Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1319213
- DOE Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 3; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; rotation; q profile; lower hybrid current drive; tokamak
Citation Formats
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., and Wolfe, S. M. Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas. United States: N. p., 2016.
Web. doi:10.1088/0029-5515/56/3/036015.
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. Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas. United States. https://doi.org/10.1088/0029-5515/56/3/036015
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., and Wolfe, S. M. 2016.
"Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas". United States. https://doi.org/10.1088/0029-5515/56/3/036015.
@article{osti_1319213,
title = {Effects of the q profile on toroidal rotation in Alcator C-Mod LHCD plasmas},
author = {Rice, J. E. and Gao, C. and Mumgaard, R. and Parker, R. R. and Scott, S. D. and Shiraiwa, S. and Wallace, G. M. and Bonoli, P. T. and Delgado-Aparicio, L. and Fenzi, C. and Granetz, R. S. and Greenwald, M. J. and Hubbard, A. E. and Hughes, J. W. and Irby, J. H. and Lee, J. P. and Marmar, E. S. and Reinke, M. L. and Wolfe, S. M.},
abstractNote = {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.},
doi = {10.1088/0029-5515/56/3/036015},
url = {https://www.osti.gov/biblio/1319213},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 3,
volume = 56,
place = {United States},
year = {Tue Feb 09 00:00:00 EST 2016},
month = {Tue Feb 09 00:00:00 EST 2016}
}
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