Townsend Instabilities in a Modified Discharge System With Coupled Narrow Gaps

Kurt H. H. , Cetin S., Salamov B. G.

IEEE TRANSACTIONS ON PLASMA SCIENCE, vol.39, no.4, pp.1086-1091, 2011 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 39 Issue: 4
  • Publication Date: 2011
  • Doi Number: 10.1109/tps.2011.2112782
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1086-1091


Townsend-type discharge in a modified gas discharge cell with coupled narrow gaps between a high-resistivity semiconductor plate and two planar electrodes is experimentally studied in the range of gas pressure 28-352 torr for various interelectrode distances (d(1) = 50 mu m, d(2) = 50 - 320 mu m). The effect of various diameters on the photodetector area to the discharge (D = 9 - 12 - 15 mm) are considered as well. It is observed that Townsend discharge is unstable at low current densities for certain experimental parameters. The temporal dynamics of the current fluctuations is measured around I = 50 mu A. Interactions of plasmas with surfaces and space charge effects in many cases are the main reason for the nonlinear effects in gas discharges with increasing current.