Rapid breakdown mechanisms of open air nanosecond dielectric barrier discharges |
| |
Authors: | Ito Tsuyohito Kanazawa Tatsuya Hamaguchi Satoshi |
| |
Affiliation: | Frontier Research Base for Global Young Researchers, Graduate School of Engineering, Osaka University, Japan. tsuyohito@ppl.eng.osaka-u.ac.jp |
| |
Abstract: | The discharge initiation mechanism of nanosecond dielectric barrier discharges in open air has been clarified with time-dependent measurement of the discharge electric field by electric-field-induced coherent Raman scattering and optical emission. Our experimental observations have revealed that, in the prebreakdown phase of a nanosecond dielectric barrier discharge, the externally applied fast-rising electric field is strongly enhanced near the cathode due to large accumulation of space charge, which then strongly enhances ionization near the cathode. Once a sufficiently large number of ionizations take place, the location of peak ionization forms a front and propagates toward the cathode with strong optical emission, which establishes the discharge. This process is essentially different from the well-known Townsend mechanism for slower discharges. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|