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Instruments / Technical Area	Publication Details	Published
Optics	Compensation of x-ray mirror distortion by cooling temperature control Matthew Hand , Hongchang Wang , Maria Harkiolaki , Federica Venturini , Rosa Arrigo , Pilar Ferrer Escorihuela , Simon Alcock , Ioana Nistea , Andy Marshall , Stewart Scott , Liz Duke , Georg Held , Kawal Sawhney Proceedings of the 13th International Conference on Synchrotron Radiation Instrumentation – SRI2018 DOI: 10.1063/1.5084675 Open Access Show Abstract ▼ Abstract: Synchrotron radiation is emitted from a bending magnet source in a wide ray fan which is collected by the first optical element in a beamline. In order to maximize angular acceptance, and hence flux, it is beneficial to increase the length of this mirror and optical design requirements may necessitate that the optical surface be over 1 m in length. Such mirrors also require cooling as they may be subject to high heat loads from the incident radiation. Two beamlines, B07 and B24, at Diamond Light Source, UK, use 1.4 m long toroidal mirrors which utilize a similar side-clamped cooling manifold design. While this scheme has been successful in providing effective cooling of the mirror, it has also been discovered that it introduces deformation of the radius of curvature which is sufficient to alter the focusing characteristics of the mirror. At both beamlines, the horizontal focus of the beam was found to differ by up to several meter from the design position at the exit slit which resulted in poor flux throughput, reduced energy resolution and other side effects. A pencil beam scan method has been used to diagnose this issue and infer the position of the focus and mirror shape. Through the use of a standalone chiller to alter the temperature of the water within the cooling loop, it has been possible to correct the distortion of the radius and restore the focus to its nominal position.	Jan 2019
Mechanical Engineering Vacuum	Upgrading a transmission SAX/WAX beamline to allow high quality GISAX/GIWAX experiments for soft matter thin film A. R. Marshall MEDSI2016 DOI: 10.18429/JACoW-MEDSI2016-THAA04 Open Access Show Abstract ▼ Abstract: The project required a sample environment to deliver experiments in vacuum or helium, with high humidity, including capacity to use aggressive solvents. The compact, transportable system incorporates a high precision in-vacuum manipulator/ positioning stage (with repeatability better than 1 μm/ 1 mdeg) allowing for multiple sample configurations. Current sample mounts include in-situ film formation (Doctor Blade), thermal annealing/drying heater stage, sample cooling and multiple sample stages; the system has been designed to accommodate many sample substrate formats. The existing end station camera system has been upgraded to include two, in-vacuum, WAXS and SAXS area detectors, which are custom builds based on the Pilatus 6M. The SAX detector module includes three in vacuum, independent ,configurable SAXS beam stop manipulators to block GISAXS transmitted, reflected and specular flare as well as isotropic and anisotropic SAX, a photon sensitive detector shutter plate is included. The 4mm diameter tungsten beam stops each include a miniature photodiode to measure beam intensity and can be positioned to within 10 μm precision in X and Y over 300mm x 250mm motion range.	Jun 2017
	Diamond Beamline I16 (Materials & Magnetism) S. P. Collins , A. Bombardi , A. R. Marshall , J. H. Williams , G. Barlow , A. Day , M. R. Pearson , R. J. Woolliscroft , R. D. Walton , G. Beutier , G. Nisbet SRI 2009, 10th International Conference On Radiation Instrumentation DOI: 10.1063/1.3463196 Show Abstract ▼ Abstract: We describe the key features and performance specifications of a facility for high-resolution single-crystal x-ray diffraction at Diamond Light Source. The scientific emphasis of the beamline is materials- and x-ray-physics, including resonant and magnetic scattering. We highlight some of the more novel aspects of the beamline design.	Jun 2010

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