Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D

P. A. Politzer; C. C. Petty; R. J. Jayakumar; T. C. Luce; M. R. Wade; J. C. DeBoo; J. R. Ferron; P. Gohil; C. T. Holcomb; A. W. Hyatt; J. Kinsey; R. J. La Haye; M. A. Makowski; T. W. Petrie

doi:10.1088/0029-5515/48/7/075001

Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D

P. A. Politzer, C. C. Petty, R. J. Jayakumar, T. C. Luce, M. R. Wade, J. C. DeBoo, J. R. Ferron, P. Gohil, C. T. Holcomb, A. W. Hyatt, J. Kinsey, R. J. La Haye, M. A. Makowski, T. W. Petrie

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Abstract

We report the results of the first experiments on the DIII-D tokamak to examine the dependence of the transport and stability characteristics of ITER hybrid scenario plasmas on the toroidal flow (or rotation) of the plasma. With the new DIII-D capability to independently vary the neutral beam torque and power, the central rotation has been reduced by as much as a factor of 4.6 compared with discharges with unidirectional beams. Although energy confinement decreases and the m/n = 3/2 NTM amplitude increases for low rotation speed, the fusion performance figure of merit, , still exceeds the value required on ITER for Q_fus = 10. These observations provide optimism about the projections of the hybrid scenario to low rotation plasmas in ITER, but they also indicate the need for a better understanding of the physics of toroidal rotation in order to project present-day results to future experiments.

Original language	English
Article number	075001
Journal	Nuclear Fusion
Volume	48
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/48/7/075001
State	Published - Jul 1 2008
Externally published	Yes

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Politzer, P. A., Petty, C. C., Jayakumar, R. J., Luce, T. C., Wade, M. R., DeBoo, J. C., Ferron, J. R., Gohil, P., Holcomb, C. T., Hyatt, A. W., Kinsey, J., La Haye, R. J., Makowski, M. A., & Petrie, T. W. (2008). Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D. Nuclear Fusion, 48(7), Article 075001. https://doi.org/10.1088/0029-5515/48/7/075001

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title = "Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D",

abstract = "We report the results of the first experiments on the DIII-D tokamak to examine the dependence of the transport and stability characteristics of ITER hybrid scenario plasmas on the toroidal flow (or rotation) of the plasma. With the new DIII-D capability to independently vary the neutral beam torque and power, the central rotation has been reduced by as much as a factor of 4.6 compared with discharges with unidirectional beams. Although energy confinement decreases and the m/n = 3/2 NTM amplitude increases for low rotation speed, the fusion performance figure of merit, , still exceeds the value required on ITER for Qfus = 10. These observations provide optimism about the projections of the hybrid scenario to low rotation plasmas in ITER, but they also indicate the need for a better understanding of the physics of toroidal rotation in order to project present-day results to future experiments.",

author = "Politzer, {P. A.} and Petty, {C. C.} and Jayakumar, {R. J.} and Luce, {T. C.} and Wade, {M. R.} and DeBoo, {J. C.} and Ferron, {J. R.} and P. Gohil and Holcomb, {C. T.} and Hyatt, {A. W.} and J. Kinsey and {La Haye}, {R. J.} and Makowski, {M. A.} and Petrie, {T. W.}",

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T1 - Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D

AU - Politzer, P. A.

AU - Petty, C. C.

AU - Jayakumar, R. J.

AU - Luce, T. C.

AU - Wade, M. R.

AU - DeBoo, J. C.

AU - Ferron, J. R.

AU - Gohil, P.

AU - Holcomb, C. T.

AU - Hyatt, A. W.

AU - Kinsey, J.

AU - La Haye, R. J.

AU - Makowski, M. A.

AU - Petrie, T. W.

PY - 2008/7/1

Y1 - 2008/7/1

N2 - We report the results of the first experiments on the DIII-D tokamak to examine the dependence of the transport and stability characteristics of ITER hybrid scenario plasmas on the toroidal flow (or rotation) of the plasma. With the new DIII-D capability to independently vary the neutral beam torque and power, the central rotation has been reduced by as much as a factor of 4.6 compared with discharges with unidirectional beams. Although energy confinement decreases and the m/n = 3/2 NTM amplitude increases for low rotation speed, the fusion performance figure of merit, , still exceeds the value required on ITER for Qfus = 10. These observations provide optimism about the projections of the hybrid scenario to low rotation plasmas in ITER, but they also indicate the need for a better understanding of the physics of toroidal rotation in order to project present-day results to future experiments.

AB - We report the results of the first experiments on the DIII-D tokamak to examine the dependence of the transport and stability characteristics of ITER hybrid scenario plasmas on the toroidal flow (or rotation) of the plasma. With the new DIII-D capability to independently vary the neutral beam torque and power, the central rotation has been reduced by as much as a factor of 4.6 compared with discharges with unidirectional beams. Although energy confinement decreases and the m/n = 3/2 NTM amplitude increases for low rotation speed, the fusion performance figure of merit, , still exceeds the value required on ITER for Qfus = 10. These observations provide optimism about the projections of the hybrid scenario to low rotation plasmas in ITER, but they also indicate the need for a better understanding of the physics of toroidal rotation in order to project present-day results to future experiments.

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JO - Nuclear Fusion

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Influence of toroidal rotation on transport and stability in hybrid scenario plasmas in DIII-D

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