Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade

F. Sommer; S. Günter; A. Kallenbach; M. Maraschek; J.E. Boom; R. Fischer; N. Hicks; N.C. Luhmann; H.K. Park; B. Reiter; R. Wenninger; E. Wolfrum

doi:10.1088/0741-3335/53/8/085012

Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade

F. Sommer, S. Günter, A. Kallenbach, M. Maraschek, J.E. Boom, R. Fischer, N. Hicks, N.C. Luhmann, H.K. Park, B. Reiter, R. Wenninger, E. Wolfrum

Science and Technology of Nuclear Fusion

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Abstract

A new magnetohydrodynamic instability called the 'Edge Snake', which was found in 2006 at the tokamak ASDEX Upgrade during type-I ELMy H-modes, is investigated. It is located within the separatrix in the region of high temperature and density gradients and has a toroidal mode number of n = 1. The Edge Snake consists of a radially and poloidally strongly localized current wire, in which the temperature and density profiles flatten. This significant reduction in pressure gradient leads to a reduction in the neoclassical Bootstrap current and can plausibly explain the drive of the instability. The experimental observations point towards a magnetic island with a defect current inside the O-point of the island. The Edge Snake is compared with similar instabilities at JET, DIII-D and ASDEX Upgrade.

Original language	English
Article number	085012
Pages (from-to)	085012-1/13
Number of pages	13
Journal	Plasma Physics and Controlled Fusion
Volume	53
Issue number	8
DOIs	https://doi.org/10.1088/0741-3335/53/8/085012
Publication status	Published - 2011

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Sommer, F., Günter, S., Kallenbach, A., Maraschek, M., Boom, J. E., Fischer, R., Hicks, N., Luhmann, N. C., Park, H. K., Reiter, B., Wenninger, R., & Wolfrum, E. (2011). Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade. Plasma Physics and Controlled Fusion, 53(8), 085012-1/13. Article 085012. https://doi.org/10.1088/0741-3335/53/8/085012

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title = "Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade",

abstract = "A new magnetohydrodynamic instability called the 'Edge Snake', which was found in 2006 at the tokamak ASDEX Upgrade during type-I ELMy H-modes, is investigated. It is located within the separatrix in the region of high temperature and density gradients and has a toroidal mode number of n = 1. The Edge Snake consists of a radially and poloidally strongly localized current wire, in which the temperature and density profiles flatten. This significant reduction in pressure gradient leads to a reduction in the neoclassical Bootstrap current and can plausibly explain the drive of the instability. The experimental observations point towards a magnetic island with a defect current inside the O-point of the island. The Edge Snake is compared with similar instabilities at JET, DIII-D and ASDEX Upgrade.",

author = "F. Sommer and S. G{\"u}nter and A. Kallenbach and M. Maraschek and J.E. Boom and R. Fischer and N. Hicks and N.C. Luhmann and H.K. Park and B. Reiter and R. Wenninger and E. Wolfrum",

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doi = "10.1088/0741-3335/53/8/085012",

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Sommer, F, Günter, S, Kallenbach, A, Maraschek, M, Boom, JE, Fischer, R, Hicks, N, Luhmann, NC, Park, HK, Reiter, B, Wenninger, R & Wolfrum, E 2011, 'Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade', Plasma Physics and Controlled Fusion, vol. 53, no. 8, 085012, pp. 085012-1/13. https://doi.org/10.1088/0741-3335/53/8/085012

TY - JOUR

T1 - Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade

AU - Sommer, F.

AU - Günter, S.

AU - Kallenbach, A.

AU - Maraschek, M.

AU - Boom, J.E.

AU - Fischer, R.

AU - Hicks, N.

AU - Luhmann, N.C.

AU - Park, H.K.

AU - Reiter, B.

AU - Wenninger, R.

AU - Wolfrum, E.

PY - 2011

Y1 - 2011

N2 - A new magnetohydrodynamic instability called the 'Edge Snake', which was found in 2006 at the tokamak ASDEX Upgrade during type-I ELMy H-modes, is investigated. It is located within the separatrix in the region of high temperature and density gradients and has a toroidal mode number of n = 1. The Edge Snake consists of a radially and poloidally strongly localized current wire, in which the temperature and density profiles flatten. This significant reduction in pressure gradient leads to a reduction in the neoclassical Bootstrap current and can plausibly explain the drive of the instability. The experimental observations point towards a magnetic island with a defect current inside the O-point of the island. The Edge Snake is compared with similar instabilities at JET, DIII-D and ASDEX Upgrade.

AB - A new magnetohydrodynamic instability called the 'Edge Snake', which was found in 2006 at the tokamak ASDEX Upgrade during type-I ELMy H-modes, is investigated. It is located within the separatrix in the region of high temperature and density gradients and has a toroidal mode number of n = 1. The Edge Snake consists of a radially and poloidally strongly localized current wire, in which the temperature and density profiles flatten. This significant reduction in pressure gradient leads to a reduction in the neoclassical Bootstrap current and can plausibly explain the drive of the instability. The experimental observations point towards a magnetic island with a defect current inside the O-point of the island. The Edge Snake is compared with similar instabilities at JET, DIII-D and ASDEX Upgrade.

U2 - 10.1088/0741-3335/53/8/085012

DO - 10.1088/0741-3335/53/8/085012

M3 - Article

SN - 0741-3335

VL - 53

SP - 085012-1/13

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 8

M1 - 085012

ER -

Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade

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