Recent measurement results of HPK AC-LGAD sensors for future hadron colliders

ORAL  · Invited

Abstract

Low-Gain Avalanche Diode (LGAD) technology of semiconductor detectors improves the timing resolution suitable for the detection of charged particles in future hadron colliders. We are developing AC-LGAD detectors capable of both high timing (~20ps) and spatial (~o(10)um) resolutions collaborating with HPK.

In this talk, we will focus on the results of detailed measurements of HPK sensors with finely segmented electrodes. Various samples were compared which have several different doping concentrations, active thickness and coupling capacitance of electrodes. Timing resolutions and signal height were evaluated by beta-ray, infra-red laser and 120GeV proton beam. As a result, we have successfully developed a 100um pitch pixel detector with good signal to noise ratio and timing resolution was achieved about 30ps for charged particles.

*We would like to acknowledge Hamamatsu Photonics K.K. for the fabrication of various types of AC-LGAD sensors and the discussions with the personnel have been very inspiring and fruitful. This research was partially supported by Grant-in-Aid for scientific research on advanced basic research (Grant No. 19H05193, 19H04393, 21H0073 and 21H01099) from the Ministry of Education, Culture, Sports, Science and Technology, of Japan as well as the Proposals for the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics from JFY2019 to JFY2023 granted by High Energy Accelerator Research Organization (KEK) and Fermi National Accelerator Laboratory (FNAL). In conducting the present research program, the following facilities have been very important: Research Center for ELectron PHoton Science (ELPH) and Cyclotron Radio Isotope Center (CYRIC) at Tohoku University, National Institutes for Quantum Science and Technology (QST) at Takasaki, and Fermilab Test Beam Facility (FTBF) at Fermi National Accelerator Laboratory (FNAL).

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Publication: • S.Kita, K. Nakamura, T. Ueda, I. Goya, K. Hara "Optimization of capacitively coupled Low Gain Avalanche Diode (AC-LGAD) sensors for precise time and spatial resolution" Nuclear Instruments and Methods in Physics Research Section A, Volume 1048, March 2023, 168009
• S. Kita, K. Nakamura et. al. "Development of AC-LGAD detector with finer pitch electrodes for high energy physics experiment", Proceedings of the 31st International Workshop on Vertex Detectors (VERTEX), submitted.
• Ryan Heller, Christopher Madrid, Artur Apresyan, William K. Brooks, Wei Chen, Gabriele D'Amen, Gabriele Giacomini, Ikumi Goya, Kazuhiko Hara, Sayuka Kita, Sergey Los, Adam Molnar, Koji Nakamura, Cristián Peña, Claudio San Martín, Alessandro Tricoli, Tatsuki Ueda, Si Xie, "Characterization of BNL and HPK AC-LGAD sensors with a 120 GeV proton beam", Journal of Instrumentation, Volume 17, May 2022

Presenters

  • Sayuka Kita

    • University of Tsukuba

Authors

  • Sayuka Kita

    • University of Tsukuba

  • Koji Nakamura

    • High Energy Accelerator Research Organization (KEK)
    • KEK, High Energy Accelerator Research Organization

  • Tomoka Imamura

    • University of Tsukuba

  • Kazuhiko Hara

    • University of Tsukuba

  • Artur Apresyan

    • Fermi National Accelerator Laboratory

  • Christopher Madrid

    • Fermi National Accelerator Laboratory

  • Ryan Heller

    • Lorents Berkeley National Laboratory

  • Irene Dutta

    • Fermi National Accelerator Laboratory