Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Instrumentation I

HK 8.3: Talk

Monday, March 16, 2026, 17:00–17:15, PHIL A 301

Measuring the gas tightness of CBM-TRD wire chambers in Node-RED flows — •Philipp Kähler — Institut für Kernphysik, Universität Münster

The Transition Radiation Detector (TRD) in the CBM experiment at FAIR will provide electron identification, enabling the study of the hot and dense medium created in heavy-ion collisions via the measurement of di-electrons at intermediate masses. Furthermore, the TRD will serve as an intermediate tracking station and, moreover, augments the identification of light nuclei for the hypernuclei programme of CBM.

As gaseous detector using a Xe/CO₂ 85:15 gas mixture, the gas loss per detector chamber has to be minimised to not exceed an accepted upper limit of 1 ml/h. To test the corresponding gas tightness is a crucial QA step during serial chamber production for this detector.

In this talk, a new QA test stand for gas tightness assessment based on a direct gas loss measurement is presented. The data acquisition is implemented in Node-RED flows on a Raspberry Pi-based platform, which includes ADCs of corresponding required precision as well as a high automation level of the measurement routines.

Keywords: CBM; FAIR; TRD; MWPC; Automatisation