Feasibility study of the transfer of the neutron resonance spin-echo spectrometer MUSES from continuous reactor to pulsed source

Abstract

The Orphée reactor, located at the CEA Saclay near Paris, that was used to produce neutrons for scattering experiments over the past four decades has been stopped definitively in October 2019. The Laboratoire Léon Brillouin, the laboratory that operated the diffractometers and spectrometers around the Orphée reactor, is studying the possibility to build a compact Neutron Source to keep offering neutron beams to the French neutron scattering community. The efficient use of a pulsed source requires neutron instrumentation using Time-of-Flight (TOF) principles.The transfer of NSE spectrometer from continuous to pulse source requires the change of monochromatic neutron beam spin-echo technique to the TOF one. Here we report a successful attempt of adaptation of the Neutron Resonance Spin-Echo spectrometer MUSES (G1bis) to a pulsed source with a frequency of 20 Hz and a duty cycle of roughly 5 %.