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Optical fibers, which at once generate and guide Cherenkov light when charged particles pass through them, are widely used to monitor the beam loss at accelerator facilities. In this report, we investigate this application at the J-PARC extraction neutrino beamline, where a 30GeV proton beam with eight bunches of ~20ns (1σ) bunch width and 581ns bucket length, is extracted from the Main Ring, guided, and hit onto a graphite target to produce a highly intense beam of neutrinos. Three 30m-lengthdoi:10.18429/jacow-ibic2020-wepp06 fatcat:wewnhu5a6nb47avmhuxz3saruq