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Space charge configuration formed in weakly magnetized diffusion plasma

M. MIHAI – PLUGARU1, L. M. IVAN1, D. G. DIMITRIU1,*

Affiliation

  1. Faculty of Physics, Dept. of Plasma Physics, “Al. I. Cuza” University of Iasi, Blvd. Carol I, No. 11, 700506-Iasi, Romania

Abstract

On a positively biased electrode immersed in weekly magnetized plasma a complex space charge configuration is formed, known as fire-rod. This fire-rod consists of a positive nucleus (ion enriched plasma) bordered by an electric double layer (DL). We investigated this structure with one side emissive probe using argon as working gas. The measurements were made in pulsed regime and the probe characteristics were recorded at different times after the application of the step voltage and at different distances from the plasma source. After a few microseconds we observed a change in the characteristic shape comparative with those obtained in continuous regime. From probe characteristics we extract the electron energy distribution function (EEDF). Inside the fire-rod two groups of electrons with different temperatures and energies were observed. The plasma parameters were studied in different experimental conditions (gas pressure, plasma density, potential of the electrode, etc.), at different distance from electrode, inside and outside of the fire-rod. The obtained results give a broad picture about the elementary processes at the origin of the appearance and dynamics of a CSCC in magnetised plasma..

Keywords

Double layer, Bistability, Self-organization.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

M. MIHAI – PLUGARU, L. M. IVAN, D. G. DIMITRIU, Space charge configuration formed in weakly magnetized diffusion plasma, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 156-159 (2006)