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Simulation studies of beam-induced background and space charge effects on Time Projection Chamber for the CEPC
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DOI：10.1140/epjs/s11734-026-02404-w.png)
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Abstract
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The Time Projection Chamber (TPC) has been selected as the baseline main tracker detector (MTK) for the Circular Electron Positron Collider Reference Detector Technical Design Report (CEPC Ref-TDR). As a lepton collider, the CEPC can provide a cleaner experimental environment compared to hadron colliders. However, a certain amount of background remains unavoidable. The beam-induced background (BIB) is the most important source of space charge in the TPC. Severe space charge effect poses a critical challenge for the TPC operation and degrades its tracking performance. In this paper, we present the space charge density generated in the TPC by two categories of BIB in the CEPC Ref-TDR, together with the corresponding deviations in electron drift paths. Subsequently, we propose several optimization strategies for the Machine-Detector Interface (MDI) region aimed at reducing the space charge density within the TPC. The space charge density can be suppressed significantly, with the maximum value falling below 1 nC/m $$^{3}$$ for both the Higgs (H) and Low Lumi. Z modes of the CEPC. Finally, we present the momentum resolution of the TPC after the MDI region optimization: the resolution degradation is less than 5% under two operation modes.
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