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Proceedings Paper

Scintillating fibers readout by Single Photon Avalanche Diodes (SPAD) for space applications
Author(s): Martino Marisaldi; Alessandro Berra; Francesco Moscatelli; Piera Maccagnani; Claudio Labanti; Fabio Fuschino; Michela Prest; Davide Bolognini; Massimo Ghioni; Ivan Rech; Angelo Gulinatti; Andrea Giudice; Georg Simmerle; Danielo Rubini
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Paper Abstract

We present the design and performances of a radiation detector based on plastic scintillating fibers with doubleside readout by means of large-area Single Photon Avalanche Diodes (SPAD). This can be the basic step toward the realization of a large-area, cost-effective position sensitive detector to be employed in future space gammaray observatories. SPADs are silicon devices operated above the junction breakdown voltage (with the typical overvoltage of 5V), for which a single photon interacting in the active region is sufficient to trigger a selfsustainable avalanche discharge. SPADs can thus be used for the detection of very low light levels with a fast time response around 50ps FWHM for single photon detection, without spectroscopic capabilities. Large-area SPAD (500 μm in diameter) have been designed and fabricated at the CNR-IMM facility, with an intrinsic noise lower than 10kHz at -15°C, and are optically coupled to both ends of 3-meter long scintillating fibers, with the same diameter. Double-side readout is required to operate the devices in coincidence (10ns coincidence window), in order to reduce the rate of false detections to the level of 1Hz. The detectors have been tested with minimum ionizing particles at CERN PS demonstrating a detection efficiency larger than 90% and a moderate position resolution along the fiber due to the difference in time of arrival between the two photodetectors. Radiation hardness tests on SPADs have also been carried out, showing that large-area SPADs can be safely employed in low-inclination low Earth orbits.

Paper Details

Date Published: 25 September 2012
PDF: 9 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84430M (25 September 2012); doi: 10.1117/12.926277
Show Author Affiliations
Martino Marisaldi, INAF/IASF Bologna (Italy)
Alessandro Berra, Univ. degli Studi dell'Insubria (Italy)
Francesco Moscatelli, Istituto per la Microelettronica e Microsistemi, CNR (Italy)
Piera Maccagnani, Istituto per la Microelettronica e Microsistemi, CNR (Italy)
Claudio Labanti, INAF/IASF Bologna (Italy)
Fabio Fuschino, INAF/IASF Bologna (Italy)
Michela Prest, Univ. degli Studi dell'Insubria (Italy)
Davide Bolognini, Univ. degli Studi dell'Insubria (Italy)
Massimo Ghioni, Politecnico di Milano (Italy)
Ivan Rech, Politecnico di Milano (Italy)
Angelo Gulinatti, Politecnico di Milano (Italy)
Andrea Giudice, Micro Photon Devices S.r.l. (Italy)
Georg Simmerle, Micro Photon Devices S.r.l. (Italy)
Danielo Rubini, Italian Space Agency (Italy)

Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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