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

Arthur, N. A.; Foster, J. E.; Barnat, E. V.

doi:10.1088/1361-6595/aac309

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

Journal Article · Tue May 08 00:00:00 EDT 2018 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/aac309· OSTI ID:1474090

^[1];

^[1]; Barnat, E. V. ^[2]

Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering and Radiological Sciences
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)

Grant/Contract Number:: NA0003525; SC0014664

OSTI ID:: 1474090

Report Number(s):: SAND-2018-10182J; 667942

Journal Information:: Plasma Sources Science and Technology, Vol. 27, Issue 5; ISSN 1361-6595

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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References (37)

Cusp width and power flow study at a high power magnetic multipole ion source Horiike, Hiroshi; Akiba, Masato; Ohara, Yoshihiro Physics of Fluids, Vol. 30, Issue 10 https://doi.org/10.1063/1.866503	journal	January 1987
The electron spatial distribution and leak width in a magnetic cusp Hubble, A. A.; Barnat, E. V.; Weatherford, B. R. Plasma Sources Science and Technology, Vol. 23, Issue 2 https://doi.org/10.1088/0963-0252/23/2/022001	journal	February 2014
Plasma confinement by localized cusps Leung, K. N.; Hershkowitz, Noah; MacKenzie, K. R. Physics of Fluids, Vol. 19, Issue 7 https://doi.org/10.1063/1.861575	journal	January 1976
Principles of Plasma Discharges and Materials Processing Lieberman, Michael A.; Lichtenberg, Allan J. https://doi.org/10.1002/0471724254	book	January 2005
Collisional processes induced in the n=3 helium sublevels by electrons in a low-pressure plasma. Application to the electron density measurement Dubreuil, B.; Prigent, P. Journal of Physics B: Atomic and Molecular Physics, Vol. 18, Issue 23 https://doi.org/10.1088/0022-3700/18/23/012	journal	December 1985
Fundamentals of Electric Propulasion Goebel, Dan M.; Katz, Ira https://doi.org/10.1002/9780470436448	book	July 2008
Theory of sheaths near positively biased electrodes Scheiner, Brett; Baalrud, Scott D.; Yee, Benjamin T. 2016 IEEE International Conference on Plasma Science (ICOPS) https://doi.org/10.1109/plasma.2016.7534341	conference	June 2016
Leak widths resulting from plasma diffusion in a magnetic cusp Bosch, R. A.; Gilgenbach, R. M. Physics Letters A, Vol. 128, Issue 8 https://doi.org/10.1016/0375-9601(88)90125-9	journal	April 1988
Ion Thruster Discharge Performance per Magnetic Field Topography Wirz, Richard; Goebel, Dan 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit https://doi.org/10.2514/6.2006-4487	conference	June 2012
Two-dimensional mapping of electron densities and temperatures using laser-collisional induced fluorescence Barnat, E. V.; Frederickson, K. Plasma Sources Science and Technology, Vol. 19, Issue 5 https://doi.org/10.1088/0963-0252/19/5/055015	journal	September 2010
Electron density measurement in a rf helium plasma by laser‐collision induced fluorescence method Dzierżȩga, K.; Musiol/, K.; Benck, E. C. Journal of Applied Physics, Vol. 80, Issue 6 https://doi.org/10.1063/1.363260	journal	September 1996
Plasma electron density measurements by the laser- and collision-induced fluorescence method Tsuchida, K.; Miyake, S.; Kadota, K. Plasma Physics, Vol. 25, Issue 9 https://doi.org/10.1088/0032-1028/25/9/003	journal	September 1983
2D laser-collision induced fluorescence in low-pressure argon discharges Barnat, E. V.; Weatherford, B. R. Plasma Sources Science and Technology, Vol. 24, Issue 5 https://doi.org/10.1088/0963-0252/24/5/055024	journal	September 2015
Measurement of rate coefficients for electron-atom collisions in a helium plasma by laser-induced fluorescence Denkelmann, R.; Maurmann, S.; Lokajczyk, T. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 32, Issue 19 https://doi.org/10.1088/0953-4075/32/19/305	journal	September 1999
Two-dimensional laser collision-induced fluorescence measurements of plasma properties near an RF plasma cathode extraction aperture Weatherford, B. R.; Barnat, E. V.; Foster, J. E. Plasma Sources Science and Technology, Vol. 21, Issue 5 https://doi.org/10.1088/0963-0252/21/5/055030	journal	October 2012
Primary electron confinement measurement in a multidipole device Leung, K. N.; Kribel, R. E.; Goede, A. P. H. Physics Letters A, Vol. 66, Issue 2 https://doi.org/10.1016/0375-9601(78)90011-7	journal	May 1978
Equilibrium states of anodic double layers Baalrud, S. D.; Longmier, B.; Hershkowitz, N. Plasma Sources Science and Technology, Vol. 18, Issue 3 https://doi.org/10.1088/0963-0252/18/3/035002	journal	April 2009
Emissive probes Sheehan, J. P.; Hershkowitz, N. Plasma Sources Science and Technology, Vol. 20, Issue 6 https://doi.org/10.1088/0963-0252/20/6/063001	journal	November 2011
Improved ion containment using a ring-cusp ion thruster Sovey, J. S. Journal of Spacecraft and Rockets, Vol. 21, Issue 5 https://doi.org/10.2514/3.25684	journal	September 1984
Rayleigh scattering and redistribution of radiation in Helium in a magnetic multipole plasma source Drepper, P. The 15th international conference on spectral line shapes, AIP Conference Proceedings https://doi.org/10.1063/1.1370615	conference	January 2001
Theory and simulation of anode spots in low pressure plasmas Scheiner, Brett; Barnat, Edward V.; Baalrud, Scott D. Physics of Plasmas, Vol. 24, Issue 11 https://doi.org/10.1063/1.4999477	journal	November 2017
Ion source discharge performance and stability Goebel, Dan M. Physics of Fluids, Vol. 25, Issue 6 https://doi.org/10.1063/1.863842	journal	January 1982
Characterization of a cylindrical ring-cusp ion source with electrically isolated magnet rings Arthur, Neil A.; Foster, John E. Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 35, Issue 2 https://doi.org/10.1116/1.4976746	journal	March 2017
Metastable Helium: A New Determination of the Longest Atomic Excited-State Lifetime Hodgman, S. S.; Dall, R. G.; Byron, L. J. Physical Review Letters, Vol. 103, Issue 5 https://doi.org/10.1103/physrevlett.103.053002	journal	July 2009
Behaviour of laser-produced high-β plasmas in a spindle-cusp magnetic container Kogoshi, S.; Sato, K. N.; Sekiguchi, T. Journal of Physics D: Applied Physics, Vol. 11, Issue 7 https://doi.org/10.1088/0022-3727/11/7/007	journal	May 1978
Internal Plasma Properties and Enhanced Performance of 8-Centimeter Ion Thruster Discharge Foster, John E.; Patterson, Michael J. Journal of Propulsion and Power, Vol. 17, Issue 2 https://doi.org/10.2514/2.5759	journal	March 2001
Electron-impact excitation and ionization cross sections for ground state and excited helium atoms Ralchenko, Yu.; Janev, R. K.; Kato, T. Atomic Data and Nuclear Data Tables, Vol. 94, Issue 4 https://doi.org/10.1016/j.adt.2007.11.003	journal	July 2008
Rayleigh scattering and redistribution of radiation in He I plasmas: Measurements and calculations Drepper, P.; Ferri, S.; Maurmann, S. Physical Review E, Vol. 66, Issue 4 https://doi.org/10.1103/physreve.66.046404	journal	October 2002
Density Measurement of Helium Metastable Atoms in a Plasma by the Laser-Induced Fluorescence Method Tsuchida, Kazuki Japanese Journal of Applied Physics, Vol. 23, Issue Part 1, No. 3 https://doi.org/10.1143/jjap.23.338	journal	March 1984
The effect of a magnetic field gradient on anode double layers Song, B.; Merlino, R. L.; D'Angelo, N. Physica Scripta, Vol. 45, Issue 4 https://doi.org/10.1088/0031-8949/45/4/019	journal	April 1992
Magnetic Multipole Containment of Large Uniform Collisionless Quiescent Plasmas Limpaecher, Rudolf; MacKenzie, K. R. Review of Scientific Instruments, Vol. 44, Issue 6 https://doi.org/10.1063/1.1686231	journal	June 1973
Improved ion containment using a ring-cusp ion thruster Sovey, J. 16th International Electric Propulsion Conference https://doi.org/10.2514/6.1982-1928	conference	February 2013
Rate coefficients for collisional population transfer between $3 p^{5} 4 p$ argon levels at 300°K Nguyen, T. D.; Sadeghi, N. Physical Review A, Vol. 18, Issue 4 https://doi.org/10.1103/PhysRevA.18.1388	journal	October 1978
Quenching and excitation transfer in the n = 3 helium sublevels in a low-pressure glow discharge Dubreuil, B.; Catherinot, A. Physical Review A, Vol. 21, Issue 1 https://doi.org/10.1103/PhysRevA.21.188	journal	January 1980
Lifetime measurement of the 1 $s_{5}$ metastable state of argon and krypton with a magneto-optical trap Katori, Hidetoshi; Shimizu, Fujio Physical Review Letters, Vol. 70, Issue 23 https://doi.org/10.1103/PhysRevLett.70.3545	journal	June 1993
Plasma Leakage Through a Low- $β$ Line Cusp Hershkowitz, Noah; Leung, K. N.; Romesser, Thomas Physical Review Letters, Vol. 35, Issue 5 https://doi.org/10.1103/PhysRevLett.35.277	journal	August 1975
Theory and simulation of anode spots in low pressure plasmas Scheiner, Brett; Barnat, Edward; Baalrud, Scott arXiv https://doi.org/10.48550/arxiv.1708.02661	text	January 2017

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