Decoupled Moderators - Do we always need them? or: A New Approach for Pulse Shaping

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dc.creatorParizzi, A. A.
dc.creatorLee, W. -T.
dc.creatorFelcher, G. P.
dc.creatorKlose, F.
dc.date2001-05-10
dc.date.accessioned2026-07-07T05:45:47Z
dc.date.available2026-07-07T05:45:47Z
dc.descriptionAt a spallation neutron source, the wavelength of a neutron is generally determined by its time-of-flight (TOF) from the source to the detector. The achievable precision is ultimately limited by the non-zero emission time-width of the source/moderator system. Particularly, coupled moderators that are used to produce high intensity cold neutron beams show long "tails" in the intensity/time distribution for all wavelengths. For this reason much less intense decoupled moderators are often used for instruments that require high resolution. We present here a novel technique for dynamic energy filtering of thermal and cold polarized neutron beams. The device consists of a polarizer/analyzer system and an energy-selective spin-resonance flipper. By drifting its resonance condition in synchronization with the TOF, the filter controls the energy resolution of a broad bandwidth TOF neutron pulse. Calculations show that substantial resolution gains are obtainable by applying this technique to a TOF neutron reflectometer.
dc.descriptionCorresponding author: Frank Klose (FKlose@anl.gov)
dc.identifierhttps://arxiv.org/abs/physics/0105026
dc.identifierhttp://arxiv.org/abs/physics/0105026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/84114
dc.subjectInstrumentation and Detectors
dc.titleDecoupled Moderators - Do we always need them? or: A New Approach for Pulse Shaping
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