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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation I

HK 8.2: Vortrag

Montag, 16. März 2026, 16:45–17:00, PHIL A 301

Development of a gas system for the Transition Radiation Detector of the CBM experiment — •Nikolai Podgornov^1,2, James Ritman^1,2,3, and Peter Wintz³ for the CBM collaboration — ¹Ruhr-Universität Bochum — ²GSI — ³Forschungszentrum Jülich

The Transition Radiation Detector (TRD) of the Compressed Baryonic Matter (CBM) experiment is essential to identify electrons with a momentum p>1 GeV/c with an efficiency of over 90%. The TRD uses a mixture of the noble gas xenon and the quenching gas CO2. Since xenon is an expensive gas, a critical part of the TRD is its gas system, which must maintain a stable and optimal gas mixture to ensure efficient detection of charged particles and transition radiation. Gas mixture purity is also an important factor. This requires a constant flow for purging of the TRD chambers with precisely controlled overpressure maintained within a range of 0.3 - 0.7 mbar. In addition, the system must be closed and ensure complete xenon recovery and purification. This report discusses the status of a gas system prototype and plans for its upgrade toward the full-size system. This includes reassembling the prototype on a new chassis and conducting subsequent long-term leak-tightness and stability tests. An updated piping and instrumentation diagram will be presented, and the control logic will be discussed in the context of migration to a new Programmable Logic Controller suitable for a full-size system. Additionally, a concept for system monitoring based on the Experimental Physics and Industrial Control System (EPICS) will be presented.

Keywords: Compressed Baryonic Matter; Transition Radiation Detector; Gas system