Accelerator driven neutron sources

Recently, accelerator driven neutron sources have become major for neutron experiments. Neutron scattering is most active field in the neutron applications. Furthermore, boron neutron capture therapy (BNCT) is another field recently activated in Japan. Such background accelerated the construction of accelerator driven neutron sources and there already exist neutron sources from compact (∼few kW) to large scale (∼MW) ones. To produce neutrons various kinds of reactions have been used depending on the accelerated particle energy and type. Here, neutron production reactions and neutron moderator system are introduced, which are used for the accelerator driven neutron sources. (author)