out without a breakout point, and that gave another data point for calibration, since the field strength at the surface of a toroid can be calculated from its dimensions.
When the coil is fired repetitively, or with a single very long burst like the QCW, then the spark gets longer still for a given peak voltage.
From my experiments I think the output voltage of DRSSTCs is probably in the range between 120kV for a tabletop one, 250kV for a medium sized unit and 500-750kV for an IGBT brick-powered monster. I don't think there are many Tesla coils around capable of producing an honest 1MV peak output voltage.
What about phasing 2 of them in a duel setup like the geek groups Gemini? that could work?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Well, that's cheating! +/-500kV relative to ground is a lot easier to generate than a single output of 1MV. Mike "Electric Stuff" Harrison did it years ago with a pair of Marx generators.
But anyway this thread is about DC. Glassman's biggest HV power supply is available special order with a 450kV output, but we're still a bit short.
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how to get 1 megavolt
