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Re: Optimal toroid elevation



Hi Marco, 

I was just doing similar test. I think most coilers who do not use a corona
ring position the toroid relatively close to the top plane of the secondary
winding, otherwise a considerable amount of corona and possibly breakout form
the top winding is possible. However, if your surroundings permit, then I would
recommend raising the toroid in conjunction with a corona ring since this will
raise the top capacitance value and get you nearer to your intended design. You
gain distance between sparks and primary as well. Jeff Parisse gave some good
numbers in his post for you as a guide to go by. 

I have a question here regarding the corona ring. Does it get connected with
the toroid or just sit in the field? 

Marco, you may want to consider making the toroid movable up and down. Malcolm
posted in a reply this week about fine tuning the resonator simply by raising
or lowering the toroid. Makes a lot of sense to me. 

Take care, 
Bart 

Tesla List wrote: 
>
> Original Poster: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi> 
>
> Hello all. 
>
> Can anybody please give me some hints about how much should be the distance 
> between the top of the secondary coil and the middle point of the toroid 
> for the 
> Thor coil? 
>
> The Thor secondary is 70" tall, winding is 59" long (about 4" left between
> top 
> turn and top of the secondary form). 
>
> The toroid is 59" outer diameter, the aluminium duct used is 7.9" diameter. 
>
> I thought to rise the toroid about 15" - 20 " over the secondary top: any 
> comments about that? 
>
> Should I use also an anti-corona smaller toroid near to the last top
> secondary 
> turn? 
>
> Regards