Naslov
Performance of the ATLAS precision muon chambers under LHC operating conditions

Autori
Deile, M. ; Dietl, H. ; Dubbert, J. ; Horvat, Sandra ; Kortner, O. ; Kroha, H. ; Manz, A. ; Mohrdieck, S. ; Rauscher, F. ; Richter, R. ; Staude, A.

Izvornik
Nuclear Instruments and Methods in Physics Research: Section A (0168-9002) 518 (2004); 65-68

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
drift chambers; drift tubes; ATLAS detector; muon spectrometer

Sažetak
For the muon spectrometer ofthe ATLAS detector at the Large Hadron Collider (LHC), large drift chambers consisting of 6– 8 layers ofpressurized drift tubes are used for precision tracking covering an active area of 5000 m2 in the toroidal .eld ofsuperconducting air-core magnets. The chambers have to provide a spatial resolution of41 mm with Ar:CO2 (93:7) gas mixture at an absolute pressure of 3 bar and gas gain of 2 _ 104: The environment in which the chambers will be operated is characterized by high neutron and g background with counting rates ofup to 100 s_1 cm_2: The resolution and ef.ciency of a chamber from the serial production for ATLAS has been investigated in a 100 GeV muon beam at photon irradiation rates as expected during LHC operation. A silicon strip detector telescope was used as external reference in the beam. The spatial resolution of a chamber is degraded by 4 mm at thehighest background rate. The detection ef.ciency of the drift tubes is unchanged under irradiation. A tracking ef.ciency of 98% at the highest rates has been demonstrated.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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