# Instrumental Resolution of the Chopper Spectrometer 4SEASONS Evaluated by Monte Carlo Simulation

## TL;DR

This paper uses Monte Carlo simulations to evaluate and visualize the instrumental resolution of the 4SEASONS spectrometer, enhancing data analysis capabilities.

## Contribution

The study introduces new simulation functionalities in Utsusemi for better visualization and prediction of the spectrometer's resolution function.

## Key findings

- Simulations agree well with analytical calculations
- Enhanced visualization of resolution functions implemented
- Predictive capabilities for experimental configurations added

## Abstract

We performed simulations of the resolution function of the 4SEASONS spectrometer at J-PARC by using the Monte Carlo simulation package McStas. The simulations showed reasonably good agreement with analytical calculations of energy and momentum resolutions by using a simplified description. We implemented new functionalities in Utsusemi, the standard data analysis tool used in 4SEASONS, to enable visualization of the simulated resolution function and predict its shape for specific experimental configurations.