Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque

D. J. Schlossberg; G. R. McKee; R. J. Fonck; K. H. Burrell; P. Gohil; R. J. Groebner; M. W. Shafer; W. M. Solomon; G. Wang

doi:10.1063/1.3192766

Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque

D. J. Schlossberg, G. R. McKee, R. J. Fonck, K. H. Burrell, P. Gohil, R. J. Groebner, M. W. Shafer, W. M. Solomon, G. Wang

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The power required to induce a bifurcation from a low-confinement mode to a high-confinement mode in DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas is found to depend sensitively on the injected neutral beam torque and consequent toroidal rotation. Plasmas exhibit a factor of 2-4 reduction in this power threshold, dependent on ion ∇B drift direction. Correlated with this change, turbulence velocity measurements near 0.9<r/a<1.0 for balanced injection demonstrate significantly larger poloidal flow shear at a given injection power, relative to cocurrent injection, facilitating the confinement transition.

Original language	English
Article number	080701
Journal	Physics of Plasmas
Volume	16
Issue number	8
DOIs	https://doi.org/10.1063/1.3192766
State	Published - 2009
Externally published	Yes

Funding

This research supported by the U.S. Department of Energy under Grant Nos. DE-FG02-89ER53296, DE-FC02-04ER54698, DE-AC02-76CH03073, and DE-FG03-01ER54615. The authors thank the DIII-D program for its support of these experiments and the fluctuation diagnostic development work.

Funders	Funder number
U.S. Department of Energy	DE-FG03-01ER54615, DE-AC02-76CH03073, DE-FC02-04ER54698, DE-FG02-89ER53296

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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abstract = "The power required to induce a bifurcation from a low-confinement mode to a high-confinement mode in DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas is found to depend sensitively on the injected neutral beam torque and consequent toroidal rotation. Plasmas exhibit a factor of 2-4 reduction in this power threshold, dependent on ion ∇B drift direction. Correlated with this change, turbulence velocity measurements near 0.9",

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AU - McKee, G. R.

AU - Fonck, R. J.

AU - Burrell, K. H.

AU - Gohil, P.

AU - Groebner, R. J.

AU - Shafer, M. W.

AU - Solomon, W. M.

AU - Wang, G.

PY - 2009

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AB - The power required to induce a bifurcation from a low-confinement mode to a high-confinement mode in DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasmas is found to depend sensitively on the injected neutral beam torque and consequent toroidal rotation. Plasmas exhibit a factor of 2-4 reduction in this power threshold, dependent on ion ∇B drift direction. Correlated with this change, turbulence velocity measurements near 0.9

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ER -

Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque

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