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Abstract
Photo-neutron emission in H2 and He discharges was observed in the initial ohmic heating experiments of the Heliotron-E. Typical total neutron yield was 109 neutrons per pulse under high level of runaway electrons (≧10 MeV). Neutron flux was localized near the limiters. Energy spectrum of neutrons was continuous up to about 2 MeV. The radioactive nuclides in the limiters and the vacuum chamber irradiated by runaway electrons showed that 58Ni(γ, n) 57Ni and 53Cr(γ, n)51Cr reactions had occurred, proving that the photo-disintegration process was the source of neutron flux.