Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field
Abstract
This article describes experimental evidence that the magnetic presheath is a fully three-dimensional structure modified by ion–neutral collisions. Velocity distributions of both ions and neutrals, obtained via laser-induced fluorescence, show that cross field ion drifts do not result from entrainment of ions in a flowing neutral background. Ion flows parallel to E x B arise and accelerate to as much as 0.2cs within several ion gyroradii of the boundary surface, where cs is the sound speed. Within measurement resolution, the onset of the E x B aligned flow occurs at the same distance to the surface that ions begin to deflect from travel along magnetic field lines. Collisional fluid and particle-in-cell simulations of the boundary region are compared to the experimental measurements. We find that, in contrast to the classical collisionless Chodura model, collisional effects between the ions and the non-flowing neutral population are essential to quantitatively predict the observed ion drift velocities. No momentum coupling between ions and neutrals, separable from noise and other effects, is observed in either signal. Here, we discuss several explanations and implications of this observation.
- Authors:
-
[1];
[2];
[3];
[2];
[3];
[2]
- West Virginia Univ., Morgantown, WV (United States); Phase Four, Inc., El Segundo, CA (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- West Virginia Univ., Morgantown, WV (United States)
- Publication Date:
- Research Org.:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
- OSTI Identifier:
- 1755893
- Alternate Identifier(s):
- OSTI ID: 1639127
- Grant/Contract Number:
- SC0020294; PHYS1360278; PHY-0918526; SC0018141
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 7; 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; Plasma material interactions; Laser induced fluorescence; Particle-in-cell method; Speed of sound; Plasma sheaths; Magnetic fields; Fluid mechanics; Charge exchange reactions; Tokamaks; Elastic scattering
Citation Formats
Thompson, Derek S., Khaziev, Rinat, Fortney-Henriquez, Miguel, Keniley, Shane, Scime, Earl E., and Curreli, Davide. Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field. United States: N. p., 2020.
Web. doi:10.1063/5.0012442.
Thompson, Derek S., Khaziev, Rinat, Fortney-Henriquez, Miguel, Keniley, Shane, Scime, Earl E., & Curreli, Davide. Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field. United States. https://doi.org/10.1063/5.0012442
Thompson, Derek S., Khaziev, Rinat, Fortney-Henriquez, Miguel, Keniley, Shane, Scime, Earl E., and Curreli, Davide. Mon .
"Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field". United States. https://doi.org/10.1063/5.0012442. https://www.osti.gov/servlets/purl/1755893.
@article{osti_1755893,
title = {Three-dimensional cross-field flows at the plasma-material interface in an oblique magnetic field},
author = {Thompson, Derek S. and Khaziev, Rinat and Fortney-Henriquez, Miguel and Keniley, Shane and Scime, Earl E. and Curreli, Davide},
abstractNote = {This article describes experimental evidence that the magnetic presheath is a fully three-dimensional structure modified by ion–neutral collisions. Velocity distributions of both ions and neutrals, obtained via laser-induced fluorescence, show that cross field ion drifts do not result from entrainment of ions in a flowing neutral background. Ion flows parallel to E x B arise and accelerate to as much as 0.2cs within several ion gyroradii of the boundary surface, where cs is the sound speed. Within measurement resolution, the onset of the E x B aligned flow occurs at the same distance to the surface that ions begin to deflect from travel along magnetic field lines. Collisional fluid and particle-in-cell simulations of the boundary region are compared to the experimental measurements. We find that, in contrast to the classical collisionless Chodura model, collisional effects between the ions and the non-flowing neutral population are essential to quantitatively predict the observed ion drift velocities. No momentum coupling between ions and neutrals, separable from noise and other effects, is observed in either signal. Here, we discuss several explanations and implications of this observation.},
doi = {10.1063/5.0012442},
journal = {Physics of Plasmas},
number = 7,
volume = 27,
place = {United States},
year = {Mon Jul 20 00:00:00 EDT 2020},
month = {Mon Jul 20 00:00:00 EDT 2020}
}
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