Re: 20 joules at 100 bps vs 4 joules at 500 bps

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

Hi "father dest" (a name would be great ;),
                                            Sorry for not replying to
this earlier.

On 19 Jul 2005, at 8:12, Tesla list wrote:

> Original poster: "father dest" <dest@xxxxxxxxxxx>
>
> hi Malcolm.
>
>  > Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
>
>  > Careful! Except in a trivial case noted below there is no
>  dependency > between toroid "size" and breakout voltage.
>
> ok ok - i`m just a beginner, very beginner, so be a slightly indulgent
> :-) then one more time:
>
>  >- make the secondary tall/long enough that it will not flashover
>  with >the maximum Ep that will be thrown at it >- make the topload
>  ROC such that the coil will barely breakout with >the maximum voltage
>  it will develop with a maximum bang size
>
>  >Bang size is all-important. It is a major determinant of output
>  voltage for >one thing (assuming a suitable ROC for the topload). It
>  also maximizes >energy dumping into a growing leader
>
> i understand ethings about energy - the more - the better, as for the
> ROC - it`s understandable too - to avoid corona loses and to get a
> discharge only after full energy transfer from primary to secondary.
> but what`s the use of too high voltage across the secondary?

None as you say.

> we can
> decrease it by picking up a larger toroid, it =had to be decreased= at
> high Ep, coz as H:D can`t be increased infinitely. and we don`t want
> any flashovers - do we? :-)

Right. On that basis energy can be increased more-or-less
indefinitely and Vo held constant (more-or-less).

> now instead of the "minimum bps" question i`m asking about minimum (at
> practical viewpoint) Vout - does it exist? but maybe it`s just as with
> bps - do we need some middle value? or we have to increase geometrical
> sizes and aspire to the maximum voltage? :-)

Maximum voltage the secondary can withstand without flashing over? I
would. Your original statement was:

Vout at given Ep is dependent from the toroid capacitance - its size, and
its size should be chosen according to Vout - dead end :-)

I do believe you can arbitrarily increase Ep and hence Es (and one
hopes, streamer length) without increasing (or for that matter
decreasing) Vo. Of course Pin also increases if the breakrate is held
constant (say at 100Hz or whatever).

Malcolm

> ---
> Your not coiling unless your blowing capacitors! Then when you get
> things worked out to where the capacitors stop blowing, you start
> blowing transformers. (c) Richard Quick 11-03-93 20:42
>
>
>