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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation und Anwendungen II

HK 26.4: Vortrag

Dienstag, 11. März 2008, 12:00–12:15, 2D

Systematic studies on the rate capability of MWPC operated in Xe/CO₂ — •Diego Gonzalez-Diaz and Florian Uhlig for the CBM collaboration — GSI, Darmstadt, Germany

Operation of TRD chambers at particle rates up to 200 kHz/cm² is required for identification of daughter electrons from charmonia (J/Ψ and Ψ’), within the future Compressed Baryonic Matter (CBM) experiment at FAIR. With this motivation, we have scrutinized the possibility of adopting as the TRD active element the well established MWPC technology, operated in Xenon for maximizing the absorption of TR X-rays. In order to provide a low aging figure, CO₂ was used as UV-quencher, while the chamber gap was kept at 3 mm to shorten the ions drift time.

A systematic study of thin MWPC with various concentrations of CO₂ in Xe, Ar and Ne under different pitch configurations (2-4 mm) will be presented. The data is described in the framework of the Mathieson theory, that allows to extract the ion mobilities under different hypothesis for the drifting ion, shedding light on the ultimate possibilities of usage of MWPC in high rate environments.