Journal
PLASMA PHYSICS AND CONTROLLED FUSION
Volume 59, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6587/aa7c44
Keywords
dust; droplets; dust heating; magnetized electron collection; thin-sheath ions
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Funding
- Euratom research and training programme [633053]
- Swedish Research Council
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A comprehensive analytical description is presented for the particle and heat fluxes collected by dust in dense magnetized plasmas. Compared to the widely used orbital motion limited theory, the suppression of cross-field transport leads to a strong reduction of the electron fluxes, while ion collection is inhibited by thin-sheath effects and the formation of a potential overshoot along the field lines. As a result, the incoming heat flux loses its sensitivity to the floating potential, thereby diminishing the importance of electron emission processes in dust survivability. Numerical simulations implementing the new model for ITER-like detached divertor plasmas predict a drastic enhancement of the dust lifetime.
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