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Investigation of signal characteristics and charge sharing in AC-LGADs with laser and test beam measurements

Ott, Jennifer and Letts, Sean and Molnar, Adam and Ryan, Eric and Wong, Marcus and Mazza, Simone M. and Nizam, Mohammad and Sadrozinski, Hartmut F.-W. and Schumm, Bruce and Seiden, Abraham and Shin, K.-W. Taylor and Heller, Ryan and Madrid, Christopher and Apresyan, Artur and Brooks, William K. and Chen, Wei and D’Amen, Gabriele and Giacomini, Gabriele and Goya, Ikumi and Hara, Kazuhiko and Kita, Sayuka and Los, Sergey and Nakamura, Koji and Peña, Cristián and San Martin, Claudio and Ueda, Tatsuki and Tricoli, Alessandro and Xie, Si (2023) Investigation of signal characteristics and charge sharing in AC-LGADs with laser and test beam measurements. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1045 . Art. No. 167541. ISSN 0168-9002. doi:10.1016/j.nima.2022.167541.

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AC-LGADs, also referred to as resistive silicon detectors, are a recent development of low-gain avalanche detectors (LGADs), based on a sensor design where the multiplication layer and n⁺ contact are continuous, and only the metal layer is patterned. In AC-LGADs, the signal is capacitively coupled from the continuous, resistive n⁺ layer over a dielectric to the metal electrodes. Therefore, the spatial resolution is not only influenced by the electrode pitch, but also the relative size of the metal electrodes. Signal propagation between the metallized areas and charge sharing between electrodes plays a larger role in these detectors than in conventional silicon sensors read out in DC mode. AC-LGADs from two manufacturers were studied in beam tests and with infrared laser scans. The impact of n⁺ layer resistivity and metal electrode pitch on the charge sharing and achievable position resolution is shown. For strips with 100 µm pitch, a resolution of ¡ 5 µm can be reached. The charge sharing between neighboring strips is investigated in more detail, indicating the induction of signal charge and subsequent re-sharing over the n⁺ layer. Furthermore, an approach to identify signal sharing over large distances is presented.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ott, Jennifer0000-0001-9337-5722
Molnar, Adam0000-0002-5861-262X
Ryan, Eric0000-0001-5323-4116
Wong, Marcus0000-0003-3669-2945
Mazza, Simone M.0000-0003-3865-730X
Nizam, Mohammad0000-0002-8151-2168
Sadrozinski, Hartmut F.-W.0000-0003-0019-5410
Schumm, Bruce0000-0002-5394-0317
Seiden, Abraham0000-0003-4311-8597
Shin, K.-W. Taylor0000-0002-9005-6387
Heller, Ryan0000-0002-7368-6723
Madrid, Christopher0000-0003-3301-2246
Apresyan, Artur0000-0002-6186-0130
Chen, Wei0000-0002-6703-3814
D’Amen, Gabriele0000-0002-9742-3709
Hara, Kazuhiko0000-0003-1629-0535
Kita, Sayuka0000-0002-7246-0570
Los, Sergey0000-0001-8637-5628
Nakamura, Koji0000-0002-1560-0434
Peña, Cristián0000-0002-4500-7930
Tricoli, Alessandro0000-0002-8224-6105
Xie, Si0000-0003-2509-5731
Additional Information:We thank the Fermilab accelerator and FTBF personnel for the excellent performance of the accelerator and support of the test beam facility, in particular M. Kiburg, E. Niner and E. Schmidt. We also thank the SiDet department for preparing the readout boards by mounting and wirebonding the AC-LGAD sensors. Finally, we thank L. Uplegger for developing the telescope tracker and a large part of the DAQ system. This study was conducted using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by the Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. This research is partially funded by the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics, through Department of Energy under FWP 20-32 in the USA, and via High Energy Accelerator Research Organization (KEK) in Japan. This work was also supported by the U.S. Department of Energy under grant DE-SC0010107-005; used resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704; and was supported by the Chilean ANID PIA/APOYO AFB180002 and ANID - Millennium Science Initiative Program - ICN2019-044. 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. J. Ott would like to acknowledge funding from the Finnish Cultural Foundation through the Postdoc Pool of Finnish Foundations.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-07CH11359
Department of Energy (DOE)FWP 20-32
Department of Energy (DOE)DE-SC0010107-005
Department of Energy (DOE)DE-SC0012704
Agencia Nacional de Investigación y Desarrollo (ANID)AFB180002
Agencia Nacional de Investigación y Desarrollo (ANID)ICN2019-044
Ministry of Education, Culture, Sports, Science and Technology (MEXT)19H05193
Ministry of Education, Culture, Sports, Science and Technology (MEXT)19H04393
Ministry of Education, Culture, Sports, Science and Technology (MEXT)21H0073
Ministry of Education, Culture, Sports, Science and Technology (MEXT)21H01099
Finnish Cultural FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20230103-818063100.49
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118640
Deposited By: Research Services Depository
Deposited On:07 Feb 2023 19:45
Last Modified:07 Feb 2023 19:45

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