PSD13: The 13th International Conference on Position Sensitive Detectors

Spatial resolution of IHEP AC-LGADs with different process and structure design

8 Sept 2023, 12:30

20m

St Catherine's Bernard Sunley Building (Oxford)

Talk Position Sensitive Fast Timing Detectors Closing session

Speaker

Mengzhao Li (Chinese Academy of Sciences (CN))

Description

AC-coupled Low- Gain Avalanche Detectors (AC-LGAD) are designed as detectors with 100% fill factor for high precision 4D-tracking, which have been studied and researched by many institutes including BNL、FBK et al. Institute of High Energy Physics (IHEP) has also done many researches on AC-LGAD. First IHEP AC-LGAD sensors with a pitch of 2000 µm and AC pad of 1000 µ show time resolution better than 20ps, and spatial resolution better than 16um. Testing results show that as the N+ doping dose decreases from 10 P to 0.2 P, the spatial resolution is reduced from 33 µm to 15 µm. Details of the results will be discussed. Second version of IHEP AC-LGAD be fabricated, lower than 0.2P n+ layer dose be used for improve the spatial resolution and sensors with different pad-pitch structures also be fabricated. Testing results show that as decreasing the n+ layer dose from 0.2P to 0.02P, the spatial resolution of AC-LGAD can be lower than 8um. Strips with different pad-pitch structures be fabricated and studied, results show that pad-pitch structures will also affect the spatial resolution. Testing results of IHEP AC-LGAD v2 sensors tested by using laser system will also be shown.