Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas

Rice, J. E.; Gao, C.; Mumgaard, R.; Parker, R. R.; Scott, S. D.; Shiraiwa, S.; Wallace, G. M.; Bonoli, P. T.; Delgado-Aparicio, L.; Fenzi, C.; Granetz, R. S.; Greenwald, M. J.; Hubbard, A. E.; Hughes, J. W.; Irby, J. H.; Lee, J. P.; Marmar, E. S.; Reinke, M. L.; Wolfe, S. M.

doi:10.1088/0029-5515/56/3/036015

Title: Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas

Journal Article · Tue Feb 09 00:00:00 EST 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/56/3/036015· OSTI ID:1319213

Rice, J. E. ^[1]; Gao, C. ^[1]; Mumgaard, R. ^[1]; Parker, R. R. ^[1]; Scott, S. D. ^[2]; Shiraiwa, S. ^[1]; Wallace, G. M. ^[1]; Bonoli, P. T. ^[1]; Delgado-Aparicio, L. ^[2]; Fenzi, C. ^[3]; Granetz, R. S. ^[1]; Greenwald, M. J. ^[1]; Hubbard, A. E. ^[1]; Hughes, J. W. ^[1]; Irby, J. H. ^[1]; Lee, J. P. ^[1]; Marmar, E. S. ^[1]; Reinke, M. L. ^[4]; Wolfe, S. M. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
CEA, IRFM, St. Paul-lez-Durance (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Changes in the core toroidal rotation profiles following injection of lower hybrid (LH) waves have been documented in Alcator C-Mod plasmas. Shot by shot scans of LH input power have been performed at fixed magnetic field and electron density for several plasma currents. For sawtoothing target plasmas, if the input power is low enough that the central safety factor q₀ remains below 1, the change in the core rotation is in the counter-current direction, consistent in sign, magnitude and LH power scaling with direct momentum input from the LH waves. If the power level is high enough that there are significant changes to the q profile, including the termination of sawtooth oscillations, the change in the toroidal rotation is in the co-current direction, consistent with changes in the momentum flux through its dependence on the current density profile. Furthermore, the direction of the rotation changes depends on whether q₀ is below or above unity, and seemingly not on the magnetic shear, nor the Ohmic confinement regime of the target plasma.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1319213

Journal Information:: Nuclear Fusion, Vol. 56, Issue 3; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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