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000225649 1001_ $$aStefanescu, I.$$b0
000225649 245__ $$aPerformance study of the Jalousie detector baseline design for the ESS thermal powder diffractometer HEIMDAL through GEANT4 simulations
000225649 260__ $$aLondon$$bInst. of Physics$$c2019
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000225649 500__ $$a"© 2019 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. "
000225649 520__ $$aHEIMDAL is a thermal powder diffractometer designed to operate at the European Spallation Source, world's most intense neutron source. The detailed design of the instrument, which is expected to enter user operation in 2024/2025, assumes that the neutrons scattered by the powder under investigation will be collected with hundreds of large-area Multi-Wire Proportional Counters employing a 10B4C-solid converter. The gas counters will consist of large active volumes and tapered trapezoidal shapes that allow for close packing into a cylindrical shell with high solid angle coverage. The whole detector will operate in an air environment within the shielding cave and provide signals with sensitivity for locating detection in three dimensions. This paper presents the results of a GEANT4 study of the baseline design for the HEIMDAL powder diffraction detector. The detector model was used to study the spatial resolution, which in the horizontal scattering plane must be below 3 mm in order to enable high-resolution diffraction studies. The contribution of the detector to the resolving power of the instrument, one of the key figures-of-merit for powder diffractometers, was also investigated. Most of the simulation results reported in this work cannot be validated against a sufficiently similar physical reference until the first segment or module are constructed and tested with a neutron beam. However, these results can help to identify possible ways of optimising the detector design and provide the first glimpse into the expected performance of this technological approach.
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000225649 7001_ $$aChristensen, M.$$b1
000225649 7001_ $$aHall-Wilton, R.$$b2
000225649 7001_ $$aHolm-Dahlin, S.$$b3
000225649 7001_ $$aIversen, K.$$b4
000225649 7001_ $$aKlein, M.$$b5
000225649 7001_ $$aMannix, D.$$b6
000225649 7001_ $$aSchefer, J.$$b7
000225649 7001_ $$0P:(DE-Ds200)OR1122$$aSchmidt, C. J.$$b8$$ugsi
000225649 7001_ $$aSchweika, W.$$b9
000225649 7001_ $$aStuhr, U.$$b10
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