3 research outputs found
Development of a detector (ALFA) to measure the absolute LHC luminosity at ATLAS
The ATLAS collaboration plans to determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. Detector modules will be placed above and below the LHC beam axis in roman pot units at a distance of 240 m on each side of the ATLAS interaction point. They allow the detectors to approach the beam axis to millimeter distance. Overlap detectors also based on the scintillating fibre technology, will measure the precise relative position of the two detector modules. Results obtained during beam tests at DESY and at CERN validate the detectors design and demonstrate the achievable resolution. We also report about radiation hardness studies of the scintillating fibres to estimate the lifetime of the ALFA system at different operating conditions of the LHC
Luminosity measurement at ATLAS - development, construction and test of scintillating fibre prototype detectors
We are reporting about a scintillating fibre tracker which is proposed for
the precise determination of the absolute luminosity of the CERN LHC at
interaction point 1 where the ATLAS experiment is located. The detector needs
to track protons elastically scattered under micro-rad angles in direct
vicinity to the LHC beam. It is based on square shaped scintillating plastic
fibres read out by multi-anode photomultiplier tubes and is housed in Roman
Pots. We describe the design and construction of prototype detectors and the
results of a beam test experiment at DESY. The excellent detector performance
established in this test validates the detector design and supports the
feasibility of the proposed challenging method of luminosity measurement
Development of a detector (ALFA) to measure the absolute LHC luminosity at ATLAS
The ATLAS collaboration plans to determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (μrad). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. Detector modules will be placed above and below the LHC beam axis in roman pot units at a distance of 240 m on cach side of the ATLAS interaction point. They allow the detectors to approach the beam axis to millimeter distance. Overlap detectors also based on the scintillating fibre technology, will measure the precise relative position of the two detector modules, Results obtained during beam tests at DESY and at CERN validate the detectors design and demonstrate the achievable resolution. We also report about radiation hardness studies of the scintillating fibres to estimate the lifetime of the ALFA system at different operating conditions of the LHC