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SENSEI’s ability to precisely count the number of electrons in a pixel has a significant and immediate impact on searches for rare events. For example, dark matter can scatter off bound electrons in the silicon CCD, creating one or more free electrons. SENSEI can measure these tiny depositions of electric charge in each pixel allowing for unprecedented sensitivity.

Background
A primary goal of particle physics research today is to identify the dark matter particles that make up 85% of the Universe’s matter. Hidden-sector dark matter (including axion-like particles) with eV-to-GeV masses is a rich but remarkably under-explored possibility that has been receiving increased attention in the last few years. Moreover, several model scenarios exist with sharp theory targets in parameter spaces. New ultra-sensitive detectors are required to probe these models

Detection technology
The SENSEI sensors were developed at Lawrence Berkeley National Laboratory MicroSystems Lab as part of the LBL Laboratory Directed Research and Development Program. The sensor are 200 μm thick and is composed of 15μm×15μm square pixels arranged in a 4126 × 866 array.