Results 251 to 260 of about 97,950 (298)

High-speed dual Langmuir probe

Review of Scientific Instruments, 2010
In an effort to temporally resolve the electron density, electron temperature, and plasma potential for turbulent plasma discharges, a unique high-speed dual Langmuir probe (HDLP) has been developed. A traditional single Langmuir probe of cylindrical geometry (exposed to the plasma) is swept simultaneously with a nearby capacitance and noise ...
Robert B, Lobbia, Alec D, Gallimore
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Self-cleaning Langmuir probe

Review of Scientific Instruments, 1993
A contamination-free Langmuir probe of novel design is described. Surface contaminants, which lead to erroneous evaluation of plasma parameters by distortion of the probe’s current-voltage characteristic, are removed by the indirect heating of the probe tip with separate heating elements running parallel to the probe wire in multibore alumina tubing ...
W. E. Amatucci, M. E. Koepke, T. E. Sheridan, M. J. Alport, J. J. Carroll   +4 more
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Radio frequency-compensated Langmuir probe with auxiliary double probes

Review of Scientific Instruments, 2010
A radio frequency (rf) compensation design using auxiliary double probes connected in parallel with a main measurement probe was developed for Langmuir probe diagnostics. This probe structure can reduce the sheath impedance of the main probe. In our probe design, the sheath capacitance of the probe can be increased and its sheath resistance can be ...
Se-Jin, Oh, Seung-Ju, Oh, Chin-Wook, Chung   +2 more
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Langmuir probe diagnosis of turbulent plasmas.

AIAA Journal, 1965
This paper analyzes the response of Langmuir probes to periodic or random fluctuations in plasmas with the specific aim of developing methods for measuring statistical properties of unsteady or turbulent electron-rich gases. Beginning with the classical theory of Langmuir and Mott-Smith for the probe steady-state characteristics, the waveform ...
A. DEMETRIADES, E. DOUGHMAN
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Comparison between RF probe and langmuir probe measurements

Physics Letters A, 1967
Abstract A new r.f. probe method for determining electron density is described and compared with Langmuir probe measurements.
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Modulated Langmuir Probe Characteristics

Journal of Applied Physics, 1963
The presence of fluctuations in the discharge parameters introduces errors into Langmuir probe measurements. Previous work by Garscadden and Emeleus considered the effects of fluctuations in the individual parameters. In this paper a generalized small-amplitude theory of the effects of these fluctuations is given and also a large signal theory for ...
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High Impedance Langmuir Probes

Review of Scientific Instruments, 1968
The operating characteristics and limitations of high impedance resistive probes are discussed. A new high impedance probe employing capacitive coupling to detect plasma floating potential is described. The advantages of capacitive coupling for increasing the input impedance, reducing the size, and broadening the bandwidth are illustrated.
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New Applications of Langmuir Probes

Physics of Atomic Nuclei, 2017
In this work, two new possibilities for standard probe diagnostics are described. The first one can be used to study isotropic, collisionless low-pressure plasma in which the electron energy distribution function is close to a Maxwellian one. In such plasmas, the Boltzmann law, Bohm effect, and 3/2 power law are valid.
P. E. Masherov, A. F. Piskunkov, V. A. Riaby, V. P. Savinov, V. G. Yakunin   +4 more
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HIGH ALTITUDE GUN PROBES (DEVELOPMENT OF LANGMUIR PROBES)

1965
Abstract : This final report describes a program to develop an instrument capable of measuring electron density in the 50 to 160 kilometer altitude region and capable of surviving a 60,000 'G' shock encountered during launch from a cannon. This report is in two parts: The first describes various techniques and instruments capable of measuring electron ...
L. C. Smith, A. L. Kadis, A. V. Block
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Automatic Langmuir probe plasma diagnostic

Review of Scientific Instruments, 1987
The hardware implementation of a computer-based Langmuir probe technique is described. The technique, which is applicable in a wide range of dc plasma conditions, allows a full range of plasma parameters to be measured efficiently.
Hopkins, M.B., Graham, Bill, Griffin, T.J.   +2 more
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