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First bushing ring for neutral beam produced

Sabina Griffith

Takashi Inoue (Japan Atomic Energy Agency, JAEA) and Masanobu Tanaka (ITER) proudly present a prototype of the ceramic bushing ring for the ITER neutral beam heating system. (Click to view larger version...)
Takashi Inoue (Japan Atomic Energy Agency, JAEA) and Masanobu Tanaka (ITER) proudly present a prototype of the ceramic bushing ring for the ITER neutral beam heating system.
A prototype of the five bushing rings that serve as insulators on ITER's neutral beam heating system has been produced at KYOCERA Corporation and passed testing of the metalizing/brazing process at Hitachi Haramachi Electronics Company in Japan.

The bushing rings connect the high pressure transmission lines for the 1 megavolt power supply with the vacuum chamber inside the neutral beam system. The rings are made of a special ceramic (alumina) with conductor plates brazed for the electrical connections and measure 1.46 metres in diameter.


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