Neutron-Physical Development of Reflectors for the Pulsed Reactor IBR-2

The pulsed fast reactor IBR-2, Dubna, is at present the most powerful pulsed neutron source used for condensed matter research. The neutron pulses are generated periodically by reactivity modulation, which is accomplished by a rotating two-reflector system. The neutron physics which has been involved in the development of various reflectors is analysed with respect to the neutron pulse length. Two new reflectors are proposed.