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A Bragg reflection X-ray polarimeter using curved crystals

Presentation #105.11 in the session Missions and Instruments - Poster Session.

Published onMay 03, 2024
A Bragg reflection X-ray polarimeter using curved crystals

In high-energy celestial objects, many radiations and scatterings occur tracing magnetic field structures or surrounding materials, and then by measuring polarization, it can be possible to obtain such geometric information. However, in the field of X-ray observation, polarization measurement technology lags far behind that of other wavelengths, and there is much room for growth in this area. The objective of this research is to develop an X-ray polarimeter with high X-ray energy resolution and high polarization detection capability using a curved crystal and an imaging sensor. Our X-ray polarimeter consists of a rotating parabolic crystal mirror and an imaging sensor. The system adopts the principle that the reflectance of the Bragg reflection depends on the geometry between the polarization plane and incident angle. The M value, which represents the polarization detection capability of this optical system, is extremely close to 1, which is as high as the efficiency of the Thomson optical system. By daring to defocus the detector, dispersion spectroscopy can be performed at the same time. We have demonstrated that the spectral resolution at 6.4 keV and 8.05 keV are expressed as ∆E/E=5.6/|d|% and ∆E/E=7.2/|d|%, when the distance between the image sensor and the focus is d (< 100) [mm], respectively. We aim to mount this X-ray polarimeter on CubeSat to observe solar flares. In the talk, we will also discuss the application of this reflector to the 1U (10 cm square) size.

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