Tailoring the energy resolution of MIRACLES, the time-of-flight – backscattering spectrometer at the ESS: An updated proposal for the chopper cascade
2019; Elsevier BV; Volume: 564; Linguagem: Inglês
10.1016/j.physb.2018.12.001
ISSN1873-2135
AutoresP. Luna, Heloisa N. Bordallo, Nikolaos Tsapatsaris, K.H. Andersen, I. Herranz, F. Sordo, F. Jiménez‐Villacorta,
Tópico(s)Nuclear reactor physics and engineering
ResumoA cost-effective chopper layout for the chopper cascade of MIRACLES, the time-of-flight backscattering spectrometer of the European Spallation Source is described. The main driving force is the capability to display a versatile and flexible selection of configuration modes, taking advantage of the long ESS pulse and tailoring the instrument resolution ad hoc, and covering a broad range of observation times from 10 ps to the ns. A key element for the design here presented is the feasibility to reach an energy resolution contribution from the incident neutron beam of ∼1.2 μeV, while keeping the same performance of MIRACLES conceptual design. The present optimized concept results in a well-balanced combination with the contribution from the secondary spectrometer time-of-flight energy resolution, yielding a total energy resolution of 2 μeV at best, and 2.5 μeV when the primary and secondary spectrometer contributions are matched.
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