The performance of large-pitch AC-LGAD with different N+ dose

—AC-Coupled LGAD (AC-LGAD) is a new 4D detec- tor developed based on the Low Gain Avalanche Diode (LGAD) technology, which can accurately measure the time and spatial information of particles. Institute of High Energy Physics (IHEP) designed a large-size AC-LGAD with a pitch of 2000 µ m and AC pad of 1000 µ m , and explored the effect of N+ layer dose on the spatial resolution and time resolution. The spatial resolution varied from 32.7 µ m to 15.1 µ m depending on N+ dose. The time resolution does not change significantly at different N+ doses, which is about 15-17 ps. AC-LGAD with a low N+ dose has a large attenuation factor and better spatial resolution. Large signal attenuation factor and low noise level are beneficial to improve the spatial resolution of the AC-LGAD sensor.

[1]  G. Kramberger,et al.  Design and testing of LGAD sensor with shallow carbon implantation , 2022, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.

[2]  A. Apresyan,et al.  Characterization of BNL and HPK AC-LGAD sensors with a 120 GeV proton beam , 2022, Journal of Instrumentation.

[3]  Zhijun Liang,et al.  The Timing Resolution of IHEP-NDL LGAD Sensors With Different Active Layer Thicknesses , 2021, IEEE Transactions on Nuclear Science.

[4]  A. Apresyan,et al.  Resistive AC-Coupled Silicon Detectors: Principles of operation and first results from a combined analysis of beam test and laser data , 2020, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.

[5]  R. Arcidiacono,et al.  Demonstration of 200-, 100-, and 50- $\mu$ m Pitch Resistive AC-Coupled Silicon Detectors (RSD) With 100% Fill-Factor for 4D Particle Tracking , 2019, IEEE Electron Device Letters.

[6]  A. Tricoli,et al.  Fabrication and performance of AC-coupled LGADs , 2019, Journal of Instrumentation.

[7]  J. T. Childers,et al.  FCC-ee: The Lepton Collider , 2019, The European Physical Journal Special Topics.

[8]  I. Vila,et al.  Radiation Tolerance of Proton-Irradiated LGADs , 2018, IEEE Transactions on Nuclear Science.

[9]  S. Grinstein,et al.  Radiation hardness of thin Low Gain Avalanche Detectors , 2017, 1711.06003.

[10]  H. Sadrozinski,et al.  4D tracking with ultra-fast silicon detectors , 2017, Reports on progress in physics. Physical Society.

[11]  F. Cenna,et al.  Beam test results of a 16 ps timing system based on ultra-fast silicon detectors , 2016, 1608.08681.