Speaker
Luke Simons
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.3007.pdf
Comparison of Dust Particle Trajectories in Magnum-PSI with
Simulations in DTOKS
L. Simons1 , M. Coppins1 ,
1 Imperial College, Blackett Laboratory, London SW7 2AZ United Kingdom
Conventially, plasma particles incident on a surface are recycled as they are neutralised,
ionised and redeposited. Future magnetic confinement devices such as ITER, and in particular
commercial facilities like DEMO, will require near loss-less redeposition on all plasma facing
surfaces to avoid prohibitively expensive maintenance. The release of micro-scale solid and liq-
uid particles known as dust from surfaces limits the effectiveness of recycling[1, 2] and causes
severe energy losses[3]. With safety limits on dust production in place for ITER, dust survivabil-
ity and transport are issues of critical importance for tokamak operation[4]. Comparison of dust
particle motion in experiments with theoretical models is vital to developing physical models.
Simulations performed by the dust tracking code
DTOKS[5, 6] using plasma data generated by
BOUT++[7] are compared to dust injection experi-
ments performed at the Magnum-PSI facility in the
Netherlands, see Figure 1. Arificial spherical tung-
sten spheres with diameters of 5µm and 9µm were
released into the hydrogen plasma and recorded by
a fast imaging Phantom and IR camera system from
two different planes, allowing their paths to be re-
Figure 1: Magnum PSI Design
constructed. The behaviour of dust grains in a non-
turbulent linear magnetic field is reviewed and the accuracy and applicability of the physical
models tested.
References
[1] J. Winter, Plasma Phys. Control. Fusion 46, B583 (2004).
[2] S.I. Krasheninnikov, R.D. Smirnov, and D.L. Rudakov, Plasma Phys. Control. Fusion 53, 83001 (2011).
[3] R.C. Isler, R. V. Neidigh, and R.D. Cowan, Phys. Lett. A 63, 295 (1977).
[4] J. Roth, et al., J. Nucl. Mater. 390-391, 1 (2009).
[5] J.D. Martin, M. Coppins, and G.F. Counsell, J. Nucl. Mater. 337-339, 114 (2005).
[6] M. Bacharis, M. Coppins, W. Fundamenski, and J.E. Allen, Plasma Phys. Control. Fusion 54, 85010 (2012).
[7] B.D. Dudson, et al., Comput. Phys. Commun. 180, 1467 (2009).
