Fermilab Muon g-2 3B dataset from Run-3a

This dataset is a summary file of the 3B dataset from the Run-3a data-taking period in November/December 2019, recorded by the Fermilab Muon g-2 Collaboration. The experiment records the time and energy of positrons from the decay of positive muons. These positive muons are confined by magnetic and electric fields to circulate in a cyclotron until they decay, and on average, it takes 149.2 ns for the muons to complete one revolution of the cyclotron. The 3B dataset recorded 1.69 billion positrons over a period of 15 days. Rather than have 1.69 billion records, the data is instead histogrammed. The number of positrons in each 149.2 ns interval is recorded in this dataset. The data has two columns: the first is the time (in ns), relative to when muons were injected into the cyclotron, of the start of the interval, and the second is the number of positrons (above a certain energy) recorded in that 149.2ns time interval. There are 4188 intervals recorded every time muons are injected into the cyclotron. The first interval occurs approximately 25 microseconds after the muons are injected, and the last interval occurs 650 microseconds after the muons are injected. The dataset thus records the number of positrons observed over a duration of approximately 625 microseconds. Approximately 80000 muons are injected into the cyclotron every 1.4 seconds, and the number of positrons is recorded in these intervals each time. The number is summed over all these injections for each interval, and this is what is recorded in the dataset.