Effect of misaligned edges and magnetic field orientation on plasma deposition into gaps during ELMs on ITER

0352655 - ÚFP 2012 RIV NL eng J - Journal Article
Dejarnac, Renaud - Komm, Michael - Gunn, J. P. - Pekarek, Z.
Effect of misaligned edges and magnetic field orientation on plasma deposition into gaps during ELMs on ITER.
Journal of Nuclear Materials. Roč. 415, č. 1 (2011), S977-S980. ISSN 0022-3115. E-ISSN 1873-4820.
[International Conference on Plasma-Surface Interactions in Controlled Fusion (PSI19)/19th./. San Diego, 24.05.2010-28.05.2010]
Institutional research plan: CEZ:AV0Z20430508
Keywords : Edge modeling * Plasma-wall interactions * ITER * Sheaths * ELMs
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 2.052, year: 2011
http://www.sciencedirect.com/science/article/pii/S0022311510005520

In tokamaks, where possible in areas of high conducted heat flux flowing parallel to magnetic field lines (for example in the divertor strike point vicinity), surfaces are oriented with glancing angles to the magnetic field in order to spread the power over the widest possible area. As a consequence of grazing angles, any protruding edges on these surfaces (due for example to mechanical misalignment) can lead to serious power overload and therefore to rapid damage. Using particle-in-cell simulations, power fluxes impinging on the gaps between misaligned edges due to Edge Localised Mode transients have been evaluated and are presented in this paper. The results of the computations show that the power deposited to the protruding edges is lower than the one expected without taking into account particle orbits. Particle fluxes inside a gap are also investigated as a function of the field line orientation with respect to the gap direction.
Permanent Link: http://hdl.handle.net/11104/0192120