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Recent progress towards a quantitative description of filamentary SOL transport
EURATOM, Max Planck Inst Plasmaphys, D-14476 Garching, Germany.;Max Planck Inst Plasma Phys, D-85748 Garching, Germany..
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.
KTH, Skolan för elektroteknik och datavetenskap (EECS), Elektroteknik, Fusionsplasmafysik.ORCID-id: 0000-0002-9546-4494
Vise andre og tillknytning
Rekke forfattare: 12432017 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 57, nr 5, artikkel-id 056044Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A summary of recent results on filamentary transport, mostly obtained with the ASDEX-Upgrade tokamak (AUG), is presented and discussed in an attempt to produce a coherent picture of scrape-off layer (SOL) filamentary transport. A clear correlation is found between L-mode density shoulder formation in the outer midplane and a transition between the sheath-limited and the inertial filamentary regimes. Divertor collisionality is found to be the parameter triggering the transition. A clear reduction of the ion temperature takes place in the far SOL after the transition, both for the background and the filaments. This coincides with a strong variation of the ion temperature distribution, which deviates from Gaussianity and becomes dominated by a strong peak below 5 eV. The filament transition mechanism triggered by a critical value of collisionality seems to be generally applicable to inter-ELM H-mode plasmas, although a secondary threshold related to deuterium fueling is observed. EMC3-EIRENE simulations of neutral dynamics show that an ionization front near the main chamber wall is formed after the shoulder formation. Finally, a clear increase of SOL opacity to neutrals is observed, associated with the shoulder formation. A common SOL transport framework is proposed to account for all these results, and their potential implications for future generation devices are discussed.

sted, utgiver, år, opplag, sider
IOP PUBLISHING LTD , 2017. Vol. 57, nr 5, artikkel-id 056044
Emneord [en]
ASDEX-Upgrade, SOL transport, filaments, main wall recycling
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-270591DOI: 10.1088/1741-4326/aa64b3ISI: 000423290600001Scopus ID: 2-s2.0-85017408853OAI: oai:DiVA.org:kth-270591DiVA, id: diva2:1413787
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20200311

Tilgjengelig fra: 2020-03-11 Laget: 2020-03-11 Sist oppdatert: 2020-05-11bibliografisk kontrollert

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Bergsåker, HenricBykov, IgorFrassinetti, LorenzoGarcia-Carrasco, AlvaroHellsten, TorbjörnJohnson, ThomasMenmuir, SheenaPetersson, PerRachlew, ElisabethRatynskaia, SvetlanaRubel, MarekStefanikova, EsteraStröm, PetterTholerus, EmmiTolias, PanagiotisOlivares, Pablo VallejosWeckmann, ArminZhou, Yushun
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