Emissive probe as a reference electrode in probe measurements

1993 ◽  
Vol 64 (11) ◽  
pp. 3274-3277 ◽  
Author(s):  
T. Kimura ◽  
K. Ohe
Keyword(s):  
Reference Electrode ◽  
Probe Measurements ◽  
Emissive Probe

Effect of filament supports on emissive probe measurements

2013 ◽  
Vol 84 (1) ◽  
pp. 013506 ◽  
Author(s):  
X. Wang ◽  
C. T. Howes ◽  
M. Horányi ◽  
S. Robertson
Keyword(s):  
Probe Measurements ◽  
Emissive Probe

Emissive probe measurements of plasma potential fluctuations in the edge plasma regions of tokamaks

2003 ◽  
Vol 74 (3) ◽  
pp. 1583-1587 ◽  
Author(s):  
P. Balan ◽  
R. Schrittwieser ◽  
C. Ioniţă ◽  
J. A. Cabral ◽  
H. F. C. Figueiredo ◽  
...  
Keyword(s):  
Plasma Potential ◽  
Edge Plasma ◽  
Potential Fluctuations ◽  
Probe Measurements ◽  
Emissive Probe

Die Hochfrequenz-Resonanz-Sonde

1967 ◽  
Vol 22 (6) ◽  
pp. 872-890
Author(s):  
Günter Peter
Keyword(s):  
Reference Electrode ◽  
Intersection Point ◽  
Probe Voltage ◽  
Ac Current ◽  
Resonance Maximum ◽  
Cesium Plasma ◽  
Langmuir Probe Measurements ◽  
Ac Transmission ◽  
First Time ◽  
Probe Measurements

Dc and ac currents to a rf resonance probe were investigated experimentally in the frequency range from 1 to 100 Mc/s in a quiescent Cesium plasma. The measurements in the plasma are explained by calculations and measurements with a lumped-constant equivalent network (“plasma simulator”).It is shown that the ac current to the probe is strongly influenced by the capacitance of the cable leading to the probe. A device to compensate this cable-capacitance is developed and used. Furthermore, it is shown for the first time that the double (or devided) main resonance maximum, occurring frequently with dc and ac currents to the resonance probe, is generally due to the influence of a second reference electrode.A simple and direct (“focus”) method for very precise plasma density determination (from the intersection point of the rf-current-vs.-frequency curves with probe voltage as parameter) is developed and compared with ac transmission current and LANGMUIR probe measurements at plasma densities between 2 × 106 and 3 × 107 cm–3. Agreement is obtained between these three experimental methods within their margins of error. The comparison leads to a better understanding of the measured LANGMUIR characteristic and of the Cs-plasma of the “Alma I” device.

scholarly journals Mathematical modeling of probe measurements in a supersonic flow of a four-component collisionless plasma

2020 ◽  
Vol 2020 (4) ◽  
pp. 97-109
Author(s):  
D.N. Lazuchenkov ◽  
◽  
N.M. Lazuchenkov ◽  
Keyword(s):  
Electrode Surface ◽  
Collisionless Plasma ◽  
Reference Electrode ◽  
Area Ratio ◽  
Ion Composition ◽  
Surface Area Ratio ◽  
Probe Current ◽  
Surface Areas ◽  
Probe System ◽  
Probe Measurements

The aim of this work is the development of a procedure for extracting the plasma electron density and temperature and ion composition from the current-voltage characteristic (C –V characteristic) of an isolated probe system of cylindrical electrodes. The plasma is four-component and consists of electrons, ions of two species with significantly different masses, and neutrals. The measuring probe and the reference electrode of the probe system may be made up of several cylinders. The electrodes of the probe system are placed transversely to a supersonic flow of a low-temperature collisionless plasma with a specified mass velocity. Using the familiar theoretical and experimental relationships for the ion and electron currents to a cylinder, a mathematical model of current collection is constructed for an isolated probe system at an arbitrary ratio of the electrode surface areas. The model includes the calculation of the equilibrium potential of the reference electrode as a function of the probe bias voltage. A procedure is developed for the identification of local plasma parameters using a priori information on the plasma properties and the experimental conditions. The effect of the electron density and temperature and the ion composition on the probe current of the isolated probe system at different ratios of the current-collecting electrode surface areas is studied. The ranges of the probe bias potentials and the values of the electrode surface area ratio that maximize and minimize the effect of the sought-for parameters on the probe current are determined. The quantitative restrictions on the bias potentials and the surface area ratio obtained in this study are used in the probe measurement procedure and in the objective function for comparing the theoretical approximation of the probe current with the measured I– characteristics. A numerical simulation of probe measurements under the ionospheric conditions was conducted to verify the efficiency of the procedure for extracting the local parameters of a four-component plasma from the electron branch of the I –V characteristic of an isolated probe system. The results obtained may be used in ionospheric plasma diagnostics onboard nanosatellites.

How plasma parameters fluctuations influence emissive probe measurements

2015 ◽  
Vol 22 (5) ◽  
pp. 053511 ◽  
Author(s):  
G. Bousselin ◽  
N. Plihon ◽  
N. Lemoine ◽  
J. Cavalier ◽  
S. Heuraux
Keyword(s):  
Plasma Parameters ◽  
Probe Measurements ◽  
Emissive Probe

Experimental study of the creation of a fire-rod II: Emissive probe measurements

2003 ◽  
Vol 43 (1) ◽  
pp. 11-24 ◽  
Author(s):  
T. Gyergyek ◽  
M. Čerček ◽  
R. Schrittwieser ◽  
C. Ionita ◽  
G. Popa ◽  
...  
Keyword(s):  
Experimental Study ◽  
The Creation ◽  
Probe Measurements ◽  
Emissive Probe
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