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Abstract |
Laser Thomson scattering diagnostics has been developed for the study of the streamer moving toward the cathode in helium near atmospheric pressure. In order to avoid laser perturbation and obtain suf...ficient intensity of the Thomson scattering signal, two cylindrical lenses were used to optimize the spot size of a probing laser at a focusing point. At a position of 2 mm from the anode (needle electrode), the electron density and electron temperature were successfully measured to be ~ 10^18 m^-3 and ~ 2 eV, respectively, in the initial stage of the primary streamer.show more
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