The primary source of intense neutrons using low energy accelerators has been the T(d,n)(sup 4)He reaction. This reaction produces nominal 14-MeV neutrons which have been used for cross section and nuclear structure measurements for a great many years. As the years progressed, higher intensities were obtained and as higher intensities were obtained new uses for 14-MeV neutrons became feasible. In fact, the most intense 14-MeV neutron sources in use at the present time are devoted to the fusion program. Among these are Oktavian located at Osaka University, Japan and the Fusion Neutronics Source at the Japan Atomic Energy Research Institute. These facilities both have neutronics programs for fusion energy. Lawrence Livermore National Laboratory (LLNL) had two facilities which were used in the past decade for fusion materials studies. These were the RTNS-II and RTNS-I facilities. Both of these facilities ceased operation at least five years ago. The need for intense fast neutron sources in the fusion program still exists. In this paper we will describe the generic rotating target neutron source but paying particular attention to the RTNS-II facility. This facility provided the most intense source of 14-MeV neutrons while operational with a source strength approaching 4(times)10(sup 13) n/s. Higher intensity neutron sources with median energies around (approximately)15MeV have been proposed. These are based on the d+Li reaction using (approx)35MeV deuterons. However, none of these have been built to my knowledge.
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