Probe measurements of the boundary plasma parameters in the TM-1-MH tokamak

1983 ◽  
Vol 33 (6) ◽  
pp. 663-668 ◽  
Author(s):  
K. Jakubka ◽  
J. Stöckel ◽  
F. Žáček ◽  
S. Nanobashvili
Keyword(s):  
Plasma Parameters ◽  
Boundary Plasma ◽  
Probe Measurements

scholarly journals COMPARISON BETWEEN 2D TURBULENCE MODEL ESEL AND EXPERIMENTAL DATA FROM AUG AND COMPASS TOKAMAKS

2015 ◽  
Vol 55 (2) ◽  
pp. 128-135 ◽  
Author(s):  
Peter Ondac ◽  
Jan Horacek ◽  
Jakub Seidl ◽  
Petr Vondrácek ◽  
Hans Werner Müller ◽  
...  
Keyword(s):  
Turbulent Transport ◽  
Plasma Potential ◽  
Density Fluctuations ◽  
Tokamak Plasma ◽  
Plasma Parameters ◽  
Fluid Turbulence ◽  
Radial Profiles ◽  
Parallel Dynamics ◽  
Two Machines ◽  
Probe Measurements

<!-- p, li { white-space: pre-wrap; } --><p style="text-indent: 0px; margin: 0px;">In this article we have used the 2D fluid turbulence numerical model, ESEL, to simulate turbulent transport in edge tokamak plasma. Basic plasma parameters from the ASDEX Upgrade and COMPASS tokamaks are used as input for the model, and the output is compared with experimental observations obtained by reciprocating probe measurements from the two machines. Agreements were found in radial profiles of mean plasma potential and temperature, and in a level of density fluctuations. Disagreements, however, were found in the level of plasma potential and temperature fluctuations. This implicates a need for an extension of the ESEL model from 2D to 3D to fully resolve the parallel dynamics, and the coupling from the plasma to the sheath.</p>

scholarly journals In situ measurements of sub-meter plasma waves over low-latitude ionosphere during Leonid-99 meteor storm

2004 ◽  
Vol 22 (6) ◽  
pp. 2033-2036
Author(s):  
S. P. Gupta ◽  
R. Sekar ◽  
Y. B. Acharya
Keyword(s):  
High Frequency ◽  
Plasma Waves ◽  
Plasma Parameters ◽  
Low Latitude ◽  
Scale Size ◽  
Meteor Storm ◽  
Low Latitude Ionosphere ◽  
First Time ◽  
Probe Measurements

Abstract. In situ probe measurements of plasma parameters were carried out on 18 and 20 November 1999 from Sriharikota, India, a low-latitude rocket launching station to investigate the effect of a Leonid meteor storm. Results obtained on plasma waves using a high frequency Langmuir probe are discussed. The characteristics of the sub-meter scale size plasma waves observed for the first time during Leonid meteor storm are presented. Based on the results obtained from both the rocket flights and comparison with the results obtained from previous rocket flights from the same location, it appears these sub-meter waves are associated with intense meteoric activity. A possible mechanism based on the dependence of the meteoric activity and its limitations are discussed.

Probe measurements of plasma parameters in torch plasmatron

2014 ◽  
Vol 52 (2) ◽  
pp. 145-149
Author(s):  
V. P. Konovalov ◽  
A. S. Savelev ◽  
E. E. Son
Keyword(s):  
Plasma Parameters ◽  
Probe Measurements

A change in the characteristics of fluctuations of the boundary plasma parameters in the FT-2 tokamak upon transition to the improved plasma confinement regime

2000 ◽  
Vol 26 (10) ◽  
pp. 873-875
Author(s):  
E. O. Vekshina ◽  
P. R. Goncharov ◽  
S. V. Shatalin ◽  
V. N. Budnikov ◽  
L. A. Esipov ◽  
...  
Keyword(s):  
Plasma Confinement ◽  
Plasma Parameters ◽  
Boundary Plasma

Langmuir probe measurements of plasma parameters in the late stages of a laser ablated plume

1997 ◽  
Vol 81 (5) ◽  
pp. 2131-2134 ◽  
Author(s):  
J. M. Hendron ◽  
C. M. O. Mahony ◽  
T. Morrow ◽  
W. G. Graham
Keyword(s):  
Langmuir Probe ◽  
Plasma Parameters ◽  
Langmuir Probe Measurements ◽  
Late Stages ◽  
Probe Measurements

scholarly journals Estimation of probe measurements reliability in a supersonic flow of a four-component collisionless plasma

2021 ◽  
Vol 2021 (3) ◽  
pp. 57-69
Author(s):  
D.N. Lazuchenkov ◽  
◽  
N.M. Lazuchenkov ◽  
Keyword(s):  
Ionic Composition ◽  
Collisionless Plasma ◽  
Plasma Electron ◽  
Plasma Potential ◽  
Plasma Parameters ◽  
Probe Current ◽  
Bias Potential ◽  
Probe System ◽  
Parametric Studies ◽  
Probe Measurements

The aim of this work is to estimate the reliability of extracting the plasma electron density and temperature and ionic composition from the current-voltage (I-V) characteristic of an isolated probe system with cylindrical electrodes. An earlier proposed mathematical model of current collection by the probe system at positive bias potentials and an arbitrary ratio of the electrode areas is analyzed. The model is supplemented with a formula that determines, with an accuracy of several percent, the value of the bias potential at which the probe is under the plasma potential and the I-V characteristic splits into a transition and an electronic region. The analytical dependence of the bias potential on the plasma parameters and the ratio of the electrode areas made it possible to formalize the procedures for determining and assessing the reliability of the extracted plasma parameters using the regions of their strongest effect on the collected probe current. Parametric studies of the effect of the plasma parameters on the probe current were carried out for conditions close to measurements in the ionosphere. The paper demonstrates the feasibility of partitioning the sought-for plasma parameters into the regions of their strongest and weakest effect on the probe current in the range of the bias potentials considered. The problem of plasma parameter identification is formulated on the basis of a comparison of the probe current and the measured I-V characteristic in the L2 theoretical approximation. To each parameter there corresponds an objective function of its own, which differs in the domain of definition and the ratio of the electrode areas used in I-V characteristic measurements. Based on this formulation of the inverse problem in L2, estimates of the reliability of identification of the parameters of a plasma with two ion species are obtained depending on the errors of the model and probe measurements. The results obtained may be used in ionospheric plasma diagnostics.

scholarly journals Arc discharges operation in “elion” mode

2021 ◽  
Vol 2064 (1) ◽  
pp. 012029
Author(s):  
I V Lopatin ◽  
Yu H Akhmadeev ◽  
S S Kovalsky ◽  
D Yu Ignatov
Keyword(s):  
Arc Discharge ◽  
Plasma Generator ◽  
System Operation ◽  
Plasma Parameters ◽  
Ion Plasma ◽  
Gas Plasma ◽  
Arc Discharges ◽  
Burning Voltage ◽  
System Operating ◽  
Probe Measurements

Abstract This paper presents the results of a study of an electron-ion-plasma alitization system using two arc plasma generators: a gas plasma generator based on a non-self-sustained arc discharge with a thermionic cathode “PINK” and a gas-metal plasma generator based on an arc discharge with a cathode spot. The system for discharges supplying and biasing of the samples assumes two sub-modes of operation: the ion cleaning sub-mode (ion sub-mode) and the sub-mode of samples electron heating (electron sub-mode), thus realizing the “elion” mode of the system operation. During the experiments, both the dependences of the average values of currents and voltages of discharges burning and probe measurements of the instantaneous plasma parameters values in both system operating sub-modes were investigated. It is shown, that the electron sub-mode of system operation is characterized by an increased burning voltage, which is caused by the formation of a positive anode drop of more than 10 V in the plasmas. Such a potential distribution in the discharges ensures effective heating of the samples by the discharges plasmas electron component.

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