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in subjects: "Polarimetry"

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Optical Design for Li Beam Zeeman Polarimetry Measurements on Diii-D

Measurements of the magnetic field pitch angle are obtained from the polarization characteristics of the {sigma} component of the Zeeman triplet of Li emission at 670.8 nm. A four element optical system images a horizontal Li beam on an array of 3 x 32, 1 mm diam. optical fibers, providing 32 spatial channels with 5 mm radial resolution in the plasma. Low Verdet constant glass is used for all optical elements near the DIII-D vessel to minimize the effects of Faraday rotation caused by stray mag… more

Date: August 1, 2002

Creator: Carlstrom, T. N.; Thomas, D. M. & Brewis, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

DETAILED MEASUREMENTS OF THE ELECTRON CYCLOTRON CURRENT DRIVE EFFICIENCY ON DIIID

Electron cyclotron current drive (ECCD) experiments on the DIII-D tokamak are solidifying the physics basis for localized, off-axis current drive, the goal being to validate a predictive model for ECCD. The ECCD profiles are determined from the magnetic field pitch angles measured by motional Stark effect (MSE) polarimetry. The measured ECCD switches from the co to the counter direction as the toroidal injection angle is varied with a profile width that is in accordance with ray tracing calcula… more

Date: May 1, 2002

Creator: Petty, C. C.; Prater, R.; Lohr, J.; Luce, T. C.; Fox, W. R.; Harvey, R. W. et al.