Modeling of dust impact on tokamak edge plasmas

Techniques for injection of pre-characterized dust into the scrape-off layer of fusion plasma

“…This constitutes approximately 5.0 × 10 −6 Li spheres, a number far too large to track with cameras successfully. Also, large amounts of dust have been predicted to affect the edge parameters [9]. This has been verified in recent Li experiments on NSTX and will be the topic of a future publication.…”

Transient impurity events in JET with the new ITER-like wall

“…The dust observed by HRTS after a disruption and the TIEs seen during plasma operation could therefore be the same dust particles, but visualized in two different manners. This suggest that the dust initially present in the machine before the first plasma (or generated before JP N = 81000 for the TIE database) has been slowly eroded, or ablated when interacting with the hot plasma [12], or transported to remote, inaccessible areas of the machine. The occurrence of TIEs could be then understood in the following way: when entering the plasma core, the dust particles will ablate and lose part of its mass which will be then re-deposited in other regions of the machine.…”

Modeling of Tungsten Dust Transport in ITER with Multi‐Physics Code DUSTT/UEDGE

“…The multi-physics code DUSTT/UEDGE has been developed [4], [2] that self-consistently couples two physics components: (i) the DUSTT code [6], [7], which simulates the 3-D dust particle transport and statistically averaged profiles of dust parameters and associated impurity particle sources in plasma; and (ii) the UEDGE code [8], which simulates the 2-D multi-species multi-fluid transport of plasma and impurities in the boundary region of tokamaks. The data flow between the codes, which represents an explicit coupling scheme, is schematically shown in Fig.…”

“…Our reference calculations are done for the source of the dust at the dump plate and for R d = 100 μm and U d = 10 m/s (which are from the range of radii and velocities expected in the case when dust is liberated due to blistering, cracking and grain ejection as well as in the dust injection experiments planned on current fusion devices). The shielding factor γ sh = 10 is used to account for the reduction of plasma fluxes on dust due to ablation cloud, which is based on model validation against NSTX experiments [4], [12].…”