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Dust generation in tokamaks: Overview of beryllium and tungsten dust characterisation in JET with the ITER-like wall
Culham Sci Ctr, Culham Ctr Fus Energy, Abingdon OX14 3DB, Oxon, England..
Warsaw Univ Technol, PL-02507 Warsaw, Poland.;Inst Elect Mat Technol, PL-01919 Warsaw, Poland..
Warsaw Univ Technol, PL-02507 Warsaw, Poland..
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2018 (English)In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 136, p. 579-586Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 136, p. 579-586
Keywords [en]
JET tokamak, ITER-like wall, Dust, Beryllium, Tungsten
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-240780DOI: 10.1016/j.fusengdes.2018.03.027ISI: 000452583700110Scopus ID: 2-s2.0-85044008512OAI: oai:DiVA.org:kth-240780DiVA, id: diva2:1277037
Conference
13th International Symposium on Fusion Nuclear Technology (ISFNT), SEP 25-29, 2017, Kyoto, Japan
Note

QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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Rubel, MarekPetersson, Per

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