Non-resonant magnetic braking on JET and TEXTOR

Y. Sun; Y. Liang; K.C. Shaing; Y.Q. Liu; H.R. Koslowski; S. Jachmich; B. Alper; A. Alfier; O. Asunta; P. Buratti; G. Corrigan; E. Delabie; C. Giroud; M.P. Gryaznevich; D. Harting; T. Hender; E. Nardon; V. Naulin; V. Parail; Tuomas Tala; C. Wiegmann; S. Wiesen; T. Zhang; JET-EFDA contributors

doi:10.1088/0029-5515/52/8/083007

Non-resonant magnetic braking on JET and TEXTOR

Y. Sun, Y. Liang, K.C. Shaing, Y.Q. Liu, H.R. Koslowski, S. Jachmich, B. Alper, A. Alfier, O. Asunta, P. Buratti, G. Corrigan, E. Delabie, C. Giroud, M.P. Gryaznevich, D. Harting, T. Hender, E. Nardon, V. Naulin, V. Parail, Tuomas TalaC. Wiegmann, S. Wiesen, T. Zhang, JET-EFDA contributors

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

34 Citations (Scopus)

Abstract

The non-resonant magnetic braking effect induced by a non-axisymmetric magnetic perturbation is investigated on JET and TEXTOR. The collisionality dependence of the torque induced by the n = 1, where n is the toroidal mode number, magnetic perturbation generated by the error field correction coils on JET is observed. The observed torque is located mainly in the plasma core (normalized radius ρ < 0.4) and increases with decreasing collisionality. The neoclassical toroidal plasma viscosity (NTV) torque in the collisionless regime is modelled using the numerical solution of the bounce-averaged drift kinetic equation. The calculated collisionality dependence of the NTV torque is in good agreement with the experimental observation on JET. The reason for this collisionality dependence is that the torque in the plasma core on JET mainly comes from the flux of the trapped electrons, which are still mainly in the 1/ν regime. The strongest NTV torque on JET is also located near the plasma core. The magnitude of the NTV torque strongly depends on the plasma response, which is also discussed in this paper. There is no obvious braking effect with n = 2 magnetic perturbation generated by the dynamic ergodic divertor on TEXTOR, which is consistent with the NTV modelling.

Original language	English
Article number	083007
Journal	Nuclear Fusion
Volume	52
Issue number	8
DOIs	https://doi.org/10.1088/0029-5515/52/8/083007
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

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Sun, Y., Liang, Y., Shaing, K. C., Liu, Y. Q., Koslowski, H. R., Jachmich, S., Alper, B., Alfier, A., Asunta, O., Buratti, P., Corrigan, G., Delabie, E., Giroud, C., Gryaznevich, M. P., Harting, D., Hender, T., Nardon, E., Naulin, V., Parail, V., ... contributors, JET-EFDA. (2012). Non-resonant magnetic braking on JET and TEXTOR. Nuclear Fusion, 52(8), [083007]. https://doi.org/10.1088/0029-5515/52/8/083007

Sun, Y. ; Liang, Y. ; Shaing, K.C. ; Liu, Y.Q. ; Koslowski, H.R. ; Jachmich, S. ; Alper, B. ; Alfier, A. ; Asunta, O. ; Buratti, P. ; Corrigan, G. ; Delabie, E. ; Giroud, C. ; Gryaznevich, M.P. ; Harting, D. ; Hender, T. ; Nardon, E. ; Naulin, V. ; Parail, V. ; Tala, Tuomas ; Wiegmann, C. ; Wiesen, S. ; Zhang, T. ; contributors, JET-EFDA. / Non-resonant magnetic braking on JET and TEXTOR. In: Nuclear Fusion. 2012 ; Vol. 52, No. 8.

@article{e91637e367af4ac08ac37062e3c35d0f,

title = "Non-resonant magnetic braking on JET and TEXTOR",

abstract = "The non-resonant magnetic braking effect induced by a non-axisymmetric magnetic perturbation is investigated on JET and TEXTOR. The collisionality dependence of the torque induced by the n = 1, where n is the toroidal mode number, magnetic perturbation generated by the error field correction coils on JET is observed. The observed torque is located mainly in the plasma core (normalized radius ρ < 0.4) and increases with decreasing collisionality. The neoclassical toroidal plasma viscosity (NTV) torque in the collisionless regime is modelled using the numerical solution of the bounce-averaged drift kinetic equation. The calculated collisionality dependence of the NTV torque is in good agreement with the experimental observation on JET. The reason for this collisionality dependence is that the torque in the plasma core on JET mainly comes from the flux of the trapped electrons, which are still mainly in the 1/ν regime. The strongest NTV torque on JET is also located near the plasma core. The magnitude of the NTV torque strongly depends on the plasma response, which is also discussed in this paper. There is no obvious braking effect with n = 2 magnetic perturbation generated by the dynamic ergodic divertor on TEXTOR, which is consistent with the NTV modelling.",

author = "Y. Sun and Y. Liang and K.C. Shaing and Y.Q. Liu and H.R. Koslowski and S. Jachmich and B. Alper and A. Alfier and O. Asunta and P. Buratti and G. Corrigan and E. Delabie and C. Giroud and M.P. Gryaznevich 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 T. Zhang and JET-EFDA contributors",

year = "2012",

doi = "10.1088/0029-5515/52/8/083007",

language = "English",

volume = "52",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "Institute of Physics IOP",

number = "8",

}

Sun, Y, Liang, Y, Shaing, KC, Liu, YQ, Koslowski, HR, Jachmich, S, Alper, B, Alfier, A, Asunta, O, Buratti, P, Corrigan, G, Delabie, E, Giroud, C, Gryaznevich, MP, Harting, D, Hender, T, Nardon, E, Naulin, V, Parail, V, Tala, T, Wiegmann, C, Wiesen, S, Zhang, T & contributors, JET-EFDA 2012, 'Non-resonant magnetic braking on JET and TEXTOR', Nuclear Fusion, vol. 52, no. 8, 083007. https://doi.org/10.1088/0029-5515/52/8/083007

Non-resonant magnetic braking on JET and TEXTOR. / Sun, Y.; Liang, Y.; Shaing, K.C.; Liu, Y.Q.; Koslowski, H.R.; Jachmich, S.; Alper, B.; Alfier, A.; Asunta, O.; Buratti, P.; Corrigan, G.; Delabie, E.; Giroud, C.; Gryaznevich, M.P.; Harting, D.; Hender, T.; Nardon, E.; Naulin, V.; Parail, V.; Tala, Tuomas; Wiegmann, C.; Wiesen, S.; Zhang, T.; contributors, JET-EFDA.

In: Nuclear Fusion, Vol. 52, No. 8, 083007, 2012.

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

TY - JOUR

T1 - Non-resonant magnetic braking on JET and TEXTOR

AU - Sun, Y.

AU - Liang, Y.

AU - Shaing, K.C.

AU - Liu, Y.Q.

AU - Koslowski, H.R.

AU - Jachmich, S.

AU - Alper, B.

AU - Alfier, A.

AU - Asunta, O.

AU - Buratti, P.

AU - Corrigan, G.

AU - Delabie, E.

AU - Giroud, C.

AU - Gryaznevich, 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 - Zhang, T.

AU - contributors, JET-EFDA

PY - 2012

Y1 - 2012

N2 - The non-resonant magnetic braking effect induced by a non-axisymmetric magnetic perturbation is investigated on JET and TEXTOR. The collisionality dependence of the torque induced by the n = 1, where n is the toroidal mode number, magnetic perturbation generated by the error field correction coils on JET is observed. The observed torque is located mainly in the plasma core (normalized radius ρ < 0.4) and increases with decreasing collisionality. The neoclassical toroidal plasma viscosity (NTV) torque in the collisionless regime is modelled using the numerical solution of the bounce-averaged drift kinetic equation. The calculated collisionality dependence of the NTV torque is in good agreement with the experimental observation on JET. The reason for this collisionality dependence is that the torque in the plasma core on JET mainly comes from the flux of the trapped electrons, which are still mainly in the 1/ν regime. The strongest NTV torque on JET is also located near the plasma core. The magnitude of the NTV torque strongly depends on the plasma response, which is also discussed in this paper. There is no obvious braking effect with n = 2 magnetic perturbation generated by the dynamic ergodic divertor on TEXTOR, which is consistent with the NTV modelling.

AB - The non-resonant magnetic braking effect induced by a non-axisymmetric magnetic perturbation is investigated on JET and TEXTOR. The collisionality dependence of the torque induced by the n = 1, where n is the toroidal mode number, magnetic perturbation generated by the error field correction coils on JET is observed. The observed torque is located mainly in the plasma core (normalized radius ρ < 0.4) and increases with decreasing collisionality. The neoclassical toroidal plasma viscosity (NTV) torque in the collisionless regime is modelled using the numerical solution of the bounce-averaged drift kinetic equation. The calculated collisionality dependence of the NTV torque is in good agreement with the experimental observation on JET. The reason for this collisionality dependence is that the torque in the plasma core on JET mainly comes from the flux of the trapped electrons, which are still mainly in the 1/ν regime. The strongest NTV torque on JET is also located near the plasma core. The magnitude of the NTV torque strongly depends on the plasma response, which is also discussed in this paper. There is no obvious braking effect with n = 2 magnetic perturbation generated by the dynamic ergodic divertor on TEXTOR, which is consistent with the NTV modelling.

U2 - 10.1088/0029-5515/52/8/083007

DO - 10.1088/0029-5515/52/8/083007

M3 - Article

VL - 52

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 8

M1 - 083007

ER -