scholarly journals Determination of Plasma Electron Temperature from the Reversal of Radial Ambipolar Electric Field in a Longitudinal Magnetic Field

1972 ◽  
Vol 27 (10) ◽  
pp. 1439-1443 ◽  
Author(s):  
Günter Franck ◽  
R. Held ◽  
H. D. Pfeil
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Longitudinal Magnetic Field ◽  
Plasma Electron ◽  
Langmuir Probes ◽  
Field Reversal ◽  
Field Diffusion ◽  
The One ◽  
Good Agreement

Abstract When a longitudinal magnetic field is superimposed to a low pressure plasma, reversal of the radial ambipolar electric field takes place at a definite magnetic field Br. From the Br-values electron temperatures Te in the plasma can be found, when classical magnetic field diffusion exists. In the negative H2-and He-glow plasmas with superimposed longitudinal magnetic field, electron temperatures have been measured on the one hand by the method of electric field reversal and on the other hand with Langmuir probes. There is a fairly good agreement between the Te-values obtained by both methods.

scholarly journals Modeling Electric Field and Potential Distribution of an Model of Insulator in Two Dimensions by the Finite Element Method

2018 ◽  
Vol 3 (1) ◽  
pp. 01
Author(s):  
Nassima M ziou ◽  
Hani Benguesmia ◽  
Hilal Rahali
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Potential Distribution ◽  
Two Dimensions ◽  
Comsol Multiphysics ◽  
The Finite Element Method ◽  
Good Agreement ◽  
Element Method

The electrical effects can be written by two magnitudes the field and the electrostatic potential, for the determination of the distribution of the field and the electric potential along the leakage distance of the polluted insulator, the comsol multiphysics software based on the finite element method will be used. The objective of this paper is the modeling electric field and potential distribution in Two Dimensions by the Finite Element Method on a model of insulator simulating the 1512L outdoor insulator used by the Algerian company of electricity and gas (SONELGAZ). This model is under different conductivity, applied voltage, position of clean layer and width of clean layer. The computer simulations are carried out by using the COMSOL multiphysics software. This paper describes how Comsol Multiphysics have been used for modeling of the insulator using electrostatic 2D simulations in the AC/DC module. Numerical results showed a good agreement.

scholarly journals On Deuling's Transition in a Nematic Liquid Crystal

1984 ◽  
Vol 39 (6) ◽  
pp. 571-574
Author(s):  
G. Barbero ◽  
A. Strigazzi
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Electric Field ◽  
Explicit Expression ◽  
Nematic Liquid Crystal ◽  
Applied Magnetic Field ◽  
The One ◽  
Strong Anchoring

We analyse Deuling's problem both in the one constant approximation and in the general case. An explicit expression is found for the electric field threshold vs. the crossed applied magnetic field, in the strong anchoring hypothesis.

The diamagnetism of a plasma column

1968 ◽  
Vol 305 (1481) ◽  
pp. 251-257 ◽  
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Electron Number Density ◽  
Experimental Measurements ◽  
Number Density ◽  
Electron Number ◽  
Fluid Approximation ◽  
Ion Motion ◽  
The Magnetic Field ◽  
Good Agreement

It has long been known that the positive column of a gas discharge is diamagnetic as a result of the motions of the electrons in a longitudinal magnetic field, but there has been considerable discrepancy between theory and experimental measurements made on low pressure discharges. Calculations are reported here based on a theory in which the ion motion is treated in a fluid approximation for parameters relevant to new experimental measurements. This theory automatically takes into account the effect of the magnetic field on electron temperature and electron number density distribution. It is shown that with this model and sufficient knowledge of the discharge conditions, good agreement can be obtained between theory and experiment for magnetic fields typically less than 300 G.

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