Further rotation reversal studies in C-Mod L-mode plasmas

Rice, J. E.; Cao, N. M.; Diamond, P. H.; Greenwald, M. J.; Hubbard, A. E.; Marmar, E. S.; Reinke, M. L.; Rodriguez-Fernandez, P.

doi:10.1063/5.0159632

Title: Further rotation reversal studies in C-Mod L-mode plasmas

Journal Article · 31 July 2023 · Physics of Plasmas

DOI: https://doi.org/10.1063/5.0159632 · OSTI ID:2420339

^[1];

; Diamond, P. H.;

;

; Marmar, E. S.; Reinke, M. L.;

OSTI

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 ncritq95R ∼ BT/2, with ncrit in 1020/m3, R in m, and BT in T. Measurements in H and He plasmas exhibit similar behavior, including a connection with the linear Ohmic confinement/saturated Ohmic confinement transition and the cutoff for non-diffusive heat transport. Electron density and ion cyclotron range of frequencies power modulation experiments suggest that the collisionality ν* 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 ion temperature gradient mode stability.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014264

OSTI ID:: 2420339

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 30; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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