Electron densities and energies of a guided argon streamer in argon and air environments
作者： S Hübner , S Hofmann , E M van Veldhuizen , P J Bruggeman
DOI: 10.1088/0963-0252/22/6/065011
关键词: Electron density 、 Laser 、 Physics 、 Electron 、 Plasma 、 Head (vessel) 、 Pulse-width modulation 、 Atomic physics 、 Argon 、 Pulse (physics)
摘要: In this study we report the temporally and spatially resolved electron densities mean energies of a guided argon streamer in ambient air obtained by Thomson laser scattering. The plasma is driven positive monopolar 3.5 kV pulse, with pulse width 500 ns frequency 5 kHz which synchronized high repetition rate system. This configuration enables us to use spatial temporal stability accumulate multitude laser/plasma shots triple grating spectrometer equipped an ICCD camera determine parameters. We found strong initial ne-overshoot maximum 7 × 1019 m−3 energy 4.5 eV. followed fast decay toward channel. Moreover, 2D distribution density exhibits peculiar mushroom-like shape head diameter significantly larger than that emission profile. A correlation expected pre-ionization channel found.
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