Influence of magnetic angle on the E × B drift in a magnetic presheath

Caron, D.; Scime, E. E.

doi:10.1063/5.0046708

Influence of magnetic angle on the E × B drift in a magnetic presheath

Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0046708· OSTI ID:1853558

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West Virginia University, Morgantown, WV (United States); West Virginia Univ., Morgantown, WV (United States)
West Virginia University, Morgantown, WV (United States)

In this work, we provide experimental measurements of the E X B flow above a non-magnetic, absorbing boundary in a magnetized plasma. Measurements are taken as a function of the angle between the background magnetic field and the boundary normal. The measurements are compared to computational predictions for oblique magnetic fields based on Chodura's model. Ion flow measurements were obtained with laser induced fluorescence and the presheath potential structure was measured with an emissive probe. The ions were found to accelerate to nearly 30% of the sound speed parallel to the boundary at oblique angles of the magnetic field (~80°) and the ion speed at the electrostatic sheath edge was found to decrease with angle. The edge of the magnetic presheath has been experimentally determined based on the appearance of the E X B drift and is found to be independent of the angle of the magnetic field. We also demonstrate that laser induced fluorescence is suitable as a non-perturbative diagnostic to measure the electric field in a magnetized sheath.

View Accepted Manuscript (DOE)

Research Organization:: West Virginia University, Morgantown, WV (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0020294

OSTI ID:: 1853558

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (34)

The GBS code for tokamak scrape-off layer simulations Halpern, F. D.; Ricci, P.; Jolliet, S. Journal of Computational Physics, Vol. 315 https://doi.org/10.1016/j.jcp.2016.03.040	journal	June 2016
The hot hELicon eXperiment (HELIX) and the large experiment on instabilities and anisotropy (LEIA) Scime, E. E.; Keiter, P. A.; Balkey, M. M. Journal of Plasma Physics, Vol. 81, Issue 1 https://doi.org/10.1017/S0022377814000890	journal	October 2014
Scrape-off-layer current loops and floating potential in limited tokamak plasmas Loizu, J.; Morales, J. A.; Halpern, F. D. Journal of Plasma Physics, Vol. 83, Issue 6 https://doi.org/10.1017/S0022377817000927	journal	December 2017
Argon ion laser-induced fluorescence with diode lasers Severn, G. D.; Edrich, D. A.; McWilliams, R. Review of Scientific Instruments, Vol. 69, Issue 1 https://doi.org/10.1063/1.1148472	journal	January 1998
Experimental observation of sheath and magnetic presheath over an oblique metallic plate in the presence of a magnetic field Singha, Bornali; Sarma, A.; Chutia, Joyanti Physics of Plasmas, Vol. 9, Issue 2 https://doi.org/10.1063/1.1431973	journal	February 2002
Electric probes for plasmas: The link between theory and instrument Demidov, V. I.; Ratynskaia, S. V.; Rypdal, K. Review of Scientific Instruments, Vol. 73, Issue 10 https://doi.org/10.1063/1.1505099	journal	October 2002
Flow, flow shear, and related profiles in helicon plasmas Scime, E.; Hardin, R.; Biloiu, C. Physics of Plasmas, Vol. 14, Issue 4 https://doi.org/10.1063/1.2716687	journal	April 2007
Model of a source-driven plasma interacting with a wall in an oblique magnetic field Ahedo, E.; Carralero, D. Physics of Plasmas, Vol. 16, Issue 4 https://doi.org/10.1063/1.3119687	journal	April 2009
Scaling of the plasma sheath in a magnetic field parallel to the wall Krasheninnikova, Natalia S.; Tang, Xianzhu; Roytershteyn, Vadim S. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3354106	journal	May 2010
Ionization in inductively coupled argon plasmas studied by optical emission spectroscopy Lee, Young-Kwang; Chung, Chin-Wook Journal of Applied Physics, Vol. 109, Issue 1 https://doi.org/10.1063/1.3530578	journal	January 2011
A comparison of emissive probe techniques for electric potential measurements in a complex plasma Sheehan, J. P.; Raitses, Y.; Hershkowitz, N. Physics of Plasmas, Vol. 18, Issue 7 https://doi.org/10.1063/1.3601354	journal	July 2011
Boundary conditions for plasma fluid models at the magnetic presheath entrance Loizu, J.; Ricci, P.; Halpern, F. D. Physics of Plasmas, Vol. 19, Issue 12 https://doi.org/10.1063/1.4771573	journal	December 2012
Direct measurements of ion dynamics in collisional magnetic presheaths Siddiqui, M. Umair; Jackson, Cory D.; Kim, Justin F. Physics of Plasmas, Vol. 21, Issue 10 https://doi.org/10.1063/1.4897173	journal	October 2014
Models, assumptions, and experimental tests of flows near boundaries in magnetized plasmas Siddiqui, M. Umair; Thompson, Derek S.; Jackson, Cory D. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4943523	journal	March 2016
Measurement of wave-particle interaction and metastable lifetime using laser-induced fluorescence Chu, F.; Hood, R.; Skiff, F. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5089178	journal	April 2019
Plasma–wall transition in an oblique magnetic field Chodura, R. Physics of Fluids, Vol. 25, Issue 9 https://doi.org/10.1063/1.863955	journal	January 1982
Theory of the collisional presheath in an oblique magnetic field Riemann, K. ‐U. Physics of Plasmas, Vol. 1, Issue 3 https://doi.org/10.1063/1.870800	journal	March 1994
The ion velocity (Bohm–Chodura) boundary condition at the entrance to the magnetic presheath in the presence of diamagnetic and E×B drifts in the scrape‐off layer Stangeby, P. C.; Chankin, A. V. Physics of Plasmas, Vol. 2, Issue 3 https://doi.org/10.1063/1.871421	journal	March 1995
The Bohm–Chodura plasma sheath criterion Stangeby, P. C. Physics of Plasmas, Vol. 2, Issue 3 https://doi.org/10.1063/1.871483	journal	March 1995
Structure of the plasma-wall interaction in an oblique magnetic field Ahedo, E. Physics of Plasmas, Vol. 4, Issue 12 https://doi.org/10.1063/1.872606	journal	December 1997
Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field Thompson, Derek S.; Khaziev, Rinat; Fortney-Henriquez, Miguel Physics of Plasmas, Vol. 27, Issue 7 https://doi.org/10.1063/5.0012442	journal	July 2020
The Bohm criterion and sheath formation Riemann, K. -U Journal of Physics D: Applied Physics, Vol. 24, Issue 4 https://doi.org/10.1088/0022-3727/24/4/001	journal	April 1991
Probe measurements of electron-energy distributions in plasmas: what can we measure and how can we achieve reliable results? Godyak, V. A.; Demidov, V. I. Journal of Physics D: Applied Physics, Vol. 44, Issue 23 https://doi.org/10.1088/0022-3727/44/23/233001	journal	May 2011
Simple models for the radial and poloidal E × B drifts in the scrape-off layer of a divertor tokamak: Effects on in/out asymmetries Stangeby, P. C.; Chankin, A. V. Nuclear Fusion, Vol. 36, Issue 7 https://doi.org/10.1088/0029-5515/36/7/I02	journal	July 1996
The Chodura sheath for angles of a few degrees between the magnetic field and the surface of divertor targets and limiters Stangeby, P. C. Nuclear Fusion, Vol. 52, Issue 8 https://doi.org/10.1088/0029-5515/52/8/083012	journal	July 2012
Parallel velocity and temperature of argon ions in an expanding, helicon source driven plasma Sun, Xuan; Biloiu, Costel; Hardin, Robert Plasma Sources Science and Technology, Vol. 13, Issue 3 https://doi.org/10.1088/0963-0252/13/3/001	journal	May 2004
Plasma, presheath, collisional sheath and collisionless sheath potential profiles in weakly ionized, weakly collisional plasma Oksuz, L.; Hershkowitz, N. Plasma Sources Science and Technology, Vol. 14, Issue 1 https://doi.org/10.1088/0963-0252/14/1/022	journal	February 2005
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
Gyrokinetic treatment of a grazing angle magnetic presheath Geraldini, A.; Parra, F. I.; Militello, F. Plasma Physics and Controlled Fusion, Vol. 59, Issue 2 https://doi.org/10.1088/1361-6587/59/2/025015	journal	January 2017
One-dimensional plasma sheath model in front of the divertor plates Tskhakaya, D. Plasma Physics and Controlled Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1361-6587/aa8486	journal	September 2017
On mechanisms of impurity leakage and retention in the tokamak divertor Senichenkov, I. Yu; Kaveeva, E. G.; Sytova, E. A. Plasma Physics and Controlled Fusion, Vol. 61, Issue 4 https://doi.org/10.1088/1361-6587/ab04d0	journal	March 2019
rf Absorption and Ion Heating in Helicon Sources Kline, J. L.; Scime, E. E.; Boivin, R. F. Physical Review Letters, Vol. 88, Issue 19 https://doi.org/10.1103/PhysRevLett.88.195002	journal	April 2002
First Experimental Measurements of the Plasma Potential throughout the Presheath and Sheath at a Boundary in a Weakly Collisional Plasma Oksuz, L.; Hershkowitz, N. Physical Review Letters, Vol. 89, Issue 14 https://doi.org/10.1103/PhysRevLett.89.145001	journal	September 2002
Sheath thickness evaluation for collisionless or weakly collisional bounded plasmas Wang, S. -B.; Wendt, A. E. IEEE Transactions on Plasma Science, Vol. 27, Issue 5 https://doi.org/10.1109/27.799813	journal	January 1999

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Influence of magnetic angle on the E × B drift in a magnetic presheath

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