High in the northcentral mountains of Los Alamos, New Mexico, is the Manuel Lujan, Jr. Neutron Scattering Center (LANSCE), a pulsed-spallation neutron source located at the Los Alamos National Laboratory. At LANSCE, neutrons are produced by spallation when a pulsed 800-MeV proton beam impinges on a tungsten target. The proton pulses are provided by the Clinton P. Anderson Meson Physics Facility (LAMPF). An associated Proton Storage Ring (PSR) then alters the intensity, time structure, and repetition rate of the pulses (Figure 1).