Test of Topmetal-II⁻ in liquid nitrogen for cryogenic temperature TPCs

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• 作者：Shuguang Zou ; Yan Fan ; Mangmang An ; Chufeng Chen ; Guangming Huang ; Jun Liu ; Hua Pei ; Xiangming Sun ; ^{xmsun@phy.ccnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ping Yang ; Dong Wang ; Le Xiao ; Zhen Wang ; Kai Wang ; Wei Zhou
• 关键词：Topmetal ; Pixel ; Low noise sensor ; Cryogenic temperature
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 September 2016
• 年：2016
• 卷：830
• 期：Complete
• 页码：275-278
• 全文大小：1793 K

文摘

Topmetal-II⁻ is a highly pixelated direct charge sensor that contains a 72×72 pixel array of 83 μm 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.