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

JET-EFDA collaborators

Research output: Contribution to journalArticleScientificpeer-review

56 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number105007
Number of pages19
JournalPlasma Physics and Controlled Fusion
Volume52
Issue number10
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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braking
Braking
torque
Torque
perturbation
Plasmas
Viscosity
viscosity
beam injection
neutral beams
field strength
Momentum
Magnetic fields
momentum
profiles
magnetic fields

Cite this

@article{0e0db3aa51de43aeadfcc0521af59131,
title = "Toroidal rotation braking with n = 1 magnetic perturbation field on JET",
abstract = "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.",
author = "Y. Sun and Y. Liang and H.R. Koslowski and S. Jachmich and A. Alfier and O. Asunta and G. Corrigan and C. Giroud and M.P. Gryanznevich and D. Harting and T. Hender and E. Nardon and V. Naulin and V. Parail and Tuomas Tala and C. Wiegmann and S. Wiesen and {JET-EFDA collaborators}",
year = "2010",
doi = "10.1088/0741-3335/52/10/105007",
language = "English",
volume = "52",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
publisher = "Institute of Physics IOP",
number = "10",

}

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

In: Plasma Physics and Controlled Fusion, Vol. 52, No. 10, 105007, 2010.

Research output: Contribution to journalArticleScientificpeer-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 -