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g-2 – E989


The g-2 experiment, under construction at the Fermilab laboratory (Chicago-IL, USA), has the objective of measuring the magnetic anomaly of the muon with a precision of 1.6×10–10 (0.14 parts per million), such as to allow a very stringent test of the Standard Model. It will require a data sample 20 times more extensive than the previous experiment at Brookhaven National Laboratory and reduction by a factor of 3 of the uncertainty of the systematic effects. The technique used involves the measurement of the anomalous precession frequency of the muon in a storage ring with a magnetic field of 1.4 T to an accuracy of 0.1 parts per million. To achieve such accuracy the system for reading the calorimetric signal (photo sensor) and associated electronics must be extremely stable, and control of the gain stability with laser calibration system must be better than 0.1%.

Latest modified: 24 May 2016