Plasma filaments in the scrape-off layer of Wendelstein 7-X

Killer, Carsten; Shanahan, Brendan; Grulke, Olaf; Endler, Michael; Hammond, Kenneth; Rudischhauser, Lukas

doi:10.1088/1361-6587/ab9313

Plasma filaments in the scrape-off layer of Wendelstein 7-X

Journal Article · Mon Jun 22 00:00:00 EDT 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab9313· OSTI ID:1642119

^[1]; ^[1]; Grulke, Olaf ^[2]; ^[1]; ^[3]; ^[1]

Max Planck Inst. für Plasmaphysik, Greifswald (Germany)
Max Planck Inst. für Plasmaphysik, Greifswald (Germany); Technical Univ. of Denmark, Lyngby (Denmark)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Plasma filaments have been observed by reciprocating electric probes in the Scrape-Off Layer (SOL) of the Wendelstein 7-X stellarator. Comparison with target probes indicates that a filament observed in the W7-X SOL extends to the sheath. Two-dimensional simulations of seeded filaments exhibit good quantitative agreement with experimental measurements in filament velocity scalings, despite an assumption of constant field line curvature. Both experiment and simulation show a slow radial propagation of filaments, indicating that filaments are essentially bound to their flux surface and do not perform ballistic radial motion. In contrast, the poloidal propagation along flux surfaces is much faster than the radial motion.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: Euratom; USDOE

Contributing Organization:: W7-X Team: EUROfusion Consortium

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1642119

Alternate ID(s):: OSTI ID: 23028790

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 8 Vol. 62; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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