Heat transport at the boundary of ASDEX Upgrade
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 in 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.
Bibliographic Reference: Report: IPP 1/295 EN (1997) 16pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199710359 / Last updated on: 1997-04-14
Original language: en
Available languages: en