Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field
Abstract
In this paper, two-dimensional electron density measurements are made in a magnetic ring cusp discharge using laser collisional induced fluorescence. The magnet rings are isolated from the anode structure such that they can be biased independently in order to modulate electron flows through the magnetic cusps. Electron density images are captured as a function of bias voltage in order to assess the effects of current flow through the cusp on the spatial extent of the cusp. We anticipated that for a fixed current density being funneled through the magnetic cusp, the leak width would necessarily increase. Unexpectedly, the leak width, as measured by LCIF images, does not increase. This suggests that the current density is not constant, and that possibly either electrons are being heated or additional ionization events are occurring within the cusp. Spatially resolving electron temperature would be needed to determine if electrons are being heated within the cusp. Finally, we also observe breakdown of the anode magnetosheath and formation of anode spots at high bias voltage.
- Authors:
-
[1];
[1];
- Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering and Radiological Sciences
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)
- OSTI Identifier:
- 1474090
- Report Number(s):
- SAND-2018-10182J
Journal ID: ISSN 1361-6595; 667942
- Grant/Contract Number:
- NA0003525; SC0014664
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Plasma Sources Science and Technology
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 5; Journal ID: ISSN 1361-6595
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetized sheath; laser collisional induced fluorescence; anode spot; magnetic cusp
Citation Formats
Arthur, N. A., Foster, J. E., and Barnat, E. V. Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field. United States: N. p., 2018.
Web. doi:10.1088/1361-6595/aac309.
Arthur, N. A., Foster, J. E., & Barnat, E. V. Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field. United States. doi:10.1088/1361-6595/aac309.
Arthur, N. A., Foster, J. E., and Barnat, E. V. Tue .
"Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field". United States. doi:10.1088/1361-6595/aac309. https://www.osti.gov/servlets/purl/1474090.
@article{osti_1474090,
title = {Laser collisional induced fluorescence electron density measurements as a function of ring bias and the onset of anode spot formation in a ring cusp magnetic field},
author = {Arthur, N. A. and Foster, J. E. and Barnat, E. V.},
abstractNote = {In this paper, two-dimensional electron density measurements are made in a magnetic ring cusp discharge using laser collisional induced fluorescence. The magnet rings are isolated from the anode structure such that they can be biased independently in order to modulate electron flows through the magnetic cusps. Electron density images are captured as a function of bias voltage in order to assess the effects of current flow through the cusp on the spatial extent of the cusp. We anticipated that for a fixed current density being funneled through the magnetic cusp, the leak width would necessarily increase. Unexpectedly, the leak width, as measured by LCIF images, does not increase. This suggests that the current density is not constant, and that possibly either electrons are being heated or additional ionization events are occurring within the cusp. Spatially resolving electron temperature would be needed to determine if electrons are being heated within the cusp. Finally, we also observe breakdown of the anode magnetosheath and formation of anode spots at high bias voltage.},
doi = {10.1088/1361-6595/aac309},
journal = {Plasma Sources Science and Technology},
number = 5,
volume = 27,
place = {United States},
year = {2018},
month = {5}
}
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Works referenced in this record:
Cusp width and power flow study at a high power magnetic multipole ion source
journal, January 1987
- Horiike, Hiroshi; Akiba, Masato; Ohara, Yoshihiro
- Physics of Fluids, Vol. 30, Issue 10
The electron spatial distribution and leak width in a magnetic cusp
journal, February 2014
- Hubble, A. A.; Barnat, E. V.; Weatherford, B. R.
- Plasma Sources Science and Technology, Vol. 23, Issue 2
Plasma confinement by localized cusps
journal, January 1976
- Leung, K. N.; Hershkowitz, Noah; MacKenzie, K. R.
- Physics of Fluids, Vol. 19, Issue 7
Collisional processes induced in the n=3 helium sublevels by electrons in a low-pressure plasma. Application to the electron density measurement
journal, December 1985
- Dubreuil, B.; Prigent, P.
- Journal of Physics B: Atomic and Molecular Physics, Vol. 18, Issue 23
Lifetime measurement of the 1 metastable state of argon and krypton with a magneto-optical trap
journal, June 1993
- Katori, Hidetoshi; Shimizu, Fujio
- Physical Review Letters, Vol. 70, Issue 23
Theory of sheaths near positively biased electrodes
conference, June 2016
- Scheiner, Brett; Baalrud, Scott D.; Yee, Benjamin T.
- 2016 IEEE International Conference on Plasma Science (ICOPS)
Leak widths resulting from plasma diffusion in a magnetic cusp
journal, April 1988
- Bosch, R. A.; Gilgenbach, R. M.
- Physics Letters A, Vol. 128, Issue 8
Rate coefficients for collisional population transfer between argon levels at 300°K
journal, October 1978
- Nguyen, T. D.; Sadeghi, N.
- Physical Review A, Vol. 18, Issue 4
Ion Thruster Discharge Performance per Magnetic Field Topography
conference, June 2012
- Wirz, Richard; Goebel, Dan
- 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
Two-dimensional mapping of electron densities and temperatures using laser-collisional induced fluorescence
journal, September 2010
- Barnat, E. V.; Frederickson, K.
- Plasma Sources Science and Technology, Vol. 19, Issue 5
Electron density measurement in a rf helium plasma by laser‐collision induced fluorescence method
journal, September 1996
- Dzierżȩga, K.; Musiol/, K.; Benck, E. C.
- Journal of Applied Physics, Vol. 80, Issue 6
Plasma electron density measurements by the laser- and collision-induced fluorescence method
journal, September 1983
- Tsuchida, K.; Miyake, S.; Kadota, K.
- Plasma Physics, Vol. 25, Issue 9
2D laser-collision induced fluorescence in low-pressure argon discharges
journal, September 2015
- Barnat, E. V.; Weatherford, B. R.
- Plasma Sources Science and Technology, Vol. 24, Issue 5
Measurement of rate coefficients for electron-atom collisions in a helium plasma by laser-induced fluorescence
journal, September 1999
- Denkelmann, R.; Maurmann, S.; Lokajczyk, T.
- Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 32, Issue 19
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
Quenching and excitation transfer in the n = 3 helium sublevels in a low-pressure glow discharge
journal, January 1980
- Dubreuil, B.; Catherinot, A.
- Physical Review A, Vol. 21, Issue 1
Primary electron confinement measurement in a multidipole device
journal, May 1978
- Leung, K. N.; Kribel, R. E.; Goede, A. P. H.
- Physics Letters A, Vol. 66, Issue 2
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
Rayleigh scattering and redistribution of radiation in Helium in a magnetic multipole plasma source
conference, January 2001
- Drepper, P.
- The 15th international conference on spectral line shapes, AIP Conference Proceedings
Theory and simulation of anode spots in low pressure plasmas
journal, November 2017
- Scheiner, Brett; Barnat, Edward V.; Baalrud, Scott D.
- Physics of Plasmas, Vol. 24, Issue 11
Ion source discharge performance and stability
journal, January 1982
- Goebel, Dan M.
- Physics of Fluids, Vol. 25, Issue 6
Characterization of a cylindrical ring-cusp ion source with electrically isolated magnet rings
journal, March 2017
- Arthur, Neil A.; Foster, John E.
- Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 35, Issue 2
Metastable Helium: A New Determination of the Longest Atomic Excited-State Lifetime
journal, July 2009
- Hodgman, S. S.; Dall, R. G.; Byron, L. J.
- Physical Review Letters, Vol. 103, Issue 5
Behaviour of laser-produced high-β plasmas in a spindle-cusp magnetic container
journal, May 1978
- Kogoshi, S.; Sato, K. N.; Sekiguchi, T.
- Journal of Physics D: Applied Physics, Vol. 11, Issue 7
Internal Plasma Properties and Enhanced Performance of 8-Centimeter Ion Thruster Discharge
journal, March 2001
- Foster, John E.; Patterson, Michael J.
- Journal of Propulsion and Power, Vol. 17, Issue 2
Electron-impact excitation and ionization cross sections for ground state and excited helium atoms
journal, July 2008
- Ralchenko, Yu.; Janev, R. K.; Kato, T.
- Atomic Data and Nuclear Data Tables, Vol. 94, Issue 4
Rayleigh scattering and redistribution of radiation in He I plasmas: Measurements and calculations
journal, October 2002
- Drepper, P.; Ferri, S.; Maurmann, S.
- Physical Review E, Vol. 66, Issue 4
Plasma Leakage Through a Low- Line Cusp
journal, August 1975
- Hershkowitz, Noah; Leung, K. N.; Romesser, Thomas
- Physical Review Letters, Vol. 35, Issue 5
Density Measurement of Helium Metastable Atoms in a Plasma by the Laser-Induced Fluorescence Method
journal, March 1984
- Tsuchida, Kazuki
- Japanese Journal of Applied Physics, Vol. 23, Issue Part 1, No. 3
The effect of a magnetic field gradient on anode double layers
journal, April 1992
- Song, B.; Merlino, R. L.; D'Angelo, N.
- Physica Scripta, Vol. 45, Issue 4
Magnetic Multipole Containment of Large Uniform Collisionless Quiescent Plasmas
journal, June 1973
- Limpaecher, Rudolf; MacKenzie, K. R.
- Review of Scientific Instruments, Vol. 44, Issue 6
Improved ion containment using a ring-cusp ion thruster
conference, February 2013
- Sovey, J.
- 16th International Electric Propulsion Conference
Improved ion containment using a ring-cusp ion thruster
journal, September 1984
- Sovey, J. S.
- Journal of Spacecraft and Rockets, Vol. 21, Issue 5
Rate coefficients for collisional population transfer between argon levels at 300°K
journal, October 1978
- Nguyen, T. D.; Sadeghi, N.
- Physical Review A, Vol. 18, Issue 4
Quenching and excitation transfer in the n = 3 helium sublevels in a low-pressure glow discharge
journal, January 1980
- Dubreuil, B.; Catherinot, A.
- Physical Review A, Vol. 21, Issue 1
Rayleigh scattering and redistribution of radiation in He I plasmas: Measurements and calculations
journal, October 2002
- Drepper, P.; Ferri, S.; Maurmann, S.
- Physical Review E, Vol. 66, Issue 4
Density Measurement of Helium Metastable Atoms in a Plasma by the Laser-Induced Fluorescence Method
journal, March 1984
- Tsuchida, Kazuki
- Japanese Journal of Applied Physics, Vol. 23, Issue Part 1, No. 3
Metastable Helium: A New Determination of the Longest Atomic Excited-State Lifetime
journal, July 2009
- Hodgman, S. S.; Dall, R. G.; Byron, L. J.
- Physical Review Letters, Vol. 103, Issue 5
Lifetime measurement of the 1 metastable state of argon and krypton with a magneto-optical trap
journal, June 1993
- Katori, Hidetoshi; Shimizu, Fujio
- Physical Review Letters, Vol. 70, Issue 23
Theory of sheaths near positively biased electrodes
conference, June 2016
- Scheiner, Brett; Baalrud, Scott D.; Yee, Benjamin T.
- 2016 IEEE International Conference on Plasma Science (ICOPS)
Plasma Leakage Through a Low- Line Cusp
journal, August 1975
- Hershkowitz, Noah; Leung, K. N.; Romesser, Thomas
- Physical Review Letters, Vol. 35, Issue 5