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Plasma Physics Controlled Fusion
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 and the ASDEX Upgrade and MAST Teams
  2005
  DOI
 
Resumo
 
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.

 

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