Re: Safety FAQ-discharge classification
In a message dated 96-08-22 01:06:04 EDT, you write:
If we place a small "bump" on the toroid (per Richard Hull), and repeat
the experiment, streamers will now originate from BOTH the toroid and
the grounded object. Once a complete path is formed, the narrowest
portion would be somewhere in the middle, resulting in a much brighter
middle region. As the current flows through the thicker paths back
toward the roots, the spark intensity would be reduced, leaving markedy
"brighter" segments in the middle of the arc path.
As long as the discharge repetition rate is relatively low, most of the
secondary energy will be rapidly dissipated in a single (VHF) spark
discharge, and the ionized path will not have a chance to widen much
before all of the electrostatic energy is dissipated. Along the lines of
Malcolm's observations, with lower coupling coefficients, the streamers
tend to be more "spindly", with more branching/forking. More prevalent
smaller forks mean more lower current smaller diameter paths at the
ends. These would tend to be significantly brighter once the large
discharge current flowed, making the phenomenon more observable under
these circumstances.... Then again, I could be wrong!
Comments, flames, etc are welcomed!!
-- Bert --
It sounds good to me. When I am tuning my coil, I set up a ground rod about
four feet from the toroid and wrap a short piece of bare copper wire around
it facing the coil. Then I lay a wire on the toroid facing the ground rod.
The discharges between the two points are very hot and thick. The brightest
spot is a few inches wide in the middle. I use this for tuning and try to
maximize the width of the hot spot.