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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
I found that by getting longer sparks by opening up my spark gap and adding larger top load, I had to add a strike ring to save my NST. Is there a way, by electrostatic shielding perhaps, to direct the sparks away from my primary?
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Hazmatt: What are the specs on any of your coils that achieve 3 feet of spark per 1J bang energy? If this is true, then its truly a feat that no one else has managed. Typically, a 1J bang energy at 120 times a second (say a SRSG system) would only produce about 15" sparks. 1J bangs at an even lower rate (so low that streamers dont build off of eachother) would produce even smaller sparks.
Anyway, going on some of the specs you post, figuring a 12kVAC input (so ~20kV charging) and an 18nF cap, thats 3.6J per bang. I would expect such a system to produce about 3 foot sparks once well tuned.
So im curious what parameters your coil has that produces your claimed results.
After doing many single shot tests with my DRSSTCs (which are fairly efficient, and behave similarly to SGTCs), i find that spark length is highly dependent on not just bang energy, but repetition, which really equates to power input. I also find that the spark length goes up with the root of the input power (or bang energy * bangs per second). And this isnt just my hypothesizing... many others find this to be true in real tests.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I was calculating my energy at the peak voltage input because that's when the system was discharging, so V=12,000, C=18nF (or 16), but for 18nF I get 1.3J. And the transformer current limits at ~60mA, so I had 750VA.
What troubles me now is this doesn't take into account of the topload, which is important. I'm going to have to rethink what I'm advocating.
I'm really starting to hate these things because you really can't reduce it to one quality factor can you! Damn Synergy! >.<
I think im going to stop here because you guys are right to want some numbers and I just don't have that information right now. It was all calculated 'back of the envelope' a while back to get my operating points. After that I damaged the NST, but I had all the numbers I needed to move forward. All I have now are some basic stats and a video on youtube. I would measure the coil and do all of that again, but its at college right now waiting for a rewind and to be finised.
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Coil to Spark Length Ratio
