Further Rotation Reversal Studies in C-Mod L-mode Plasmas
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Author(s)
Rice, John E.
Cao, N.M.
Diamond, P.H.
Greenwald, M.J.
Hubbard, Amanda E.
Marmar, E.S.
Reinke, M.L.
Rodriguez-Fernandez, P.
Date Issued
May 2023
Journal
Physics of Plasmas
Publisher
AIP
Abstract
Studies of core toroidal rotation reversal phenomenology in C-Mod deuterium L-mode plasmas have been expanded to include details of the dependences on plasma current and toroidal magnetic field. Rotation reversal occurs at a critical density and universal scaling indicates that the product of n_crit q_95 R ~ B_T/2, with n_crit in 10^20/m^3, R in m and B_T in T. Measurements in H and He plasmas exhibit similar behavior, including a connexion with the LOC/SOC transition and the cut-off for non-diffusive heat transport. Electron density and ICRF power modulation experiments suggest that the collisionality nu_* is a unifying parameter. Strong impurity puffing causes the critical density to increase, indicating that the situation is more complicated than only collisionality, perhaps involving the details of the effects of dilution on ITG mode stability.
Description
Submitted for publication in Physics of Plasmas
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0159632
