Diffusion and stochastic heating of a dust cloud in tokamak edge plasmas

Marmolino, C.; Bacharis, M.; Allen, J. E.; de Angelis, U.; Willis, C.
October 2011
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103706
Academic Journal
The diffusion due to collisions with ions of a cloud of nano-meter dust particles in the region of the scrape-off-layer (SOL) of a tokamak is considered and it is shown that for the conditions in the Frascati tokamak upgrade, the cloud can expand to reach the SOL limit in very short times without ablating. The conditions for stochastic heating of the cloud and acceleration of a larger particle to hyper-velocities, taking into account the effect of decreasing dust density in the cloud, are established.


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