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Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
I am building a medium power DRSSTC and need a 24"x6" toroid for the topload but can't afford to spend $350 on one but still want a toroid that is an interesting visual aspect of the coil as well as the actual electrical role so for a while I was stumped as to what I should do. However, after seeing the pipe toroid Finn Hammer used for his Thumper coil, I decided to try and apply the same technique to my coil. My question is as follows: is the capacitance of a toroid like Finn's equal to the sum of the capacitance values of the respective rings? If so, what is the cross section diameter of the whole toroid? Is it equal to the cross section of the individual pipe rings? Thanks!
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Im currently building similar toroid but instead of using few rings of thick pipe im going for several (30) rings of thinner round wire.
Few things about toroid surface integrity (or smoothness) are bothering me with this desing. Here is what i think after doing some testing and reading stuff from internet: (please correct me if im wrong)
- If toroid is small/medium size compared to rest of the coil it has to be very smooth
Toroid surface integrity is not critical if it has large enough ROC compared to height of an average surface features that are "sticking out" from imaginary perfect round surface. Other important thing is to desing toroid large enough that coil just barely power to break out with single streamer.
Btw toroid i started to build has major diameter of 150cm and minor 40cm :)
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Awhile back ago I saw someone put plaster on corrugated heating duct. they did multiple layers and smoothed it out, and the finished project was a smooth toroid. They then covered it in aluminum tape, and it looked really nice. I cant recall the site name or who it was at this moment...
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Is it really important using a topload with a completely smooth surface?
I know that a corrugated surface increases corona effect but I wonder if the actual performance is really affected by such increase of corona losses...
On the other hand, a smooth toroid is really cool!
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Luca wrote ...
Is it really important using a topload with a completely smooth surface?
I know that a corrugated surface increases corona effect but I wonder if the actual performance is really affected by such increase of corona losses...
On the other hand, a smooth toroid is really cool!
Regards,
Luca
Smooth toroids are not necessary. They do look better though.
Ed Wingate's famous magnifier use corrugated duct pipe covered with aluminum tape and rocked the house with at least 10-15 foot arcs, and i've seen individuals (photos) in Richard Hull's TCBOR group using things as diverse as Turkey Pans and Ventilation Caps for top loads.
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
Kizmo wrote ...
Im currently building similar toroid but instead of using few rings of thick pipe im going for several (30) rings of thinner round wire.
Few things about toroid surface integrity (or smoothness) are bothering me with this desing. Here is what i think after doing some testing and reading stuff from internet: (please correct me if im wrong)
- If toroid is small/medium size compared to rest of the coil it has to be very smooth
Toroid surface integrity is not critical if it has large enough ROC compared to height of an average surface features that are "sticking out" from imaginary perfect round surface. Other important thing is to desing toroid large enough that coil just barely power to break out with single streamer.
Btw toroid i started to build has major diameter of 150cm and minor 40cm :)
As far as the size of the toroid vs the size of the coil and the effect on how smooth the thing has to be I think I am good. My seconday is roughly 6.25"x25". What is ROC? What is the chord/cross section diameter for a pipe toroid that is used in ScanTesla? How are you securing the wires to the frame of the toroid? The coil you are building the toroid for must be a monster!
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Toroids: Conventional vs. Pipe Sections
