Performance of the Muon $g-2$ calorimeter and readout systems measured with test beam data

Understand

A single calorimeter station for the Muon $g-2$ experiment at Fermilab includes the following subsystems: a 54-element array of PbF$_{2}$ Cherenkov crystals read out by large-area SiPMs, bias and slow-control electronics, a suite of 800 MSPS waveform digitizers, a clock and control distribution network, a gain calibration and monitoring system, and a GPU-based frontend read out through a MIDAS data acquisition environment.

• The entire system performance was evaluated using 2.5 - 5 GeV electrons at the End Station Test Beam at SLAC.
• This paper includes a description of the individual subsystems and the results of measurements of the energy response and resolution, energy-scale stability, timing resolution, and spatial uniformity.
• All measured performances meet or exceed the $g-2$ experimental requirements.