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In this paper, a 105GHz millimeter wave interferometer system is used to measure the electron density and temperature of an atmospheric pressure helium plasma driven by submicrosecond pulses. The peak electron density and electron-neutral collision frequency reach 8×1012cm−3 and 2.1×1012s−1, respectively. According to the electron-helium collision cross section and the measured electron-neutral collision frequency, the electron temperature of the plasma is estimated to reach a peak value of about 8.7eV.

Electron density and temperature measurement of an atmospheric pressure plasma by millimeter wave interferometer