THE OPTIMUM OPERATING-CONDITIONS OF THE PHASED DOUBLE-ROTOR FACILITY AT THE ET-RR-1 REACTOR

A pulsed neutron polyenergetic thermal beam at ET-RR-I is produced by a phased double-rotor facility. One of the rotors has two diametricall y opposite curved slots, while the second is designed to operate as a rotating collimator. The dimensions of the phased rotating collimator are selected to match the curved slot rotor. The calculated collimator transmissions at different operating conditions are found to be in go od agreement with the experimental ones. The optimum operating conditi ons of the double-rotor facility are deduced. The calculations were ca rried out using a computer program RCOL. The RCOL was designed in FORT RAN-77 to operate on PCs. (C) 1997 Elsevier Science Ltd.