A Highly Segmented Neutron Polarimeter for A1

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detector...（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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Key words

Neutron polarimeter,Plastic scintillator,FPGA TDC,Time-over-threshold

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