中国物理B ›› 2018, Vol. 27 ›› Issue (5): 55202-055202.doi: 10.1088/1674-1056/27/5/055202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Characteristic plume morphologies of atmospheric Ar and He plasma jets excited by a pulsed microwave hairpin resonator

Zhao-Quan Chen(陈兆权), Ben-Kuan Zhou(周本宽), Huang Zhang(张煌), Ling-Li Hong(洪伶俐), Chang-Lin Zou(邹长林), Ping Li(李平), Wei-Dong Zhao(赵卫东), Xiao-Dong Liu(刘晓东), Olga Stepanova, A A Kudryavtsev   

  1. 1 School of Electrical & Information Engineering, Anhui University of Technology, Maanshan 243032, China;
    2 Faculty of Physics, St. Petersburg State University, St. Petersburg 198504, Russia
  • 收稿日期:2018-01-17 修回日期:2018-02-12 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Zhao-Quan Chen E-mail:qq66168@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11575003 and 51607003).

Characteristic plume morphologies of atmospheric Ar and He plasma jets excited by a pulsed microwave hairpin resonator

Zhao-Quan Chen(陈兆权)1, Ben-Kuan Zhou(周本宽)1, Huang Zhang(张煌)1, Ling-Li Hong(洪伶俐)1, Chang-Lin Zou(邹长林)1, Ping Li(李平)1, Wei-Dong Zhao(赵卫东)1, Xiao-Dong Liu(刘晓东)1, Olga Stepanova2, A A Kudryavtsev2   

  1. 1 School of Electrical & Information Engineering, Anhui University of Technology, Maanshan 243032, China;
    2 Faculty of Physics, St. Petersburg State University, St. Petersburg 198504, Russia
  • Received:2018-01-17 Revised:2018-02-12 Online:2018-05-05 Published:2018-05-05
  • Contact: Zhao-Quan Chen E-mail:qq66168@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11575003 and 51607003).

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摘要： Different discharge morphologies in atmospheric Ar and He plasmas are excited by using a pulsed microwave hairpin resonator. Ar plasmas form an arched plasma plume at the opened end of the hairpin, whereas He plumes generate only a contracted plasmas in between both tips of metal electrodes. Despite this different point, their discharge processes have three similar characteristics:(i) the ionization occurs at the main electrode firstly and then develops to the slave electrode, (ii) during the shrinking stage the middle domain of the discharge channels disappears at last, and (iii) even at zero power input (in between pulses) a weak light region always exists in the discharge channels. Both experimental results and electromagnetic simulations suggest that the discharge is resonantly excited by the local enhanced electric fields. In addition, Ar ionization and excitation energies are lower than those of He, the effect of Ar gas flow is far greater than that of He gas, and the contribution of accelerated electrons only locates at the domain with the strongest electric fields. These reasons could be used to interpret the different characteristic plume morphologies of the proposed atmospheric Ar and He plasmas.

关键词: atmospheric pressure plasma jet, pulsed microwave discharge, surface plasmon polaritons, hairpin resonant discharge

Abstract: Different discharge morphologies in atmospheric Ar and He plasmas are excited by using a pulsed microwave hairpin resonator. Ar plasmas form an arched plasma plume at the opened end of the hairpin, whereas He plumes generate only a contracted plasmas in between both tips of metal electrodes. Despite this different point, their discharge processes have three similar characteristics:(i) the ionization occurs at the main electrode firstly and then develops to the slave electrode, (ii) during the shrinking stage the middle domain of the discharge channels disappears at last, and (iii) even at zero power input (in between pulses) a weak light region always exists in the discharge channels. Both experimental results and electromagnetic simulations suggest that the discharge is resonantly excited by the local enhanced electric fields. In addition, Ar ionization and excitation energies are lower than those of He, the effect of Ar gas flow is far greater than that of He gas, and the contribution of accelerated electrons only locates at the domain with the strongest electric fields. These reasons could be used to interpret the different characteristic plume morphologies of the proposed atmospheric Ar and He plasmas.

Key words: atmospheric pressure plasma jet, pulsed microwave discharge, surface plasmon polaritons, hairpin resonant discharge

中图分类号:  (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))

  • 52.35.Mw
52.50.Sw (Plasma heating by microwaves; ECR, LH, collisional heating) 52.40.Fd (Plasma interactions with antennas; plasma-filled waveguides)