Shielding optimization study for 10b-based large area neutron detectors with detailed geant4 model

The European Spallation Source (ESS) sets the scope on replacing 3He tube detectors where it is reasonably achievable, consequently advanced neutron detectors require a signal-To-noise (S/N) ratio high enough to be competitive with 3He tubes and satisfy scientific requirements. Advanced local shielding could provide the improved S/N. The objective of the current study is to create a tool that can be used during the shielding optimization process. The study is performed with Monte-Carlo simulations using a Geant4 version extended with NXSG4, that is capable to handle the crystal structure of specific materials, therefore the effects of neutron absorption, coherent and incoherent scattering were simulated. Validation of the extended Geant4 code, developed at ESS is also part of the current study by comparing the simulated results with analytical calculations. A detailed and realistic model of the state-of-The-Art Multi-Grid detector has been implemented, as it is almost the only prototype with published data on scattering effects. Simulations were performed for appropriate shielding materials with various monoenergetic neutron beams.A robust tool has been developed that could be effectively used to arise the S/N via optimizing the detector shielding for specific setups and requirements for all inelastic instruments.

Kanaki, KalliopiEuropean Spallation Source ESS ERIC, Lund (author)
Hall-Wilton, RichardMittuniversitetet,Avdelningen för elektronikkonstruktion(Swepub:miun)exricwal (author)
Khaplanov, AntonHungarian Academy of Sciences, Centre for Energy Research, Budapest, Hungary (author)
Kittelmann, ThomasHungarian Academy of Sciences, Centre for Energy Research, Budapest, Hungary (author)
European Spallation Source ESS ERIC, LundAvdelningen för elektronikkonstruktion (creator_code:org_t)

In:2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016: Institute of Electrical and Electronics Engineers (IEEE)9781509016426

By the author/editor: Dian, Eszter; Kanaki, Kalliopi; Hall-Wilton, Ric ...; Khaplanov, Anton; Kittelmann, Thom ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Accelerator Phys ...

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