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000021221 0247_ $$2DOI$$a10.1016/j.nima.2012.03.015
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000021221 084__ $$2WoS$$aInstruments & Instrumentation
000021221 084__ $$2WoS$$aNuclear Science & Technology
000021221 084__ $$2WoS$$aPhysics, Particles & Fields
000021221 084__ $$2WoS$$aSpectroscopy
000021221 1001_ $$0P:(DE-HGF)0$$aHouben, A.$$b0
000021221 245__ $$aNew neutron-guide concepts and simulation results for teh POWTEX instrument
000021221 260__ $$aAmsterdam$$bNorth-Holland Publ. Co.$$c2012
000021221 300__ $$a124 - 133
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000021221 440_0 $$04642$$aNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment$$v680$$x0168-9002
000021221 500__ $$aJorg Voigt is acknowledged for taking part in discussions about elliptic neutron guides. Klaus Lieutenant and Michael Fromme are acknowledged for their effort on the VITESS software. We acknowledge funding from the German Federal Ministry of Education and Research (BMBF) in the frame of a "Verbundforschungsprojekt".
000021221 520__ $$aThe POWTEX instrument will be a high-intensity time-of-flight diffractometer at a continuous reactor source. Its design utilizes several new concepts and is suited for small samples. Herein, the optimization of the guide system is presented. It is based on two coupled elliptic neutron guides intersected by the pulse-chopper as an eye of a needle to increase the time resolution and to reduce the background transported from the source. The optical properties of two coupled ellipses are investigated with respect to their design constraints in terms of geometry and regarding the choice of the super-mirror coating. It is shown that low-divergent neutrons are preferentially transported near the pulse-chopper. Accordingly, a numerical optimization is utilized to tailor the coating to the instrument requirements using the back-tracing method that has been developed for the VITESS Monte-Carlo simulation package for virtual instrumentation. The procedure allows for a cost and background optimization because the me-value can be kept as low as needed. For a diffractometer, the homogeneity of the divergence profile is crucial. Herein, the new development of neutron guides with octagonal cross sections is investigated. Appendix A shows a step-by-step description of the newly developed optimization features within VITESS as it was used for POVVTEX. (C) 2012 Elsevier B.V. All rights reserved.
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000021221 65320 $$2Author$$aNeutron guides
000021221 65320 $$2Author$$aNeutron optics
000021221 65320 $$2Author$$aSuper-mirror coating
000021221 65320 $$2Author$$aMonte-Carlo simulations
000021221 65320 $$2Author$$aPOWTEX
000021221 65320 $$2Author$$aVITESS
000021221 65320 $$2Author$$aNeutron time-of-flight diffractometer
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000021221 7001_ $$0P:(DE-Juel1)130963$$aSchweika, W.$$b1$$uFZJ
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000021221 8567_ $$uhttp://dx.doi.org/10.1016/j.nima.2012.03.015
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