Rapid formation of electric field profiles in repetitively pulsed high-voltage high-pressure nanosecond discharges

被引:58
作者
Ito, Tsuyohito [1 ]
Kobayashi, Kazunobu [2 ]
Czarnetzki, Uwe [3 ]
Hamaguchi, Satoshi [2 ]
机构
[1] Osaka Univ, Frontier Res Ctr, Grad Sch Engn, Frontier Res Base Global Young Researchers, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Grad Sch Engn, Ctr Atom & Mol Technol, Suita, Osaka 5650871, Japan
[3] Ruhr Univ Bochum, Inst Plasma & Atom Phys, D-44780 Bochum, Germany
关键词
AIR; IGNITION; HYDROGEN;
D O I
10.1088/0022-3727/43/6/062001
中图分类号
O59 [应用物理学];
学科分类号
摘要
Rapid formation of electric field profiles has been observed directly for the first time in nanosecond narrow-gap parallel-plate discharges at near-atmospheric pressure. The plasmas examined here are of hydrogen, and the field measurement is based on coherent Raman scattering (CRS) by hydrogen molecules. Combined with the observation of spatio-temporal light emission profiles by a high speed camera, it has been found that the rapid formation of a high-voltage thin cathode sheath is accompanied by fast propagation of an ionization front from a region near the anode. Unlike well-known parallel-plate discharges at low pressure, the discharge formation process at high pressure is almost entirely driven by electron dynamics as ions and neutral species are nearly immobile during the rapid process.
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页数:5
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