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3HeDf'LiD thermal-to-fusion (E=14 MeV) neutron converters have been developed at the IWW-2M reactor to simulate the irradiation of structural materials in a fusion reactor. These converters increase the highest energy part of the neutron spectrum (E > 14 MeV) by =10lo n/ (cm2*s) in the reactor's test channel (=6-cm dim.), corresponding to a 14-MeV neutron fluence of =2*1016 dcm' per 500-hour reactor cycle. However, the high energy release (up to 1-2 kW/gr) in the converters from the 6Li(n,T)a and 3He(n,T)p exothermal reactions created there can be a critical problem in conducting experiments of this kind.

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