ATLAS RPC perfomance on a dedicated cosmic ray test-stand (original) (raw)

RPC cosmic ray tests in the ATLAS experiment

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007

Extensive tests with cosmic rays were performed with Resistive Plate Chamber (RPC) trigger chambers belonging to 6 muon stations of sector 13 installed in the ATLAS muon spectrometer. We illustrate the results of this pre-commissioning phase, which represents a test bench for the final commissioning of the ATLAS RPC system with cosmic rays. r

The LECCE cosmic ray testing facility for the ATLAS RPC

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006

A detailed description of a dedicated facility built in the Lecce INFN and Physics Department High Energy Laboratory to test part of the Resistive Plate Counters (RPC) of the ATLAS barrel muon spectrometer is presented. In this cosmic ray test stand the chambers are operated for the first time, after being assembled and equipped with all required services for gas and electrical connections. A complete set of measurements is performed on each chamber in order to certificate its quality and performances before the installation in the experiment.

Test and performances of the RPC trigger chambers of the ATLAS experiment at LHC

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004

RPCs will be used as trigger detectors in the barrel region of the Muon Spectrometer of the ATLAS experiment at LHC. The total number of RPC units to be installed is 1088, covering a total surface of about 3500 m 2. ATLAS RPCs work in avalanche mode with C 2 H 2 F 4 /C 4 H 10 /SF 6 (94.7%/5%/0.3%) gas mixture. A cosmic ray test stand has been designed and built in Naples laboratories in order to carry out a complete test of the ATLAS RPC units. Since August 2002 about 300 units have been tested. A description of the test stand, test procedure and results are presented.

Commissioning of the ATLAS Muon Spectrometer with cosmic rays

2010

Abstract The ATLAS detector at the Large Hadron Collider has collected several hundred million cosmic ray events during 2008 and 2009. These data were used to commission the Muon Spectrometer and to study the performance of the trigger and tracking chambers, their alignment, the detector control system, the data acquisition and the analysis programs. We present the performance in the relevant parameters that determine the quality of the muon measurement.

The ATLAS LVL1 Barrel Muon Trigger Commissioning with Cosmic Rays

2006 IEEE Nuclear Science Symposium Conference Record, 2006

The ATLAS Muon Spectrometer, currently in the installation phase, uses dedicated detectors to be able to trigger on high transverse momentum muons in the range 6 − 20 GeV/cṘesistive Plate Chambers (RPC) are equipping the Barrel region in the middle and outer station, while precision chambers (Monitored Drift Tubes, MDT) are present also in the inner layer. The RPCs have the required timing and spatial resolution of about 2 ns × 1 cm, to be able to associate the muon to the correct bunch crossing and provide the second coordinate measurements to the MDTs. In order to successfully commission the chambers, cosmic runs are taken to check and validate the readout and trigger chain, and cosmic rates are measured and compared against values obtained with a cosmic ray Montecarlo generator and full detector simulation. The first part of the detector under commission is the set of horizontal chambers positioned between the feet of the detector. The first results obtained in the ATLAS cavern will be presented. The first cosmic data taking collects signals from chambers arranged in six trigger towers, covering about one quarter of the full detector lenght. The experience gained on this small part of the detector will be very useful to define the commissioning work for the whole detector.

Studies of the performance of the ATLAS detector using cosmic-ray muons

The European Physical Journal C-Particles and Fields, 2011

Muons from cosmic-ray interactions in the atmosphere provide a high-statistics source of particles that can be used to study the performance and calibration of the ATLAS detector. Cosmic-ray muons can penetrate to the cavern and deposit energy in all detector subsystems. Such events have played an important role in the commissioning of the detector since the start of the installation phase in 2005 and were particularly important for understanding the detector performance in the time prior to the arrival of the first LHC ...