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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