Results 261 to 270 of about 97,950 (298)

Validating cylindrical Langmuir probe techniques

Review of Scientific Instruments, 1992
Several methods for estimating the plasma potential and density using cylindrical Langmuir probes are compared to the self-consistent solutions of the Vlasov–Poisson equations calculated by Laframboise (J. G. Laframboise, Ph. D. dissertation, University of Toronto, 1966).
J. H. Rogers, J. S. De Groot, D. Q. Hwang   +2 more
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Langmuir-probe measurements in flowing-afterglow plasmas

Physical Review E, 1994
The validity of the orbital-motion theory for cylindrical Langmuir probes immersed in flowing-afterglow plasmas is investigated experimentally. It is found that the probe currents scale linearly with probe area only for electron-collecting but not for ion-collecting probes.
, Johnsen, , Shun'ko, , Gougousi, , Golde   +3 more
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EXPERIMENTAL INVESTIGATION OF LANGMUIR PROBES

Canadian Journal of Physics, 1967
Electron temperatures and densities measured in a weakly ionized helium afterglow with cylindrical double probes are compared with measurements obtained using a gated microwave radiometer and a microwave resonant cavity. The pressure was varied from 0.1 to 8.5 Torr. At low pressure, magnetic fields up to 0.11 T were applied.
R. M. Clements, H. M. Skarsgard
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Ion‐Neutral Collision Effects in Langmuir Probe Theory

Contributions to Plasma Physics, 2008
AbstractIn weakly collisional sheaths, potential wells and barriers could appear. These can cause the presence of repulsed and trapped ions in the region surrounding a negatively biased Langmuir probe, invalidating the orbital motion limited (OML) theory. In this work, a Particle‐In‐Cell/Test‐Particle Monte Carlo (PIC/TPMC) model of Ar plasma at medium
F Taccogna, S Longo, M Capitelli
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Langmuir probes and ion flow

Journal of Physics D: Applied Physics, 1970
Plane probes have been used to measure plasma density in the positive column of a low pressure mercury discharge. The results have been found to depend on the orientation of the probe face and it is suggested that this is due to the effects of radial ion flow. It is shown that accurate values for plasma density distribution can be obtained by placing a
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Langmuir probes for plasma plume diagnostics

2014 IEEE 41st International Conference on Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS), 2014
Langmuir probes are highly versatile plasma diagnostic tools. Triple Langmuir probes (TLP) can be used to measure electron the temperature (T e ) and density (n e ) with time resolution. This ability gives a unique opportunity to observe the time evolution of discontinuities formed at the interaction of a plasma flow with a static background plasma ...
A. Arias, N. Quiros, R. Presura
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Langmuir probe response to periodic waveforms

Journal of Geophysical Research, 1964
Langmuir probe response to periodic waveform and application to study of laboratory plasmas or charged particles in ...
F. W. Crawford, R. F. Mlodnosky
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Double Langmuir Probes for Hypervelocity Wakes

IEEE Transactions on Aerospace and Electronic Systems, 1967
Double Langmuir probes have been used to measure the ionization intensity in the wake of a hypervelocity projectile; subsidiary experiments to check the validity of the results are described. The spectral characteristic of the fluctuating part of the probe signal has been examined. Because of theoretical and experimental difficulties the results can at
A. Tate, Peter W. W. Fuller, C. R. Wall
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Contamination-free sounding rocket Langmuir probe

Review of Scientific Instruments, 2001
A technique for removing surface contaminants from a sounding rocket spherical Langmuir probe is presented. Contamination layers present on probe surfaces can skew the collected data, resulting in the incorrect determination of plasma parameters. Despite following the usual probe cleaning techniques that are used prior to a launch, the probe surface ...
W. E. Amatucci, P. W. Schuck, D. N. Walker, P. M. Kintner, S. Powell, B. Holback, D. Leonhardt   +6 more
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Heat analogy in langmuir probe theory

Journal of Engineering Physics and Thermophysics, 1996
Mathematical equivalence of the problems of determining the Langmuir, probe saturation current and the Nusselt number is shown in the heat transfer of a body of the same shape. Numerical results of the solution to these two problems obtained in various works are compared for a cylinder.
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