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The Scientific World Journal - Volume 2014 2014, Article ID 279868, 8 pages -

Research Article

Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia

Department of Physics, University of Agriculture, Faisalabad 38040, Pakistan

Department of Electrical Engineering, King Saud University, Riyadh 11451, Saudi Arabia

Department of Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan

Received 22 August 2013; Accepted 4 December 2013; Published 5 February 2014

Academic Editors: L. Jing and N. Lisitza

Copyright © 2014 M. Y. Naz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Multitip probes are very useful diagnostics for analyzing and controlling the physical phenomena occurring in low temperature discharge plasmas. However, DC biased probes often fail to perform well in processing plasmas. The objective of the work was to deduce simple designs of DC biased multitip probes for parametric study of radio frequency plasmas. For this purpose, symmetric double probe, asymmetric double probe, and symmetric triple probe diagnostic systems and their driving circuits were designed and tested in an inductively coupled plasma ICP generated by a 13.56 MHz radio frequency RF source. Using characteristics of these probes, electron temperature, electron number density, and ion saturation current was measured as a function of input power and filling gas pressure. An increasing trend was noticed in electron temperature and electron number density for increasing input RF power whilst a decreasing trend was evident in these parameters when measured against filling gas pressure. In addition, the electron energy probability function EEPF was also studied by using an asymmetric double probe. These studies confirmed the non-Maxwellian nature of the EEPF and the presence of two groups of the energetic electrons at low filling gas pressures.





Autor: M. Y. Naz, S. Shukrullah, A. Ghaffar, and N. U. Rehman

Fuente: https://www.hindawi.com/



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