Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/3929
Title: Optimisation and fabrication of a composite pyrolytic graphite monochromator for the Pelican instrument at the ANSTO OPAL reactor
Authors: Freund, AK
Yu, DH
Keywords: Neutrons
Graphite
Optics
Crystals
Opal Reactor
Fabrication
Issue Date: 1-Apr-2011
Publisher: Elsevier
Citation: Freund, A. K., & Yu, D.H. (2011). Optimisation and fabrication of a composite pyrolytic graphite monochromator for the Pelican instrument at the ANSTO OPAL reactor. Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 634(Suppl. 1), S75-S80. doi:10.1016/j.nima.2010.05.052
Abstract: The 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. All rights reserved.
Gov't Doc #: 3812
URI: http://dx.doi.org/10.1016/j.nima.2010.05.052
http://apo.ansto.gov.au/dspace/handle/10238/3929
ISSN: 0168-9002
Appears in Collections:Journal Articles

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.