Gasdynamic self-structure under unstable evaporation of cathodes in a pulsed unipolar discharge

1991 ◽  
Vol 31 (3) ◽  
pp. 347-351
Author(s):  
V. G. Zhogol' ◽  
V. F. Reznichenko ◽  
S. V. Selishchev ◽  
A. A. Uglov
Keyword(s):  
Unipolar Discharge

scholarly journals Spark channel dynamics in railgun switches in unipolar and oscillatory discharges

2019 ◽  
Vol 37 (2) ◽  
pp. 223-230 ◽  
Author(s):  
A.V. Kharlov
Keyword(s):  
Electrode Materials ◽  
Plasma Channel ◽  
Capacitor Bank ◽  
Electrode Erosion ◽  
Channel Dynamics ◽  
Unipolar Pulse ◽  
Wide Range ◽  
Unipolar Discharge ◽  
Consistent Treatment ◽  
Spark Channel

AbstractSpark gaps are often used to commute energy in the discharge of a capacitive storage to a load. In some applications, a unipolar pulse is not feasible, and an oscillatory (underdamped sinusoidal) regime must be realized for the discharge of the capacitor bank. Spark gaps, which were developed for unipolar discharge, cannot be directly employed in an under-damped (oscillatory) regime since at the transition of the current through zero, the spark channel could stop motion and ignite in the following half period. This work has two main objectives: (i) To develop and test a simulation model of spark channel motion in linear rail geometry, which must be valid for both the oscillatory and unipolar regimes of capacitor bank discharge; and (ii) to investigate arc motion and electrode heating, depending on the current and charge transfer, over a wide range of operation. A self-consistent treatment of plasma motion and electrode heating (taking into account the radiation of a plasma channel) is applied in the present paper, and it is shown that radiation can significantly impact on the temperature of the electrodes. Electrode ablation and the temperature dependence of the main thermal parameters are also taken into account. Stainless steel (Cr/Ni/Ti 18/10/0.6÷0.8), copper (Cu), chromium (Cr), tungsten (W), and molybdenum (Mo) are used here as electrode materials since these materials are widely used for the manufacture of electrodes. The results of numerical calculations are compared with experimental results, and conditions are defined for reduced electrode erosion.

Entry of an Sn-Bi alloy into a unipolar discharge in helium and air

1968 ◽  
Vol 8 (3) ◽  
pp. 246-247
Author(s):  
D. P. Milenina ◽  
N. K. Rudnevskii
Keyword(s):  
Unipolar Discharge

Spectroscopic studies of a unipolar discharge in argon

1969 ◽  
Vol 10 (4) ◽  
pp. 378-380
Author(s):  
G. P. Startsev ◽  
K. I. Taganov ◽  
Z. I. Shlepkova
Keyword(s):  
Spectroscopic Studies ◽  
Unipolar Discharge

Modelling of the Plasma–Sheath Boundary Region in Wall-Stabilized Arc Plasmas: Unipolar Discharge Properties

2017 ◽  
Vol 38 (1) ◽  
pp. 147-176 ◽  
Author(s):  
B. Mancinelli ◽  
L. Prevosto ◽  
J. C. Chamorro ◽  
F. O. Minotti ◽  
H. Kelly
Keyword(s):  
Boundary Region ◽  
Plasma Sheath ◽  
Unipolar Discharge ◽  
Arc Plasmas

High enhancement factor in low-power unipolar discharge arc assisted laser induced plasma spectroscopy

2020 ◽  
Vol 174 ◽  
pp. 105996
Author(s):  
Xianshuang Wang ◽  
Angze Li ◽  
Xiangjun Xu ◽  
Yage He ◽  
Suling Qiu ◽  
...  
Keyword(s):  
Low Power ◽  
Enhancement Factor ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Unipolar Discharge
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