Variably polarized X-ray sources for LPD calibration

Xie, Yanjun; Liu, HB; Xie, Fei; Wang, Hui; Chen, Ran; Liu, Qian; Yi, Deer; Liang, En‐Wei

doi:10.1007/s10686-023-09905-9

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The X-ray source employed in the experiment is a soft X-ray polarized calibration platform, operating based on Bragg's Law and Fresnel's Law [13]. This platform is designed to generate monochromatic and fully polarized X-rays, specifically catering to the calibration needs of polarization detectors.…”

Section: Methods For Measuring Position Resolutionmentioning

confidence: 99%

“…The Gas Microchannel Plate Pixel Detector (GMPD) is designed based on the photoelectric effect principle, specifically for X-ray polarization measurements [9]. It is tailored for missions like the Cosmic X-ray Polarization Detector (CXPD) CubeSat [10,11], the Low Energy Polarimeter Detector (LPD) [12,13], and the Chasing All Transients Constellation Hunters (CATCH) [14,15]. The primary objective is to achieve measurements of X-ray polarization, energy, and imaging in space.…”

Section: Introductionmentioning

confidence: 99%

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The position resolution of the Gas Microchannel plate Pixel Detector

Feng,

Liu,

Wang

et al. 2024

J. Inst.

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The Gas Microchannel plate Pixel Detector (GMPD) is purposefully designed and manufactured for astrophysical X-ray polarization detection, slated for use in various space missions such as the Cosmic X-ray Polarization Detector (CXPD) CubeSat, Low Energy Polarimeter Detector (LPD/POLAR-2), and the Chasing All Transients Constellation Hunters (CATCH). Past research has explored the polarization and spectral performance of GMPD. This study, for the first time, experimentally investigates its imaging characteristics to validate its imaging capabilities. Utilizing a deconvolution method, we measured the position resolution of GMPD, revealing distinctions in the detector's imaging capabilities for X-rays of varying energies and in orthogonal directions. These research findings will provide targeted insights for optimizing the photoelectron track reconstruction algorithm and correcting systematic effects in polarization measurements for future applications of GMPD.

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Section: Methods For Measuring Position Resolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The position resolution of the Gas Microchannel plate Pixel Detector

Feng,

Liu,

Wang

et al. 2024

J. Inst.

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“…LPD is an innovative soft X-ray polarization detector with a wide FoV (the definition of FoV is shown in Figure 3), utilizing the Gas Microchannel Plate Pixel Detector (GMPD) array (Feng et al 2023a(Feng et al , 2023bXie et al 2023). It was proposed by Guangxi University in China.…”

Section: The Polar-2 Mission and Lpdmentioning

confidence: 99%

In-orbit Background and Sky Survey Simulation Study of POLAR-2/LPD

Feng 冯,

Liu,

Xie

et al. 2023

ApJ

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The Low-Energy X-ray Polarization Detector (LPD) is one of the payloads in the POLAR-2 experiment, designed as an external payload for the China Space Station deployment in early 2026. LPD is specifically designed to observe the polarization of gamma-ray burst (GRB) prompt emission in the energy range of 2–10 keV, with a wide field of view (FoV) of 90° in preliminary design. This observation is achieved using an array of X-ray photoelectric polarimeters based on gas pixel detectors. Due to the wide FoV configuration, the in-orbit background count rate in the soft X-ray range is high, while GRBs themselves also exhibit high flux in this energy band. In order to assess the contribution of various background components to the total count rate, we conducted detailed simulations using the GEANT4 C++ package. Our simulations encompassed the main interactions within the instrument materials and provided insights into various background components within the wide-FoV scheme. The simulation results reveal that among the background components, the primary contributors are the cosmic X-ray background (CXB) and bright X-ray sources. The total background count rate of LPD, after applying the charged particle background rejection algorithm, is approximately 0.55 counts cm–2 s–1 on average, and it varies with the detector’s orbit and pointing direction. Furthermore, we performed comprehensive simulations and comparative analyses of the CXB and X-ray bright sources under different FoVs and detector pointings. These analyses provide valuable insights into the background characteristics for soft X-ray polarimeter with wide FoV.

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X-ray-driven multi-bit quantum random number generator

Lin,

Feng,

et al. 2024

Opt. Express

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Random numbers are vital in cryptography, simulation modeling, and gambling. This study presents a scheme for a multi-bit quantum random number generator utilizing X-ray radiation. Using a homemade multi-pixel single-photon detector array, we extract randomness from three modes of X-ray radiation: arrival time, spatial position, and polarization direction. We employ the Toeplitz Matrix Hashing extractor for randomness distillation, resulting in the extraction of 40.4 million random bits at a rate of 33.7 bits per photon. The generated random numbers pass all test criteria in the National Institute of Standards and Technology statistical test suite. Our work paves what we believe to be a novel method for generating multi-bit quantum random numbers, promising enhanced security and reliability in various technological applications.

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Variably polarized X-ray sources for LPD calibration

Cited by 3 publications

References 15 publications

The position resolution of the Gas Microchannel plate Pixel Detector

The position resolution of the Gas Microchannel plate Pixel Detector

In-orbit Background and Sky Survey Simulation Study of POLAR-2/LPD

X-ray-driven multi-bit quantum random number generator

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