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Instruments / Technical Area	Publication Details	Published	Actions
B16-Test Beamline	Preliminary characterisation of the HEXITEC MHz spectroscopic X-ray imaging detector M. C. Veale , S. Bell , B. D. Cline , I. Church , S. Cross , C. Day , M. French , T. Gardiner , N. Ghorbanian , M. D. Hart , L. L. Jones , J. Lipp , T. Nicholls , J. Nobes , M. Prydderch , A. Schneider , P. Seller , D. Sole , M. D. Wilson , V. Dhamgaye , O. Fox , K. Sawhney Journal Of Instrumentation 18 DOI: 10.1088/1748-0221/18/07/P07048 Diamond Proposal Number(s): [32491] Open Access Show Abstract ▼ Abstract: The HEXITECMHz ASIC is the next generation of the STFC's High Energy X-ray Imaging Technology (HEXITEC). With a ×100 increase in the camera frame rate to 1 MHz, the new ASIC is capable of delivering fully spectroscopic X-ray imaging at photon fluxes of 2×106 photons s-1 mm-2. The improved flux capability ensures the relevance of the technology at a new generation of difraction-limited storage ring (DLSR) synchrotrons as well as enabeling dynamic spectroscopic imaging with sub-keV energy resolution to be carried out on millisecond timescales. In this paper preliminary results from X-ray testing of a 0.3 mm thick p-type Si sensor and 2.0 mm thick HF-CdZnTe sensor at the Diamond Light Source Synchrotron are presented for the first time. Each module consists of 80 × 80 pixels on a 250 μm pixel pitch operated at a temperature of 20°C and a frame rate of 1 MHz. For these preliminary measurements, testing was completed using a prototype test system which limited readout to a portion of the 1 MHz output sampled over an SPI test interface at ∼50 Hz. Despite this limitation these measurements allow the spectroscopic performance of the ASIC to be characterised ahead of the full DAQ system. The prototype detectors were characterised using monochromatic X-rays with energies 12–35 keV at fluxes of (0.6 – 2.5) × 106 photons s-1 mm-2. At an X-ray energy of 12 keV, the energy resolution of the p-type Si and HF-CdZnTe detectors were measured to be 1.0 keV and 1.1 keV respectively. At the higher energies of 20 keV and 35 keV the energy resolution in the HF-CdZnTe was measured to be 1.2 keV and 1.4 keV respectively.	Jul 2023
I12-JEEP: Joint Engineering, Environmental and Processing	Correlative full field X-ray Compton scattering imaging and X-ray computed tomography for in situ observation of Li ion batteries Chu Lun Alex Leung , Matthew D. Wilson , Thomas Connolley , Stephen P. Collins , Oxana V. Magdysyuk , Matthieu N. Boone , Kosuke Suzuki , Matthew C. Veale , Enzo Liotti , Frederic Van Assche , Andrew Lui , Chun Huang Materials Today Energy 306 DOI: 10.1016/j.mtener.2022.101224 Diamond Proposal Number(s): [23400] Open Access Show Abstract ▼ Abstract: Increasing electrode thickness is gaining more attention as a potential route to increase energy density for Li ion batteries although the realizable capacity and rate capability are usually limited by Li+ ion diffusion during (dis)charge, especially at increased (dis)charge rates. It remains challenging to visualize and quantify the low atomic number Li+ chemical stoichiometry distribution inside the electrode within commercially standard battery geometry, e.g., coin cells with stainless steel casings. Here, we map the distribution of Li+ chemical stoichiometry in the electrode microstructure inside a working coin cell battery to show the amount of electrode materials contributing to energy storage performance using innovative in situ correlative full-field X-ray Compton scattering imaging (XCS-I) and X-ray computed tomography (XCT). We design and fabricate an ultra-thick (∼1 mm) cathode of LiNi0.8Mn0.1Co0.1O2 with a microstructure containing vertically oriented pore arrays using a directional ice templating method. This novel technique paves a new way to map low atomic number elements in 3D structures and study how the microstructure improves Li+ ion diffusivity and energy storage performance.	Dec 2022

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