Neutron guide-split: A high performance guide bundle concept for elliptical guides

Holm, S. L.; Rasmussen, Nina; Høpfner, Louise; Bertelsen, Mads F.; Voigt, Jörg; Andersen, K.H.; Lefmann, Kim

doi:10.1016/j.nima.2015.01.045

Cited by 1 publication

(1 citation statement)

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“…In fact, 8 of the first 15 instruments selected for ESS are placed at this distance [4], which is about twice as long as the longest instruments currently in use [7]. For this reason, a dedicated guide simulation effort has been coordinated by ESS and performed by several groups during the last decade [5,6,[8][9][10][11][12][13]. The results from these works are that long neutron guides are indeed feasible, when ballistic guide concepts [14,15] are used.…”

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confidence: 99%

Optimization of Performance, Price, and Background of Long Neutron Guides for European Spallation Source

Holm-Dahlin

Olsen

Bertelsen

et al. 2019

QuBS

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We describe a systematic approach for the design of long, ballistic cold, and thermal neutron guides for the European Spallation Source (ESS). The guides investigated in this work are 170 m long and are required to have a narrowing point with room for a pulse shaping chopper placed 6 m from the moderator. In addition, most guides avoid line-of-sight from the moderator to the sample. The guides are optimized in order to find a reasonable trade-off between neutronics performance and construction price. The geometries simulated are closely related to the thermal-neutron multi-length-scale diffractometer HEIMDAL and the cold-neutron multi-analyser spectrometer BIFROST. For the cold-neutron guide an inexpensive solution was found that maintains good transport properties, while avoiding line-of-sight. However, for the thermal-neutron guide the losses when avoiding line-of-sight are large and it seems a good choice to stay in line-of-sight, even though this will increase both the shielding costs and fast-neutron background. The results are of general relevance for the understanding of the relation between transport, background, and price of long neutron guides.

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