Plasma and Fusion Research
Online ISSN : 1880-6821
Regular Articles
Development of Langmuir Probes on Divertor Cassettes in JT-60SA
Masakatsu FUKUMOTOShinji SAKURAINobuyuki ASAKURAKiyoshi ITAMI
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2013 Volume 8 Pages 1405153

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Abstract

Langmuir probes installed in the lower divertor region under high heat flux have been developed and manufactured for JT-60SA. A probe electrode with a head having a rooftop shape is made of a carbon fiber composite and can withstand heat fluxes of up to 10 MW/m2 for 5 s and 1 MW/m2 for 100 s. This has been achieved by increasing the volume of the probe electrode that is not directly exposed to the plasma. To minimize the reduction of the heat removal performance of the divertor, the Langmuir probes are installed in toroidal gaps with widths of 10 mm between the divertor cassettes, without embedding them in the divertor tiles. Aluminum oxide coatings have been applied to insulate the probe electrodes from the divertor cassettes and to limit the toroidal thickness to 8 mm. Brazing of the nickel connectors to the probe electrodes has reduced the toroidal thickness of the Langmuir probes. A minimum spatial resolution of 13.5 mm has been achieved to the Langmuir probes installed on the inner and outer divertor targets.

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© 2013 by The Japan Society of Plasma Science and Nuclear Fusion Research
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