Georg Viehhauser

Abstract:

Large-area, high-precision drift chambers, based on the "jet cell" concept, have been developed for the muon spectrometer of the ATLAS experiment at LHC. Emphasis is placed on the control and reduction of systematic error in the drift measurement and in the mechanical construction. Results of measurements on prototypes are given. These indicate that a global precision of σ ≲ 70 μm is achievable for large-area chambers.

Abstract:

Recent results from test measurements with cosmic rays of jet-cell chamber prototypes, developed and studied for the mu, detector of the ATLAS apparatus, are reported.

Abstract:

A prototype electromagnetic calorimeter containing 180 litres of liquid krypton has been tested in electron and muon beams at the CERN SPS. The main features of this detector are its active shower medium, a granularity of 2 cm with tower readout, and the use of the initial current readout technique with an effective shaping time of about 60 ns. An energy resolution for electrons of 4.1% √E[GeV] with a constant term of 0.4% and a noise contribution of 50 MeV has been achieved. The calorimeter has a spatial resolution of 4.5 mm √E[GeV] with a constant term of 0.3 mm and a time resolution of about 0.5 ns for energies larger than 10 GeV. © 1994.