Optical emission diagnostics of the plasma channel in a pulsed electrical discharge in a gas bubble

S. Gershman, A. Belkind, K. Becker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Optical emission spectroscopy and fast, time-resolved imaging are used to assess the plasma parameters in the plasma channel of a pulsed power electrical discharge in gas bubbles. Gas bubbles are produced at the tip of a needle electrode submerged in water. The discharge in Ar, O2, and air bubbles is generated by applying 1μs long, 8 - 20 kV rectangular voltage pulses to the needle electrode. Spectroscopic methods based on line intensity ratio measurements and Boltzmann plots of line intensities of Ar, H, Ar +, and the examination of molecular emission bands from N2 molecules and OH radicals provide evidence of both fast, beam-like electrons and slow, thermalized electrons with temperatures of 0.6 - 0.8 eV. The spectroscopic study of rotational-vibrational bands of OH and N2 gives vibrational and rotational temperatures of about 0.9 eV and 0.1 eV, respectively. This investigation provides important experimental information about the characteristics of the plasma in the discharge channel. Accurate experimental information is important for practical applications of discharges in gas bubbles at atmospheric pressure as well as for the theoretical understanding and modeling that cannot proceed without a thorough experimental base.

Original languageEnglish (US)
Title of host publicationPPC2009 - 17th IEEE International Pulsed Power Conference
Pages838-840
Number of pages3
DOIs
StatePublished - 2009
Event17th IEEE International Pulsed Power Conference, PPC2009 - Washington, DC, United States
Duration: Jun 28 2009Jul 2 2009

Publication series

NamePPC2009 - 17th IEEE International Pulsed Power Conference

Other

Other17th IEEE International Pulsed Power Conference, PPC2009
CountryUnited States
CityWashington, DC
Period6/28/097/2/09

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Gershman, S., Belkind, A., & Becker, K. (2009). Optical emission diagnostics of the plasma channel in a pulsed electrical discharge in a gas bubble. In PPC2009 - 17th IEEE International Pulsed Power Conference (pp. 838-840). [5386370] (PPC2009 - 17th IEEE International Pulsed Power Conference). https://doi.org/10.1109/PPC.2009.5386370