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The flow of heat in the scrape-off layer (SOL) region of ASDEX Upgrade is investigated and compared with simple modelling. Parallel heat transport is found to be consistent with electron heat conduction based on Spitzer-Härm conductivity. Cross-field heat transport is characterized using radial e-folding distances for power, temperature and plasma pressure, which are all found to vary weakly over a wide range of discharge conditions. Type I edge-localized modes (ELM), also characterized, introduce a discreteness to the power flow into the SOL and carry approximately half of the power exhaust from the discharge. The divertor plates are effectively screened from the ELM energy, even in low-radiation discharges, suggesting enhanced radiation rates during ELMs.

Additional information

Authors: PITCHER C S, MIT Plasma Science and Fusion Center, Cambridge (US);HERRMANN A ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, vol. 39 (1997) No. 7, 1129-1144
Record Number: 199711269 / Last updated on: 1997-10-10
Original language: en
Available languages: en