Entire plasmas can be restructured when electrons are emitted from the boundaries

Campanell, M. D.

doi:10.1063/1.4918339

Title: Entire plasmas can be restructured when electrons are emitted from the boundaries

Abstract

It is well known that electron emission can restructure the thin sheaths at plasma-facing surfaces. But conventional models assume that the plasma's structure negligibly changes (the “presheath” is still thought to be governed by ion acceleration to the Bohm speed). Here, it is shown by theory and simulation that the presheath can take a fundamentally different structure where the emitted electrons entering the quasineutral region cause numerous changes. As a result, gradients of total plasma density, ion and electron pressures, and electric potential throughout the “inverted” presheath can carry different magnitudes, and opposite signs, from Bohm presheaths.

Authors:

Campanell, M. D. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Tue Apr 14 00:00:00 EDT 2015

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1266688

Alternate Identifier(s):: OSTI ID: 1228596

Report Number(s):: LLNL-JRNL-665867
Journal ID: ISSN 1070-664X

Grant/Contract Number:: AC52-07NA27344; AC02-09CH11466

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 22; Journal Issue: 4; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION; plasma sheaths; plasma temperature; plasma density; plasma flows; plasma ionization

Citation Formats


                    Campanell, M. D. Entire plasmas can be restructured when electrons are emitted from the boundaries.  United States: N. p., 2015. 
Web.  doi:10.1063/1.4918339.

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                    Campanell, M. D. Entire plasmas can be restructured when electrons are emitted from the boundaries.  United States.  https://doi.org/10.1063/1.4918339

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                    Campanell, M. D. Tue .  
"Entire plasmas can be restructured when electrons are emitted from the boundaries".  United States.  https://doi.org/10.1063/1.4918339.  https://www.osti.gov/servlets/purl/1266688.

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@article{osti_1266688,

  title        = {Entire plasmas can be restructured when electrons are emitted from the boundaries},

  author       = {Campanell, M. D.},

  abstractNote = {It is well known that electron emission can restructure the thin sheaths at plasma-facing surfaces. But conventional models assume that the plasma's structure negligibly changes (the “presheath” is still thought to be governed by ion acceleration to the Bohm speed). Here, it is shown by theory and simulation that the presheath can take a fundamentally different structure where the emitted electrons entering the quasineutral region cause numerous changes. As a result, gradients of total plasma density, ion and electron pressures, and electric potential throughout the “inverted” presheath can carry different magnitudes, and opposite signs, from Bohm presheaths.},

  doi          = {10.1063/1.4918339},

  journal      = {Physics of Plasmas},

  number       = 4,

  volume       = 22,

  place        = {United States},

  year         = {Tue Apr 14 00:00:00 EDT 2015},

  month        = {Tue Apr 14 00:00:00 EDT 2015}

}

Copy to clipboard

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Works referenced in this record:

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Effects of secondary and thermionic electron emission on the collector and source sheaths of a finite ion temperature plasma using kinetic theory and numerical simulation
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Evidence for strong secondary electron emission in the tokamak scrape-off layer
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Effect of Secondary Electron Emission on Electron Cross-Field Current in $E \times B$ Discharges
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Works referencing / citing this record:

The role of electron induced secondary electron emission from SiO ₂ surfaces in capacitively coupled radio frequency plasmas operated at low pressures
journal, November 2017

Horváth, B.; Daksha, M.; Korolov, I.
Plasma Sources Science and Technology, Vol. 26, Issue 12
DOI: 10.1088/1361-6595/aa963d

Sheath structure in plasma with two species of positive ions and secondary electrons
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Zhao, Xiao-Yun; Xiang, Nong; Ou, Jing
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Kinetic modeling of the electronic response of a dielectric plasma-facing solid
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Bronold, Franz X.; Fehske, Holger
Journal of Physics D: Applied Physics, Vol. 50, Issue 29
DOI: 10.1088/1361-6463/aa7901

Are two plasma equilibrium states possible when the emission coefficient exceeds unity?
journal, May 2017

Campanell, M. D.; Umansky, M. V.
Physics of Plasmas, Vol. 24, Issue 5
DOI: 10.1063/1.4976856

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Similar Records

Title: Entire plasmas can be restructured when electrons are emitted from the boundaries

Abstract

Citation Formats

Potentials of surfaces in space journal, November 1981

Plasma-surface interaction model with secondary electron emission effects journal, March 2004

Non-classical plasma sheaths: space-charge-limited and inverse regimes under strong emission from surfaces journal, July 2014

Combined effects of electron partial thermalization and secondary emission in Hall thruster discharges journal, August 2007

One-dimensional solution to the stable, space-charge-limited emission of secondary electrons from plasma-wall interactions journal, May 2012

Electron-induced secondary electron emission coefficient of lithium, tungsten and stainless steel surfaces exposed to low-pressure plasmas journal, September 2014

Surface-Driven Asymmetry and Instability in the Acceleration Region of Hall Thruster journal, May 2008

The Use of Emissive Probes in Laboratory and Tokamak Plasmas journal, March 2011

Effects of non-Maxwellian electron velocity distribution function on two-stream instability in low-pressure discharges journal, January 2007

Presheath/sheath model with secondary electron emission from two parallel walls journal, October 2002

Effects of cold electron emission on the plasma sheath journal, February 1993

Lunar Prospector measurements of secondary electron emission from lunar regolith journal, January 2009

The Bohm criterion and sheath formation journal, April 1991

Saturation of a floating potential of an electron emitting electrode with increased electron emission: A one-dimensional kinetic model and particle-in-cell simulation journal, January 2012

Effects of secondary and thermionic electron emission on the collector and source sheaths of a finite ion temperature plasma using kinetic theory and numerical simulation journal, February 1993

A snowflake divertor: a possible solution to the power exhaust problem for tokamaks journal, November 2012

Kinetic effects in a Hall thruster discharge journal, May 2007

Heat flow through a Langmuir sheath in the presence of electron emission journal, January 1967

Mode transition of a Hall thruster discharge plasma journal, May 2014

Evidence for strong secondary electron emission in the tokamak scrape-off layer journal, June 2012

The Plasma Boundary of Magnetic Fusion Devices book, January 2000

A long-pulse high-confinement plasma regime in the Experimental Advanced Superconducting Tokamak journal, November 2013

Local effects of biased electrodes in the divertor of NSTX journal, September 2012

Sheaths in laboratory and space plasmas journal, July 2013

Sheath Physics and Boundary Conditions for Edge Plasmas journal, April 2004

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors journal, December 2001

A General Theory of the Plasma of an Arc journal, September 1929

First Experimental Measurements of the Plasma Potential throughout the Presheath and Sheath at a Boundary in a Weakly Collisional Plasma journal, September 2002

Charging and Heat Collection by a Positively Charged Dust Grain in a Plasma journal, July 2014

Effect of Secondary Electron Emission on Electron Cross-Field Current in $E \times B$ Discharges journal, April 2011

Time- and space-resolved optical emission spectroscopy of a helium rf discharge: Investigation of fast secondary electrons journal, February 1993

Kinetic Theory of Plasma Sheaths Surrounding Electron-Emitting Surfaces journal, August 2013

Absence of Debye Sheaths due to Secondary Electron Emission journal, June 2012

Negative plasma potential relative to electron-emitting surfaces journal, September 2013

Breakdown of a Space Charge Limited Regime of a Sheath in a Weakly Collisional Plasma Bounded by Walls with Secondary Electron Emission journal, October 2009

Kinetics of a low-density plasma near a dielectric surface with account for secondary electron emission journal, January 2007

Real time, in-situ measurements of secondary electron emission in DITE journal, December 1990

The Plasma Boundary of Magnetic Fusion Devices journal, January 2001

Absence of Debye Sheaths Due to Secondary Electron Emission text, January 2012

The role of electron induced secondary electron emission from SiO 2 surfaces in capacitively coupled radio frequency plasmas operated at low pressures journal, November 2017

Sheath structure in plasma with two species of positive ions and secondary electrons journal, February 2016

Kinetic modeling of the electronic response of a dielectric plasma-facing solid journal, July 2017

Are two plasma equilibrium states possible when the emission coefficient exceeds unity? journal, May 2017

Potentials of surfaces in space
journal, November 1981

Plasma-surface interaction model with secondary electron emission effects
journal, March 2004

Non-classical plasma sheaths: space-charge-limited and inverse regimes under strong emission from surfaces
journal, July 2014

Combined effects of electron partial thermalization and secondary emission in Hall thruster discharges
journal, August 2007

One-dimensional solution to the stable, space-charge-limited emission of secondary electrons from plasma-wall interactions
journal, May 2012

Electron-induced secondary electron emission coefficient of lithium, tungsten and stainless steel surfaces exposed to low-pressure plasmas
journal, September 2014

Surface-Driven Asymmetry and Instability in the Acceleration Region of Hall Thruster
journal, May 2008

The Use of Emissive Probes in Laboratory and Tokamak Plasmas
journal, March 2011

Effects of non-Maxwellian electron velocity distribution function on two-stream instability in low-pressure discharges
journal, January 2007

Presheath/sheath model with secondary electron emission from two parallel walls
journal, October 2002

Effects of cold electron emission on the plasma sheath
journal, February 1993

Lunar Prospector measurements of secondary electron emission from lunar regolith
journal, January 2009

The Bohm criterion and sheath formation
journal, April 1991

Saturation of a floating potential of an electron emitting electrode with increased electron emission: A one-dimensional kinetic model and particle-in-cell simulation
journal, January 2012

Effects of secondary and thermionic electron emission on the collector and source sheaths of a finite ion temperature plasma using kinetic theory and numerical simulation
journal, February 1993

A snowflake divertor: a possible solution to the power exhaust problem for tokamaks
journal, November 2012

Kinetic effects in a Hall thruster discharge
journal, May 2007

Heat flow through a Langmuir sheath in the presence of electron emission
journal, January 1967

Mode transition of a Hall thruster discharge plasma
journal, May 2014

Evidence for strong secondary electron emission in the tokamak scrape-off layer
journal, June 2012

The Plasma Boundary of Magnetic Fusion Devices
book, January 2000

A long-pulse high-confinement plasma regime in the Experimental Advanced Superconducting Tokamak
journal, November 2013

Local effects of biased electrodes in the divertor of NSTX
journal, September 2012

Sheaths in laboratory and space plasmas
journal, July 2013

Sheath Physics and Boundary Conditions for Edge Plasmas
journal, April 2004

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors
journal, December 2001

A General Theory of the Plasma of an Arc
journal, September 1929

First Experimental Measurements of the Plasma Potential throughout the Presheath and Sheath at a Boundary in a Weakly Collisional Plasma
journal, September 2002

Charging and Heat Collection by a Positively Charged Dust Grain in a Plasma
journal, July 2014

Effect of Secondary Electron Emission on Electron Cross-Field Current in $E \times B$ Discharges
journal, April 2011

Time- and space-resolved optical emission spectroscopy of a helium rf discharge: Investigation of fast secondary electrons
journal, February 1993

Kinetic Theory of Plasma Sheaths Surrounding Electron-Emitting Surfaces
journal, August 2013

Absence of Debye Sheaths due to Secondary Electron Emission
journal, June 2012

Negative plasma potential relative to electron-emitting surfaces
journal, September 2013

Breakdown of a Space Charge Limited Regime of a Sheath in a Weakly Collisional Plasma Bounded by Walls with Secondary Electron Emission
journal, October 2009

Kinetics of a low-density plasma near a dielectric surface with account for secondary electron emission
journal, January 2007

Real time, in-situ measurements of secondary electron emission in DITE
journal, December 1990

The Plasma Boundary of Magnetic Fusion Devices
journal, January 2001

Absence of Debye Sheaths Due to Secondary Electron Emission
text, January 2012

The role of electron induced secondary electron emission from SiO ₂ surfaces in capacitively coupled radio frequency plasmas operated at low pressures
journal, November 2017

Sheath structure in plasma with two species of positive ions and secondary electrons
journal, February 2016

Kinetic modeling of the electronic response of a dielectric plasma-facing solid
journal, July 2017

Are two plasma equilibrium states possible when the emission coefficient exceeds unity?
journal, May 2017