Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak

Y. Liang; C. G. Gimblett; P. K. Browning; P. Devoy; A. Alfier; G. Calabrò; C. Giroud; D. Harting; H. R. Koslowski; S. Jachmich; J. Pearson; Y. Sun; C. Wiegmann; T. Zhang

doi:10.1088/0029-5515/51/7/073001

Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak

Y. Liang, C. G. Gimblett, P. K. Browning, P. Devoy, A. Alfier, G. Calabrò, C. Giroud, D. Harting, H. R. Koslowski, S. Jachmich, J. Pearson, Y. Sun, C. Wiegmann, T. Zhang

Laboratory for Plasma Physics

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

Abstract

Multiple resonances of the edge-localized mode (ELM) frequency caused by the application of low n (=1 or 2) magnetic perturbations for ELM control have been observed on JET. With a low n field applied, a strong increase in ELM frequency, f_ELM, by a factor of ∼4.5 was found in many separated narrow windows of q₉₅ (resonant q₉₅), while the f _ELM increased only by a factor of ∼2 for non-resonant q ₉₅ values. The fractions of increase in f_ELM with different resonant q₉₅ values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and f_ELM depend on the amplitude of the normalized edge current density as well as the edge safety factor, q_a.

Original language	English
Article number	073001
Journal	Nuclear Fusion
Volume	51
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/51/7/073001
Publication status	Published - Jul 2011

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Liang, Y., Gimblett, C. G., Browning, P. K., Devoy, P., Alfier, A., Calabrò, G., Giroud, C., Harting, D., Koslowski, H. R., Jachmich, S., Pearson, J., Sun, Y., Wiegmann, C., & Zhang, T. (2011). Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak. Nuclear Fusion, 51(7), Article 073001. https://doi.org/10.1088/0029-5515/51/7/073001

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title = "Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak",

abstract = "Multiple resonances of the edge-localized mode (ELM) frequency caused by the application of low n (=1 or 2) magnetic perturbations for ELM control have been observed on JET. With a low n field applied, a strong increase in ELM frequency, fELM, by a factor of ∼4.5 was found in many separated narrow windows of q95 (resonant q95), while the f ELM increased only by a factor of ∼2 for non-resonant q 95 values. The fractions of increase in fELM with different resonant q95 values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and fELM depend on the amplitude of the normalized edge current density as well as the edge safety factor, qa.",

author = "Y. Liang and Gimblett, {C. G.} and Browning, {P. K.} and P. Devoy and A. Alfier and G. Calabr{\`o} and C. Giroud and D. Harting and Koslowski, {H. R.} and S. Jachmich and J. Pearson and Y. Sun and C. Wiegmann and T. Zhang",

year = "2011",

month = jul,

doi = "10.1088/0029-5515/51/7/073001",

language = "English",

volume = "51",

journal = "Nuclear Fusion",

issn = "0029-5515",

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T1 - Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak

AU - Liang, Y.

AU - Gimblett, C. G.

AU - Browning, P. K.

AU - Devoy, P.

AU - Alfier, A.

AU - Calabrò, G.

AU - Giroud, C.

AU - Harting, D.

AU - Koslowski, H. R.

AU - Jachmich, S.

AU - Pearson, J.

AU - Sun, Y.

AU - Wiegmann, C.

AU - Zhang, T.

PY - 2011/7

Y1 - 2011/7

N2 - Multiple resonances of the edge-localized mode (ELM) frequency caused by the application of low n (=1 or 2) magnetic perturbations for ELM control have been observed on JET. With a low n field applied, a strong increase in ELM frequency, fELM, by a factor of ∼4.5 was found in many separated narrow windows of q95 (resonant q95), while the f ELM increased only by a factor of ∼2 for non-resonant q 95 values. The fractions of increase in fELM with different resonant q95 values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and fELM depend on the amplitude of the normalized edge current density as well as the edge safety factor, qa.

AB - Multiple resonances of the edge-localized mode (ELM) frequency caused by the application of low n (=1 or 2) magnetic perturbations for ELM control have been observed on JET. With a low n field applied, a strong increase in ELM frequency, fELM, by a factor of ∼4.5 was found in many separated narrow windows of q95 (resonant q95), while the f ELM increased only by a factor of ∼2 for non-resonant q 95 values. The fractions of increase in fELM with different resonant q95 values are not the same. An analysis of ideal external peeling modes shows that both the dominant unstable peeling mode number and fELM depend on the amplitude of the normalized edge current density as well as the edge safety factor, qa.

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U2 - 10.1088/0029-5515/51/7/073001

DO - 10.1088/0029-5515/51/7/073001

M3 - Article

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SN - 0029-5515

VL - 51

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 7

M1 - 073001

ER -

Observations of multi-resonance effect in ELM control with magnetic perturbation fields on the JET tokamak

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