Anisotropy-driven collisional separation of impurities in magnetized compressing and expanding cylindrical plasmas
Abstract
When a cylindrically-symmetric magnetized plasma compresses or expands, velocity-space anisotropy is naturally generated as a result of the different adiabatic conservation laws parallel and perpendicular to the magneticfield. When the compression timescale is comparable to the collision timescale, and both are much longer than the gyroperiod, this pressure anisotropy can become significant. We show that this naturally generated anisotropy can dramatically affect the transport of impurities in the compressing plasma, even in the absence of scalar temperature or density gradients, by modifying the azimuthal frictions that give rise to radial particle transport. Although the impurity transport direction depends only on the sign of the pressure anisotropy, the anisotropy itself depends on the pitch magnitude of the magnetic field and the sign of the radial velocity. Thus, pressure anisotropy effects can drive impurities either towards or away from the plasma core. These anisotropy-dependent terms represent a qualitatively new effect, influencing transport particularly in the sparse edge regions of dynamically-compressing screw pinch plasmas. Such plasmas are used for both X-ray generation and magneto-inertial fusion, applications which are sensitive to impurity concentrations.
- Authors:
-
[1];
[1]
- Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Cornell Univ., Ithaca, NY (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1511434
- Alternate Identifier(s):
- OSTI ID: 1526269
- Grant/Contract Number:
- AC02-09CH11466; PHY-1506122; FG02-97ER25308; NA0003764
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 12; 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
Citation Formats
Ochs, I. E., and Fisch, N. J. Anisotropy-driven collisional separation of impurities in magnetized compressing and expanding cylindrical plasmas. United States: N. p., 2018.
Web. doi:10.1063/1.5055568.
Ochs, I. E., & Fisch, N. J. Anisotropy-driven collisional separation of impurities in magnetized compressing and expanding cylindrical plasmas. United States. https://doi.org/10.1063/1.5055568
Ochs, I. E., and Fisch, N. J. Fri .
"Anisotropy-driven collisional separation of impurities in magnetized compressing and expanding cylindrical plasmas". United States. https://doi.org/10.1063/1.5055568. https://www.osti.gov/servlets/purl/1511434.
@article{osti_1511434,
title = {Anisotropy-driven collisional separation of impurities in magnetized compressing and expanding cylindrical plasmas},
author = {Ochs, I. E. and Fisch, N. J.},
abstractNote = {When a cylindrically-symmetric magnetized plasma compresses or expands, velocity-space anisotropy is naturally generated as a result of the different adiabatic conservation laws parallel and perpendicular to the magneticfield. When the compression timescale is comparable to the collision timescale, and both are much longer than the gyroperiod, this pressure anisotropy can become significant. We show that this naturally generated anisotropy can dramatically affect the transport of impurities in the compressing plasma, even in the absence of scalar temperature or density gradients, by modifying the azimuthal frictions that give rise to radial particle transport. Although the impurity transport direction depends only on the sign of the pressure anisotropy, the anisotropy itself depends on the pitch magnitude of the magnetic field and the sign of the radial velocity. Thus, pressure anisotropy effects can drive impurities either towards or away from the plasma core. These anisotropy-dependent terms represent a qualitatively new effect, influencing transport particularly in the sparse edge regions of dynamically-compressing screw pinch plasmas. Such plasmas are used for both X-ray generation and magneto-inertial fusion, applications which are sensitive to impurity concentrations.},
doi = {10.1063/1.5055568},
journal = {Physics of Plasmas},
number = 12,
volume = 25,
place = {United States},
year = {Fri Dec 14 00:00:00 EST 2018},
month = {Fri Dec 14 00:00:00 EST 2018}
}
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