Beryllium migration in JET ITER-like wall plasmas

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Fältnamn	Indikatorer	Metadata
000		06976naa a2200817 4500
001		oai:DiVA.org:kth-170986
003		SwePub
008		150713s2015 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
009		oai:DiVA.org:uu-425696
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1709862 URI
024	7	a https://doi.org/10.1088/0029-5515/55/6/0630212 DOI
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4256962 URI
040		a (SwePub)kthd (SwePub)uu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Brezinsek, S.u Forsch Zentrum Julich GmbH, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany;Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany4 aut
245	1 0	a Beryllium migration in JET ITER-like wall plasmas
264		c 2015-05-08
264	1	b IOP Publishing,c 2015
338		a print2 rdacarrier
500		a QC 20150713
500		a For complete list of authors see http://dx.doi.org/10.1088/0029-5515/55/6/063021
520		a 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.
650	7	a NATURVETENSKAPx Fysikx Fusion, plasma och rymdfysik0 (SwePub)103032 hsv//swe
650	7	a NATURAL SCIENCESx Physical Sciencesx Fusion, Plasma and Space Physics0 (SwePub)103032 hsv//eng
653		a JET tokamak
700	1	a Widdowson, A.4 aut
700	1	a Mayer, M.4 aut
700	1	a Philipps, V.4 aut
700	1	a Baron-Wiechec, P.4 aut
700	1	a Coenen, J. W.4 aut
700	1	a Heinola, K.4 aut
700	1	a Huber, A.4 aut
700	1	a Likonen, J.4 aut
700	1	a Petersson, Peru KTH,Fusionsplasmafysik4 aut0 (Swepub:kth)u1mnanst
700	1	a Rubel, Mareku KTH,Fusionsplasmafysik4 aut0 (Swepub:kth)u1vrej8y
700	1	a Stamp, M. F.4 aut
700	1	a Borodin, D.4 aut
700	1	a Coad, J. P.4 aut
700	1	a Carrasco, Alvaro Garciau KTH,Fusionsplasmafysik4 aut0 (Swepub:kth)u19t9s7i
700	1	a Kirschner, A.4 aut
700	1	a Krat, S.4 aut
700	1	a Krieger, K.4 aut
700	1	a Lipschultz, B.4 aut
700	1	a Linsmeier, Ch.4 aut
700	1	a Matthews, G. F.4 aut
700	1	a Schmid, K.4 aut
700	1	a Andersson Sundén, Eriku Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)erasu959
700	1	a Militello Asp, Emiliau Uppsala universitet,Tillämpad kärnfysik4 aut
700	1	a Binda, Federico,d 1987-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)frebi774
700	1	a Cecconello, Marcou Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)marce924
700	1	a Conroy, Seanu Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)sco17122
700	1	a Dzysiuk, Nataliau Uppsala universitet,Tillämpad kärnfysik4 aut
700	1	a Ericsson, Göranu Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)ger17122
700	1	a Eriksson, Jacob,c Dr,d 1985-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)jacer352
700	1	a Hellesen, Carl,d 1980-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)cahel173
700	1	a Hjalmarsson, Andersu Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)ahj25356
700	1	a Possnert, Göran,d 1951-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)gpo27116
700	1	a Sjöstrand, Henrik,d 1978-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)hesjo677
700	1	a Skiba, Mateusz,d 1985-u Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)matsk428
700	1	a Weiszflog, Matthiasu Uppsala universitet,Tillämpad kärnfysik4 aut0 (Swepub:uu)mwe25666
700	1	a Zychor, I.u Inst Plasma Phys & Laser Microfus, PL-01497 Warsaw, Poland4 aut
710	2	a Forsch Zentrum Julich GmbH, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany;Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germanyb Fusionsplasmafysik4 org
773	0	t Nuclear Fusiond : IOP Publishingg 55:6q 55:6x 0029-5515x 1741-4326
856	4	u https://doi.org/10.1088/0029-5515/55/6/063021y Fulltext
856	4	u http://iopscience.iop.org/article/10.1088/0029-5515/55/6/063021/pdf
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170986
856	4 8	u https://doi.org/10.1088/0029-5515/55/6/063021
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425696

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Fusion Plasma an ...

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