Townsend Instabilities in a Modified Discharge System With Coupled Narrow Gaps

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

IEEE TRANSACTIONS ON PLASMA SCIENCE, cilt.39, sa.4, ss.1086-1091, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 4
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1109/tps.2011.2112782
  • Dergi Adı: IEEE TRANSACTIONS ON PLASMA SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1086-1091
  • Gazi Üniversitesi Adresli: Evet

Özet

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.