Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary

T. E. Evans; R. A. Moyer; J. G. Watkins; P. R. Thomas; T. H. Osborne; J. A. Boedo; M. E. Fenstermacher; K. H. Finken; R. J. Groebner; M. Groth; J. Harris; G. L. Jackson; R. J. La Haye; C. J. Lasnier; M. J. Schaffer; G. Wang; L. Zeng

doi:10.1016/j.jnucmat.2004.10.062

Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary

T. E. Evans^*, R. A. Moyer, J. G. Watkins, P. R. Thomas, T. H. Osborne, J. A. Boedo, M. E. Fenstermacher, K. H. Finken, R. J. Groebner, M. Groth, J. Harris, G. L. Jackson, R. J. La Haye, C. J. Lasnier, M. J. Schaffer, G. Wang, L. Zeng

^*Corresponding author for this work

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

63 Citations (Scopus)

Abstract

Large 70 Hz Type-I edge localized modes (ELMs) are converted into small 130 Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents ≤0.4% I_p in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss ΔE_ELM/Δt^1/2 to the scrape-of layer is reduced a factor of ≥20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.

Original language	English
Pages (from-to)	691-696
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	337-339
Issue number	1-3 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2004.10.062
Publication status	Published - 1 Mar 2005

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Evans, T. E., Moyer, R. A., Watkins, J. G., Thomas, P. R., Osborne, T. H., Boedo, J. A., Fenstermacher, M. E., Finken, K. H., Groebner, R. J., Groth, M., Harris, J., Jackson, G. L., La Haye, R. J., Lasnier, C. J., Schaffer, M. J., Wang, G., & Zeng, L. (2005). Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary. Journal of Nuclear Materials, 337-339(1-3 SPEC. ISS.), 691-696. https://doi.org/10.1016/j.jnucmat.2004.10.062

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title = "Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary",

abstract = "Large 70 Hz Type-I edge localized modes (ELMs) are converted into small 130 Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents ≤0.4% Ip in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss ΔEELM/Δt1/2 to the scrape-of layer is reduced a factor of ≥20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.",

keywords = "DIII-D, Divertor, ELM control, Edge pedestal, Stochastic boundary",

author = "Evans, {T. E.} and Moyer, {R. A.} and Watkins, {J. G.} and Thomas, {P. R.} and Osborne, {T. H.} and Boedo, {J. A.} and Fenstermacher, {M. E.} and Finken, {K. H.} and Groebner, {R. J.} and M. Groth and J. Harris and Jackson, {G. L.} and {La Haye}, {R. J.} and Lasnier, {C. J.} and Schaffer, {M. J.} and G. Wang and L. Zeng",

year = "2005",

month = mar,

day = "1",

doi = "10.1016/j.jnucmat.2004.10.062",

language = "English",

volume = "337-339",

pages = "691--696",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "1-3 SPEC. ISS.",

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Evans, TE, Moyer, RA, Watkins, JG, Thomas, PR, Osborne, TH, Boedo, JA, Fenstermacher, ME, Finken, KH, Groebner, RJ, Groth, M, Harris, J, Jackson, GL, La Haye, RJ, Lasnier, CJ, Schaffer, MJ, Wang, G & Zeng, L 2005, 'Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary', Journal of Nuclear Materials, vol. 337-339, no. 1-3 SPEC. ISS., pp. 691-696. https://doi.org/10.1016/j.jnucmat.2004.10.062

TY - JOUR

T1 - Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary

AU - Evans, T. E.

AU - Moyer, R. A.

AU - Watkins, J. G.

AU - Thomas, P. R.

AU - Osborne, T. H.

AU - Boedo, J. A.

AU - Fenstermacher, M. E.

AU - Finken, K. H.

AU - Groebner, R. J.

AU - Groth, M.

AU - Harris, J.

AU - Jackson, G. L.

AU - La Haye, R. J.

AU - Lasnier, C. J.

AU - Schaffer, M. J.

AU - Wang, G.

AU - Zeng, L.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - Large 70 Hz Type-I edge localized modes (ELMs) are converted into small 130 Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents ≤0.4% Ip in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss ΔEELM/Δt1/2 to the scrape-of layer is reduced a factor of ≥20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.

AB - Large 70 Hz Type-I edge localized modes (ELMs) are converted into small 130 Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents ≤0.4% Ip in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss ΔEELM/Δt1/2 to the scrape-of layer is reduced a factor of ≥20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.

KW - DIII-D

KW - Divertor

KW - ELM control

KW - Edge pedestal

KW - Stochastic boundary

UR - http://www.scopus.com/inward/record.url?scp=13844318557&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2004.10.062

DO - 10.1016/j.jnucmat.2004.10.062

M3 - Article

SN - 0022-3115

VL - 337-339

SP - 691

EP - 696

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3 SPEC. ISS.

ER -

Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary

Abstract

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