English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The Low Energy Neutron Source (LENS) is an accelerator-based pulsed coldneutron facility under construction at the Indiana University CyclotronFacility (IUCF). The idea behind LENS is to produce pulsed cold neutron beamsstarting with ~MeV neutrons from (p,n) reactions in Be which are moderated tomeV energies and extracted from a small solid angle for use in neutroninstruments which can operate efficiently with relatively broad (~1 msec)neutron pulse widths. Although the combination of the features and operatingparameters of this source is unique at present, the neutronic design possessesseveral features similar to those envisioned for future neutron facilities suchas long-pulsed spallation sources (LPSS) and very cold neutron (VCN) sources.We describe the underlying ideas and design details of thetarget/moderator/reflector system (TMR) and compare measurements of itsbrightness, energy spectrum, and emission time distribution under differentmoderator configurations with MCNP simulations. Brightness measurements usingan ambient temperature water moderator agree with MCNP simulations within the20% accuracy of the measurement. The measured neutron emission timedistribution from a solid methane moderator is in agreement with simulation andthe cold neutron flux is sufficient for neutron scattering studies ofmaterials. We describe some possible modifications to the existing design whichwould increase the cold neutron brightness with negligible effect on theemission time distribution.

Neutronic Design and Measured Performance of the Low Energy Neutron Source (LENS) Target Moderator Reflector Assembly