Active control of type-I edge localized modes on JET

Y. Liang; H. R. Koslowski; P. R. Thomas; E. Nardon; S. Jachmich; B. Alper; P. Andrew; Y. Andrew; G. Arnoux; Y. Baranov; M. Bécoulet; M. Beurskens; T. Biewer; M. Bigi; K. Crombe; E. De La Luna; P. De Vries; T. Eich; H. G. Esser; W. Fundamenski; S. Gerasimov; C. Giroud; M. P. Gryaznevich; D. Harting; N. Hawkes; S. Hotchin; D. Howell; A. Huber; M. Jakubowski; V. Kiptily; A. Kreter; L. Moreira; V. Parail; S. D. Pinches; E. Rachlew; O. Schmitz; O. Zimmermann

doi:10.1088/0741-3335/49/12B/S54

Active control of type-I edge localized modes on JET

Y. Liang
, H. R. Koslowski
, P. R. Thomas
, E. Nardon
, S. Jachmich
, B. Alper
, P. Andrew
, Y. Andrew
, G. Arnoux
, Y. Baranov
, M. Bécoulet
, M. Beurskens
, T. Biewer
, M. Bigi
, K. Crombe
, E. De La Luna
, P. De Vries
, T. Eich
, H. G. Esser
, W. Fundamenski

S. Gerasimov, C. Giroud, M. P. Gryaznevich, D. Harting, N. Hawkes, S. Hotchin, D. Howell, A. Huber, M. Jakubowski, V. Kiptily, A. Kreter, L. Moreira, V. Parail, S. D. Pinches, E. Rachlew, O. Schmitz, O. Zimmermann

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

62 Scopus citations

Abstract

The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q₉₅ varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6% to below the noise level of the diamagnetic measurement (<2%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q₉₅ but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q₉₅ from 4.5 to 3.1 has been found.

Original language	English
Pages (from-to)	B581-B589
Journal	Plasma Physics and Controlled Fusion
Volume	49
Issue number	12 B
DOIs	https://doi.org/10.1088/0741-3335/49/12B/S54
State	Published - Dec 1 2007

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10.1088/0741-3335/49/12B/S54

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Liang, Y., Koslowski, H. R., Thomas, P. R., Nardon, E., Jachmich, S., Alper, B., Andrew, P., Andrew, Y., Arnoux, G., Baranov, Y., Bécoulet, M., Beurskens, M., Biewer, T., Bigi, M., Crombe, K., De La Luna, E., De Vries, P., Eich, T., Esser, H. G., ... Zimmermann, O. (2007). Active control of type-I edge localized modes on JET. Plasma Physics and Controlled Fusion, 49(12 B), B581-B589. https://doi.org/10.1088/0741-3335/49/12B/S54

@article{bc774fa3594d49caacf581f4510e4ab0,

title = "Active control of type-I edge localized modes on JET",

abstract = "The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q95 varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6\% to below the noise level of the diamagnetic measurement (<2\%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q95 but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q95 from 4.5 to 3.1 has been found.",

author = "Y. Liang and Koslowski, \{H. R.\} and Thomas, \{P. R.\} and E. Nardon and S. Jachmich and B. Alper and P. Andrew and Y. Andrew and G. Arnoux and Y. Baranov and M. B{\'e}coulet and M. Beurskens and T. Biewer and M. Bigi and K. Crombe and \{De La Luna\}, E. and \{De Vries\}, P. and T. Eich and Esser, \{H. G.\} and W. Fundamenski and S. Gerasimov and C. Giroud and Gryaznevich, \{M. P.\} and D. Harting and N. Hawkes and S. Hotchin and D. Howell and A. Huber and M. Jakubowski and V. Kiptily and A. Kreter and L. Moreira and V. Parail and Pinches, \{S. D.\} and E. Rachlew and O. Schmitz and O. Zimmermann",

year = "2007",

month = dec,

day = "1",

doi = "10.1088/0741-3335/49/12B/S54",

language = "English",

volume = "49",

pages = "B581--B589",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

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}

Liang, Y, Koslowski, HR, Thomas, PR, Nardon, E, Jachmich, S, Alper, B, Andrew, P, Andrew, Y, Arnoux, G, Baranov, Y, Bécoulet, M, Beurskens, M, Biewer, T, Bigi, M, Crombe, K, De La Luna, E, De Vries, P, Eich, T, Esser, HG, Fundamenski, W, Gerasimov, S, Giroud, C, Gryaznevich, MP, Harting, D, Hawkes, N, Hotchin, S, Howell, D, Huber, A, Jakubowski, M, Kiptily, V, Kreter, A, Moreira, L, Parail, V, Pinches, SD, Rachlew, E, Schmitz, O & Zimmermann, O 2007, 'Active control of type-I edge localized modes on JET', Plasma Physics and Controlled Fusion, vol. 49, no. 12 B, pp. B581-B589. https://doi.org/10.1088/0741-3335/49/12B/S54

TY - JOUR

T1 - Active control of type-I edge localized modes on JET

AU - Liang, Y.

AU - Koslowski, H. R.

AU - Thomas, P. R.

AU - Nardon, E.

AU - Jachmich, S.

AU - Alper, B.

AU - Andrew, P.

AU - Andrew, Y.

AU - Arnoux, G.

AU - Baranov, Y.

AU - Bécoulet, M.

AU - Beurskens, M.

AU - Biewer, T.

AU - Bigi, M.

AU - Crombe, K.

AU - De La Luna, E.

AU - De Vries, P.

AU - Eich, T.

AU - Esser, H. G.

AU - Fundamenski, W.

AU - Gerasimov, S.

AU - Giroud, C.

AU - Gryaznevich, M. P.

AU - Harting, D.

AU - Hawkes, N.

AU - Hotchin, S.

AU - Howell, D.

AU - Huber, A.

AU - Jakubowski, M.

AU - Kiptily, V.

AU - Kreter, A.

AU - Moreira, L.

AU - Parail, V.

AU - Pinches, S. D.

AU - Rachlew, E.

AU - Schmitz, O.

AU - Zimmermann, O.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q95 varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6% to below the noise level of the diamagnetic measurement (<2%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q95 but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q95 from 4.5 to 3.1 has been found.

AB - The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q95 varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6% to below the noise level of the diamagnetic measurement (<2%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q95 but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q95 from 4.5 to 3.1 has been found.

UR - https://www.scopus.com/pages/publications/36348988366

U2 - 10.1088/0741-3335/49/12B/S54

DO - 10.1088/0741-3335/49/12B/S54

M3 - Article

AN - SCOPUS:36348988366

SN - 0741-3335

VL - 49

SP - B581-B589

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 12 B

ER -

Active control of type-I edge localized modes on JET

Abstract

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