Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients

Pusateri, Elise N.; Morris, Heidi E.; Nelson, Eric M.; Ji, Wei

doi:10.1002/2015JD023100

Title: Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients

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Abstract

Electromagnetic pulse (EMP) events produce low-energy conduction electrons from Compton electron or photoelectron ionizations with air. It is important to understand how conduction electrons interact with air in order to accurately predict EMP evolution and propagation. An electron swarm model can be used to monitor the time evolution of conduction electrons in an environment characterized by electric field and pressure. Here a swarm model is developed that is based on the coupled ordinary differential equations (ODEs) described by Higgins et al. (1973), hereinafter HLO. The ODEs characterize the swarm electric field, electron temperature, electron number density, and drift velocity. Important swarm parameters, the momentum transfer collision frequency, energy transfer collision frequency, and ionization rate, are calculated and compared to the previously reported fitted functions given in HLO. These swarm parameters are found using BOLSIG+, a two term Boltzmann solver developed by Hagelaar and Pitchford (2005), which utilizes updated cross sections from the LXcat website created by Pancheshnyi et al. (2012). We validate the swarm model by comparing to experimental effective ionization coefficient data in Dutton (1975) and drift velocity data in Ruiz-Vargas et al. (2010). In addition, we report on electron equilibrium temperatures and times for a uniform electric fieldmore »« less

Authors:

Pusateri, Elise N. ^[1]; Morris, Heidi E. ^[1]; Nelson, Eric M. ^[1];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)

Publication Date:: Tue Aug 04 00:00:00 EDT 2015

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1224050

Report Number(s):: LA-UR-15-20109
Journal ID: ISSN 2169-897X; TRN: US1600422

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Geophysical Research: Atmospheres

Additional Journal Information:: Journal Volume: 120; Journal Issue: 15; Journal ID: ISSN 2169-897X

Publisher:: American Geophysical Union

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats


                    Pusateri, Elise N., Morris, Heidi E., Nelson, Eric M., and Ji, Wei. Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients.  United States: N. p., 2015. 
Web.  doi:10.1002/2015JD023100.

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                    Pusateri, Elise N., Morris, Heidi E., Nelson, Eric M., & Ji, Wei. Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients.  United States.  https://doi.org/10.1002/2015JD023100

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                    Pusateri, Elise N., Morris, Heidi E., Nelson, Eric M., and Ji, Wei. Tue .  
"Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients".  United States.  https://doi.org/10.1002/2015JD023100.  https://www.osti.gov/servlets/purl/1224050.

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@article{osti_1224050,

  title        = {Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients},

  author       = {Pusateri, Elise N. and Morris, Heidi E. and Nelson, Eric M. and Ji, Wei},

  abstractNote = {Electromagnetic pulse (EMP) events produce low-energy conduction electrons from Compton electron or photoelectron ionizations with air. It is important to understand how conduction electrons interact with air in order to accurately predict EMP evolution and propagation. An electron swarm model can be used to monitor the time evolution of conduction electrons in an environment characterized by electric field and pressure. Here a swarm model is developed that is based on the coupled ordinary differential equations (ODEs) described by Higgins et al. (1973), hereinafter HLO. The ODEs characterize the swarm electric field, electron temperature, electron number density, and drift velocity. Important swarm parameters, the momentum transfer collision frequency, energy transfer collision frequency, and ionization rate, are calculated and compared to the previously reported fitted functions given in HLO. These swarm parameters are found using BOLSIG+, a two term Boltzmann solver developed by Hagelaar and Pitchford (2005), which utilizes updated cross sections from the LXcat website created by Pancheshnyi et al. (2012). We validate the swarm model by comparing to experimental effective ionization coefficient data in Dutton (1975) and drift velocity data in Ruiz-Vargas et al. (2010). In addition, we report on electron equilibrium temperatures and times for a uniform electric field of 1 StatV/cm for atmospheric heights from 0 to 40 km. We show that the equilibrium temperature and time are sensitive to the modifications in the collision frequencies and ionization rate based on the updated electron interaction cross sections.},

  doi          = {10.1002/2015JD023100},

  journal      = {Journal of Geophysical Research: Atmospheres},

  number       = 15,

  volume       = 120,

  place        = {United States},

  year         = {Tue Aug 04 00:00:00 EDT 2015},

  month        = {Tue Aug 04 00:00:00 EDT 2015}

}

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