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Space and time resolved Langmuir probe measurements in a 100 kHz pulsed rectangular magnetron system

Bradley, JW, Bäcker, H, Kelly, PJ and Arnell, RD 2001, 'Space and time resolved Langmuir probe measurements in a 100 kHz pulsed rectangular magnetron system' , Surface and Coatings Technology, 142-144 , pp. 337-341.

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Abstract

Using a cylindrical Langmuir probe, the temporal evolution of the electron density ne, electron temperature Te and plasma potential Vp has been measured at positions along the centre line in a 100-kHz pulsed magnetron plasma. The duty cycle was fixed at 50% and the Ar gas pressure was 0.27 Pa. At the beginning of the ‘on’ phase, a population of hot electrons was observed (for approx. 1 μs), with Te and ne approximately 50% higher than their time-averaged values. During the remainder of the ‘on’ phase, the electrons heat and then cool, following the rise and dip in the target potential. At the beginning of the ‘off’ phase, ne is seen to fall rapidly by over 60% at all positions and Te rises, however, both parameters recover after 1 μs and then slowly decay with a time constant of not, vert, similar40 μs. During the transition from ‘on’ to ‘off’ phases, Vp, rises rapidly from its usual value, a few volts above ground potential, to a few volts above the cathode potential (e.g. Vpnot, vert, similar+25 V). Some simple explanations for the observations are given.

Item Type: Article
Uncontrolled Keywords: Langmuir probe; Pulsed magnetron plasma; Electron density, Electron temperature; Plasma potential
Themes: Subjects / Themes > Q Science > QD Chemistry
Subjects / Themes > Q Science > QC Physics
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Journal or Publication Title: Surface and Coatings Technology
Publisher: Elsevier
Refereed: Yes
ISSN: 02578972
Depositing User: H Kenna
Date Deposited: 23 Aug 2007 12:19
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/339

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