Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Gaseous detectors

T 10.7: Vortrag

Montag, 15. März 2021, 17:30–17:45, Tj

Tracking-TPC for a Belle II Upgrade — Florian Bernlochner, Jochen Dingfelder, Peter Lewis, •Andreas Löschcke Centeno, and Christian Wessel for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

The central drift chamber (CDC) in the Belle II experiment will suffer from large cross-talk effects and high occupancy at full design luminosity of the SuperKEKB accelerator at KEK in Tsukuba, Japan.

In the context of a future upgrade of the Belle II tracking system, the viability of removing the CDC and replacing its outer region with a time projection chamber (TPC) is investigated. This upgrade scenario would see the silicon layers in the inner region being extended into the region not covered by the TPC.

The first-order and conceptual designs are simulated in the Belle II software. Of particular interest are the ion backflow characteristics and the event overlap in the TPC.

Due to the high design luminosity at Belle II there will be a large overlap in physics events due to the long drift time compared to the event rate.

Beam background contributions are dominant in the number of hits in the TPC volume. While a solid background rejection is part of tracking studies not conducted in this project, it is outlined here how the beam-induced background complicates tracking in the TPC.