Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear

E. J. Strait; L. L. Lao; M. E. Mauel; B. W. Rice; T. S. Taylor; K. H. Burrell; M. S. Chu; E. A. Lazarus; T. H. Osborne; S. J. Thompson; A. D. Turnbull

doi:10.1103/PhysRevLett.75.4421

Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear

E. J. Strait, L. L. Lao, M. E. Mauel, B. W. Rice, T. S. Taylor, K. H. Burrell, M. S. Chu, E. A. Lazarus, T. H. Osborne, S. J. Thompson, A. D. Turnbull

Institute of Space and Plasma Sciences

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

532 Citations (Scopus)

Abstract

Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D H-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, N=aBI, up to 4 (%-m-T/MA), energy confinement are a factor of 3 better than L mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.

Original language	English
Pages (from-to)	4421-4424
Number of pages	4
Journal	Physical review letters
Volume	75
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.75.4421
Publication status	Published - 1995

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.75.4421

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title = "Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear",

abstract = "Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D H-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, N=aBI, up to 4 (%-m-T/MA), energy confinement are a factor of 3 better than L mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.",

author = "Strait, {E. J.} and Lao, {L. L.} and Mauel, {M. E.} and Rice, {B. W.} and Taylor, {T. S.} and Burrell, {K. H.} and Chu, {M. S.} and Lazarus, {E. A.} and Osborne, {T. H.} and Thompson, {S. J.} and Turnbull, {A. D.}",

year = "1995",

doi = "10.1103/PhysRevLett.75.4421",

language = "English",

volume = "75",

pages = "4421--4424",

journal = "Physical Review Letters",

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TY - JOUR

T1 - Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear

AU - Strait, E. J.

AU - Lao, L. L.

AU - Mauel, M. E.

AU - Rice, B. W.

AU - Taylor, T. S.

AU - Burrell, K. H.

AU - Chu, M. S.

AU - Lazarus, E. A.

AU - Osborne, T. H.

AU - Thompson, S. J.

AU - Turnbull, A. D.

PY - 1995

Y1 - 1995

N2 - Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D H-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, N=aBI, up to 4 (%-m-T/MA), energy confinement are a factor of 3 better than L mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.

AB - Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D H-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, N=aBI, up to 4 (%-m-T/MA), energy confinement are a factor of 3 better than L mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.

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Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear

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