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Modelling of carbon migration during JET C-13 injection experiments
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.ORCID-id: 0000-0001-9901-6296
Vise andre og tillknytning
2008 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 48, nr 10Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

JET has performed two dedicated carbon migration experiments on the final run day of separate campaigns ( 2001 and 2004) using (CH4)-C-13 methane injected into repeated discharges. The EDGE2D/NIMBUS code modelled the carbon migration in both experiments. This paper describes this modelling and identifies a number of important migration pathways: ( 1) deposition and erosion near the injection location, ( 2) migration through the main chamber SOL, (3) migration through the private flux region (PFR) aided by E x B drifts and ( 4) neutral migration originating near the strike points. In H-Mode, type I ELMs are calculated to influence the migration by enhancing erosion during the ELM peak and increasing the long-range migration immediately following the ELM. The erosion/re-deposition cycle along the outer target leads to a multistep migration of C-13 towards the separatrix which is called 'walking'. This walking created carbon neutrals at the outer strike point and led to 13C deposition in the PFR. Although several migration pathways have been identified, quantitative analyses are hindered by experimental uncertainty in divertor leakage, and the lack of measurements at locations such as gaps and shadowed regions.

sted, utgiver, år, opplag, sider
2008. Vol. 48, nr 10
Emneord [en]
scrape-off layer, diii-d, fusion devices, divertor plasmas, material, erosion, inner divertor, fuel inventory, target plates, asdex upgrade, deposition
Identifikatorer
URN: urn:nbn:se:kth:diva-17932DOI: 10.1088/0029-5515/48/10/105002ISI: 000260566300002Scopus ID: 2-s2.0-58149305382OAI: oai:DiVA.org:kth-17932DiVA, id: diva2:335977
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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