Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

4 items found (0 items not approved), displaying all items.1

Instruments / Technical Area	Publication Details	Published
Optics	Passive doubly curved structures for determining clamping forces applied to X-ray optic assemblies Eleanor V. Bainbridge , Jonathan D. Griffiths , Hiten Patel , Jessica Clunan , Peter Docker Journal Of Synchrotron Radiation 30 DOI: 10.1107/S1600577523007579 Open Access Show Abstract ▼ Abstract: Clamping of indirectly cryogenically cooled X-ray optics is required to ensure effective heat transfer between the optic and heat exchanger. However, clamping forces can result in distortion of the optical surface of monochromators and mirror systems, which causes angular distortions of the subsequent beam. As such, there is a need for greater understanding of how these optics are assembled and how this affects their performance throughout their life cycle. In this paper, the potential for non-contact, in-process monitoring of the clamping force both during and after assembly using an additively manufactured passive structure based on a doubly curved hyperbolic paraboloid and designed for application to the first crystal for the I20 monochromator at Diamond Light Source is investigated numerically and experimentally. The performance of the passive structure both pre- and post-cryogenic quenching is characterized experimentally. Laser displacement measurements reveal approximately 9 µm total displacement in the passive structure per 100 N of bolt preload, corresponding to an effective magnification of the preload adjustment of approximately 2.5×.	Nov 2023
Metrology Optics	Measuring sub nanoradian angles A. Yacoot , S. Alcock , R. Ince , H. Patel SMSI 2023 DOI: 10.5162/SMSI2023/D6.2 Show Abstract ▼ Abstract: This paper describes the application of optical interferometry for high accuracy angle metrology to characterize the performance of Diamond Light Source’s small angle generator NANGO that is used to support testing of x-ray optics. The optical interferometer offers a higher resolution and bandwidth than is achievable with commercially available autocollimators and was used to measure traceably nanoradian steps and sub nanoradian oscillations generated by NANGO.	Aug 2023
Metrology	Generating and measuring pico-radian angles Simon Alcock , Andrew Yacoot , Rabia Ince , Hiten Patel Metrologia DOI: 10.1088/1681-7575/ac9736 Open Access Show Abstract ▼ Abstract: The angular performance of a nano-angle generator (NANGO) developed at Diamond Light Source has been characterised using a dual-beam laser interferometer designed and built at the National Physical Laboratory (NPL). NANGO is a flexure-based, piezo actuated device which generates milli- to sub-nano-radian angles for the calibration of metrology instruments used to test the quality of synchrotron X-ray mirrors and angular nano-positioning stages at Diamond. The NPL interferometer provides traceability for small angle measurements made by NANGO. An uncertainty budget has been developed for measurements over a 50 nanoradian range. In closed-loop, using feedback from the NANGO's angle encoder, for the first time we show that 1 nanoradian steps made by NANGO are measurable by an external metrology device. The 200 kHz acquisition rate of the NPL angle interferometer also reveals new dynamic information about NANGO's angular motion. The NPL interferometer demonstrates that NANGO in open-loop can make: distinct steps of 500 picoradians; sinusoidal oscillations at 0.4 Hz with an amplitude of 125 picoradians; or 1 nanoradian oscillations at 40 Hz. Traceability to the SI though National Metrology Institute instrumentation for NANGO will provide enhanced accuracy for a wide range of angle metrology applications at Diamond, including inputs to deterministic polishing techniques for the creation of next-generation X-ray mirrors and dynamic characterisation of nano-positioning stages.	Oct 2022
DIAD-Dual Imaging and Diffraction Beamline	Flexible positioning of a large area detector using an industrial robot Christina Reinhard , Michael Drakopoulos , Christopher M. Charlesworth , Andrew James , Hiten Patel , Paul Tutthill , Davide Crivelli , Hans Deyhle , Sharif I. Ahmed Journal Of Synchrotron Radiation 29, 1004 - 1013 DOI: 10.1107/S1600577522006300 Diamond Proposal Number(s): [30995] Open Access Show Abstract ▼ Abstract: The DIAD beamline for Dual Imaging and Diffraction at Diamond Light Source has opted to use an industrial robot to position its Dectris Pilatus 2M CdTe diffraction detector. This setup was chosen to enable flexible positioning of the detector in a quarter-sphere around the sample position whilst reliably holding the large weight of 139 kg of detector, detector mount and cabling in a stable position. Metrology measurements showed that the detector can be positioned with a linear repeatability of <19.7 µm and a rotational repeatability of <16.3 µrad. The detector position stays stable for a 12 h period with <10.1 µm of movement for linear displacement and <3.8 µrad for rotational displacement. X-ray diffraction from calibration samples confirmed that the robot is sufficiently stable to resolve lattice d-spacings within the instrumental broadening given by detector position and beam divergence.	Jul 2022

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User