Journal ArticleDOI
Langmuir probe in collisionless and collisional plasma including dusty plasma
TLDR
In this article, the design and operation of a Langmuir probe system that resolves the challenging issues in dusty plasma is described, and different theories that are used to interpret the probe characteristics in collisionless as well as in collisional regimes are discussed.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.read more
Citations
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Journal ArticleDOI
A new multi line-cusp magnetic field plasma device (MPD) with variable magnetic field for fundamental plasma studies
TL;DR: The plasma produced will be used to study new and hitherto unexplored physics parameter space relevant to both laboratory multi-scale plasmas and astrophysical plas Mas, as well as accurate control on the gradient length scales of mean density and temperature profiles.
Journal ArticleDOI
Role of ion magnetization in formation of radial density profile in magnetically expanding plasma produced by helicon antenna
TL;DR: In this paper, the density profile in the magnetic nozzle of a helicon antenna based plasma device is seen to be modified from being centrally peaked to that of hollow nature as the external magnetic field is increased.
Journal ArticleDOI
A new multi-line cusp magnetic field plasma device (MPD) with variable magnetic field.
TL;DR: In this paper, a multi-line cusp magnetic field plasma device consisting of electromagnets with core material has been constructed with a capability to experimentally control the relative volume fractions of magnetized to unmagnetized plasma volume as well as accurate control on the gradient length scales of mean density and temperature profiles.
Journal ArticleDOI
Modified high frequency probe approach for diagnostics of highly reactive plasma
Petr Sezemsky,Vitezslav Stranak,Jiri Kratochvil,Martin Cada,Rainer Hippler,Miroslav Hrabovsky,Zdenek Hubicka +6 more
TL;DR: In this paper, a radiofrequency (rf) Sobolewski probe is used for ion flux measurement, which is further modified to obtain the electron temperature in some cases and the ion density.
Journal ArticleDOI
Study on helium atmospheric pressure plasma jet using collisional-radiative model
TL;DR: In this article, the helium (He) nonthermal atmospheric pressure plasma jet (APPJ) source was configured, and the He spectra were measured by applying AC power to the source.
References
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Journal ArticleDOI
Smoothing and Differentiation of Data by Simplified Least Squares Procedures.
Book
Introduction to Dusty Plasma Physics
TL;DR: The book Introduction to Plasma Physics by Shukla and Mamun as discussed by the authors deals with various aspects of collective processes in dusty plasmas and provides a handbook on waves and instabilities in the coming years.
Journal ArticleDOI
The Theory of Collectors in Gaseous Discharges
H. M. Mott-Smith,Irving Langmuir +1 more
TL;DR: In this article, a cylindrical or spherical electrode (collector) immersed in an ionized gas is brought to a suitable potential, it becomes surrounded by a symmetrical space charge region or "sheath" of positive or of negative ions (or electrons).
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