Speakers
Description
DarkSHINE is a newly proposed fixed-target experiment initiative to search for the invisible decay of Dark Photon via missing momentum signatures, based on the high repetition rate electron beam to be deployed/delivered by the Shanghai High repetition rate XFEL and Extreme light facility (SHINE). Among the various detector subsystems, the tracking system is positioned at the forefront, playing a crucial role in precisely reconstructing charged particle trajectories and identifying missing momentum signatures. The design is optimized to have 13 layers of tracker and requires a spatial resolution of 10 micron given by simulation.
To meet this requirement, the tracking system adopts AC-coupled Low Gain Avalanche Diode (AC-LGAD) sensors, which provide excellent spatial and timing resolution. The prototype sensors with a strip pitch of 100 micron have been developed and tested to have spatial and time resolution of 6.5 to 12.3 micron and 8.3 to 11.4 ps depending on the doping dose of the wafers.
For further validating the performance of AC-LGAD sensors in a realistic experimental environment and optimizing the detector design, we plan to develop a multi-layer sensor prototype with integrated readout system, and employing timing information in tracking reconstruction.
