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MacRaighne, A.; Akiba, K.; Alianelli, L.; Bates, R.; van Beuzekom, M.; Buytaert, J.; Campbell, M.; Collins, P.; Crossley, M.; Dumps, R.; Eklund, L.; Fleta, C.; Gallas, A.; Gersabeck, M.; Gimenez, E.N.; Gligorov, V.V.; John, M.; Llopart, X.; Lozano, M.; Maneuski, D.; Marchal, J.; Nicol, M.; Plackett, R.; Parkes, C.; Pellegrini, G.; Pennicard, D.; Rodrigues, E.; Stewart, G.; Sawhney, K.J.S.; Tartoni, N. ... view all 31 authors View less authors (2011)
Publisher: Institute of Physics Publishing Ltd.
Languages: English
Types: Article

Classified by OpenAIRE into

arxiv: Physics::Instrumentation and Detectors
hree-dimensional (3D) silicon sensors offer potential advantages over standard planar sensors for radiation hardness in future high energy physics experiments and reduced charge-sharing for X-ray applications, but may introduce inefficiencies due to the columnar electrodes. These inefficiencies are probed by studying variations in response across a unit pixel cell in a 55μm pitch double-sided 3D pixel sensor bump bonded to TimePix and Medipix2 readout ASICs. Two complementary characterisation techniques are discussed: the first uses a custom built telescope and a 120GeV pion beam from the Super Proton Synchrotron (SPS) at CERN; the second employs a novel technique to illuminate the sensor with a micro-focused synchrotron X-ray beam at the Diamond Light Source, UK. For a pion beam incident perpendicular to the sensor plane an overall pixel efficiency of 93.0±0.5% is measured. After a 10o rotation of the device the effect of the columnar region becomes negligible and the overall efficiency rises to 99.8±0.5%. The double-sided 3D sensor shows significantly reduced charge sharing to neighbouring pixels compared to the planar device. The charge sharing results obtained from the X-ray beam study of the 3D sensor are shown to agree with a simple simulation in which charge diffusion is neglected. The devices tested are found to be compatible with having a region in which no charge is collected centred on the electrode columns and of radius 7.6±0.6μm. Charge collection above and below the columnar electrodes in the double-sided 3D sensor is observed.
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