The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST

A. Kirk; T. Eich; A. Herrmann; H. W. Muller; L. D. Horton; G. F. Counsell; M. Price; V. Rohde; V. Bobkov; B. Kurzan; J. Neuhauser; H. Wilson

doi:10.1088/0741-3335/47/7/003

The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST

A. Kirk, T. Eich, A. Herrmann, H. W. Muller, L. D. Horton, G. F. Counsell, M. Price, V. Rohde, V. Bobkov, B. Kurzan, J. Neuhauser, H. Wilson

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Abstract

The radial extent and spatial structure of type-I edge localized modes (ELMs) in ASDEX Upgrade are investigated using data from a mid-plane manipulator equipped with Langmuir probes and a fast visible imaging camera and are compared to data from MAST. Plasmas with a range of toroidal magnetic fields have been studied. The radial extent of the ELM efflux is found to be largest at the smaller toroidal magnetic field. A study of a series of shots on ASDEX Upgrade with different plasma edge to wall separation suggests that the closeness of the wall does not have a stabilizing effect on the radial extent of the ELM. The data from the mid-plane manipulator and from visible imaging are consistent with non-linear ballooning mode theory, which predicts that the ELM has a filament like structure. On both devices these structures have a poloidal extent of 5-10 cm and a typical toroidal mode number of ∼15 and are found to accelerate away from the plasma edge. The acceleration is ∼3 times larger on MAST than on ASDEX Upgrade.

Original language	English
Pages (from-to)	995-1013
Number of pages	19
Journal	Plasma Physics and Controlled Fusion
Volume	47
Issue number	7
DOIs	https://doi.org/10.1088/0741-3335/47/7/003
State	Published - Jul 1 2005
Externally published	Yes

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title = "The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST",

abstract = "The radial extent and spatial structure of type-I edge localized modes (ELMs) in ASDEX Upgrade are investigated using data from a mid-plane manipulator equipped with Langmuir probes and a fast visible imaging camera and are compared to data from MAST. Plasmas with a range of toroidal magnetic fields have been studied. The radial extent of the ELM efflux is found to be largest at the smaller toroidal magnetic field. A study of a series of shots on ASDEX Upgrade with different plasma edge to wall separation suggests that the closeness of the wall does not have a stabilizing effect on the radial extent of the ELM. The data from the mid-plane manipulator and from visible imaging are consistent with non-linear ballooning mode theory, which predicts that the ELM has a filament like structure. On both devices these structures have a poloidal extent of 5-10 cm and a typical toroidal mode number of ∼15 and are found to accelerate away from the plasma edge. The acceleration is ∼3 times larger on MAST than on ASDEX Upgrade.",

author = "A. Kirk and T. Eich and A. Herrmann and Muller, {H. W.} and Horton, {L. D.} and Counsell, {G. F.} and M. Price and V. Rohde and V. Bobkov and B. Kurzan and J. Neuhauser and H. Wilson",

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T1 - The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST

AU - Kirk, A.

AU - Eich, T.

AU - Herrmann, A.

AU - Muller, H. W.

AU - Horton, L. D.

AU - Counsell, G. F.

AU - Price, M.

AU - Rohde, V.

AU - Bobkov, V.

AU - Kurzan, B.

AU - Neuhauser, J.

AU - Wilson, H.

PY - 2005/7/1

Y1 - 2005/7/1

N2 - The radial extent and spatial structure of type-I edge localized modes (ELMs) in ASDEX Upgrade are investigated using data from a mid-plane manipulator equipped with Langmuir probes and a fast visible imaging camera and are compared to data from MAST. Plasmas with a range of toroidal magnetic fields have been studied. The radial extent of the ELM efflux is found to be largest at the smaller toroidal magnetic field. A study of a series of shots on ASDEX Upgrade with different plasma edge to wall separation suggests that the closeness of the wall does not have a stabilizing effect on the radial extent of the ELM. The data from the mid-plane manipulator and from visible imaging are consistent with non-linear ballooning mode theory, which predicts that the ELM has a filament like structure. On both devices these structures have a poloidal extent of 5-10 cm and a typical toroidal mode number of ∼15 and are found to accelerate away from the plasma edge. The acceleration is ∼3 times larger on MAST than on ASDEX Upgrade.

AB - The radial extent and spatial structure of type-I edge localized modes (ELMs) in ASDEX Upgrade are investigated using data from a mid-plane manipulator equipped with Langmuir probes and a fast visible imaging camera and are compared to data from MAST. Plasmas with a range of toroidal magnetic fields have been studied. The radial extent of the ELM efflux is found to be largest at the smaller toroidal magnetic field. A study of a series of shots on ASDEX Upgrade with different plasma edge to wall separation suggests that the closeness of the wall does not have a stabilizing effect on the radial extent of the ELM. The data from the mid-plane manipulator and from visible imaging are consistent with non-linear ballooning mode theory, which predicts that the ELM has a filament like structure. On both devices these structures have a poloidal extent of 5-10 cm and a typical toroidal mode number of ∼15 and are found to accelerate away from the plasma edge. The acceleration is ∼3 times larger on MAST than on ASDEX Upgrade.

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The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST

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