ADC Nonlinearity Correction for the Majorana Demonstrator
ADC Nonlinearity Correction for the Majorana Demonstrator
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DOI：
10.1109/tns.2020.3043671
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发表时间：
2021-03-01
影响因子：
1.8
通讯作者：
Shanks, B.
中科院分区：
文献类型：
--
作者：
Abgrall, N.;Allmond, J. M.;Shanks, B.
当信号数字化要求宽动态范围和高分辨率时，模数转换（ADC）的缺陷不可忽视，例如MAJORANA DEMONSTRATOR Ge-76中微子双β衰变搜索。为了实现实验的高分辨率光谱分析和有效的脉冲形状识别，需要仔细测量和校正ADC非线性。开发了一种简单的测量方案，不需要复杂的设备或冗长的数据采集活动。观察和表征了斜率相关的滞后。在信号处理之前，对数字化波形进行校正，将微分和积分非线性降低了一个数量级，消除了这些对双β衰减Q值的系统能量不确定性的主要贡献。
Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the MAJORANA DEMONSTRATOR Ge-76 neutrinoless double-beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC nonlinearities. A simple measurement protocol was developed that did not require sophisticated equipment or lengthy data-taking campaigns. A slope-dependent hysteresis was observed and characterized. A correction applied to digitized waveforms prior to signal processing reduced the differential and integral nonlinearities by an order of magnitude, eliminating these as dominant contributions to the systematic energy uncertainty at the double-beta decay Q value.