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Langmuir probe in collisionless and collisional plasma including dusty plasma

Published online by Cambridge University Press:  26 April 2017

Sayak Bose ,
Manjit Kaur ,
P. K. Chattopadhyay ,
J. Ghosh ,
Y. C. Saxena  and
R. Pal
Sayak Bose*
Affiliation:
Institute for Plasma Research, HBNI, Bhat, Gandhinagar, Gujarat, 382428, India
Manjit Kaur
Affiliation:
Institute for Plasma Research, HBNI, Bhat, Gandhinagar, Gujarat, 382428, India Department of Physics and Astronomy, Swarthmore College, 500 College Ave., Swarthmore,  PA 19081, USA
P. K. Chattopadhyay
Affiliation:
Institute for Plasma Research, HBNI, Bhat, Gandhinagar, Gujarat, 382428, India
J. Ghosh
Affiliation:
Institute for Plasma Research, HBNI, Bhat, Gandhinagar, Gujarat, 382428, India
Y. C. Saxena
Affiliation:
Institute for Plasma Research, HBNI, Bhat, Gandhinagar, Gujarat, 382428, India
R. Pal
Affiliation:
Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
*
†Email address for correspondence: sayakbose02@gmail.com
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Abstract

Measurements of local plasma parameters in dusty plasma are crucial for understanding the physics issues related to such systems. The Langmuir probe, a small electrode immersed in the plasma, provides such measurements. However, designing of a Langmuir probe system in a dusty plasma environment demands special consideration. First, the probe has to be miniaturized enough so that its perturbation on the ambient dust structure is minimal. At the same time, the probe dimensions must be such that a well-defined theory exists for interpretation of its characteristics. The associated instrumentation must also support the measurement of current collected by the probe with high signal to noise ratio. The most important consideration, of course, comes from the fact that the probes are prone to dust contamination, as the dust particles tend to stick to the probe surface and alter the current collecting area in unpredictable ways. This article describes the design and operation of a Langmuir probe system that resolves these challenging issues in dusty plasma. In doing so, first, different theories that are used to interpret the probe characteristics in collisionless as well as in collisional regimes are discussed, with special emphasis on application. The critical issues associated with the current–voltage characteristics of Langmuir probe obtained in different operating regimes are discussed. Then, an algorithm for processing these characteristics efficiently in presence of ion-neutral collisions in the probe sheath is presented.

Keywords

complex plasmasdusty plasmasplasma diagnostics
Type
Research Article
Information
Journal of Plasma Physics , Volume 83 , Issue 2 , April 2017 , 615830201
Copyright
© Cambridge University Press 2017 

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