Response of the plasma to the size of an anode electrode biased near the plasma potential
Abstract
As the size of a positively biased electrode increases, the nature of the interface formed between the electrode and the host plasma undergoes a transition from an electron-rich structure (electron sheath) to an intermediate structure containing both ion and electron rich regions (double layer) and ultimately forms an electron-depleted structure (ion sheath). In this study, measurements are performed to further test how the size of an electron-collecting electrode impacts the plasma discharge the electrode is immersed in. This is accomplished using a segmented disk electrode in which individual segments are individually biased to change the effective surface area of the anode. Measurements of bulk plasma parameters such as the collected current density, plasma potential, electron density, electron temperature and optical emission are made as both the size and the bias placed on the electrode are varied. Abrupt transitions in the plasma parameters resulting from changing the electrode surface area are identified in both argon and helium discharges and are compared to the interface transitions predicted by global current balance [S. D. Baalrud, N. Hershkowitz, and B. Longmier, Phys. Plasmas 14, 042109 (2007)]. While the size-dependent transitions in argon agree, the size-dependent transitions observed in helium systematically occur at lower electrodemore »
- Authors:
-
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1426895
- Alternate Identifier(s):
- OSTI ID: 1223593
- Report Number(s):
- SAND2014-17544J
Journal ID: ISSN 1070-664X; PHPAEN; 537502; TRN: US1802973
- Grant/Contract Number:
- AC04-94AL85000; AC04-94SL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 10; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 47 OTHER INSTRUMENTATION; Interfaces; Surface and interface chemistry; Ionospheric physics; Optical metrology; Ionospheric dynamics; Magnetospheric dynamics; Plasma interactions; Electrodes; Current density; Classical electromagnetism
Citation Formats
Barnat, E. V., Laity, G. R., and Baalrud, S. D. Response of the plasma to the size of an anode electrode biased near the plasma potential. United States: N. p., 2014.
Web. doi:10.1063/1.4897927.
Barnat, E. V., Laity, G. R., & Baalrud, S. D. Response of the plasma to the size of an anode electrode biased near the plasma potential. United States. https://doi.org/10.1063/1.4897927
Barnat, E. V., Laity, G. R., and Baalrud, S. D. Wed .
"Response of the plasma to the size of an anode electrode biased near the plasma potential". United States. https://doi.org/10.1063/1.4897927. https://www.osti.gov/servlets/purl/1426895.
@article{osti_1426895,
title = {Response of the plasma to the size of an anode electrode biased near the plasma potential},
author = {Barnat, E. V. and Laity, G. R. and Baalrud, S. D.},
abstractNote = {As the size of a positively biased electrode increases, the nature of the interface formed between the electrode and the host plasma undergoes a transition from an electron-rich structure (electron sheath) to an intermediate structure containing both ion and electron rich regions (double layer) and ultimately forms an electron-depleted structure (ion sheath). In this study, measurements are performed to further test how the size of an electron-collecting electrode impacts the plasma discharge the electrode is immersed in. This is accomplished using a segmented disk electrode in which individual segments are individually biased to change the effective surface area of the anode. Measurements of bulk plasma parameters such as the collected current density, plasma potential, electron density, electron temperature and optical emission are made as both the size and the bias placed on the electrode are varied. Abrupt transitions in the plasma parameters resulting from changing the electrode surface area are identified in both argon and helium discharges and are compared to the interface transitions predicted by global current balance [S. D. Baalrud, N. Hershkowitz, and B. Longmier, Phys. Plasmas 14, 042109 (2007)]. While the size-dependent transitions in argon agree, the size-dependent transitions observed in helium systematically occur at lower electrode sizes than those nominally derived from prediction. Thus, the discrepancy in helium is anticipated to be caused by the finite size of the interface that increases the effective area offered to the plasma for electron loss to the electrode.},
doi = {10.1063/1.4897927},
journal = {Physics of Plasmas},
number = 10,
volume = 21,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 2014},
month = {Wed Oct 01 00:00:00 EDT 2014}
}
Web of Science
Works referenced in this record:
Two-dimensional laser collision-induced fluorescence measurements of plasma properties near an RF plasma cathode extraction aperture
journal, October 2012
- Weatherford, B. R.; Barnat, E. V.; Foster, J. E.
- Plasma Sources Science and Technology, Vol. 21, Issue 5
Plasma Potential Measurements by Electron Emissive Probes
journal, April 1966
- Kemp, Robert F.; Sellen, J. M.
- Review of Scientific Instruments, Vol. 37, Issue 4
Equilibrium states of anodic double layers
journal, April 2009
- Baalrud, S. D.; Longmier, B.; Hershkowitz, N.
- Plasma Sources Science and Technology, Vol. 18, Issue 3
Emissive probes
journal, November 2011
- Sheehan, J. P.; Hershkowitz, N.
- Plasma Sources Science and Technology, Vol. 20, Issue 6
Pulsating fireballs with high-frequency sheath–plasma instabilities
journal, June 2011
- Stenzel, R. L.; Gruenwald, J.; Ionita, C.
- Plasma Sources Science and Technology, Vol. 20, Issue 4
Different modes of electron heating in dual-frequency capacitively coupled radio frequency discharges
journal, July 2009
- Schulze, J.; Donkó, Z.; Luggenhölscher, D.
- Plasma Sources Science and Technology, Vol. 18, Issue 3
Principles of Plasma Discharges and Materials Processing
book, January 2005
- Lieberman, Michael A.; Lichtenberg, Allan J.
Kinetic Theory of Plasma Sheaths Surrounding Electron-Emitting Surfaces
journal, August 2013
- Sheehan, J. P.; Hershkowitz, N.; Kaganovich, I. D.
- Physical Review Letters, Vol. 111, Issue 7
Properties and control of anode double layer oscillations and related phenomena
journal, July 2003
- Pohoaţǎ, Valentin; Popa, Gheorghe; Schrittwieser, Roman
- Physical Review E, Vol. 68, Issue 1
Steady‐state ion pumping of a potential dip near an electron collecting anode
journal, August 1986
- Forest, Cary; Hershkowitz, Noah
- Journal of Applied Physics, Vol. 60, Issue 4
Sheaths: More complicated than you think
journal, May 2005
- Hershkowitz, Noah
- Physics of Plasmas, Vol. 12, Issue 5
Cold-cathode discharges and breakdown in argon: surface and gas phase production of secondary electrons
journal, January 1999
- Phelps, A. V.; Petrovic, Z. Lj
- Plasma Sources Science and Technology, Vol. 8, Issue 3
Global nonambipolar flow: Plasma confinement where all electrons are lost to one boundary and all positive ions to another boundary
journal, April 2007
- Baalrud, S. D.; Hershkowitz, N.; Longmier, B.
- Physics of Plasmas, Vol. 14, Issue 4
Plasma nonuniformities induced by dissimilar electrode metals
journal, July 2005
- Barnat, E. V.; Hebner, G. A.
- Journal of Applied Physics, Vol. 98, Issue 1
Transit time instabilities in an inverted fireball. II. Mode jumping and nonlinearities
journal, January 2011
- Stenzel, R. L.; Gruenwald, J.; Fonda, B.
- Physics of Plasmas, Vol. 18, Issue 1
Effect of the reference electrode size on the ionization instability in the plasma sheath of a small positively biased electrode
journal, June 2011
- Bliokh, Y. P.; Brodsky, Yu. L.; Chashka, Kh. B.
- Journal of Applied Physics, Vol. 109, Issue 11
The Interaction of Electron and Positive Ion Space Charges in Cathode Sheaths
journal, June 1929
- Langmuir, Irving
- Physical Review, Vol. 33, Issue 6
The plasma–sheath boundary region
journal, October 2003
- Franklin, R. N.
- Journal of Physics D: Applied Physics, Vol. 36, Issue 22
Some experimental and theoretical results on the anodic patterns in plasma discharge
journal, June 2006
- Gurlui, S.; Agop, M.; Strat, M.
- Physics of Plasmas, Vol. 13, Issue 6
Transit time instabilities in an inverted fireball. I. Basic properties
journal, January 2011
- Stenzel, R. L.; Gruenwald, J.; Fonda, B.
- Physics of Plasmas, Vol. 18, Issue 1
The influence of the secondary electron induced asymmetry on the electrical asymmetry effect in capacitively coupled plasmas
journal, August 2013
- Korolov, Ihor; Derzsi, Aranka; Donkó, Zoltán
- Applied Physics Letters, Vol. 103, Issue 6
Works referencing / citing this record:
Comparative measurement of plasma potential with tube probe and Langmuir probe
journal, November 2018
- Li, Jian-quan; Lu, Wen-qi; Xu, Jun
- AIP Advances, Vol. 8, Issue 11
Plasma boundary induced electron-to-ion sheath transition in planar DC discharge
journal, January 2020
- Barnwal, Prashant K.; Kar, S.; Narayanan, R.
- Physics of Plasmas, Vol. 27, Issue 1
Glow discharges with electrostatic confinement of fast electrons
journal, May 2015
- Kolobov, V. I.; Metel, A. S.
- Journal of Physics D: Applied Physics, Vol. 48, Issue 23
Moderate pressure plasma source of nonthermal electrons
journal, May 2018
- Gershman, S.; Raitses, Y.
- Journal of Physics D: Applied Physics, Vol. 51, Issue 23
Comments on the Langmuir probe measurements of radio-frequency capacitive argon–hydrogen mixture discharge at low pressure
journal, May 2018
- Tanışlı, Murat; Şahi̇n, Nesli̇han; Demi̇r, Süleyman
- Canadian Journal of Physics, Vol. 96, Issue 5