GLAS-PPE/2009-20

Synchrotron tests of 3D Medipix2 and TimePix X-Ray Detectors

Aaron Mac Raighne(1), K. C. Akiba(8), L. Alianelli(2), M. Artuso(10), R. Bates(1), F. Bayer, J. Buytaert(5), P. Collins(4), M. Crossley(5), L. Eklund(1), C. Fleta(3), A. Gallas(5), M. Gandelman(9), M. Gersabeck(1), E.N. Gimenez(2), V. Gligorov(1), T. Huse(6), M. John(7), L. F. Llin(1), M. Lozano(3), D. Maneuski(1), J. Marchal(2), T. Michel(11), M. Nicol(1), G. Pellegrini(3), D. E. Perira(5), R. Plackett(4), V .O'Shea(1), C. Parkes(1), E. Rodrigues(1), K.J.S. Sawhney(2), N. Tartoni(2), P. Vazquez(5)

(1) University of Glasgow, Kelvin Building, Glasgow G12 8QQ, Scotland.
(2) Diamond Light Source Ltd, Oxfordshire, UK.
(3) Instituto de Microelectronica de Barcelona, Barcelona, Spain.
(4) CERN CH-1211, Genève 23, Switzerland.
(5) Facultad de Fisica , University of Santiago de Compostela, Spain.
(6) Dept. of Physics, The University of Liverpool, Liverpool, U.K.
(7) Dept. of Physics, University of Oxford, UK.
(8) Nikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands.
(9) Instituto de Fisica, Univ. Federal do Rio de Janeiro, Brazil.
(10) Syracuse University, Syracuse, NY 13244, U.S.A.
(11) Erlangen Centre for Astroparticle Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany

In this article we report on the use micro-focus synchrotron X-ray radiation and pion beams to compare the detection efficiencies and charge sharing properties of novel 3D detectors to that of the current planar technology. Detector substrates are bump-bonded to the Medipx2 and Timepix chips. 55µm square pixel maps of the detection efficiencies have been produced using X-ray and MIP beams. For X-rays, a drop of 3-4% detection efficiency over the pixel area was found due to the central electrode. The corner electrodes show no degradation in efficiency compared to that of the planar device. For MIPs a drop of 0.5% in efficiency due to the central electrode was observed. Evidence of a considerable reduction in charge sharing in the 3D detectors compared to the planar devices is also shown.


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