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Re: [TCML] Frequency content of arcs vs sparks

this is more complicated 
pressure plays role 
or penning ionization plays role at high pressures in order to get uniform plasma
at atmospheric pressure if you apply a dc voltage to electrode you get corona increase voltage glow increase current arc 
if you dont want arc use dielectrics between electrodes
if you helium or argon between electrodes you get plasma at atmospheric pressure
increasing frequency lowers the applied voltage if you want to get plasma or corona or arc
at low pressure apply dc high voltage you get dc glow
increase frequency you can lower the applied voltage to get plasma 

Lutfi Oksuz

--- On Fri, 8/6/10, bturner@xxxxxxxx <bturner@xxxxxxxx> wrote:

From: bturner@xxxxxxxx <bturner@xxxxxxxx>
Subject: Re: [TCML] Frequency content of arcs vs sparks
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Friday, August 6, 2010, 2:15 PM

>From what I understand, the arc discharge (especially arc's to ground,
etc) is quite ripe with exremely high frequency transients. Consider that
the torroid (or topload) has finite capacitance, the arc channel has
resistance and inductance (extremely small), and as such, forms yet
another type of crude spark-gap oscillator.

High break rates in the conventional primary really only mean that the
'arc' oscillator is recharged more often. Perhaps if you were able to
induce a harmonic content for resonance with that arc discharge, but it's
way up in the order of megahertz...

A continuous 'plasma' discharge in the conventional sense does not
oscillate as it is a continuously ionized path having extremely LOW
impedence. This is why neon-sign transformers have current-limiting

- b

> Hello all, not sure if this is exactly on topic, but I figured if there's
> a group of people who would know the answer, its you guys.
> Lets say we have a simple, single-shot DC electric discharge. This
> produces a broadband response in the frequency domain. What happens as we
> increase the discharge frequncy (the "breaks per second")? From say, once
> per minute, to once per second, to kilohertz, to megahertz? Basically,
> what is the frequency content of say, a 100 MHz electric discharge (at say
> 1 Hz, each pulse stands alone and produces a wideband frequency response,
> but what happens as the bps increases and one event "blurs" into the next
> [a kind of intersymbol interference])?
> Along a similar line, is there a difference, frequency-content-wise,
> between a spark and an arc (an arc being a continuous sustained plasma
> channel)? And how does oscillation frequency factor in?
> Thanks,
> -Patrick
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