2002 LHC days in Split Sandra Horvat 08 12 October, Ruer Bokovi Institute, Zagreb Max-Planck-Institute for Physics, Munich Potential is here... (particle detector) Physics ! Physics ! MDT Precision Chambers in ATLAS Muon Spectrometer A Toroidal LHC ApparatuS S.Horvat 1/15 LHC days in Split, October 10 th 2002.Introduction Muon Spectrometer Physics & Instrumentation Monitored Drift Tube (MDT) Chambers Chamber Assembly and Mechanical Accuracy Chamber Performance Summary 23m 46m pp collisions at 14 TeV (centre of mass) search for the Higgs(es) LHC: S.Horvat 2/15 LHC days in Split, October 10 th 2002.Physics Some selected physics channels: Instrumentation: Trigger Chambers (RPC, TGC) low and high p t functionality Precision Chambers (MDT, CSC) high momentum resolution Alignment monitoring the chamber displacements and deformations S.Horvat 3/15 LHC days in Split, October 10 th ATLAS Muon Spectrometer Goal: measurement of the muon track curvature in a magnetic field of B=0.3-2 T (air core toroid) 3 layers, projective tower geometry full coverage up to | |4l) designed to provide a high resolution stand-alone momentum measurement puts demanding requirements on the accuracy of the precision chambers, resulting in a series of novel techniques for the chamber assembly, as well as in the optical alignment monitoring single tube resolution defines the chamber performance 80 m an average resolution of 80 m has been demonstrated (at nominal operating conditions) expected dependence on the changes in threshold and HV observed The achieved mechanical wire positioning accuracy and tube resolution 40 m provide the desired muon track curvature resolution of 40 m. The achieved mechanical wire positioning accuracy and tube resolution 40 m provide the desired muon track curvature resolution of 40 m. + = S.Horvat 16/15 LHC days in Split, October 10 th 2002.Outlook... H -> ZZ -> 4 A T - L A S T !?...testing the combined performance and alignment of more chambers, together with trigger chambers, in a magnetic field, with background signals... Put everything together (~2000 chambers)