Anna Driutti et al, “The Calibration System for the Muon (g-2) calorimeters”
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Anna Driutti et al, "The Calibration System for the Muon (g-2) calorimeters"
The Muon g–2 experiment at Fermilab (E989) plans to measure the muon anomalous magnetic moment to a precision of 140 parts
per billion (ppb), which corresponds to a total uncertainty of 1.6 × 10−10. To achieve this level of precision the experiment must
detect more than 1.8 × 1011 positrons from the muon decay by using the 24 calorimeters distributed around the muon storage ring.
Each calorimeter consisting of 54 PbF2 crystals read out by SiPMs. The response of each of the 1296 channels must be calibrated
and monitored to keep uncertainties due to gain fluctuations at the sub-per mil level in the time interval corresponding to one beam
fill (700 μs) and at the sub-percent level on longer timescales. These requirements are much more demanding than those needed
by most high energy physics experiments. This paper presents a novel laser-based calibration system that distributes light to all
calorimeter cells, while allowing one to correct for laser intensity fluctuations and to monitor the distribution chain stability at
unprecedented levels of accuracy. Results on the system performance during the first few months of stored muon operation in 2018
are also presented.
Proceedings on the the PM2018 - 14th Pisa Meeting on Advanced Detectors"',
27 May 2018 - 02 June 2018, La Biodola, Isola D'Elba (Italy)"