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Title: Momentum flux parasitic to free-energy transfer

An often-neglected portion of the radial $$\boldsymbol{E}\times \boldsymbol{B}$$ drift is shown to drive an outward flux of co-current momentum when free energy is transferred from the electrostatic potential to ion parallel flows. This symmetry breaking is fully nonlinear, not quasilinear, necessitated simply by free-energy balance in parameter regimes for which significant energy is dissipated via ion parallel flows. The resulting rotation peaking is counter-current and has a scaling and order of magnitude that are comparable with experimental observations. Finally, the residual stress becomes inactive when frequencies are much higher than the ion transit frequency, which may explain the observed relation of density peaking and counter-current rotation peaking in the core.
Authors:
 [1] ;  [2]
  1. Princeton Univ., NJ (United States)
  2. Max-Planck-Inst. fur Plasmaphysik, Garching (Germany)
Publication Date:
Report Number(s):
PPPL-5329
Journal ID: ISSN 0029-5515; TRN: US1802264
Grant/Contract Number:
AC02-09CH11466
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; toroidal rotation; tokamak; intrinsic rotation; rotation reversal; transport
OSTI Identifier:
1426203

Stoltzfus-Dueck, T., and Scott, B.. Momentum flux parasitic to free-energy transfer. United States: N. p., Web. doi:10.1088/1741-4326/aa7289.
Stoltzfus-Dueck, T., & Scott, B.. Momentum flux parasitic to free-energy transfer. United States. doi:10.1088/1741-4326/aa7289.
Stoltzfus-Dueck, T., and Scott, B.. 2017. "Momentum flux parasitic to free-energy transfer". United States. doi:10.1088/1741-4326/aa7289. https://www.osti.gov/servlets/purl/1426203.
@article{osti_1426203,
title = {Momentum flux parasitic to free-energy transfer},
author = {Stoltzfus-Dueck, T. and Scott, B.},
abstractNote = {An often-neglected portion of the radial $\boldsymbol{E}\times \boldsymbol{B}$ drift is shown to drive an outward flux of co-current momentum when free energy is transferred from the electrostatic potential to ion parallel flows. This symmetry breaking is fully nonlinear, not quasilinear, necessitated simply by free-energy balance in parameter regimes for which significant energy is dissipated via ion parallel flows. The resulting rotation peaking is counter-current and has a scaling and order of magnitude that are comparable with experimental observations. Finally, the residual stress becomes inactive when frequencies are much higher than the ion transit frequency, which may explain the observed relation of density peaking and counter-current rotation peaking in the core.},
doi = {10.1088/1741-4326/aa7289},
journal = {Nuclear Fusion},
number = 8,
volume = 57,
place = {United States},
year = {2017},
month = {5}
}