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*To*: tesla-at-pupman-dot-com*Subject*: Re: spark gap voltages (Secondary capacitance)*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 23 May 2002 18:19:11 -0600*Resent-Date*: Thu, 23 May 2002 18:46:12 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <C-yROD.A.KwH.S1Y78-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br> Tesla list wrote: > Original poster: "Dave Larkin by way of Terry Fritz <twftesla-at-qwest-dot-net>" <teslaman15-at-hotmail-dot-com> > A small DC supply is used to charge the primary cap, until the spark gap > breaks down. The output spark length under these conditions _is_ (almost) a > direct relation of voltage. So if a ground terminal with a large ROC (to > try and make the field a bit more uniform) is used and the single shot spark > length measured, one can determine the approximate output voltage, using the > fact that air breaks down at ~1MV/meter for large gaps. The correct figure is 30 kV/cm for parallel planes, or terminals where the radius of curvature (R) is much larger than the distance between the terminals (D). When D>>R the voltage tends to be determinated by R only, as V=60000/R (R in cm, assuming 2 identical balls). An approximate expression for the voltage between 2 balls with radius R and distance D is: V=30000*R*D/(0.9*(R+D/2)), R and D in cm. A spark with 20 cm of length between two balls with 2 cm of radius corresponds to about 111 kV. Of course, this is for single sparks. Antonio Carlos M. de Queiroz

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