5.1.2 Mobilization of Dust Particles from Plasma-Facing
Components
Although postmortem analysis shows a significant amount of dust particles on the
plasma-facing components virtually in all magnetic fusion devices, it is obvious that
not all the dust ends up in the plasma at once. The mobilization of the dust particles
from the plasma-facing components is complex and is still the topic of ongoing
research. Different mechanisms can be responsible for dust mobilization from the
plasma-facing components: the plasma-induced drag force and dust collisions with
Fig. 5.9 SEM image of dust particles (with a size range of 50–100 μm) collected from Alcator
C-Mod. The energy-dispersive X-ray spectroscopy (EDX) mapping provides the composition of the
dust grains. (Reproduced with permission from [16], © Elseiver 2017)
0.0
0.5
0
0
1000
2000
3000
1
1
2
2
200
400
600
800
c
C
w
W
Ni
W Mo
keV
keV
O
O
Be N
(b)
(a)
Fig. 5.10 (a) Agglomerated dust particle, (b) EDX spectra from regions 1 and 2. (Reproduced with
permission from [31], © Elseiver 2017)
5.1 Experimental Study of Dust in Magnetic Fusion Devices
95