Post-mortem and in-situ investigations of magnetic dust in ASDEX Upgrade
NUCLEAR MATERIALS AND ENERGY(2023)
Abstract
Pre-plasma mobilization of magnetic dust can be an important issue for future fusion reactors where plasma breakdown is critical. A combined on-line and off-line study of magnetic dust in ASDEX Upgrade is reported. Post-mortem collection revealed similar composition and morphology compared to other tokamaks, but the overall amount was much smaller. Optical and IR camera diagnostics excluded dust flybys prior to plasma start-up. The negative detection is discussed in light of the magnetic dust properties, the strength of mobilizing forces and the temporal evolution of the magnetic field.
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Key words
Magnetic dust,Mobilization,Dust in tokamaks,ASDEX Upgrade
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