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Peer-reviewedCC BYSensors (Basel, Switzerland)

Characterization of a Resistively Multiplexed SiPM Readout for Position-Sensitive Scintillating Fibre Radiation Detectors.

  • Klemen Žagar1,2
  • Gregor Košir1
  • Matjaž Vencelj1,3
  • Eva Lovšin1,3
  • Tobe Mulder1,3
  • Jürgen Gerl4
  • Hao Huang5
  • Guang-Shun Li5
  • Jelena Vesić1
  • FIMP Collaboration
5 affiliations
  1. 1Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
  2. 2Jožef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia.
  3. 3Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia.
  4. 4FAIR GmbH, Planckstraße 1, 64291 Darmstadt, Germany.
  5. 5Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Rd., Lanzhou 730000, China.
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Abstract

Active stoppers based on scintillating fibres provide fast signal formation, fine segmentation and compact geometry. On the other hand, their implementation requires a readout that can handle many silicon photomultiplier channels and a wide range of light intensities. We present a laboratory characterization of a resistively multiplexed SiPM readout for the Fibre IMPlanter concept. The readout combines 16 SiPM input nodes into four analog outputs. Localized pulsed light excitation was used to scan individual SiPM positions, and the four signals were processed by baseline subtraction, charge integration and normalized charge division reconstruction. In an intermediate signal range, the reconstructed position plane shows distinguishable clusters for the individual inputs, indicating that spatial information is retained after a factor-of-four reduction in readout channels. At low amplitudes, the reconstruction is limited by baseline noise and reduced signal-to-noise ratio. At high amplitudes, the energy proxy signal response is affected by SiPM non-linearity and finite microcell occupancy, while position reconstruction accuracy is limited by distortions of the charge sharing. The results identify the signal range in which resistive multiplexing remains a practical compact readout option for SiPM-based scintillating fibre radiation detectors.

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Cite

BibTeXRIS
BibTeX
@article{zagar2026characterization,
  title = {{Characterization of a Resistively Multiplexed SiPM Readout for Position-Sensitive Scintillating Fibre Radiation Detectors.}},
  author = {Klemen Žagar and Gregor Košir and Matjaž Vencelj and Eva Lovšin and Tobe Mulder and Jürgen Gerl and Hao Huang and Guang-Shun Li and Jelena Vesić and FIMP Collaboration},
  journal = {Sensors (Basel, Switzerland)},
  year = {2026},
  month = oct,
  doi = {10.3390/s26206531},
  url = {https://europepmc.org/article/MED/42944394},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Characterization of a Resistively Multiplexed SiPM Readout for Position-Sensitive Scintillating Fibre Radiation Detectors.
AU  - Klemen Žagar
AU  - Gregor Košir
AU  - Matjaž Vencelj
AU  - Eva Lovšin
AU  - Tobe Mulder
AU  - Jürgen Gerl
AU  - Hao Huang
AU  - Guang-Shun Li
AU  - Jelena Vesić
AU  - FIMP Collaboration
PY  - 2026
DA  - 2026/10/15
JO  - Sensors (Basel, Switzerland)
DO  - 10.3390/s26206531
UR  - https://europepmc.org/article/MED/42944394
AB  - Active stoppers based on scintillating fibres provide fast signal formation, fine segmentation and compact geometry. On the other hand, their implementation requires a readout that can handle many silicon photomultiplier channels and a wide range of light intensities. We present a laboratory characterization of a resistively multiplexed SiPM readout for the Fibre IMPlanter concept. The readout combines 16 SiPM input nodes into four analog outputs. Localized pulsed light excitation was used to scan individual SiPM positions, and the four signals were processed by baseline subtraction, charge integration and normalized charge division reconstruction. In an intermediate signal range, the reconstructed position plane shows distinguishable clusters for the individual inputs, indicating that spatial information is retained after a factor-of-four reduction in readout channels. At low amplitudes, the reconstruction is limited by baseline noise and reduced signal-to-noise ratio. At high amplitudes, the energy proxy signal response is affected by SiPM non-linearity and finite microcell occupancy, while position reconstruction accuracy is limited by distortions of the charge sharing. The results identify the signal range in which resistive multiplexing remains a practical compact readout option for SiPM-based scintillating fibre radiation detectors.
SN  - 1424-8220
ER  -