Abstract
Type-I Edge-Localized Modes (ELMs) are events associated with H-mode tokamak operations during which about 10% of the plasma stored energy is released from the pedestal region. The largest fraction of this energy is deposited onto the divertor target tiles by parallel transport along the magnetic field lines. At JET, the spatial and temporal resolution of a new infrared (IR) thermography system monitoring the outer divertor target (1.7mm and 35–86μs, respectively) allows for an accurate study of the ELM induced nonaxisymmetric heat load patterns (Eich et al., 2003 [1]) refered to as striations. These striations can be linked to toroidal inhomogeneities at the outer midplane which have been observed on other devices such as ASDEX Upgrade, MAST and DIII-D. Here we report an analysis of these striations and their associated toroidal mode number, carried out on Type-I ELMy H-Mode plasmas with BT/IP in the range 1.5T-3.3T/1.5MA–2.5MA and NBI input power from 8 to 20MW.
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