Erosion/re-deposition modeling in an ITER divertor-like high-density, low-temperature plasma beam

TitleErosion/re-deposition modeling in an ITER divertor-like high-density, low-temperature plasma beam
Publication TypeJournal Article
Year of Publication2014
AuthorsG.A van Swaaij, A. Kirschner, D. Borodin, W.J Goedheer, K. Bystrov, G. De Temmerman
JournalPlasma Physics and Controlled Fusion
Volume56
Issue9
Pagination095028
Abstract

Transport of hydrocarbon impurities in a high-density (>10 20 m−3), low-temperature (<2 eV) plasma beam was studied with the ERO code. The high ion density and low temperature cause strong Coulomb collisionality between plasma ions and impurity ions. The collisionality is so strong that ions typically do not complete their Larmor orbits. The high collisionality causes impurity entrainment: impurity ions quickly acquire a velocity close to the plasma flow velocity. This causes a relatively high surface impact energy: the calculated mean impact energy of CHx was 8.1 eV in a plasma with T e = 0.7 eV. Simulation results were compared to an a-C : H erosion experiment in the linear plasma generator Pilot-PSI. The large uncertainties in literature values for the sticking probability of hydrocarbon radicals are shown to cause a serious uncertainty in the calculated re-deposition pattern. In contrast, the radial electric field component perpendicular to the axial magnetic field lines did not have a major effect on the redeposition profile.

DOI10.1088/0741-3335/56/9/095028
Division

PSI

Department

CPP-LT

PID

8f0e0d97ef012d9be3662df4f14db8e7

Alternate TitlePlasma Phys. Control. Fusion
LabelOA
Attachment: 

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