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Re: corona (fwd)
Esondrmn-at-aol-dot-com wrote:
>
> In a message dated 97-03-03 23:49:25 EST, you write:
>
> << I recently took some photos of my coil in operation. When I got the
> photos back I noticed that all the pictures show a blue ring of corona
> on the ground ring around the primary and comming down from the top of
> the secondary. I have not noticed this while running the coil but it
> shows up on all of my photos.
>
> I understand that the corona from the top may be from having the
> torroid too high. Does any one have any ideas what may cause the corona
> on the ground ring? (It looks cool in the pictures but I doubt if it's a
> good thing)
>
> My coil configuration is as follows:
>
> 2 15kva neons
> 2 air wound and 2 ferrite core chokes
> copper tube vacuum quenched spark gap (8 tubes, .030 spacing)
> Primary -1/4" copper pipe with 3/8" spacing 12 turns
> Secondary - 6" acrylic wound with 22" of 24ga magnet wire
> Torroid - 4" dryer duct around a 24" pizza pan
> ground - very heavy welding cable (1/2" dia) connected to 1 8' copper
> plated ground rod
> >>
>
> Dave,
>
> Your coil sounds similar in size to mine. What you are seeing is the intense
> field coupling the primary energy to the secondary. I have seen this on mine
> as a perfect blue christmas tree formed from the outside of the primary up to
> the top of the secondary. This is most evident just before the toroid breaks
> out, in a dark room. You have good coupling and you will probably find it
> too tight if you try to raise the input power levels. As I increased power,
> the blue field increased in intensity and finally started to breakdown with
> discharges along its total length. Then I raised the secondary up about
> three inches to loosen the coupling.
>
> Ed Sonderman