Ion kinetics and self pulsing in DC microplasma discharges at atmospheric and higher pressure. (3rd March 2016)

• Record Type: Journal Article
• Authors: Mahamud, Rajib; Farouk, Tanvir I
• Is Part Of: Journal of physics. Volume 49:Number 14(2016)
• Publication Date: 2016-03-03
• Subjects: microplasma -- high pressure -- pulsing -- relaxation oscillation -- negative differential resistance; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/14/145202
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Atmospheric pressure microplasma devices have been the subject of considerable interest and research during the last decade. Most of the operation regime of the plasma discharges studied fall in the ' abnormal', 'normal' and 'corona' modes—increasing and a ' flat' voltage current characteristics. However, the negative differential resistance regime at atmospheric and high pressures has been less studied and possesses unique characteristics that can be employed for novel applications. In this work, the role of ion kinetics especially associated with trace impurities; on the self pulsing behavior has been investigated. Detailed numerical simulations have been conducted with a validated model for a helium-nitrogen feed gas mixture. Different oscillatory modes were observed where the discharge was found to undergo complete or partial relaxation. Trace amount of nitrogen was found to significantly alter the pulsing characteristics. External parameters influencing these self oscillations are also studied and aspects of the ion kinetics on the oscillatory behavior are discussed.