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T: Fachverband Teilchenphysik

T 50: Spurkammern und Myondetektoren I

T 50.7: Vortrag

Montag, 3. März 2008, 18:15–18:30, Peterhof-HS 4

Development of Precision Drift Tube — Joerg Dubbert¹, Sandra Horvat¹, Oliver Kortner¹, Hubert Kroha¹, •Federica Legger¹, Felix Rauscher², and Robert Richter¹ — ¹Max-Planck-Institut für Physik, D-80805 — ²Ludwig-Maximilians-Universität,

Detectors at the Large Hadron Collider (LHC) at CERN are designed to withstand unprecedentedly high background rates. At the LHC design luminosity of 10³⁴ cm²s⁻¹, the Muon Drift Tube chambers of the ATLAS muon spectrometer have to cope with neutron and gamma ray background rates of up to 500 Hz/cm² in the inner and middle chamber layers in the forward regions of the detector. At the Super-LHC, the high luminosity upgrade of the LHC, the background rates are expected to increase by an order of magnitude. The resulting high occupancies lead to a significant deterioration of the muon detection efficiency compromising the physics goals. The ATLAS muon spectrometer is instrumented with three layers of precision tracking detectors each consisting of 6 or 8 layers of pressurized aluminum drift tubes of 30 mm diameter. The possibility to improve the muon detection efficiency at the Super-LHC by reducing the diameter of the drift tubes has been investigated. We report about the design and test results of prototype drift-tube detectors with thin-walled aluminum tubes of 15 mm diameter.