Test of Topmetal-II- In Liquid Nitrogen For Cryogenic Temperature TPCs
Abstract
Topmetal-II- is a highly pixelated direct charge sensor that contains a 72×72 pixel array of 83μm pitch size. The key feature of Topmetal-II- is that it can directly collect charges via metal nodes of each pixel to form two-dimensional images of charge cloud distributions. Topmetal-II- was proved to measure charged particles without amplification at room temperature. To measure its performance at cryogenic temperature, a Topmetal-II- sensor is embedded into a liquid nitrogen dewar. The results presented in this paper show that Topmetal-II- can also operate well at this low temperature with a noise (ENC) of 12 e- lower than that at room temperature (13 e-). From the noise perspective, Topmetal-II- is a promising candidate for the next generation readout of liquid argon and xenon Time Projection Chamber (TPC) used in experiments searching for neutrinoless double beta decay and dark matter.
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