Determination of the Poloidal Magnetic Field Profiles in a Tokamak by Polarization Spectroscopy of an Impurity Ion Line
- 10 October 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 61 (15), 1724-1727
- https://doi.org/10.1103/PhysRevLett.61.1724
Abstract
Profiles of the poloidal magnetic field in Ohmically heated, sawtoothing discharges are determined in the Texas Experimental Tokamak (TEXT) from a precise measurement of the partial circular polarization of an impurity-ion line, TiXVII 3834 Å. The sawtooth-period-averaged safety factor (inverse of the rotational transform) on the plasma axis is found to be close to 1.0, independent of its value on the plasma edge. The measurements indicate a decoupling of the current and temperature profiles and a flat current density profile in the center of the discharge.Keywords
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