Simulation study of energy resolution with changing pixel size for radon monitor based on Topmetal-II– TPC

doi:10.1007/s41365-018-0532-8

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (1): 16 doi: 10.1007/s41365-018-0532-8

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles Next Articles

Simulation study of energy resolution with changing pixel size for radon monitor based on Topmetal-II^– TPC

Meng-Yao Huang¹ • Hua Pei² • Xiang-Ming Sun² • Shu-Guang Zou³

¹ Department of Physics and Astronomy, Iowa State University, Ames, IA 50010, USA
² PLAC, Key Laboratory of Quark & Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China
³ College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China

Received:2018-06-18 Revised:2018-08-28 Accepted:2018-09-09
Contact: Meng-Yao Huang Xiang-Ming Sun E-mail:mengyaoh@iastate.edu， xmsun@phy.ccnu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (No. U1732271).

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Meng-Yao Huang, Hua Pei, Xiang-Ming Sun, Shu-Guang Zou. Simulation study of energy resolution with changing pixel size for radon monitor based on Topmetal-II^– TPC.Nuclear Science and Techniques, 2019, 30(1): 16 doi: 10.1007/s41365-018-0532-8

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Abstract

Abstract: In this paper, we study how pixel size influences energy resolution for a proposed pixelated detector—a high sensitivity, low cost, and real-time radon monitor based on a Topmetal-II^- time projection chamber (TPC). This monitor was designed to improve spatial resolution for detecting radon alpha particles using Topmetal-II^- sensors assembled by a 0.35 lm CMOS integrated circuit process. Owing to concerns that small pixel size might have the side effect of worsening energy resolution due to lower signalto- noise ratio, a Geant4-based simulation was used to investigate the dependence of energy resolution on pixel sizes ranging from 60 to 600 lm. A non-monotonic trend in this region shows the combined effect of pixel size and threshold on pixels, analyzed by introducing an empirical expression. Pixel noise contributes 50 keV full-width at half-maximum energy resolution for 400 lm pixel size at 1–4σ threshold that is comparable to the energy resolution caused by energy fluctuations in the TPC ionization process (~ 20 keV). The total energy resolution after combining both factors is estimated to be 54 keV for a pixel size of 400 lm at 1–4σ threshold. The analysis presented in this paper would help choosing suitable pixel size for future pixelated detectors.

Key words: Geant4, Energy resolution, Pixel size, Radon monitor, Topmetal

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Simulation study of energy resolution with changing pixel size for radon monitor based on Topmetal-II^– TPC

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