Polarization Reconstruction Study of Wide Field-of-view Photoelectric Polarimeter for POLAR-2/LPD

Polarization Reconstruction Study of Wide Field-of-view Photoelectric Polarimeter for POLAR-2/LPD

The Low-Energy X-ray Polarization Detector (LPD) is one of the payloads in the POLAR-2 experiment, which is planned as an external payload for deployment on the China Space Station in 2026. The LPD is specifically designed to observe the polarization of gamma-ray burst prompt emissions in the energy...

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Main Authors: Zu-Ke Feng, Hong-Bang Liu, Di-Fan Yi, Li-Rong Xie, Cong Dai, Huan-Bo Feng, Jian-Chao Sun, Jiang He, Yuan-Hao Wang, Rui-Ting Ma, Bin-Long Wang, Qian-Nan Mai, Jiang-Chuan Tuo, Qian Zhong, Zhen-Yu Tang, Qian Liu, Fei Xie, Shuang-Nan Zhang, En-Wei Liang
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astrophysical Journal Supplement Series
Subjects:
Gamma-ray bursts
Polarimeters
Astronomical instrumentation
Online Access:https://doi.org/10.3847/1538-4365/ad9470
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Summary:The Low-Energy X-ray Polarization Detector (LPD) is one of the payloads in the POLAR-2 experiment, which is planned as an external payload for deployment on the China Space Station in 2026. The LPD is specifically designed to observe the polarization of gamma-ray burst prompt emissions in the energy range of 2–10 keV, with a preliminary design featuring a wide field-of-view (FOV) of ±45°. This observation is achieved using an array of X-ray photoelectric polarimeters. Because of the wide FOV design of the detector, nearly all photons impinge on the detector off-axis. This paper investigates the polarization reconstruction of a photoelectric polarimeter for off-axis photons. It was found that the reconstruction of the emission azimuthal angles of photoelectron tracks is the main factor affecting the shape of the modulation function for off-axis radiation. Therefore, a modulation function correction method based on Monte Carlo (MC) simulation is proposed. This MC simulation-based method is applied to both simulated and experimental data to correct the modulation function for off-axis radiation. The reconstruction results demonstrate that this method can accurately determine the polarization degree and polarization angle of photons under different conditions. While we tested up to 45° off-axis angles due to our ±45° FOV, the method is theoretically applicable to off-axis angles up to ∼90°.
ISSN:0067-0049

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