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<b>Purpose</b> <p>Background removal is an important issue in data reduction for the follow-up X-ray telescope (FXT) onboard the Einstein Probe (EP), particularly for the particle-induced background. They appear in various charge patterns in the focal plane PN-CCD, such as straight tracks, isolated showers and broad rectangular swathes.</p> <b>Methods</b> <p>We use the data obtained with the FXT mirror assembly covered, which are due to particle-induced background, to study the methods for rejecting such background.</p> <b>Results</b> <p>The particle-induced background in the FXT comprises background directly caused by particles, as well as instrument events that are also due to particles. A new rejection method, which involves cluster identification, and threshold veto for number of hits in rows and columns, is applied to remove the particle-induced background. The remaining background can be eliminated by the event reconstruction algorithm and event veto in subsequent FXT data reduction.</p> <b>Conclusion</b> <p>It is shown that their methods can achieve a background rejection efficiency of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41605_2025_528_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\(&gt;99.8\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>&gt;</mo> <mn>99.8</mn> </mrow> </math></EquationSource> </InlineEquation>&#xa0;%. Additionally, there has been a notable decrease in the number of spikes in the light curves of the FXT. Furthermore, we found the instrument background is attributed to a combination of particles and CAMEX electronics.</p>

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Particle-induced background rejection method for the follow-up X-ray telescope onboard Einstein probe

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Hai-Sheng Zhao,
  • Xiao-Fan Zhao,
  • Ju Guan,
  • Juan Zhang,
  • Cheng-Kui Li,
  • Shu-Mei Jia,
  • Yong Chen,
  • Jing-Jing Xu,
  • Da-Wei Han,
  • Li-Ming Song,
  • Jin Wang,
  • Wei-Wei Cui

摘要

Purpose

Background removal is an important issue in data reduction for the follow-up X-ray telescope (FXT) onboard the Einstein Probe (EP), particularly for the particle-induced background. They appear in various charge patterns in the focal plane PN-CCD, such as straight tracks, isolated showers and broad rectangular swathes.

Methods

We use the data obtained with the FXT mirror assembly covered, which are due to particle-induced background, to study the methods for rejecting such background.

Results

The particle-induced background in the FXT comprises background directly caused by particles, as well as instrument events that are also due to particles. A new rejection method, which involves cluster identification, and threshold veto for number of hits in rows and columns, is applied to remove the particle-induced background. The remaining background can be eliminated by the event reconstruction algorithm and event veto in subsequent FXT data reduction.

Conclusion

It is shown that their methods can achieve a background rejection efficiency of \(>99.8\) > 99.8  %. Additionally, there has been a notable decrease in the number of spikes in the light curves of the FXT. Furthermore, we found the instrument background is attributed to a combination of particles and CAMEX electronics.