期刊
FUSION ENGINEERING AND DESIGN
卷 136, 期 -, 页码 579-586出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2018.03.027
关键词
JET tokamak; ITER-like wall; Dust; Beryllium; Tungsten
资金
- European Union [633053]
- ITER Broader Approach Activity
- Swedish Research Council (VR) [2015-04844]
- Ministry of Science and Higher Education of Poland
- Swedish Research Council [2015-04844] Funding Source: Swedish Research Council
Operation of the JET tokamak with beryllium and tungsten ITER-like wall provides unique opportunity for detailed studies on dust generation: quantity, morphology, location, etc. The programme carried out in response to ITER needs for safety assessment comprises: (i) remotely controlled vacuum cleaning of the divertor; (ii) local sampling of loosely bound matter from plasma-facing components (PFC); (iii) collection of mobilized dust on various erosion-deposition probes located in the divertor and in the main chamber. Results of comprehensive analyses performed by a number of complementary techniques, e.g. a range of microscopy methods, electron and ion spectroscopy, liquid scintillography and thermal desorption, are summarized by following points: (a) Total amount of dust collected by vacuum cleaning after three campaigns is about 1-1.4 g per campaign (19.1-23.5 h plasma operation), i.e. over 100 times smaller than in JET operated with carbon walls (i.e. in JET-C). (b) Two major categories of Be dust are identified: flakes of co-deposits formed on PFC and droplets (2-10 mu m in diameter). Small quantifies, below 1 g, of Be droplets and splashes are associated mainly with melting of beryllium limiters. (c) Tungsten dust occurs mainly as partly molten flakes originating from the W-coated tiles.
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