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Title: Simulation of decelerating streamers in inhomogeneous atmosphere with implications for runaway electron generation

Abstract

The dynamics of positive and negative streamers is numerically simulated in atmospheric pressure air in the range of parameters corresponding to the streamer deceleration and termination in the middle of the discharge gap. A detailed comparison with experiments in air at constant and variable density demonstrates good agreement between the 2D simulation results and the observations. It is shown that positive and negative streamers behave in radically different ways when decelerating and stopping. When the head potential drops, the negative streamer transits to the mode in which the propagation is due to the forward electron drift. In this case, the radius of the ionization wave front increases, whereas the electric field at the streamer head decreases further and the streamer stops. Its head diameter continues to increase due to the slow drift of free electrons in the residual under-breakdown field. On the contrary, the only advancement mechanism for a positive streamer with a decreasing head potential is a decrease in the effective radius of the ionization wave, leading to a local increase in the electric field. This mechanism makes it possible to compensate for the reduction in the efficiency of gas photoionization at small head diameters. A qualitative 1D modelmore » is suggested to describe streamer deceleration and stopping for different discharge polarities. Estimates show that, during positive streamer stopping, the local electric field at the streamer head can exceed the threshold corresponding to the transition of electrons to the runaway mode when the head potential (relative to the surrounding space) decreases to ∼1.2 kV in atmospheric pressure air. In this case, pulsed generation of a beam of runaway electrons directed into the channel of a stopping positive streamer can occur. The energy of the formed pulsed electron beam depends on the intensity of photoionization in front of the streamer head. This energy can vary from 700 V (when increasing the photoionization rate by a factor of 10 with respect to the value in atmospheric pressure air) to 2.6 kV (when decreasing the photoionization rate by a factor of 1000). It is possible that this behavior of decelerating positive streamers can explain the observed bursts of x-ray radiation during the streamer propagation in long air gaps.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States). Mechanical and Aerospace Engineering Dept.
  2. Moscow Inst. of Physics and Technology, Dolgoprudny (Russia)
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States); Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1849202
Alternate Identifier(s):
OSTI ID: 1970678
Grant/Contract Number:  
FE0026825; SC0021330
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 129; Journal Issue: 6; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Photoionization; Atmospheric radiation; Electrical properties and parameters; Numerical methods; Streamer discharge; Gas discharges; Runaway electrons; Vacuum ultraviolet radiation

Citation Formats

Starikovskiy, A. Yu., Aleksandrov, N. L., and Shneider, M. N. Simulation of decelerating streamers in inhomogeneous atmosphere with implications for runaway electron generation. United States: N. p., 2021. Web. doi:10.1063/5.0037669.
Starikovskiy, A. Yu., Aleksandrov, N. L., & Shneider, M. N. Simulation of decelerating streamers in inhomogeneous atmosphere with implications for runaway electron generation. United States. https://doi.org/10.1063/5.0037669
Starikovskiy, A. Yu., Aleksandrov, N. L., and Shneider, M. N. Mon . "Simulation of decelerating streamers in inhomogeneous atmosphere with implications for runaway electron generation". United States. https://doi.org/10.1063/5.0037669. https://www.osti.gov/servlets/purl/1849202.
@article{osti_1849202,
title = {Simulation of decelerating streamers in inhomogeneous atmosphere with implications for runaway electron generation},
author = {Starikovskiy, A. Yu. and Aleksandrov, N. L. and Shneider, M. N.},
abstractNote = {The dynamics of positive and negative streamers is numerically simulated in atmospheric pressure air in the range of parameters corresponding to the streamer deceleration and termination in the middle of the discharge gap. A detailed comparison with experiments in air at constant and variable density demonstrates good agreement between the 2D simulation results and the observations. It is shown that positive and negative streamers behave in radically different ways when decelerating and stopping. When the head potential drops, the negative streamer transits to the mode in which the propagation is due to the forward electron drift. In this case, the radius of the ionization wave front increases, whereas the electric field at the streamer head decreases further and the streamer stops. Its head diameter continues to increase due to the slow drift of free electrons in the residual under-breakdown field. On the contrary, the only advancement mechanism for a positive streamer with a decreasing head potential is a decrease in the effective radius of the ionization wave, leading to a local increase in the electric field. This mechanism makes it possible to compensate for the reduction in the efficiency of gas photoionization at small head diameters. A qualitative 1D model is suggested to describe streamer deceleration and stopping for different discharge polarities. Estimates show that, during positive streamer stopping, the local electric field at the streamer head can exceed the threshold corresponding to the transition of electrons to the runaway mode when the head potential (relative to the surrounding space) decreases to ∼1.2 kV in atmospheric pressure air. In this case, pulsed generation of a beam of runaway electrons directed into the channel of a stopping positive streamer can occur. The energy of the formed pulsed electron beam depends on the intensity of photoionization in front of the streamer head. This energy can vary from 700 V (when increasing the photoionization rate by a factor of 10 with respect to the value in atmospheric pressure air) to 2.6 kV (when decreasing the photoionization rate by a factor of 1000). It is possible that this behavior of decelerating positive streamers can explain the observed bursts of x-ray radiation during the streamer propagation in long air gaps.},
doi = {10.1063/5.0037669},
journal = {Journal of Applied Physics},
number = 6,
volume = 129,
place = {United States},
year = {Mon Feb 08 00:00:00 EST 2021},
month = {Mon Feb 08 00:00:00 EST 2021}
}

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