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20 April 2024 |
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Article overview
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Disentangling time-focusing from beam divergence: a novel approach for high-flux thermal neutron spectroscopy at continuous and long-pulse sources | | M. Zanatta
; K.H. Andersen
; P.P. Deen
; A. Orecchini
; A. Paciaroni
; C. Petrillo
; F. Sacchetti
; | | Date: |
12 Apr 2019 | | Abstract: | We present the concept of a novel time-focusing technique for neutron
spectrometers, which allows to disentangle time-focusing from beam divergence.
The core of this approach is a double rotating-crystal monochromator that can
be used to extract a larger wavelength band from a white beam, thus providing a
higher flux at the sample compared to standard time-of-flight instruments, yet
preserving energy resolution and beam collimation. The performances of a
spectrometer based on this approach are quantitatively discussed in terms of
possible incident wavelengths, flux at the sample and $(Q,E)$-resolution.
Analytical estimates suggest flux gains of about one order of magnitude at
comparable resolutions in comparison to conventional time-of-flight
spectrometers. Moreover, the double monochromator configuration natively shifts
the sample away from the source line-of-sight, thus significantly improving the
signal-to-noise ratio. The latter, in combination with a system that does not
increase the beam divergence, brings the further advantage of a cleaner access
to the low-$Q$ region, which is recognized to be of fundamental interest for
magnetism and for disordered materials, from glasses to biological systems. | | Source: | arXiv, 1904.6189 | | Services: | Forum | Review | PDF | Favorites | |
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