This title appears in the Scientific Report :
2015
Please use the identifier:
http://dx.doi.org/10.1088/0741-3335/56/9/095028 in citations.
Please use the identifier: http://hdl.handle.net/2128/24501 in citations.
Erosion/re-deposition modeling in an ITER divertor-like high-density, low-temperature plasma beam
Erosion/re-deposition modeling in an ITER divertor-like high-density, low-temperature plasma beam
Transport of hydrocarbon impurities in a high-density (>1020 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 ty...
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Personal Name(s): | Swaaij, G A van (Corresponding author) |
---|---|
Kirschner, A. / Borodin, D. / Goedheer, W. J. / Bystrov, K. / Temmerman, G De | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Plasma physics and controlled fusion, 56 (2014) 9, S. 095028 - |
Imprint: |
Bristol
IOP Publ.
2014
|
DOI: |
10.1088/0741-3335/56/9/095028 |
Document Type: |
Journal Article |
Research Program: |
Plasma-Wall-Interaction |
Link: |
Restricted OpenAccess Restricted OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/24501 in citations.
Transport of hydrocarbon impurities in a high-density (>1020 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 Te = 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. |