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.

Access to Document

10.1063/1.3192766

Cite this

@article{dd0906ca303641d3ad76e1bbf794cd4f,

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

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",

author = "Schlossberg, \{D. J.\} and McKee, \{G. R.\} and Fonck, \{R. J.\} and Burrell, \{K. H.\} and P. Gohil and Groebner, \{R. J.\} and Shafer, \{M. W.\} and Solomon, \{W. M.\} and G. Wang",

year = "2009",

doi = "10.1063/1.3192766",

language = "English",

volume = "16",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "8",

}

TY - JOUR

T1 - Dependence of the low to high confinement mode transition power threshold and turbulence flow shear on injected torque

AU - Schlossberg, D. J.

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

Y1 - 2009

N2 - 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

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

UR - https://www.scopus.com/pages/publications/69849089609

U2 - 10.1063/1.3192766

DO - 10.1063/1.3192766

M3 - Article

AN - SCOPUS:69849089609

SN - 1070-664X

VL - 16

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 8

M1 - 080701

ER -

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

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this