Long-Distance Signal Propagation in AC-LGAD

• DOI: 10.48550/arxiv.2403.01052
• Publication Date: 2024-03-01
• Authors: Casey Bishop; Ayan Das; Jane Ding; M. Gignac; F. Martinez-Mckinney; Simone M. Mazza; A. Molnar; Noah Nagel; M. Nizam; J. Ott; H. F-W. Sadrozinski; B. A. Schumm; A. Seiden; T. Shin; Andrew Summerell; M. Wilder; Y. Zhao
• Keywords: SIGNAL (programming language)

We investigate the signal propagation in AC-LGAD (aka RSD), which are LGAD with a common N+ layer and segmented AC-coupled readout contacts, by measuring response to IR laser TCT on large selection of strip readout. The interest for this topic derives from realization that while charge sharing between neighboring strips is essential good position resolution, beyond next neighbor generates background signals general detrimental sensor goal low occupancy. Using produced Hamamatsu Photonics (HPK), we evaluate effects variety properties, including geometrical parameters (strip length, width), process like resistivity, coupling capacitance, thickness bulk resolution.