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(CT/P-11) Irradiation Test of Diagnostic Components for ITER Application in a Fission Reactor, Japan Materials Testing Reactor

T. Shikama¹⁾, T. Nishitani²⁾, T. Kakuta³⁾, S. Yamamoto⁴⁾, S. Kasai²⁾, M. Narui¹⁾, E. Hodgson⁵⁾, R. Reichle⁶⁾, B. Brichard⁷⁾, A. Krassilinikov⁸⁾, R. Snider⁹⁾, G. Vayakis¹⁰⁾, A. Costley^10)
 
1) Tohoku University, Sendai, Japan
²⁾ Japan Atomic Energy Research Institute, Naka, Japan
³⁾ Japan Atomic Energy Research Institute, Tokai, Japan
⁴⁾ ITER-JWS-Garching, Garching, Germany
⁵⁾ CIEMAT, Madrid, Spain
⁶⁾ CEA Cadarache, Saint-Paul-lez-Durance, France
⁷⁾ SCK/CEN, Mol, Belgium
⁸⁾ TRINITI, Moscow, Russia
⁹⁾ GA, San Diego, USA
¹⁰⁾ ITER-JWS-Naka, Naka, Japan

Abstract.  The Japanese ITER home team played crucial roles in studying radiation effects in diagnostics components, utilizing JMTR, under close collaborations among universities, JAERI and industries. In-situ studies of performance of the magnetic coil showed that the radiation induced electrical conductivity (RIC) is not a problem when a coil is made of a mineral insulating cable (MI-cable). Magnetic measurements could be carried out up to a few M Hz under the ITER relevant irradiation conditions. A JET-bolometer was irradiation-tested in the JMTR. A structure of the bolometer could withstand the 3 irradiation cycles, corresponding to the expected irradiation dose in the ITER. A few technical problems were found, such as increase of electrical conductivity of a gold meander due to nuclear transmutation of gold into mercury. We found that some optical fibers could be used even for visible application near burning plasma with a limited life. For infrared applications, several optical fibers could be found with a life-time far beyond the ITER whole operation period.

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