论文标题
分析和验证Digitizer的采样属性与HPGE检测器的能量分辨率之间的关系
Analysis and Verification of Relation between Digitizer's Sampling Properties and Energy Resolution of HPGe Detectors
论文作者
论文摘要
CDEX（中国暗物质实验）旨在检测76GE的wimp（弱相互作用的巨大颗粒）和0VBB（中准双β衰变）。现在，它在CJPL（中国jinping Underground Laboratory）中使用了约10千克HPGE（高纯净锗）探测器。检测器的能量分辨率是通过6-US成型时间的波形的高度光谱计算的。有必要知道数字化处理器的采样属性如何影响能量分辨率。本文将介绍不同采样特性下波形的初步能量分辨率结果。初步结果表明，具有8.25位或更高的钩针（有效数量）可以符合CDEX HPGE检测器的122kev的能量分辨率。基于ADC（模数转换器）量化误差理论，本文还将对CDEX HPGE检测器中的能量分辨率进行定量分析。它将为HPGE探测器的全链低温读数电子设备提供ADC设计的指导。
The CDEX (China Dark matter Experiment) aims at detection of WIMPs (Weakly Interacting Massive Particles) and 0vbb (Neutrinoless double beta decay) of 76Ge. It now uses ~10 kg HPGe (High Purity Germanium) detectors in CJPL (China Jinping Underground Laboratory). The energy resolution of detectors is calculated via height spectrum of waveforms with 6-us shaping time. It is necessary to know how sampling properties of a digitizer effect the energy resolution. This paper will present preliminary energy resolution results of waveforms at different sampling properties. The preliminary results show that the ENOB (effective number of bits) with 8.25-bit or better can meet the energy resolution @122keV of CDEX HPGe detectors. Based on the ADC (Analog-to-Digital Converter) quantized error theory, this paper will also make a quantitative analysis on energy resolution in CDEX HPGe detectors. It will provide guidance for ADC design in full-chain cryogenic readout electronics for HPGe detectors.
