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A Highly Segmented Neutron Polarimeter for A1

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment(2024)

Johannes Gutenberg Univ Mainz | Univ Zagreb | Clermont Univ | Jozef Stefan Inst

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Abstract
A new neutron polarimeter for measuring the neutron's electric form factor was designed and constructed to complement the A1 spectrometer setup at the Mainz Microtron (MAMI). The design is based on a previous polarimeter with significant improvements to halve the error of the extracted form factor. A higher granularity of the polarimeter sections and a deeper first section on the one hand, and a faster readout employing Time-over-Threshold methods to measure the signal amplitudes combined with a high-precision FPGA-based TDC on the other hand will allow to achieve this goal. The performance of the new polarimeter during a first measurement campaign in 2019 using liquid hydrogen and deuterium targets will be discussed.
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Neutron polarimeter,Plastic scintillator,FPGA TDC,Time-over-threshold
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要点】:本研究设计并构建了一种高度分割的中子偏振仪A1,用于测量中子的电荷形式因子,以补充Mainz Microtron (MAMI)上的A1谱仪设置,其设计基于先前偏振仪并进行了显著改进,将提取形式因子的误差减半。

方法】:新偏振仪采用了更高分段细致度,加深了第一部分,并且利用时间超过阈值的方法测量信号幅度,结合高精度的基于FPGA的TDC,实现了快速读出。

实验】:2019年,使用液氢和重氢靶进行了第一次测量,新的偏振仪的性能将在本文中讨论,数据集名称未提及。