A High-frequency, Low-power Resonant Radio-frequency Neutron Spin Flipper for High-resolution Spectroscopy

arXiv - PHYS - Instrumentation and Detectors Pub Date : 2024-08-05 DOI:arxiv-2408.02438

Sam McKay, Stephen J. Kuhn, Jiazhou Shen, Fankang Li, Jak Doskow, Gerard Visser, Steven R. Parnell, Kaleb Burrage, Fumiaki Funama, Roger Pynn

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Abstract

We present a resonant-mode, transverse-field, radio-frequency (rf) neutron spin flipper design that uses high-temperature superconducting films to ensure sharp transitions between uniform magnetic field regions. Resonant mode allows for low power, high frequency operation but requires strict homogeneity of the magnetic fields inside the device. This design was found to efficiently flip neutrons at 96.6$\pm 0.6\%$ at an effective frequency of 4 MHz with a beam size of $2.5~\times~2.5$~cm and a wavelength of 0.4 nm. The high frequency and efficiency enable this device to perform high-resolution neutron spectroscopy with comparable performance to currently implemented rf flipper designs. The limitation of the maximum frequency was found due to the field homogeneity of the device. We numerically analyze the maximum possible efficiency of this design using a Bloch solver simulation with magnetic fields generated from finite-element simulations. We also discuss future improvements of the efficiency and frequency to the design based on the experimental and simulation results.

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用于高分辨率光谱学的高频、低功率共振射频中子自旋翻转器

我们提出了一种共振模式、横向磁场、射频（rf）中子旋片翻转器设计，它使用高温超导薄膜来确保均匀磁场区域之间的清晰转换。谐振模式允许低功耗、高频率运行，但要求器件内部的磁场严格均匀。研究发现，这种设计可以在 4 MHz 有效频率、2.5~times~2.5$~cm 的光束尺寸和 0.4 nm 的波长条件下，以 96.6$\pm 0.6\%$ 的速度高效地翻转中子。高频率和高效率使这一装置能够进行高分辨率的中子光谱分析，其性能可与目前实施的射频翻转器设计相媲美。最大频率的限制是由于器件的场均匀性造成的。我们使用布洛赫求解器模拟，并利用有限元模拟生成的磁场，对这一设计的最大可能效率进行了数值分析。根据实验和模拟结果，我们还讨论了该设计未来在效率和频率方面的改进。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Instrumentation and Detectors

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