Spatial resolution measurement of Triple-GEM detector and diffraction imaging test at synchrotron radiation

TL;DR

This paper presents a high-resolution triple-GEM detector tested for diffraction imaging at synchrotron radiation, demonstrating its effectiveness in spatial resolution, energy resolution, and imaging capabilities for powder diffraction experiments.

Contribution

The study introduces a novel two-dimensional readout triple-GEM detector optimized for synchrotron diffraction imaging, with comprehensive lab and synchrotron testing results.

Findings

Spatial resolution of ~110 um FWHM achieved

Energy resolution better than 27% at 5.9 keV

Successful diffraction imaging of SiO2 powder at BSRF

Abstract

A triple-GEM detector with two-dimensional readout is developed. The detector provides high position resolution for powder diffraction experiments at synchrotron radiation. Spatial resolution of the detector is measured in the lab using a 55Fe X-ray source. A resolution of about 110 um FWHM is achieved. The energy resolution is better than 27% for 5.9 keV X-rays. The detector's validity under illumination of photons in particular energy range is verified using a Cu X-ray tube. Imaging of the head of a wire stripper with X-ray tube demonstrates its imaging ability. A diffraction imaging experiment using the sample of powder SiO2 is successfully carried out at 1W2B laboratory of Beijing Synchrotron Radiation Facility (BSRF). Different diffraction rings are clearly seen under various X-ray energies.