Correlation time-of-flight spectrometer for fast neutrons

A correlation time-of-flight spectrometer for measuring scattered neutron spectra with initial energy of 14 MeV is considered. The spectrometer contains a pulse neutron source, measuring instruments and a data storage system. The pulse neutron source is made on the basis of a cascade accelerator with the beam interruption system and deuteron targets. An ion beam modulation by a pseudo-casual signal is used in the spectrometer simultaneously with klystron grouping. This permits to preserve ion flux in the pulse and reduce the incoherent background effect on static accuracy. Ion pulses with an amplitude of 2 mmA and duration of 2.4 ns are obtained with the accelerator target. 2 scintillation detectors on the basis of stilbene and photo-electron multipliers are used as neutron detectors. The signal formation from the first detector is carried out by a discriminator with the neutron threshold of about 10 MeV, and from the second detector - by a discriminator with the threshold of 100 keV. The n-γ compensation scheme is used in the second detector. The tests conducted show that integral and differential nonlinearity of the spectrometer equal 0.5 and +-1%, respectively