Rotation and transport in Alcator C-Mod ITB plasmas
نویسندگان
چکیده
منابع مشابه
Toroidal Rotation and Momentum Transport in Alcator C-Mod Plasmas with No Momentum Input
The time evolution of toroidal rotation velocity profiles has been measured in Alcator C-Mod [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] plasmas using a tangentially viewing x-ray spectrometer array. The strong co-current toroidal rotation in enhanced Dα (EDA) high confinement mode (H-mode) plasmas is observed to propagate in from the edge on a time scale similar to the energy confi...
متن کاملObservations of Toroidal Rotation Suppression with ITB Formation in ICRF and Ohmic H-mode Alcator C-Mod Plasmas
Co-current central toroidal rotation has been observed in Alcator C-Mod plasmas with on-axis ICRF heating. The rotation velocity increases with plasma stored energy and decreases with plasma current. Very similar behavior has been seen during Ohmic H-modes, which suggests that the rotation, generated in the absence of an external momentum source, is not principally an ICRF effect. A scan of the...
متن کاملDouble Transport Barrier Plasmas in Alcator C-Mod
Double transport barrier plasmas comprised of an edge enhanced Dα (EDA) H-mode pedestal and an internal transport barrier (ITB) have been observed in Alcator C-Mod. The ITB can be routinely produced in ICRF heated plasmas by locating the wave resonance off-axis near |r/a| ∼ 0.5, provided the target plasma average density is above ∼1.4 × 10/m, and can develop spontaneously in some Ohmic H-mode d...
متن کاملImpurity toroidal rotation and transport in Alcator C-Mod ohmic h-mode plasmas
Central toroidal rotation and impurity transport coe cients have been determined in Alcator C-Mod Ohmic High Con nement Mode (H-mode) plasmas from observations of x-ray emission following impurity injection. Rotation velocities up to 3 10 m/s in the co-current direction have been observed in the center of the best Ohmic H-mode plasmas. Purely Ohmic H-mode plasmas display many characteristics si...
متن کاملTransport in Alcator C-Mod H-Modes
Regimes of High Confinement (H-mode) have been studied in the Alcator CMod tokamak [Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. Plasmas with no Edge Localized Modes (ELM-free) have been compared in detail to a new regime, Enhanced Dα (EDA). EDA discharges have only slightly lower energy confinement than comparable ELM-free ones, but show markedly reduced impurity confinement. Thus EDA dis...
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ژورنال
عنوان ژورنال: Nuclear Fusion
سال: 2010
ISSN: 0029-5515,1741-4326
DOI: 10.1088/0029-5515/50/6/064008