A simple system for measuring the transmittance curve of x-ray filters at low x-ray energies

Jiewei Cao; Tianxiang Chen; Huilin He; Yupeng Xu; Xingzhu Cui; Na Gao; Xiongwei Xu

doi:10.1063/5.0092107

A simple system for measuring the transmittance curve of x-ray filters at low x-ray energies

Rev Sci Instrum. 2022 Dec 1;93(12):123101. doi: 10.1063/5.0092107.

Authors

Jiewei Cao¹, Tianxiang Chen¹, Huilin He¹, Yupeng Xu¹, Xingzhu Cui¹, Na Gao¹, Xiongwei Xu²

Affiliations

¹ Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, China.
² Changchun University of Science and Technology, 130013 Jilin, China.

PMID: 36586904
DOI: 10.1063/5.0092107

Abstract

To prevent the x-ray detectors from the interference of optical photons, x-ray filters are widely used in x-ray space missions. As the flux of low energy x-rays would be significantly attenuated by the filters, it is important to derive the transmittance of the filters below 10 keV. In this paper, we present a simple experimental apparatus and data processing method to measure the transmittance curve of x-ray filters in the energy range from 1.6 to 10 keV. The measured spectra were further processed with Geant4 Monte Carlo simulation results and a direct demodulation algorithm. The obtained transmittance is in good accordance with the theoretical calculation and the synchrotron radiation test result, which proves that the proposed system with the algorithm is a reasonable way to characterize the x-ray transmittance performance of filters above 1.6 keV.