Mechanisms for generating toroidal rotation in tokamaks without external momentum input

W.M. Solomon, K.H. Burrell, A.M. Garofalo, Tuomas Tala, S.M. Kaye, R.E. Bell, A.J. Cole, J.S. deGrassie, P.H. Diamond, T.S. Hahm, G.L. Jackson, M.J. Lanctot, C.C. Petty, H. Reimerdes, S.A. Sabbagh, E.J. Strait, R.E. Waltz

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Abstract

Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.
Original languageEnglish
Article number056108
JournalPhysics of Plasmas
Volume17
Issue number5
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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momentum
fusion
metal spinning
torque
pressure gradients
residual stress
angular momentum
scaling
physics
profiles
magnetic fields

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Solomon, W. M., Burrell, K. H., Garofalo, A. M., Tala, T., Kaye, S. M., Bell, R. E., ... Waltz, R. E. (2010). Mechanisms for generating toroidal rotation in tokamaks without external momentum input. Physics of Plasmas, 17(5), [056108]. https://doi.org/10.1063/1.3328521
Solomon, W.M. ; Burrell, K.H. ; Garofalo, A.M. ; Tala, Tuomas ; Kaye, S.M. ; Bell, R.E. ; Cole, A.J. ; deGrassie, J.S. ; Diamond, P.H. ; Hahm, T.S. ; Jackson, G.L. ; Lanctot, M.J. ; Petty, C.C. ; Reimerdes, H. ; Sabbagh, S.A. ; Strait, E.J. ; Waltz, R.E. / Mechanisms for generating toroidal rotation in tokamaks without external momentum input. In: Physics of Plasmas. 2010 ; Vol. 17, No. 5.
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abstract = "Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.",
author = "W.M. Solomon and K.H. Burrell and A.M. Garofalo and Tuomas Tala and S.M. Kaye and R.E. Bell and A.J. Cole and J.S. deGrassie and P.H. Diamond and T.S. Hahm and G.L. Jackson and M.J. Lanctot and C.C. Petty and H. Reimerdes and S.A. Sabbagh and E.J. Strait and R.E. Waltz",
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Solomon, WM, Burrell, KH, Garofalo, AM, Tala, T, Kaye, SM, Bell, RE, Cole, AJ, deGrassie, JS, Diamond, PH, Hahm, TS, Jackson, GL, Lanctot, MJ, Petty, CC, Reimerdes, H, Sabbagh, SA, Strait, EJ & Waltz, RE 2010, 'Mechanisms for generating toroidal rotation in tokamaks without external momentum input', Physics of Plasmas, vol. 17, no. 5, 056108. https://doi.org/10.1063/1.3328521

Mechanisms for generating toroidal rotation in tokamaks without external momentum input. / Solomon, W.M.; Burrell, K.H.; Garofalo, A.M.; Tala, Tuomas; Kaye, S.M.; Bell, R.E.; Cole, A.J.; deGrassie, J.S.; Diamond, P.H.; Hahm, T.S.; Jackson, G.L.; Lanctot, M.J.; Petty, C.C.; Reimerdes, H.; Sabbagh, S.A.; Strait, E.J.; Waltz, R.E.

In: Physics of Plasmas, Vol. 17, No. 5, 056108, 2010.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mechanisms for generating toroidal rotation in tokamaks without external momentum input

AU - Solomon, W.M.

AU - Burrell, K.H.

AU - Garofalo, A.M.

AU - Tala, Tuomas

AU - Kaye, S.M.

AU - Bell, R.E.

AU - Cole, A.J.

AU - deGrassie, J.S.

AU - Diamond, P.H.

AU - Hahm, T.S.

AU - Jackson, G.L.

AU - Lanctot, M.J.

AU - Petty, C.C.

AU - Reimerdes, H.

AU - Sabbagh, S.A.

AU - Strait, E.J.

AU - Waltz, R.E.

PY - 2010

Y1 - 2010

N2 - Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.

AB - Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.

U2 - 10.1063/1.3328521

DO - 10.1063/1.3328521

M3 - Article

VL - 17

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1527-2419

IS - 5

M1 - 056108

ER -