Experience with bulk tungsten test-limiters under high heat loads: melting and melt layer propagation
2007 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T128, 81-86 p.Article in journal (Refereed) Published
The paper provides an overview of processes and underlying physics governing tungsten melt erosion in the fusion plasma environment. Experiments with three different bulk tungsten test-limiters were performed in TEXTOR: (i) thermally insulated solid plate fixed on a graphite roof-like limiter heated up by the plasma to the melting point, (ii) macro-brush of the ITER-relevant castellated structure and (iii) lamellae structure developed for the JET divertor. The main objectives were to determine the metal surface damage, the formation of the melt layer and its motion in the magnetic field. PHEMOBRID-3D and MEMOS-1.5D numerical codes were used to simulate the experiment with the roof-like test-limiter. Both experiments and simulation showed that the melting of tungsten can lead to a large material redistribution due to thermo-electron emission currents without ejection of molten material to the plasma.
Place, publisher, year, edition, pages
2007. Vol. T128, 81-86 p.
textor tokamak, erosion, armor, events
IdentifiersURN: urn:nbn:se:kth:diva-16657DOI: 10.1088/0031-8949/2007/T128/016ISI: 000246790200017ScopusID: 2-s2.0-42249098547OAI: oai:DiVA.org:kth-16657DiVA: diva2:334699
Conference: 11th International Workshop on Plasma-Facing Materials and Components for Fusion Applications. Location: Max Planck Inst Plasma Phys, Greifswald Branch, Greifswald, GERMANY. Date: OCT 10-12, 20062010-08-052010-08-052011-09-09Bibliographically approved