Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV

Stagni, A.; Vianello, N.; Tsui, C. K.; Colandrea, C.; Gorno, S.; Bernert, M.; Boedo, J. A.; Brida, D.; Falchetto, G.; Hakola, A.; Harrer, G.; Reimerdes, H.; Theiler, C.; Tsitrone, E.; Walkden, N.

doi:10.1088/1741-4326/ac8234

Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV

Journal Article · Tue Aug 16 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac8234· OSTI ID:1979422

^[1]; ^[2]; ^[3]; Colandrea, C. ^[4]; ^[4]; Bernert, M. ^[5]; ^[3]; ^[5]; Falchetto, G. ^[6]; Hakola, A. ^[7]; ^[8]; ^[4]; ^[4]; Tsitrone, E. ^[6]; ^[9]

Consorzio RFX (Italy); OSTI
Consorzio RFX (Italy)
Univ. of California, San Diego, CA (United States)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
CEA, IRFM, Saint Paul Lez Durance (France)
VTT Technical Research Centre (Finland)
Technische Univ. Wien (Austria)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

A set of high density, highly shaped H-mode discharges has been performed in the TCV tokamak with the aim of assessing the effects of increasing divertor neutral recycling on the properties of upstream inter-ELM scrape-off layer (SOL) profiles and transport. An increase of divertor neutral pressure has been correlated with the evolution of separatrix properties and turbulence level. The latter has been quantified by means of the α_t parameter introduced in (Eich 2020 Nucl. Fusion 60 056016), describing the contribution of resistive-interchange turbulence in the SOL relative to drift wave transport. The analysis reveals a general broadening of the upstream SOL profiles as α_t increases, with the SOL power width measured by the vertical IR thermography system increasing significantly. In a similar way, the upstream density profile widens in the near SOL, whereas in the far SOL a density shoulder is observed to progressively form and increase in amplitude. This behaviour is associated with an enhancement of far SOL turbulent transport in the form of blob-filaments travelling radially faster across the far SOL and becoming bigger at higher α_t. Finally, the detected filaments, evaluated from the fast reciprocating probe at the outer midplane, are determined to mostly belong to the resistive ballooning and resistive X-point regimes.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: EUROfusion MST1 Team; TCV Team

Grant/Contract Number:: SC0010529

OSTI ID:: 1979422

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 9 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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