The Department of Energy's Spallation Neutron Source, which recently set a record for beam power for a pulsed neutron source while operating at only a tenth of its eventual 1.4 megawatts of power, has added a fourth instrument to its growing arsenal. The Wide Angular-Range Chopper Spectrometer (ARCS) team sent the first neutrons to the instrument, one of an eventual 24 state of the art neutron scattering instruments the SNS can accommodate on its 18 beam lines. The ARCS joins the Magnetism Reflectometer, the Liquids Reflectometer and the Backscattering Spectrometer as the currently operating instruments at the SNS, which is funded by DOE's Office of Science.
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