On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas

J. M. Canik; R. Maingi; T. E. Evans; R. E. Bell; S. P. Gerhardt; B. P. Leblanc; J. Manickam; J. E. Menard; T. H. Osborne; J. K. Park; S. F. Paul; P. B. Snyder; S. A. Sabbagh; H. W. Kugel; E. A. Unterberg

doi:10.1103/PhysRevLett.104.045001

On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas

J. M. Canik, R. Maingi, T. E. Evans, R. E. Bell, S. P. Gerhardt, B. P. Leblanc, J. Manickam, J. E. Menard, T. H. Osborne, J. K. Park, S. F. Paul, P. B. Snyder, S. A. Sabbagh, H. W. Kugel, E. A. Unterberg

Fusion Energy Division

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75 Scopus citations

Abstract

The application of nonaxisymmetric magnetic fields is shown to destabilize edge-localized modes (ELMs) during otherwise ELM-free periods of discharges in the National Spherical Torus Experiment (NSTX). Profile analysis shows the applied fields increased the temperature and pressure gradients, decreasing edge stability. This robust effect was exploited for a new form of ELM control: the triggering of ELMs at will in high performance H mode plasmas enabled by lithium conditioning, yielding high time-averaged energy confinement with reduced core impurity density and radiated power.

Original language	English
Article number	045001
Journal	Physical Review Letters
Volume	104
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.104.045001
State	Published - Jan 26 2010

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Canik, J. M., Maingi, R., Evans, T. E., Bell, R. E., Gerhardt, S. P., Leblanc, B. P., Manickam, J., Menard, J. E., Osborne, T. H., Park, J. K., Paul, S. F., Snyder, P. B., Sabbagh, S. A., Kugel, H. W., & Unterberg, E. A. (2010). On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas. Physical Review Letters, 104(4), Article 045001. https://doi.org/10.1103/PhysRevLett.104.045001

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title = "On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas",

abstract = "The application of nonaxisymmetric magnetic fields is shown to destabilize edge-localized modes (ELMs) during otherwise ELM-free periods of discharges in the National Spherical Torus Experiment (NSTX). Profile analysis shows the applied fields increased the temperature and pressure gradients, decreasing edge stability. This robust effect was exploited for a new form of ELM control: the triggering of ELMs at will in high performance H mode plasmas enabled by lithium conditioning, yielding high time-averaged energy confinement with reduced core impurity density and radiated power.",

author = "Canik, {J. M.} and R. Maingi and Evans, {T. E.} and Bell, {R. E.} and Gerhardt, {S. P.} and Leblanc, {B. P.} and J. Manickam and Menard, {J. E.} and Osborne, {T. H.} and Park, {J. K.} and Paul, {S. F.} and Snyder, {P. B.} and Sabbagh, {S. A.} and Kugel, {H. W.} and Unterberg, {E. A.}",

year = "2010",

month = jan,

day = "26",

doi = "10.1103/PhysRevLett.104.045001",

language = "English",

volume = "104",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Canik, JM, Maingi, R, Evans, TE, Bell, RE, Gerhardt, SP, Leblanc, BP, Manickam, J, Menard, JE, Osborne, TH, Park, JK, Paul, SF, Snyder, PB, Sabbagh, SA, Kugel, HW & Unterberg, EA 2010, 'On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas', Physical Review Letters, vol. 104, no. 4, 045001. https://doi.org/10.1103/PhysRevLett.104.045001

TY - JOUR

T1 - On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas

AU - Canik, J. M.

AU - Maingi, R.

AU - Evans, T. E.

AU - Bell, R. E.

AU - Gerhardt, S. P.

AU - Leblanc, B. P.

AU - Manickam, J.

AU - Menard, J. E.

AU - Osborne, T. H.

AU - Park, J. K.

AU - Paul, S. F.

AU - Snyder, P. B.

AU - Sabbagh, S. A.

AU - Kugel, H. W.

AU - Unterberg, E. A.

PY - 2010/1/26

Y1 - 2010/1/26

N2 - The application of nonaxisymmetric magnetic fields is shown to destabilize edge-localized modes (ELMs) during otherwise ELM-free periods of discharges in the National Spherical Torus Experiment (NSTX). Profile analysis shows the applied fields increased the temperature and pressure gradients, decreasing edge stability. This robust effect was exploited for a new form of ELM control: the triggering of ELMs at will in high performance H mode plasmas enabled by lithium conditioning, yielding high time-averaged energy confinement with reduced core impurity density and radiated power.

AB - The application of nonaxisymmetric magnetic fields is shown to destabilize edge-localized modes (ELMs) during otherwise ELM-free periods of discharges in the National Spherical Torus Experiment (NSTX). Profile analysis shows the applied fields increased the temperature and pressure gradients, decreasing edge stability. This robust effect was exploited for a new form of ELM control: the triggering of ELMs at will in high performance H mode plasmas enabled by lithium conditioning, yielding high time-averaged energy confinement with reduced core impurity density and radiated power.

UR - http://www.scopus.com/inward/record.url?scp=75749090034&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.104.045001

DO - 10.1103/PhysRevLett.104.045001

M3 - Article

AN - SCOPUS:75749090034

SN - 0031-9007

VL - 104

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 045001

ER -

On demand triggering of Edge localized instabilities using external nonaxisymmetric magnetic perturbations in toroidal plasmas

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