EU/RF collaborative tasks on ITER diagnostics – EU Contribution to Optical Fibre Development - Revision 1

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Abstract

Hydrogen-loading is a powerful method to protect optical fibres against darkening in a large range of irradiation conditions [8]. Taking into account that all the irradiation tests are accelerated, i.e. involving high dose-rate conditions, and knowing that high dose-rates induce more RIA degradation in the fibres, we can infer that all our radiation tests are conservative and that hydrogen-loaded fibres can withstand the ITER radiation field to a large extent. The major difficulty is now in the technological fabrication of hydrogenated large-core fibre bundles. Such fabrication has not been demonstrated yet. Endlessly ultimate radiation resistance in fibres could be thinkable by feeding the fibres constantly with a small amount of hydrogen. The approach could be envisaged using microstructured fibres containing air holes (porous medium) enhancing greatly and in-situ the hydrogen diffusion. Such an idea was demonstrated in a short BR2 irradiation test and already reported in the EFDA documentation.

Details

Original languageEnglish
PublisherBelgian Nuclear Research Center
Number of pages17
Edition1
Publication statusPublished - Oct 2010

Publication series

NameSCK•CEN Reports
PublisherStudiecentrum voor Kernenergie
No.ER-168-rev-1

Keywords

  • fusion, ITER, EFDA, fibre optics, hydrogen-loading, irradiation, radiation tests, RIA, degradation, fibres

ID: 169541