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Instruments / Technical Area	Publication Details	Published	Actions
Mechanical Engineering	A new procurement strategy to challenge the supplier constraints created when using a fully developed reference design G. E. Howell , N. Baker , S. Davies , M. Garcia-fernandez , H. C. Huang , S. M. Scott , A. Walters , K. Zhou MEDSI2018 DOI: 10.18429/JACoW-MEDSI2018-THOPMA04 Open Access Show Abstract ▼ Abstract: A common procurement strategy is to produce a fully optimised reference design that makes assumptions about the manufacturing process and supplier capability. This approach can restrict the opportunities for some companies to include their own specialist manufacturing capability to provide a more effective and cost efficient solution. A new approach is suggested following the recent experience at Diamond Light Source. The manufacture of high stiffness welded fabrications up to 13m in length for the I21 RIXS Spectrometer is used as an example. The I21 RIXS Spectrometer design was optimised for stiffness and control of vibration. The use of Finite Element Analysis enabled different design options and compromises to be explored utilising the supplier's capabilities. The final design was tested during manufacture to verify the FEA model. With the I21 RIXS Spectrometer commissioned the data collected shows the final stability performance of the system including detector stability over full experiment durations has met the scientific goals of the design.	Dec 2018
	Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO A. C. Walters , H. C. Walker , R. Springell , M. Krisch , A. Bosak , A. H. Hill , C. E. Zvorişte-walters , E. Colineau , J.-c. Griveau , D. Bouëxière , R. Eloirdi , R. Caciuffo , T. Klimczuk Journal Of Physics: Condensed Matter 27 DOI: 10.1088/0953-8984/27/32/325702 PMID: 26214712 Show Abstract ▼ Abstract: X-ray diffraction, specific heat, magnetic susceptibility and inelastic x-ray scattering measurements on the transurarium oxypnictides NpFeAsO and NpFeAsO0.85F0.15 are presented. No superconductivity down to 2 K was observed upon fluorine doping, contrary to the structurally analogous rare-earth pnictides. No modification of the phonon density of states was observed upon doping with fluorine. We discuss our results in light of the latest experimental and theoretical studies on the role of phonons in the superconducting pnictide compounds.	Aug 2015

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