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Design of a MAPS readout electronics prototype for BESIII inner tracker

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Abstract

Background

The spatial resolution and the reconstruction efficiency of the main drift chamber of the Beijing Spectrometer III has degraded after more than nine years of operation. An improved new inner drift chamber has been constructed to replace the old chamber in case of the radiation damage. A monolithic active pixel sensor (MAPS) based detector prototype is selected as one of the prototype schemes for the inner chamber upgrade.

Purpose

Design a set of MAPS readout electronics system for the inner drift chamber upgrade. This system can verify the function and performance of the selected MAPS chip and discover the matters needing attention when designing large-scale detectors.

Methods

The electronics system design is composed of three parts. The first part is flexible printed circuit boards (PCBs) assembled with the MAPS chips. The second part is digital readout boards, which are connected to the flexible PCBs via FPGA mezzanine card cables. The digital readout board realizes the configuration of the MAPS chip register, receives and processes the data output by the MAPS chip, and transfers the processed data to the DAQ device. The third part includes a readout control board and two fan-out boards that used to separately fan out the trigger signal and the start signal to all the digital readout boards.

Results and conclusion

A MAPS readout electronics system consisting of five MAPS based detector prototypes is designed. The system can work stably under the electron beam experimental conditions with a frequency up to 2 kHz and energy ranging from 1 to 5 GeV. The system detection efficiency of the electron beam is \(\sim 95\%\), and the spatial resolution is \(\sim 5.3\, \upmu \hbox {m}\) at electron energies of 1 GeV. The design of the electronics system meets the requirements for verifying the performance of the MAPS chips and the technical feasibility of the detector structure.

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Acknowledgements

This work was supported by a Grant from the National Natural Science Foundation of China (No. U1232202).

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Authors and Affiliations

  1. State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing, 100049, China

    Xing-cheng Tian, Xiao-shan Jiang, Jun Hu, Qun Ou Yang, Ming-yi Dong, Chao-yue Qu, Xu-dong Ju, Hong-yu Zhang, Ye Wu & Xiao-xu Lu

  2. University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China

    Xing-cheng Tian, Xiao-shan Jiang, Jun Hu, Qun Ou Yang, Ming-yi Dong, Chao-yue Qu, Hong-yu Zhang, Ye Wu & Xiao-xu Lu

  3. China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Dongguan, 523803, China

    Xing-cheng Tian

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  1. Xing-cheng Tian
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  2. Xiao-shan Jiang
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  3. Jun Hu
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  5. Ming-yi Dong
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  7. Xu-dong Ju
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  9. Ye Wu
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  10. Xiao-xu Lu
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Correspondence to Xing-cheng Tian.

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Tian, Xc., Jiang, Xs., Hu, J. et al. Design of a MAPS readout electronics prototype for BESIII inner tracker. Radiat Detect Technol Methods 4, 241–249 (2020). https://doi.org/10.1007/s41605-020-00174-0

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  • DOI: https://doi.org/10.1007/s41605-020-00174-0

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