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Return To: Session EX3 - Divertors 1 (Wednesday, 21 October)
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Next Page: (EX3/3) Detached Divertor Plasmas in ALCATOR C-Mod: A
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M. Kaufmann , H.-S. Bosch , A. Herrmann ,
A. Kallenbach , K. Borrass , A. Carlson , D. Coster ,
J. C. Fuchs , J. Gafert , K. Lackner , J. Neuhauser ,
R. Schneider , J. Schweinzer , W. Suttrop , W. Ullrich ,
U. Wenzel , and ASDEX Upgrade Team
Max-Planck-Institut für Plasmaphysik, EURATOM-IPP Association,
Garching und Berlin, Germany
Abstract
In 1997 the new `LYRA' divertor went
into operation at ASDEX Upgrade and the neutral beam heating power was
increased to 20 MW by installation of a second injector. This leads to the
relatively high value of P/R of 12 MW/m. It has been shown that the ASDEX
Upgrade LYRA divertor is capable of handling such high heating
powers. Measurements presented in this paper reveal a reduction of the
maximum heat flux in the LYRA divertor by more than a factor of two compared
to the open Divertor I. This reduction is caused by radiative losses inside
the divertor region . Carbon radiation cools the divertor plasma down to a few
eV where hydrogen radiation losses become significant. They are increased due
to an effective reflection of neutrals into the hot separatrix
region. B2-Eirene modelling of the performed experiments supports the
experimental findings and refines the understanding of loss processes in the
divertor region.
IAEA 1999