Oscillatory magnetic fields for neutron resonance spin-echo spectroscopy

TL;DR

This paper details the design and implementation of high-frequency oscillatory magnetic fields in neutron resonance spin-echo spectrometers, enabling high-resolution studies of material dynamics.

Contribution

It presents a comprehensive technical setup for resonant circuits capable of operating at frequencies up to 3.6 MHz with broad bandwidth, enhancing neutron spin-echo spectroscopy capabilities.

Findings

Resonant circuits operate up to 3.6 MHz

Broad bandwidth down to 35 kHz achieved

Effective use of signal generators, amplifiers, and tuned components

Abstract

The generation of high frequency oscillatory magnetic fields represents a fundamental component underlying the successful implementation of neutron resonant spin-echo spectrometers, a class of instrumentation critical for the high-resolution extraction of dynamical excitations (structural and magnetic) in materials. In this paper, the setup of the resonant circuits at the longitudinal resonant spin-echo spectrometer RESEDA is described in comprehensive technical detail. We demonstrate that these circuits are capable of functioning at frequencies up to 3.6 MHz and over a broad bandwidth down to 35 kHz using a combination of signal generators, amplifiers, impedance matching transformers, and a carefully designed cascade of tunable capacitors and customized coils.