Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak

E. J. Synakowski; S. H. Batha; M. A. Beer; M. G. Bell; R. E. Bell; R. V. Budny; C. E. Bush; P. C. Efthimion; G. W. Hammett; T. S. Hahm; B. LeBlanc; B. Levinton; E. Mazzucato; H. Park; A. T. Ramsey; G. Rewoldt; S. D. Scott; G. Schmidt; W. M. Tang; G. Taylor; M. C. Zarnstorff

doi:10.1103/PhysRevLett.78.2972

Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak

E. J. Synakowski, S. H. Batha, M. A. Beer, M. G. Bell, R. E. Bell, R. V. Budny, C. E. Bush, P. C. Efthimion, G. W. Hammett, T. S. Hahm, B. LeBlanc, B. Levinton, E. Mazzucato, H. Park, A. T. Ramsey, G. Rewoldt, S. D. Scott, G. Schmidt, W. M. Tang, G. TaylorM. C. Zarnstorff

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

109 Scopus citations

Abstract

The relaxation of core transport barriers in TFTR enhanced reversed shear plasmas has been studied by varying the radial electric field using different applied torques from neutral beam injection. Transport rates and fluctuations remain low over a wide range of radial electric field shear, but increase when the local E×B shearing rates are driven below a threshold comparable to the fastest linear growth rates of the dominant instabilities. Shafranov-shift-induced stabilization alone is not able to sustain enhanced confinement.

Original language	English (US)
Pages (from-to)	2972-2975
Number of pages	4
Journal	Physical Review Letters
Volume	78
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.78.2972
State	Published - Apr 14 1997
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.78.2972

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Synakowski, E. J., Batha, S. H., Beer, M. A., Bell, M. G., Bell, R. E., Budny, R. V., Bush, C. E., Efthimion, P. C., Hammett, G. W., Hahm, T. S., LeBlanc, B., Levinton, B., Mazzucato, E., Park, H., Ramsey, A. T., Rewoldt, G., Scott, S. D., Schmidt, G., Tang, W. M., ... Zarnstorff, M. C. (1997). Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak. Physical Review Letters, 78(15), 2972-2975. https://doi.org/10.1103/PhysRevLett.78.2972

Synakowski, EJ, Batha, SH, Beer, MA, Bell, MG, Bell, RE, Budny, RV, Bush, CE, Efthimion, PC, Hammett, GW, Hahm, TS, LeBlanc, B, Levinton, B, Mazzucato, E, Park, H, Ramsey, AT, Rewoldt, G, Scott, SD, Schmidt, G, Tang, WM, Taylor, G & Zarnstorff, MC 1997, 'Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak', Physical Review Letters, vol. 78, no. 15, pp. 2972-2975. https://doi.org/10.1103/PhysRevLett.78.2972

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title = "Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak",

abstract = "The relaxation of core transport barriers in TFTR enhanced reversed shear plasmas has been studied by varying the radial electric field using different applied torques from neutral beam injection. Transport rates and fluctuations remain low over a wide range of radial electric field shear, but increase when the local E×B shearing rates are driven below a threshold comparable to the fastest linear growth rates of the dominant instabilities. Shafranov-shift-induced stabilization alone is not able to sustain enhanced confinement.",

author = "Synakowski, {E. J.} and Batha, {S. H.} and Beer, {M. A.} and Bell, {M. G.} and Bell, {R. E.} and Budny, {R. V.} and Bush, {C. E.} and Efthimion, {P. C.} and Hammett, {G. W.} and Hahm, {T. S.} and B. LeBlanc and B. Levinton and E. Mazzucato and H. Park and Ramsey, {A. T.} and G. Rewoldt and Scott, {S. D.} and G. Schmidt and Tang, {W. M.} and G. Taylor and Zarnstorff, {M. C.}",

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T1 - Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak

AU - Synakowski, E. J.

AU - Batha, S. H.

AU - Beer, M. A.

AU - Bell, M. G.

AU - Bell, R. E.

AU - Budny, R. V.

AU - Bush, C. E.

AU - Efthimion, P. C.

AU - Hammett, G. W.

AU - Hahm, T. S.

AU - LeBlanc, B.

AU - Levinton, B.

AU - Mazzucato, E.

AU - Park, H.

AU - Ramsey, A. T.

AU - Rewoldt, G.

AU - Scott, S. D.

AU - Schmidt, G.

AU - Tang, W. M.

AU - Taylor, G.

AU - Zarnstorff, M. C.

PY - 1997/4/14

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AB - The relaxation of core transport barriers in TFTR enhanced reversed shear plasmas has been studied by varying the radial electric field using different applied torques from neutral beam injection. Transport rates and fluctuations remain low over a wide range of radial electric field shear, but increase when the local E×B shearing rates are driven below a threshold comparable to the fastest linear growth rates of the dominant instabilities. Shafranov-shift-induced stabilization alone is not able to sustain enhanced confinement.

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Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak

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