Gamma-ray induced absorption in optical fibers used for plasma diagnostics

Summary form only given, as follows. For the remote diagnostics of plasma, adequate connection links to transfer the measuring signal in media with high electromagnetic disturbances are needed. Optical channels have to be employed for electromagnetic immunity. When using such optical systems coupled to fusion installations several problems arise related to the modifications induced by the radiation/high temperature induced stress into individual components (diagnostics windows, optical fiber guides, connecting subsystems). Up to now, very few data axe available on the ionizing radiation degradation of the UV transmission of optical fibers. We focused on the evaluation of radiation induced changes in the optical transmission for different commercially available optical fibers, to be used in optical periscopes for plasma diagnostics in fusion installations.