The multi-purpose three-axis spectrometer (TAS) MIRA at FRM II

TL;DR

The MIRA spectrometer at FRM II is a versatile, high-resolution neutron instrument optimized for low-energy excitations, enabling advanced studies of magnetic systems, small samples, and complex materials with rapid adaptability.

Contribution

It introduces a modular, adaptable design with advanced focusing optics and new methods like MIEZE, enhancing capabilities for magnetic and material research.

Findings

High intrinsic Q-resolution for incommensurate magnetic studies

Use of elliptic guides for small sample investigation under extreme conditions

Implementation of the spin-echo technique MIEZE for advanced spectroscopy

Abstract

The cold-neutron three-axis spectrometer MIRA is an instrument optimized for low-energy excitations. Its excellent intrinsic $Q$-resolution makes it ideal for studying incommensurate magnetic systems (elastic and inelastic). MIRA is at the forefront of using advanced neutron focusing optics such as elliptic guides, which enable the investigation of small samples under extreme conditions. Another advantage of MIRA is the modular assembly allowing for instrumental adaption to the needs of the experiment within a few hours. The development of new methods such as the spin-echo technique MIEZE is another important application at MIRA. Scientific topics include the investigation of complex inter-metallic alloys and spectroscopy on incommensurate magnetic structures.