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arXiv · 2403.01052

Long-Distance Signal Propagation in AC-LGAD

Casey Bishop·Ayan Das·Jane Ding·Matthew Gignac·Forest Martinez-McKinney·Simone M. Mazza·Adam Molnar·Noah Nagel·Mohammad Nizam·Jennifer Ott·Hartmut F. -W. Sadrozinski·Bruce Schumm·Abraham Seiden·Taylor Shin·Andrew Summerell·Max Wilder·Yuzhan Zhao
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Abstract

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

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Casey Bishop, Ayan Das, Jane Ding, Matthew Gignac, Forest Martinez-McKinney, Simone M. Mazza, Adam Molnar, Noah Nagel, Mohammad Nizam, Jennifer Ott, Hartmut F. -W. Sadrozinski, Bruce Schumm, Abraham Seiden, Taylor Shin, Andrew Summerell, Max Wilder, Yuzhan Zhao. 2024-03-02. Long-Distance Signal Propagation in AC-LGAD. https://arxiv.org/abs/2403.01052

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