Double-hole anode glow discharge in axial magnetic field at low pressures

2019 ◽  
Vol 26 (6) ◽  
pp. 063510
Author(s):  
Shen Gao
Keyword(s):  
Magnetic Field ◽  
Glow Discharge ◽  
Axial Magnetic Field ◽  
Low Pressures

scholarly journals DC Glow Discharge in Axial Magnetic Field at Low Pressures

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Shen Gao ◽  
Shixiu Chen ◽  
Zengchao Ji ◽  
Wei Tian ◽  
Jun Chen
Keyword(s):  
Magnetic Field ◽  
Glow Discharge ◽  
Differential Equations ◽  
Axial Magnetic Field ◽  
Glow Discharge Plasma ◽  
Dc Glow Discharge ◽  
Fluid Approximation ◽  
Low Pressures ◽  
Physical Quantities ◽  
The Magnetic Field

On the basis of fluid approximation, an improved version of the model for the description of dc glow discharge plasma in the axial magnetic field was successfully developed. The model has yielded a set of analytic formulas for the physical quantities concerned from the electron and ion fluids equations and Poisson equation. The calculated results satisfy the practical boundary conditions. Results obtained from the model reveal that although the differential equations under the condition of axial magnetic field are consistent with the differential equations without considering the magnetic field, the solution of the equations is not completely consistent. The results show that the stronger the magnetic field, the greater the plasma density.

DC radial glow discharge in axial magnetic field at low pressures

2019 ◽  
Vol 88 (3) ◽  
pp. 30801
Author(s):  
Shen Gao ◽  
Jianyuan Feng ◽  
Wenqi Li ◽  
Jihe Cai
Keyword(s):  
Magnetic Field ◽  
Glow Discharge ◽  
Plasma Density ◽  
High Intensity ◽  
Axial Magnetic Field ◽  
Spatial Density ◽  
Glow Plasma ◽  
Low Pressures ◽  
Moving Path ◽  
Intensity Magnetic Field

The influence of magnetic field on DC radial glow plasma was studied by self-designed coaxial glow discharge device, and the influence of magnetic field on the spatial distribution of plasma density is studied. The experimental results show that the spatial density distribution of plasma from cathode to anode increases gradually in the high-intensity magnetic field, and decreases gradually in the absence of magnetic field. Theoretical analysis of the above results show that the high-intensity magnetic field increases the moving path of the electrons, enhances the collision efficiency between the electrons and the neutral atoms, and makes the discharge plasma density remarkably enhanced.

scholarly journals Measurement of Some Argon Plasma Parameters Glow Discharge Under Axial Magnetic Field

2019 ◽  
Vol 7 (4) ◽  
pp. 158-166
Author(s):  
Pshtiwan M.A. Karim ◽  
Diyar S. Mayi ◽  
Shamo Kh. Al-Hakary
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Glow Discharge ◽  
Electron Temperature ◽  
Breakdown Voltage ◽  
Axial Magnetic Field ◽  
Argon Plasma ◽  
Emission Lines ◽  
Plasma Parameters ◽  
Gas Pressures

This paper investigates the characteristics some of argon plasma parameters of glow discharge under axial magnetic field. The DC power supply of range (0-6000) V is used as a breakdown voltage to obtain the discharge of argon gas. The discharge voltage-current (V-I) characteristic curves and Paschen’s curves as well as the electrical conductivity were studied with the presents of magnetic field confinement at different gas pressures. The magnetic field up to 25 mT was obtained using four coils of radius 6 cm and 320 turn by passing A.C current up to 5 Amperes. Spectroscopic measurements are employed for purpose of estimating two main plasma parameters electron temperature (Te) and electron density (ne). Emission spectra from positive column (PC) zone of the discharge have been studies at different values of magnetic field and pressures at constant discharge currents of 1.5 mA. Electron temperature (Te) and its density are calculated from the ratio of the intensity of two emission lines of the same lower energy levels. Experimental results show the abnormal glow region characteristics (positive resistance). Breakdown voltage versus pressure curves near the curves of paschen and decrease as magnetic field increases due to magnetic field confinement of plasma charged particles. Also the electrical conductivity increases due to enhancing magnetic field at different gas pressures. Both temperature density of electron and the intensities of two selected emission lines decrease with increasing pressure due decreasing of mean free path of electron. Electron density increase according to enhancing magnetic field, while the intensity of emitting lines tends to decrease.

Some Aspects of the Glow Discharge Between Coaxial Cylinders in the Presence of a Non-Homogeneous Axial Magnetic Field

1948 ◽  
Vol 1 (4) ◽  
pp. 400
Author(s):  
JM Somerville ◽  
KSW Champion ◽  
EK Bigg
Keyword(s):  
Magnetic Field ◽  
Glow Discharge ◽  
Axial Magnetic Field ◽  
Outer Cylinder ◽  
Negative Resistance ◽  
Coaxial Cylinders ◽  
Maximum Magnetic Field

The characteristics of the glow discharge in air between coaxial cylindrical electrodes in the presence of a non-homogeneous axial magnetic field are described. With the outer cylinder as cathode the discharge is narrow and takes place near the position of maximum magnetic field. If the cathode is cut transversely into halves dividing the discharge there may be a negative incremental resistance between these halves. This negative resistance may be used as the basis of an oscillator working with an efficiency of about 70 per cent. up to frequencies of about 100 kilocycles per second.

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