Triton burnup measurements using scintillating fiber detectors on JT-60U

T. Nishitani, M. Isobe, G. A. Wurden, R. E. Chrien, H. Harano, K. Tobita, Y. Kusama

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20 Citations (Scopus)


A new type of 14 MeV neutron detector, based on scintillating fibres, was developed for triton burnup measurements in JT-60U deuterium discharges. The detector consists of an array of scintillating fibres embedded in an aluminum matrix, coupled to a magnetic-resistant phototube with a high current output base, enabling count rates up to 100 MHz. The detector characteristics have been investigated using the Fusion Neutron Source (FNS) DT neutron generator. From the time-dependent measurement of 14 MeV neutron emission in neutral beam (NB) heated plasma discharges, the fast triton diffusivity has been evaluated to be 0.05-0.15 m2 s-1. Loss of fast tritons caused by Toroidal Alfvén Eignmode (TAE) instability was observed in the peripheral region of the plasma.

Original languageEnglish
Pages (from-to)563-566
Number of pages4
JournalFusion Engineering and Design
Publication statusPublished - 1997 Mar


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