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Instruments / Technical Area	Publication Details	Published	Actions
B16-Test Beamline	Synchrotron Tests of a 3D Medipix2 X-Ray Detector David Pennicard , Julien Marchal , Celeste Fleta , Giulio Pellegrini , Manuel Lozano , Christopher Parkes , Damien Barnett , Nicola Tartoni , Igor Dolbnya , Kawal Sawhney , Richard Bates , Val O'shea , Victoria Wright Ieee Transactions On Nuclear Science 57 (1), 387-394 DOI: 10.1109/TNS.2009.2037746 Show Abstract ▼ Abstract: Three-dimensional (3D) photodiode detectors offer advantages over standard planar photodiodes in a range of applications, including X-ray detection for synchrotrons and medical imaging. The principal advantage of these sensors for X-ray imaging is their low charge sharing between adjacent pixels, which could improve spatial and spectral resolution. A 'double-sided' 3D detector has been bonded to a Medipix2 single-photon-counting readout chip, and tested in a monochromatic X-ray beam at the Diamond synchrotron. Tests of the 3D detector's response spectrum and its Line Spread Function have shown that it has substantially lower charge sharing than a standard planar Medipix2 sensor. Additionally, the 3D detector was used to image diffraction rings produced by a powdered silicon sample, demonstrating the detector's use in a standard synchrotron experiment.	Feb 2010
B16-Test Beamline	Charge sharing in double-sided 3D Medipix2 detectors D. Pennicard , C. Fleta , R. Bates , V. O'shea , C. Parkes , G. Pellegrini , L. Lozano , J. Marchal , N. Tartoni Nuclear Instruments And Methods In Physics Research Section A 412-415 DOI: 10.1016/j.nima.2009.01.095 Show Abstract ▼ Abstract: 3D detectors are photodiode detectors with n- and p-type electrode columns passing through a silicon substrate. This structure gives a much smaller spacing between the electrodes than in a standard photodiode, greatly reducing the detector's operating voltage and collection time. The device structure also reduces charge sharing between adjacent pixels. This improves the image quality, making these detectors potentially useful for applications such as X-ray diffraction experiments in synchrotrons.A set of silicon detectors with a simplified "double-sided" 3D structure have been fabricated. After being bump-bonded to Medipix2 single-photon-counting readout chips, they have been tested using X-rays and alpha particles. The test results show that the 3D detectors have substantially lower charge sharing than a planar detector of the same thickness. (c) 2009 Elsevier B.V. All rights reserved.	Jun 2009

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