scholarly journals On the formation of a bead structure of spark channels during a discharge in air at atmospheric pressure

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Victor Tarasenko ◽  
Dmitry Beloplotov ◽  
Alexander Burachenko ◽  
Evgenii Baksht
Keyword(s):  
Electric Field ◽  
Rise Time ◽  
Atmospheric Pressure ◽  
Negative Polarity ◽  
Inhomogeneous Electric Field ◽  
Iccd Camera ◽  
Voltage Pulses

The conditions for the formation of spark channels with a bead structure in an inhomogeneous electric field at different polarities of voltage pulses are studied. Voltage pulses with an amplitude of up to 150 kV and a rise time of ≈1.5 µs were applied across a 45-mm point-to-plane gap. Under these conditions, spark channels consisting of bright and dim regions (bead structure) were observed. It is shown that when current is limited, an increase in the rise time and the gap length does not affect the formation of the bead structure. It was found that an increase in the amplitude of voltage pulses leads to an increase in the length of beads. The appearance of the bead structure is more likely at negative polarity of the pointed electrode. The formation of spark channels was studied with a four-channel ICCD camera. 

scholarly journals Generation of super-short avalanche electron beams in SF6

2014 ◽  
Vol 32 (2) ◽  
pp. 331-341 ◽  
Author(s):  
Cheng Zhang ◽  
Victor F. Tarasenko ◽  
Tao Shao ◽  
Dmitry V. Beloplotov ◽  
Mikhail I. Lomaev ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electric Field ◽  
Wave Front ◽  
Electron Beams ◽  
Negative Polarity ◽  
Ionization Wave ◽  
Curvature Radius ◽  
Positive Polarity ◽  
Inhomogeneous Electric Field ◽  
Diffuse Discharge

AbstractIn this work, the generation of a super-short avalanche electron beam (SAEB) in SF6 in an inhomogeneous electric field is studied on two generators with pulse rise times of 0.5 and 2 ns, respectively. The SAEB parameters in SF6 are compared with those obtained in other gases (air, nitrogen, argon, and krypton). It is shown that the SAEB amplitude in SF6 at pressures ranging from 0.05 to 0.2 MPa is commensurable with that in krypton and is much lower than that in air and nitrogen. It is also found that in SF6, SF6 mixture with 2.5% of nitrogen, and other gases, a diffuse discharge is ignited not only at negative polarity but also at positive polarity of the electrode with small curvature radius. Furthermore, the velocity of the ionization wave front in SF6 in an inhomogeneous electric field is studied. Experimental results show that the velocity of the ionization wave front in SF6 is lower than that in air and nitrogen as well as such velocity decreases when the pressure increases from 0.05 to 0.3 MPa in all gases.

scholarly journals Corona with streamers in atmospheric pressure air in a highly inhomogeneous electric field

2020 ◽  
Vol 3 (4) ◽  
Author(s):  
Victor Tarasenko ◽  
Evgenii Baksht ◽  
Vladimir Kuznetsov ◽  
Victor Panarin ◽  
Victor Skakun ◽  
...  
Keyword(s):  
Electric Field ◽  
Atmospheric Pressure ◽  
Research Data ◽  
High Electric Field ◽  
Inhomogeneous Electric Field ◽  
Plane Electrode ◽  
Current Pulses ◽  
Positive Streamers

The paper presents research data on positive and negative coronas in atmospheric pressure air in a highly inhomogeneous electric field. The data show that irrespective of the polarity of pointed electrodes placed in a high electric field (>200 kV/cm), this type of discharge develops via spherical streamers even if the gap voltage rises slowly (£0.2 kV/ms). The start voltage of first positive streamers, compared to negative ones, is higher and the amplitude and the frequency of their current pulses are much lower: about two times and more than two orders of magnitude, respectively. The higher frequency of current pulses from negative spherical streamers provides higher average currents and larger luminous regions of negative coronas compared to positive ones. Positive and negative cylindrical streamers from a pointed to a plane electrode are detected and successive discharge transitions at both polarities are identified.

SIMULATION OF THE FLIGHT OF A DROP OF GALVANIC ELECTROLYTE IN AN INHOMOGENEOUS FIELD OF AN ELECTRIC CATCHER

2020 ◽  
Author(s):  
V.I. Garshin ◽  
◽  
A.R. Lebedev ◽  
S.E. Geraskova ◽  
◽  
...  
Keyword(s):  
Electric Field ◽  
Flight Path ◽  
Inhomogeneous Field ◽  
Inhomogeneous Electric Field ◽  
Trajectory Method

The article shows the relations for modeling an inhomogeneous electric field and the flight path of a drop of galvanic electrolyte in it. Estimates are preliminary. Articles and patents of authors in which non-uniform fields are already used are given. A modified trajectory method is proposed for evaluating the effectiveness of trapping harmful electrolyte droplets.

scholarly journals Response of a weakly magnetized hot QCD medium to an inhomogeneous electric field

2021 ◽  
Vol 103 (7) ◽  
Author(s):  
K. K. Gowthama ◽  
Manu Kurian ◽  
Vinod Chandra
Keyword(s):  
Electric Field ◽  
Inhomogeneous Electric Field

scholarly journals Observations of X-rays from Laboratory Sparks in Air at Atmospheric Pressure under Negative Switching Impulse Voltages

Atmosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 169 ◽  
Author(s):  
Mahbubur Rahman ◽  
Pasan Hettiarachchi ◽  
Vernon Cooray ◽  
Joseph Dwyer ◽  
Vladimir Rakov ◽  
...  
Keyword(s):  
Rise Time ◽  
Atmospheric Pressure ◽  
Opposite Polarity ◽  
X Rays ◽  
X Ray ◽  
Impulse Voltage ◽  
First Time ◽  
Switching Impulses ◽  
Low Rate

We present observations of X-rays from laboratory sparks created in the air at atmospheric pressure by applying an impulse voltage with long (250 µs) rise-time. X-ray production in 35 and 46 cm gaps for three different electrode configurations was studied. The results demonstrate, for the first time, the production of X-rays in gaps subjected to switching impulses. The low rate of rise of the voltage in switching impulses does not significantly reduce the production of X-rays. Additionally, the timing of the X-ray occurrence suggests the possibility that the mechanism of X-ray production by sparks is related to the collision of streamers of opposite polarity.

Sign in / Sign up

Export Citation Format

Share Document