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Re: TC Electrostatics (fwd)
---------- Forwarded message ----------
Date: Mon, 02 Dec 1996 08:20:26 -0500
From: Dan Kline <ntesla1-at-vishnu.csd.sc.edu>
To: chip-at-pupman-dot-com
Subject: Re: TC Electrostatics
>From: huffman <huffman-at-fnal.gov>
>To: tesla-at-pupman-dot-com
>Subject: Re: TC Electrostatics
>
>I saw an interesting thing while firing my coil on the work bench. An
>article from a magazine was hanging from a hook about 20" from the
>discharge electrode. When the coil was operated the paper pulled itself to
>the pegboard clearly do to electrostatic charge. It's amazing how much
>static these things put out.
>Dave
and
[snip]
>There's also
>strong empirical evidence that disruptive (but not CW) coils
>electrostatically "charge up" operators in a similar fashion, so there
>also appears to be some interaction(s) associated with the higher peaks,
>relatively low duty cycle, or damped wavetrains. But just how does this
>all fit together?? This is really interesting stuff!!
>
>BTW, could you determine if the plate became positively or negatively
>charged?
>
>-- Bert --
My guess would be that plate was positively charged.
Could it be like this:
Let's say that we are going to fire a coil one time, say 1 "pulse", and the
coil will ring down in 5 complete cycles. Let's also say that the first
half-cycle, i.e. the first and highest voltage rise, will be positive in
nature. In other words, the ionic output at the secondary's terminal will be
positive. This is only for the first half-cycle.
The following half-cycle, will be negative, i.e. the ionic output will be
negative.
The total cycle above will equal one "ring."
The next half-cycle will be positve, the next following half-cycle will be
negative, and so on until all five cycles have been completed, and the coil
has completely rung down.
>From what I *pretend* to understand ;) positive ions lack electrons, and
negative ions have a surplus of electrons. In that case, in the first
half-cycle, the positive ions would be accelerated farther away from the
secondary's terminal than the following, heavier, and less-accelerated
negative ions during their next half-cycle. This would be on the first
completed cycle.
On the beginning of the next ring, the positive half-cycle would accelerate
the lighter, positive ions to about where the heavier negative ions had
stopped, neutralizing most of them. Then the succeeding negative half-cycle
would throw out more negative ions, heavy, and way less-accelerated, only to
be neutralized by the lighter positives on the next cycle. (I suppose the
positives could be accelerated *past* the negatives, but it really doesn't
matter for this analogy.) The process would continue until the coil had
completely rung down, leaving a cloud of positive ions far away from the
secondary's terminal, relatively speaking.
If we were to have successive wave-train of five-ring-pulses, (forgive me if
I'm mixing terms ;) then the positive ion-cloud at the far reaches of the
"coil-space" would continue to increase in size simply because the lighter
ions would propelled farther than the would-be-neutralizing negative ions.
5 cycles
+ - + - + - + - + ________________
+ + - + - + - + - + (____terminal____)
+ - + - + - + - + | |
| |
5 more cycles
+ + + - + - + - + - + ________________
+ + + - + - + - + - + (____terminal____)
+ + + - + - + - + - + | |
| |
...and 5 *more* cycles
+ + + + +
+ + + + + + - + - + - + - + ________________
+ + + + + - + - + - + - + (____terminal____)
+ + + + + + - + - + - + - + | |
+ + + + + | |
Something like that. :)
Of course, this is all just speculation, I'm no scientist. *laugh*
But I do think that the ions will be accelerated to a point where the
heavier negatives can't catch up. I'm also not sure about how to make the
first cycle positive...maybe power-supply phasing? On the other hand, it
could be that free electrons are being accelerated, since they're the
lightest of all. I'd be way interested in finding out what the usual
polarity-of-charge ends up being.
Just thinking out loud,
Dan