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Title

HV discharge acceleration by sequences of UV laser filaments with visible and near-infrared pulses

Authors
Rastegari, Ali
Feng, Chengyong
Kamer, Brian
Arissian, Ladan
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Published in New Journal of Physics. 2017, vol. 19, no. 12, p. 123040
Abstract We investigate the triggering and guiding of DC high-voltage discharges over a distance of 37 cm by filaments produced by ultraviolet (266 nm) laser pulses of 200 ps duration. The latter reduce the breakdown electric field by half and allow up to 80% discharge probability in an electric field of 920 kV/m. This high efficiency is not further increased by adding nanosecond pulses in the Joule range at 532 nm and 1064 nm. However, the latter statistically increases the guiding length, thereby accelerating the discharge by a factor of 2. This effect is due both to photodetachment and to the heating of the plasma channel, that increases the efficiency of avalanche ionization and reduces electron attachment and recombination.
Keywords High-voltageDischargeUltrashort laserUltravioletInfraredVisibleFilament
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Research groups ISE Climat
Groupe Kasparian
Project FP7: FILATMO
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SCHUBERT, Elise et al. HV discharge acceleration by sequences of UV laser filaments with visible and near-infrared pulses. In: New Journal of Physics, 2017, vol. 19, n° 12, p. 123040. https://archive-ouverte.unige.ch/unige:101094

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Deposited on : 2018-01-03

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