Abstract
We discuss the potential for neutron spectrometers at novel accelerator driven compact neutron sources. Such a High Brilliance Source (HBS) relies on low energy nuclear reactions, which enable cryogenic moderators in very close proximity to the target and neutron optics at comparably short distances from the moderator compared to existing sources. While the first effect aims at increasing the phase space density of a moderator, the second allows the extraction of a large phase space volume, which is typically requested for spectrometer applications. We find that competitive spectrometers can be realized if (a) the neutron production rate can be synchronized with the experiment repetition rate and (b) the emission characteristics of the moderator can be matched to the phase space requirements of the experiment. MCNP simulations for protons or deuterons on a Beryllium target with a suitable target/moderator design yield a source brightness, from which we calculate the sample fluxes by phase space considerations for different types of spectrometers. These match closely the figures of todays spectrometers at medium flux sources. Hence we conclude that compact neutron sources might be a viable option for next generation neutron sources.
Highlights
Neutron scattering has proven to be one of the most powerful methods for the study of dynamics in condensed matter
We have suggested a pulsed source based on low energy nuclear reactions [1], driven by accelerators in the energy range below 50 MeV, called High Brilliance Source (HBS)
We have analyzed the performance of inverse and direct geometry time-of-flight spectrometers at low-energy accelerator driven neutron sources such as the HBS concept
Summary
Neutron scattering has proven to be one of the most powerful methods for the study of dynamics in condensed matter. With the latest development of MW spallation sources the source brightness has reached a new level, exceeding the brightness of the formerly most intense research reactors by more than one order of magnitude Accompanying these brightness gains with an optimized transport and analysis systems, the new instruments at the MW spallation sources promise efficiency gains between two and three orders of magnitude as compared to existing instruments and will enable completely new science. Beside these new bright opportunities, many of today’s applications will still be requested by the users. The initial neutron beam, which has a broad spectral range, is pulsed at a rather large distance from the sample, so initial neutron energy is distinguished by the arrival time at the detector
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