Re: (no subject)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Bert Hickman <bert.hickman@xxxxxxxxxx>

Tesla list wrote:

> Original poster: Mddeming@xxxxxxx
> Hi All,
>     Does anyone know of a sound reason why the secondary coil form 
> cannot/should not extend upward through the toroid so that the toroid 
> fits around it like a fat ring on a finger?
> I would prefer not to cut this 6" x 72" clear acrylic pipe at this time.
> Matt D.

Matt,

If the PMMA coil form extends significantly above the toroid, you may 
encounter a problem with sparks forming and tracking along the outer 
surface of the coil form above the toroid. The higher dielectric constant 
of the PMMA (~3.6) causes significant E-field enhancement at the point 
where the toroid, air, and PMMA all come together. Corona and sliding 
discharges (along the PMMA surface) may then want to originate at this 
"triple point". However, offsetting this is the overall shielding effect of 
the rest of the toroid, so you may not encounter this problem. Try it and 
let us know!  :^)

Best regards,

Bert

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