Dielectric gas - Nitrogen

The spark gap or "Marx" gas used by the Febetron is pressurized Nitrogen (or air which is 78% nitrogen). The reason for using a pressurized gas is that it enables the manipulation of the breakdown voltage of the spark gaps simply by adjusting the pressure of the gas in the module column chamber.

Shown below are graphs of Nitrogen breakdown voltage vs. Pressure for small spherical electrodes

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