Speaker
Description
4H-SiC is a promising material for future collider timing and tracking detectors because of its high carrier saturation velocity, low leakage current, and thermal stability. We present recent progress on 4H-SiC Low Gain Avalanche Detectors (LGADs) developed by LBNL, NCSU and BNL, covering gain-layer optimization and the first AC-coupled 4H-SiC LGADs.
We studied how gain-layer doping affects timing performance. The best time resolution occurs at moderate gain (about 20–50), where the transition from electronic-noise-dominated jitter to multiplication shot noise sets the optimum operating point. And We present the first experimental demonstration of 4H-SiC AC-coupled Low Gain Avalanche Detectors (AC-LGADs) for 4D tracking, which provide simultaneous precision timing and position measurement.With conventional DPC and CFD reconstruction, it achieves position and timing resolutions of about 10 µm and 20 ps under UV-TCT. A transformer-based neural network trained on the full waveforms improves these to below 5 µm and about 15 ps. These results establish 4H-SiC AC-LGADs as a promising technology for future 4D tracking detectors.