Velocity profile shapes in Alcator C-Mod plasmas

Rice, J. E.; Cao, N. M.; Hubbard, A. E.; Hughes, J. W.

doi:10.1088/1741-4326/ad73ba

Title: Velocity profile shapes in Alcator C-Mod plasmas

Journal Article · 23 September 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad73ba · OSTI ID:2447655

; Cao, N. M.; Hubbard, A. E.;

Abstract Toroidal rotation velocity spatial profiles ( $r / a$ $<$ 0.8) have been obtained from C-Mod over a wide range of operational conditions, including H-mode, I-mode, ICRF-heated L-mode and Ohmic L-mode (LOC and SOC), and in plasmas with ITBs, LH wave injection and MCFD. Peaked, flat and hollow rotation profiles have been observed. In H- and I-mode plasmas, generally with co-current peaked profiles, the peaking is correlated with temperature profile peaking, and both increase with toroidal magnetic field (decrease with $ρ_{*}$ ). Any dependence on density peaking is unclear. For Ohmic L-mode discharges, with LOC, the velocity profiles are usually flat and most often directed co-current, while with SOC the profiles are hollow, mostly co-current at the edge and counter-current in the core. Both of these Ohmic rotation states exist with matched density and temperature profiles (and gradients), indicating that neither gradient is relevant during rotation reversals. For plasmas with LH wave injection and discharges with ITBs, the velocity profiles are hollow while the density and temperature profiles exhibit substantial peaking. Broadly speaking for all operational regimes, there is no unifying ordering of the velocity gradient with plasma parameters.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0014264

OSTI ID:: 2447655

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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