Cross-correlation spectroscopy study of the Transient Spark discharge in atmospheric pressure air

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Publikace nespadá pod Pedagogickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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JANDA Mario HODER Tomáš SARANI Abdollah BRANDENBURG Ronny MACHALA Zdenko

Rok publikování 2017
Druh Článek v odborném periodiku
Časopis / Zdroj Plasma Sources Science and Technology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://iopscience.iop.org/article/10.1088/1361-6595/aa642a
Doi http://dx.doi.org/10.1088/1361-6595/aa642a
Obor Fyzika plazmatu a výboje v plynech
Klíčová slova cross-correlation spectroscopy; transient spark; streamer-to-spark breakdown mechanism; atmospheric air discharge
Popis A streamer-to-spark transition in a self-pulsing transient spark (TS) discharge of positive polarity in air was investigated using cross-correlation spectroscopy. The entire temporal evolution of the TS was recorded for several spectral bands and lines: the second positive system of N2 (337.1 nm), the first negative system of N2+ (391.4 nm), and atomic oxygen (777.1 nm). The results enable the visualization of the different phases of discharge development including the primary streamer, the secondary streamer, and the transition to the spark. The spatio-temporal distribution of the reduced electric field strength during the primary streamer phase of the TS was determined and discussed. The transition from the streamer to the spark proceeds very fast within about 10 ns for the TS with a current pulse repetition rate in the range 8-10 kHz. This is attributed to memory effects, leading to a low net electron attachment rate and faster propagation of the secondary streamer. Gas heating, accumulation of species such as oxygen atoms from the previous TS pulses, as well as generation of charged particles by stepwise ionization seem to play important roles contributing to this fast streamer-to-spark transition.
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