Observation of a comb-shaped filamentary plasma array under subcritical condition in 303-GHz millimetre-wave air discharge
Observation of a comb-shaped filamentary plasma array under subcritical condition in 303-GHz millimetre-wave air discharge
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亚临界条件下 303 GHz 毫米波空气放电梳状丝状等离子体阵列的观测
DOI:
10.1038/s41598-019-54333-5
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发表时间:
2019
影响因子:
4.6
通讯作者:
Saito Teruo
中科院分区:
文献类型:
--
作者:
Fukunari Masafumi;Tanaka Shunsuke;Shinbayashi Ryuji;Yamaguchi Yuusuke;Tatematsu Yoshinori;Saito Teruo
Gas breakdown in the millimetre-wave frequency band is an interesting phenomenon in nonlinear dynamics such as self-organized structure formation. We observed the transition between two types of filamentary plasma arrays in air discharge driven by a 303-GHz millimetre wave. Plasma is ignited at a parabolic mirror’s focal point in the overcritical condition. One array parallel to the electric field vector appears with a spacing of λ/4 at the focal point. Filaments then separate into plasma lumps ~10 μs after ignition. At 20 μs, a new comb-shaped array grows in the subcritical condition. Filaments are parallel to the incident beam with spacing of 0.96 λ and elongate towards the incident beam. This comb-shaped array appears only in the electric field plane; bulk plasma with a sharp vertex forms in the magnetic field plane. This array is created by a standing wave structure generated by waves diffracted from the plasma surface. Filamentary plasma array formations can influence the energy absorption by the plasma, which is important for engineering applications such as beamed energy propulsion.
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