Speaker
Description
The LUCID-2 detector is the main luminometer of the ATLAS experiment and the only one able to provide a reliable luminosity determination in all beam configurations, luminosity ranges and at bunch-crossing level. The detector works through the production and detection of Cherenkov light in unusual ways: within the fused silica (quartz) window of the photomultipliers (PMTs) and in the core of dedicated fused-silica optical fibers. Since the PMTs and the fibers are positioned in the forward region, LUCID puts to the test these detectors in some of the most extreme environments in particle physics. To keep the detectors stable in these condition, an innovative gain monitoring system based on Bi207 source deposition of the PMT window was developed. The environment will get even more challenging with the upgrade to the High Luminosity LHC (HL-LHC), where the average number of interactions per bunch crossing will go from 60 to 140 and then 200. Prototypes of the photomultiplier and the fiber detectors are currently installed in ATLAS in order to understand their performance and the characteristics of their signals in a real environment. The analysis of these detectors will be presented, together with the laboratory, irradiation and test-beam results obtained during the characterization of the prototypes. These will also be compared with alternative PMTs and fiber lab and irradiation results.
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