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Decoupled Moderators - Do we always need them? or: A New Approach for Pulse Shaping | | A.A. Parizzi
; W.-T. Lee
; G.P. Felcher
; F. Klose
; | | Date: |
10 May 2001 | | Subject: | Instrumentation and Detectors | physics.ins-det | | Affiliation: | 1, 2, 4), W.-T. Lee (1, 4), G.P. Felcher , F. Klose (1, 4) ( Spallation Neutron Source, Oak Ridge National Laboratory, USA Electrical Engineering Department, Federal University of Rio Grande do Sul, Brazil Materials Science Division, Argonne National | | Abstract: | At 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. | | Source: | arXiv, physics/0105026 | | Services: | Forum | Review | PDF | Favorites | |
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