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We investigated the darkening of two high OH- content quartz fibres irradiated with 24GeV protons at the Cern PS facility IRRAD. The two tested fibres have a 0.6mm quartz core diameter, one with hard plastic cladding (qp) and the other with quartz cladding (qq). These fibres were exposed at about 1.25Grad in 3 weeks. The fibres became opaque below 380nm and in the range 580–650nm. The darkening under...
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