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Zeeman polarimetry measurement for edge current density determination using Li-beam probe on JT-60U

Kamiya, Kensaku; Fujita, Takaaki; Kojima, Atsushi; Kubo, Hirotaka

Zeeman polarimetry system has been developed for the edge current density measurement in the JT-60U tokamak. The diagnostic has 20-ch viewing chords covering the plasma peripheral region with a spatial resolution of 1cm. Li-beam injection with beam current of up to 5mA has been achieved. The edge current density profile with the local peak at $$r$$/$$a$$ 0.9 has been identified in the H-mode plasma, which is correlated with large pressure gradient in the pedestal region.

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