Development of a chopper spectrometer at Kens

A direct geometry chopper spectrometer combined with an advanced pulsed neutron source has a promising feasibility for its wide accessible dynamic range in Q-ω space and for the applicable various fields of high energy magnetic excitations, molecular dynamics and dynamics of liquids and glasses. The recent scientific requirements of measuring high energy excitations caused the decision to build a chopper spectrometer at KENS. The development of a sophisticated magnetic bearing made it possible to realize a short chopper burst, due to the high speed revolution, as narrow as the neutron pulse width from a moderator in the epithermal neutron region, providing higher momentum and energy resolution with less sacrifice in intensity. In this report the authors discuss a spectrometer called INC, which is under construction at KENS, aiming at neutron scattering with an energy transfer from 20 to 1,000 meV and a momentum transfer from 0.3 to 40 angstrom -1. 11 refs., 7 figs