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arXiv 1703.09883physics.ins-detastro-ph.IMhep-exnucl-ex
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基于CCD读出的GEM型TPC中$^{55}$Fe电子径迹成像

Imaging $^{55}$Fe Electron Tracks in a GEM-based TPC Using a CCD Readout

N. S. Phan, E. R. Lee, D. Loomba

AI总结:

本文首次利用光学读出TPC和GEM/THGEM放大器件,在低压CF$_4$气体中实现了5.9 keV电子径迹的成像与能谱测量,为暗物质探测和X射线偏振测量提供了重要工具。

摘要:

首次展示了利用光学读出时间投影室(TPC)对$^{55}$Fe X射线相互作用产生的5.9 keV电子径迹进行分辨成像的结果。同时给出了相应的能谱,其半高全宽(FWHM)能量分辨率在30-40%范围内,具体取决于气体压强和增益。这些径迹在低压四氟化碳(CF$_4$)气体中产生,并使用快速镜头和低噪声CCD相机系统,利用GEM/THGEM放大器件中产生的次级闪烁光进行成像。GEM/THGEM在25-100 Torr低压范围的CF$_4$中提供了$\gtrsim 2 \times 10^5$的有效气体增益。分辨如此低能量粒子径迹的能力在暗物质搜索和其他稀有事件探测以及X射线偏振测量中具有重要应用。$^{55}$Fe光学信号的一个实际应用是它为映射探测器增益空间均匀性提供了一种工具。

英文摘要:

Images of resolved 5.9 keV electron tracks produced from $^{55}$Fe X-ray interactions are presented for the first time using an optical readout time projection chamber (TPC). The corresponding energy spectra are also shown, with the FWHM energy resolution in the 30-40\% range depending on gas pressure and gain. These tracks were produced in low pressure carbon tetrafluoride (CF$_4$) gas, and imaged with a fast lens and low noise CCD camera system using the secondary scintillation produced in GEM/THGEM amplification devices. The GEM/THGEMs provided effective gas gains of $\gtrsim 2 \times 10^5$ in CF$_4$ at low pressures in the 25-100 Torr range. The ability to resolve such low energy particle tracks has important applications in dark matter and other rare event searches, as well as in X-ray polarimetry. A practical application of the optical signal from $^{55}$Fe is that it provides a tool for mapping the detector gain spatial uniformity.

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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