Pulsed Spallation Neutron Source Research Articles

Pulsed spallation neutron sources for slow neutron scattering

The role of pulsed spallation neutron sources for slow neutron spectroscopy is sketched. Various methods of neutron production, and some aspects of the spallation neutron production process are outlined. Accelerators for pulsed spallation neutron sources are discussed. Materials and coolants for neutron-producing targets and moderators are surveyed. The performance of moderators and the effects of varying size, composition, and temperature are summarized. Expressions for estimating moderator performance are given. The effect of moderator-reflectors, which enhance the slow neutron beam current at low energies, are examined. The ZING-P prototype pulsed neutron source and the proposed Intense Pulsed Neutron Source are described. Pulsed spallation sources are a new generation of sources for slow neutron spectroscopy which offer an order of magnitude improvements over currently available thermal neutron flux and several orders of magnitude greater epithermal flux.

Inverted geometry TOF spectrometer at the ZING-P pulsed neutron source prototype

A neutron inelastic scattering spectrometer has been constructed and operated at the spallation pulsed neutron source prototype (ZING-P) at Argonne National Laboratory. The spectrometer operates in the inverted geometry mode with a pulsed polychromatic incident beam and a focused crystal analyzer in the scattered beam. High efficiency is achieved by the large angular acceptance of the analyzer unit. The instrument is useful for the measurement of spectra in the range 0–200 meV in cases where the value of the momentum transfer is not crucial.