Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV

Vianello, N.; Tsui, C.; Theiler, C.; Allan, S.; Boedo, J.; Labit, B.; Reimerdes, H.; Verhaegh, K.; Vijvers, W. A.J.; Walkden, N.; Costea, S.; Kovacic, J.; Ionita, C.; Naulin, V.; Nielsen, A. H.; Juul Rasmussen, J.; Schneider, B.; Schrittwieser, R.; Spolaore, M.; Carralero, D.; Madsen, J.; Lipschultz, B.; Militello, F.

doi:10.1088/1741-4326/aa7db3

Modification of SOL profiles and fluctuations with line-average density and divertor flux expansion in TCV

Journal Article · Thu Aug 03 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa7db3· OSTI ID:1540522

^[1]; ^[2]; ^[3]; Allan, S. ^[4]; Boedo, J. ^[5]; Labit, B. ^[3]; Reimerdes, H. ^[3]; Verhaegh, K. ^[6]; Vijvers, W. A.J. ^[7]; Walkden, N. ^[4]; Costea, S. ^[8]; Kovacic, J. ^[9]; Ionita, C. ^[8]; ^[10]; ^[10]; ^[10]; Schneider, B. ^[8]; Schrittwieser, R. ^[8]; Spolaore, M. ^[11]; Carralero, D. ^[12] more »

University degli Studi di Padova (Italy); Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland). Swiss Plasma Center; DOE/OSTI
University of California San Diego, La Jolla, CA (United States); Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland). Swiss Plasma Center
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland). Swiss Plasma Center
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
University of California San Diego, La Jolla, CA (United States)
University of York (United Kingdom)
Dutch Institute for Fundamental Energy Research, Eindhoven (Netherlands)
University Innsbruck (Austria)
Jozef Stefan Institute, Ljubljana (Slovenia)
Technical University of Denmark, Lyngby (Denmark)
University degli Studi di Padova (Italy)
Max Planck Institute for Plasma Physics, Garching (Germany)

A set of Ohmic density ramp experiments addressing the role of parallel connection length in modifying scrape off layer (SOL) properties has been performed on the TCV tokamak. The parallel connection length has been modified by varying the poloidal flux expansion f_x. It will be shown that this modification does not influence neither the detachment density threshold, nor the development of a flat SOL density profile which instead depends strongly on the increase of the core line average density. The modification of the SOL upstream profile, with the appearance of what is generally called a density shoulder, has been related to the properties of filamentary blobs. Blob size increases with density, without any dependence on the parallel connection length both in the near and far SOL. The increase of the density decay length, corresponding to a profile flattening, has been related to the variation of the divertor normalized collisionality Λ_div, showing that in TCV the increase of Λ_div is not sufficient to guarantee the SOL upstream profile flattening.

View Accepted Manuscript (DOE)

Research Organization:: University of California San Diego, La Jolla, CA (United States)

Sponsoring Organization:: EUROfusion Consortium; USDOE Office of Science (SC)

Contributing Organization:: EUROfusion MST1 Team; TCV Team

Grant/Contract Number:: SC0010529

OSTI ID:: 1540522

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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