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arXiv 2510.26239astro-ph.IM
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一种用于硬X射线偏振测量的大面积光学时间投影室,具有低能电子方向成像

A Large-Area Optical Time Projection Chamber for Hard X-ray Polarimetry with Directional Imaging of Low-Energy Electron Recoils

Gran Sasso Science Institute(格兰萨索科学研究所);INFN Laboratori Nazionali del Gran Sasso(意大利国家核物理研究所大萨索国家实验室);INFN Laboratori Nazionali di Frascati(意大利国家核物理研究所弗拉斯卡蒂国家实验室);IAPS - INAF Istituto di Astrofisica e Planetologia Spaziali(空间天体物理学和行星学研究所-意大利国家天体物理研究所)
Davide Fiorina, Elisabetta Baracchini, Giorgio Dho, Paolo Soffitta, Samuele Torelli, David J. M. Marques, Enrico Costa, Sergio Fabiani, Fabio Muleri, Giovanni M… 展开作者

Davide Fiorina, Elisabetta Baracchini, Giorgio Dho, Paolo Soffitta, Samuele Torelli, David J. M. Marques, Enrico Costa, Sergio Fabiani, Fabio Muleri, Giovanni Mazzitelli, Atul Prajapati

AI总结:

该研究开发了一种用于硬X射线偏振测量的大面积光学时间投影室,通过三重GEM放大和光学读出技术,实现了低能电子方向成像,展示了高灵敏度和高调制因子的光电效应偏振测量能力。

摘要:

我们报告了开发一种大体积、宽视场的时间投影室(TPC)用于X射线偏振测量,其特征是三重GEM放大阶段和光学读出。最初是在CYGNO计划中为方向暗物质搜索而开发的系统,该系统使用科学CMOS(sCMOS)相机和光电倍增管(PMT)来收集在电荷放大过程中产生的二次闪烁光。一个具有圆柱形活性体积(半径3.7厘米,高度5厘米)的原型在INAF--IAPS校准设施(罗马,Tor Vergata)进行了测试,以评估对低能电子方向性的灵敏度。我们完全重建了10-60 keV范围内的电子,获得了15°的角分辨率,推断出调制因子高达0.9。这些初步结果表明,在数十keV范围内具有强调制的光电效应偏振测量是可靠的,表明光电效应偏振测量可以扩展到更高能量。这种能力对于快速瞬变(GRBs,日冕爆发)具有前景,并将扩大X射线偏振测量的天体物理范围。

英文摘要:

We report on the development of a large-volume, wide field-of-view time projection chamber (TPC) for X-ray polarimetry, featuring a triple-GEM amplification stage and optical readout. Originally developed within the CYGNO program for directional dark matter searches, the system employs a scientific CMOS (sCMOS) camera and a photomultiplier tube (PMT) to collect secondary scintillation light produced during charge amplification. A prototype with a cylindrical active volume (radius 3.7 cm, height 5 cm) was tested at the INAF--IAPS calibration facility (Rome, Tor Vergata) to assess sensitivity to low-energy electron directionality. We fully reconstruct electrons in the 10-60 keV range, obtain angular resolutions as good as 15°, and infer modulation factors up to 0.9. These first results demonstrate robust photoelectron tracking at tens of keV with strong modulation, indicating that photoelectric-effect polarimetry can be extended to higher energies. This capability is promising for rapid transients (GRBs, solar flares) and would broaden the astrophysical reach of X-ray polarimetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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