### Abstract

*n*= 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the

*n*= 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.

Original language | English |
---|---|

Article number | 105007 |

Number of pages | 19 |

Journal | Plasma Physics and Controlled Fusion |

Volume | 52 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2010 |

MoE publication type | A1 Journal article-refereed |

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### Cite this

*n*= 1 magnetic perturbation field on JET.

*Plasma Physics and Controlled Fusion*,

*52*(10), [105007]. https://doi.org/10.1088/0741-3335/52/10/105007

}

*n*= 1 magnetic perturbation field on JET',

*Plasma Physics and Controlled Fusion*, vol. 52, no. 10, 105007. https://doi.org/10.1088/0741-3335/52/10/105007

**Toroidal rotation braking with n = 1 magnetic perturbation field on JET.** / JET-EFDA collaborators.

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

TY - JOUR

T1 - Toroidal rotation braking with n = 1 magnetic perturbation field on JET

AU - Sun, Y.

AU - Liang, Y.

AU - Koslowski, H.R.

AU - Jachmich, S.

AU - Alfier, A.

AU - Asunta, O.

AU - Corrigan, G.

AU - Giroud, C.

AU - Gryanznevich, M.P.

AU - Harting, D.

AU - Hender, T.

AU - Nardon, E.

AU - Naulin, V.

AU - Parail, V.

AU - Tala, Tuomas

AU - Wiegmann, C.

AU - Wiesen, S.

AU - JET-EFDA collaborators

PY - 2010

Y1 - 2010

N2 - A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.

AB - A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field on the JET tokamak. Calculation results from the momentum transport analysis show that the torque induced by the n = 1 perturbation field has a global profile. The maximal value of this torque is at the plasma core region (ρ < 0.4) and it is about half of the neutral beam injection torque. The calculation shows that the plasma is mainly in the ν-√ν regime in the plasma core, but it is close to the transition between the 1/ν and ν-√ν regimes. The neoclassical toroidal viscosity (NTV) torque in the 1/ν and ν-√ν regimes is calculated. The observed torque is of a magnitude in between that of the NTV torque in the 1/ν and ν-√ν regimes. The NTV torque in the ν-√ν regimes is enhanced using the Lagrangian variation of the magnetic field strength. However, it is still smaller than the observed torque by one order of magnitude.

U2 - 10.1088/0741-3335/52/10/105007

DO - 10.1088/0741-3335/52/10/105007

M3 - Article

VL - 52

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 10

M1 - 105007

ER -

*n*= 1 magnetic perturbation field on JET. Plasma Physics and Controlled Fusion. 2010;52(10). 105007. https://doi.org/10.1088/0741-3335/52/10/105007