Optimisation and fabrication of a composite pyrolytic graphite monochromator for the Pelican instrument at the ANSTO OPAL Reactor

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dc.contributor.authorFreund, AKen_AU
dc.contributor.authorYu, DHen_AU
dc.date.accessioned2011-12-12T23:31:57Zen_AU
dc.date.available2011-12-12T23:31:57Zen_AU
dc.date.issued2011-04-01en_AU
dc.date.statistics2011-12-13en_AU
dc.description.abstractThe triple monochromator for the TOF neutron spectrometer Pelican at ANSTO has been fully optimised in terms of overall performance, including the determination of the thickness of the pyrolytic graphite crystals. A total of 24 composite crystals were designed and fabricated. The calculated optimum thickness of 1.3 mm and the length of 15 cm of the monochromator crystals, that are not available commercially, were obtained by cleaving and soldering with indium. An extensive characterisation of the crystals using X-ray and neutron diffraction was conducted before and after the cleaving and bonding processes. The results proved that no damage was introduced during fabrication and showed that the design goals were fully met. The measured peak reflectivity and rocking curve widths were indeed in an excellent agreement with theory. In addition to the superior efficiency of the triple monochromator achieved by this novel approach, the amount of the crystal material required could be reduced by 1/3. (C) 2010 Elsevier B.V.en_AU
dc.identifier.citationFreund, A. K., & Yu, D.H. (2011). Optimisation and fabrication of a composite pyrolytic graphite monochromator for the Pelican instrument at the ANSTO OPAL Reactor. Paper presented to the International Workshop on Neutron Optics NOP 2010, 17-19 March 2010, Alpe d'Huez, France. In Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 634(1, Supplement), S75-S80. doi:10.1016/j.nima.2010.05.052en_AU
dc.identifier.conferenceenddate19 March 2010en_AU
dc.identifier.conferencenameInternational Workshop on Neutron Optics NOP 2010en_AU
dc.identifier.conferenceplaceAlpe d'Huez, Franceen_AU
dc.identifier.conferencestartdate17 March 2010en_AU
dc.identifier.govdoc3812en_AU
dc.identifier.issn0168-9002en_AU
dc.identifier.issue1, Supplementen_AU
dc.identifier.journaltitleNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipmenten_AU
dc.identifier.paginationS75-S80en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.nima.2010.05.052en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3929en_AU
dc.identifier.volume634en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNeutronsen_AU
dc.subjectGraphiteen_AU
dc.subjectOpticsen_AU
dc.subjectCrystalsen_AU
dc.subjectOPAL Reactoren_AU
dc.subjectFabricationen_AU
dc.titleOptimisation and fabrication of a composite pyrolytic graphite monochromator for the Pelican instrument at the ANSTO OPAL Reactoren_AU
dc.typeConference Paperen_AU
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