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Beryllium migration...
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Brezinsek, S.Forsch Zentrum Julich GmbH, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany;Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany
(author)
Beryllium migration in JET ITER-like wall plasmas
- Article/chapterEnglish2015
Publisher, publication year, extent ...
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2015-05-08
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IOP Publishing,2015
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-170986
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170986URI
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https://doi.org/10.1088/0029-5515/55/6/063021DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425696URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20150713
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For complete list of authors see http://dx.doi.org/10.1088/0029-5515/55/6/063021
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JET is used as a test bed for ITER, to investigate beryllium migration which connects the lifetime of first-wall components under erosion with tokamak safety, in relation to long-term fuel retention. The (i) limiter and the (ii) divertor configurations have been studied in JET-ILW (JET with a Be first wall and W divertor), and compared with those for the former JET-C (JET with carbon-based plasma-facing components (PFCs)). (i) For the limiter configuration, the Be gross erosion at the contact point was determined in situ by spectroscopy as between 4% (E-in = 35 eV) and more than 100%, caused by Be self-sputtering (E-in = 200 eV). Chemically assisted physical sputtering via BeD release has been identified to contribute to the effective Be sputtering yield, i.e. at E-in = 75 eV, erosion was enhanced by about 1/3 with respect to the bare physical sputtering case. An effective gross yield of 10% is on average representative for limiter plasma conditions, whereas a factor of 2 difference between the gross erosion and net erosion, determined by post-mortem analysis, was found. The primary impurity source in the limiter configuration in JET-ILW is only 25% higher (in weight) than that for the JET-C case. The main fraction of eroded Be stays within the main chamber. (ii) For the divertor configuration, neutral Be and BeD from physically and chemically assisted physical sputtering by charge exchange neutrals and residual ion flux at the recessed wall enter the plasma, ionize and are transported by scrape-off layer flows towards the inner divertor where significant net deposition takes place. The amount of Be eroded at the first wall (21 g) and the Be amount deposited in the inner divertor (28 g) are in fair agreement, though the balancing is as yet incomplete due to the limited analysis of PFCs. The primary impurity source in the JET-ILW is a factor of 5.3 less in comparison with that for JET-C, resulting in lower divertor material deposition, by more than one order of magnitude. Within the divertor, Be performs far fewer re-erosion and transport steps than C due to an energetic threshold for Be sputtering, and inhibits as a result of this the transport to the divertor floor and the pump duct entrance. The target plates in the JET-ILW inner divertor represent at the strike line a permanent net erosion zone, in contrast to the net deposition zone in JET-C with thick carbon deposits on the CFC (carbon-fibre composite) plates. The Be migration identified is consistent with the observed low long-term fuel retention and dust production with the JET-ILW.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Widdowson, A.
(author)
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Mayer, M.
(author)
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Philipps, V.
(author)
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Baron-Wiechec, P.
(author)
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Coenen, J. W.
(author)
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Heinola, K.
(author)
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Huber, A.
(author)
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Likonen, J.
(author)
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Petersson, PerKTH,Fusionsplasmafysik(Swepub:kth)u1mnanst
(author)
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Rubel, MarekKTH,Fusionsplasmafysik(Swepub:kth)u1vrej8y
(author)
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Stamp, M. F.
(author)
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Borodin, D.
(author)
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Coad, J. P.
(author)
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Carrasco, Alvaro GarciaKTH,Fusionsplasmafysik(Swepub:kth)u19t9s7i
(author)
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Kirschner, A.
(author)
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Krat, S.
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Krieger, K.
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Lipschultz, B.
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Linsmeier, Ch.
(author)
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Matthews, G. F.
(author)
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Schmid, K.
(author)
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Andersson Sundén, ErikUppsala universitet,Tillämpad kärnfysik(Swepub:uu)erasu959
(author)
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Militello Asp, EmiliaUppsala universitet,Tillämpad kärnfysik
(author)
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Binda, Federico,1987-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)frebi774
(author)
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Cecconello, MarcoUppsala universitet,Tillämpad kärnfysik(Swepub:uu)marce924
(author)
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Conroy, SeanUppsala universitet,Tillämpad kärnfysik(Swepub:uu)sco17122
(author)
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Dzysiuk, NataliaUppsala universitet,Tillämpad kärnfysik
(author)
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Ericsson, GöranUppsala universitet,Tillämpad kärnfysik(Swepub:uu)ger17122
(author)
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Eriksson, Jacob,Dr,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)jacer352
(author)
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Hellesen, Carl,1980-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173
(author)
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Hjalmarsson, AndersUppsala universitet,Tillämpad kärnfysik(Swepub:uu)ahj25356
(author)
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Possnert, Göran,1951-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)gpo27116
(author)
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Sjöstrand, Henrik,1978-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)hesjo677
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Skiba, Mateusz,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)matsk428
(author)
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Weiszflog, MatthiasUppsala universitet,Tillämpad kärnfysik(Swepub:uu)mwe25666
(author)
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Zychor, I.Inst Plasma Phys & Laser Microfus, PL-01497 Warsaw, Poland
(author)
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Forsch Zentrum Julich GmbH, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany;Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, GermanyFusionsplasmafysik
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In:Nuclear Fusion: IOP Publishing55:60029-55151741-4326
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Brezinsek, S.
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Widdowson, A.
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Mayer, M.
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Philipps, V.
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Baron-Wiechec, P ...
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Coenen, J. W.
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show more...
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Heinola, K.
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Huber, A.
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Likonen, J.
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Petersson, Per
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Rubel, Marek
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Stamp, M. F.
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Borodin, D.
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Coad, J. P.
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Carrasco, Alvaro ...
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Kirschner, A.
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Krat, S.
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Krieger, K.
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Lipschultz, B.
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Linsmeier, Ch.
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Matthews, G. F.
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Schmid, K.
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Andersson Sundén ...
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Militello Asp, E ...
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Binda, Federico, ...
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Cecconello, Marc ...
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Conroy, Sean
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Dzysiuk, Natalia
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Ericsson, Göran
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Eriksson, Jacob, ...
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Hellesen, Carl, ...
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Hjalmarsson, And ...
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Possnert, Göran, ...
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Sjöstrand, Henri ...
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Skiba, Mateusz, ...
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Weiszflog, Matth ...
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Zychor, I.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Nuclear Fusion
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Royal Institute of Technology
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