Transport with reversed shear in the National Spherical Torus Experiment

F. M. Levinton; H. Yuh; M. G. Bell; R. E. Bell; L. Delgado-Aparicio; M. Finkenthal; E. D. Fredrickson; D. A. Gates; S. M. Kaye; B. P. LeBlanc; R. Maingi; J. E. Menard; D. Mikkelsen; D. Mueller; R. Raman; G. Rewoldt; S. A. Sabbagh; D. Stutman; K. Tritz; W. Wang

doi:10.1063/1.2734124

Transport with reversed shear in the National Spherical Torus Experiment

F. M. Levinton^*, H. Yuh, M. G. Bell, R. E. Bell, L. Delgado-Aparicio, M. Finkenthal, E. D. Fredrickson, D. A. Gates, S. M. Kaye, B. P. LeBlanc, R. Maingi, J. E. Menard, D. Mikkelsen, D. Mueller, R. Raman, G. Rewoldt, S. A. Sabbagh, D. Stutman, K. Tritz, W. Wang

^*Corresponding author for this work

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

42 Scopus citations

Abstract

In the National Spherical Torus Experiment (NSTX) [M. Ono, Nucl. Fusion 40, 557 (2000)], plasmas with strongly reversed magnetic shear, s(rq)(dqdr)<0, in the plasma core exhibit a marked improvement in electron confinement compared to otherwise similar plasmas with positive or only weakly reversed magnetic shear. The q profile itself is determined by the early evolution of the plasma current, the plasma cross section, and the neutral-beam heating power. In the region of shear reversal, the electron thermal diffusivity can be significantly reduced. Detailed experimental investigation of this phenomenon has been made possible by the successful development of a motional Stark effect (MSE) polarimetry diagnostic suitable for the low magnetic field in NSTX, typically 0.35-0.55 T. Measurements of the electron and ion temperature, density, and plasma toroidal rotation profiles are also available with high spatial and temporal resolution for analysis of the plasma transport properties.

Original language	English
Article number	056119
Journal	Physics of Plasmas
Volume	14
Issue number	5
DOIs	https://doi.org/10.1063/1.2734124
State	Published - 2007
Externally published	Yes

UN SDGs

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

Access to Document

10.1063/1.2734124

Cite this

Levinton, F. M., Yuh, H., Bell, M. G., Bell, R. E., Delgado-Aparicio, L., Finkenthal, M., Fredrickson, E. D., Gates, D. A., Kaye, S. M., LeBlanc, B. P., Maingi, R., Menard, J. E., Mikkelsen, D., Mueller, D., Raman, R., Rewoldt, G., Sabbagh, S. A., Stutman, D., Tritz, K., & Wang, W. (2007). Transport with reversed shear in the National Spherical Torus Experiment. Physics of Plasmas, 14(5), Article 056119. https://doi.org/10.1063/1.2734124

@article{17d4aa2534c344b98043328b2fdeb6f6,

title = "Transport with reversed shear in the National Spherical Torus Experiment",

abstract = "In the National Spherical Torus Experiment (NSTX) [M. Ono, Nucl. Fusion 40, 557 (2000)], plasmas with strongly reversed magnetic shear, s(rq)(dqdr)<0, in the plasma core exhibit a marked improvement in electron confinement compared to otherwise similar plasmas with positive or only weakly reversed magnetic shear. The q profile itself is determined by the early evolution of the plasma current, the plasma cross section, and the neutral-beam heating power. In the region of shear reversal, the electron thermal diffusivity can be significantly reduced. Detailed experimental investigation of this phenomenon has been made possible by the successful development of a motional Stark effect (MSE) polarimetry diagnostic suitable for the low magnetic field in NSTX, typically 0.35-0.55 T. Measurements of the electron and ion temperature, density, and plasma toroidal rotation profiles are also available with high spatial and temporal resolution for analysis of the plasma transport properties.",

author = "Levinton, {F. M.} and H. Yuh and Bell, {M. G.} and Bell, {R. E.} and L. Delgado-Aparicio and M. Finkenthal and Fredrickson, {E. D.} and Gates, {D. A.} and Kaye, {S. M.} and LeBlanc, {B. P.} and R. Maingi and Menard, {J. E.} and D. Mikkelsen and D. Mueller and R. Raman and G. Rewoldt and Sabbagh, {S. A.} and D. Stutman and K. Tritz and W. Wang",

year = "2007",

doi = "10.1063/1.2734124",

language = "אנגלית",

volume = "14",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

Levinton, FM, Yuh, H, Bell, MG, Bell, RE, Delgado-Aparicio, L, Finkenthal, M, Fredrickson, ED, Gates, DA, Kaye, SM, LeBlanc, BP, Maingi, R, Menard, JE, Mikkelsen, D, Mueller, D, Raman, R, Rewoldt, G, Sabbagh, SA, Stutman, D, Tritz, K & Wang, W 2007, 'Transport with reversed shear in the National Spherical Torus Experiment', Physics of Plasmas, vol. 14, no. 5, 056119. https://doi.org/10.1063/1.2734124

TY - JOUR

T1 - Transport with reversed shear in the National Spherical Torus Experiment

AU - Levinton, F. M.

AU - Yuh, H.

AU - Bell, M. G.

AU - Bell, R. E.

AU - Delgado-Aparicio, L.

AU - Finkenthal, M.

AU - Fredrickson, E. D.

AU - Gates, D. A.

AU - Kaye, S. M.

AU - LeBlanc, B. P.

AU - Maingi, R.

AU - Menard, J. E.

AU - Mikkelsen, D.

AU - Mueller, D.

AU - Raman, R.

AU - Rewoldt, G.

AU - Sabbagh, S. A.

AU - Stutman, D.

AU - Tritz, K.

AU - Wang, W.

PY - 2007

Y1 - 2007

N2 - In the National Spherical Torus Experiment (NSTX) [M. Ono, Nucl. Fusion 40, 557 (2000)], plasmas with strongly reversed magnetic shear, s(rq)(dqdr)<0, in the plasma core exhibit a marked improvement in electron confinement compared to otherwise similar plasmas with positive or only weakly reversed magnetic shear. The q profile itself is determined by the early evolution of the plasma current, the plasma cross section, and the neutral-beam heating power. In the region of shear reversal, the electron thermal diffusivity can be significantly reduced. Detailed experimental investigation of this phenomenon has been made possible by the successful development of a motional Stark effect (MSE) polarimetry diagnostic suitable for the low magnetic field in NSTX, typically 0.35-0.55 T. Measurements of the electron and ion temperature, density, and plasma toroidal rotation profiles are also available with high spatial and temporal resolution for analysis of the plasma transport properties.

AB - In the National Spherical Torus Experiment (NSTX) [M. Ono, Nucl. Fusion 40, 557 (2000)], plasmas with strongly reversed magnetic shear, s(rq)(dqdr)<0, in the plasma core exhibit a marked improvement in electron confinement compared to otherwise similar plasmas with positive or only weakly reversed magnetic shear. The q profile itself is determined by the early evolution of the plasma current, the plasma cross section, and the neutral-beam heating power. In the region of shear reversal, the electron thermal diffusivity can be significantly reduced. Detailed experimental investigation of this phenomenon has been made possible by the successful development of a motional Stark effect (MSE) polarimetry diagnostic suitable for the low magnetic field in NSTX, typically 0.35-0.55 T. Measurements of the electron and ion temperature, density, and plasma toroidal rotation profiles are also available with high spatial and temporal resolution for analysis of the plasma transport properties.

UR - http://www.scopus.com/inward/record.url?scp=34249878460&partnerID=8YFLogxK

U2 - 10.1063/1.2734124

DO - 10.1063/1.2734124

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:34249878460

SN - 1070-664X

VL - 14

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056119

ER -

Transport with reversed shear in the National Spherical Torus Experiment

Abstract

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this