Abstract
A multichannel motional Stark effect polarimeter system, which is capable of simultaneous measurement of a radial electric field, has recently been developed on the JFT-2M. The diagnostic can measure the polarization angle at 18 radial locations, which cover a region between just inside from the magnetic axis and the outboard edge of the plasma. By viewing two neutral beam lines (one is co-parallel to the plasma current and the other is counter parallel) simultaneously and near tangentially to the toroidal magnetic field from only one spectroscopic instruments, it provides the best sensitivity in radial electric field measurements with good spatial resolution. The magnetic field pitch angle is also measured with the smallest uncertainty. Preliminary data for L-mode plasma has been obtained. It is found that the statistical uncertainty of the magnetic field pitch angle and radial electric field is about 0.1° and 4 kV/m, respectively, with a time resolution of 10 ms.
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