Time of Flight Modulation of Intensity by Zero Effort on Larmor

TL;DR

This paper introduces a new MIEZE spectrometer mode for the Larmor instrument at ISIS, enabling high-frequency neutron spin manipulation for improved time resolution in neutron scattering experiments.

Contribution

It presents the development of a MIEZE mode with resonant spin flippers operating up to 3 MHz, expanding the capabilities of neutron spectroscopy at ISIS.

Findings

Achieved modulation frequencies up to 1.03 MHz.

Extended Fourier time range from 0.1 ns to 30 ns.

Demonstrated effective operation at multiple wavelengths.

Abstract

A time of flight Modulation of IntEnsity by Zero Effort (MIEZE) spectrometer mode has been developed for the Larmor instrument at the ISIS pulsed neutron source. The instrument utilizes resonant neutron spin flippers which employ electromagnets with pole shoes, allowing the flippers to operate at frequencies of up to 3 MHz. Tests were conducted at modulation frequencies of 103 kHz, 413 kHz, 826 kHz and 1.03 MHz, resulting in a Fourier time range of ~0.1 ns to 30 ns using wavelength band of 4 {\AA}-11 {\AA}.