Precision scans of the pixel cell response of double sided 3D pixel detectors to pion and x-ray beams

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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 (2011)
  • Publisher: Institute of Physics Publishing Ltd.
  • Related identifiers: doi: 10.1088/1748-0221/6/05/P05002
  • Subject: Detectors and Experimental Techniques
    arxiv: Physics::Instrumentation and Detectors

Three-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 55 m m 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 10 degrees 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 +/- 0.6 mu m. Charge collection above and below the columnar electrodes in the double-sided 3D sensor is observed.
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