Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session U06: Precision Measurements in Accelerators
1:30 PM–3:18 PM,
Tuesday, April 18, 2023
Room: MG Salon F - 3rd Floor
Sponsoring Units: GPMFC DPB
Chair: Mei Bai, SLAC - Natl Accelerator Lab
Abstract: U06.00004 : Beam Dynamics Corrections to the Spin Precession Frequency Measurement in the Muon g-2 Experiment*
2:51 PM–3:18 PM
Tyler J Barrett
Tyler J Barrett
The experimental method involves positive muon injection into a superconducting magnetic storage ring. While stored, the muon spins precess relative to the beam momentum at a rate which depends on the anomalous magnetic moment. Through parity violation in muon decays, this anomalous spin precession frequency is observable in the energy spectrum of the muons' daughter positrons as a function of time. Combined with a precision measurement of the storage ring's magnetic field, the anomalous spin precession frequency yields the anomalous magnetic moment.
However, there are complications which arise due to beam dynamics within the storage ring, necessitating important corrections. Two effects, known as the electric field and pitch corrections, account for fundamental beam dynamics contributions to the relationship between the spin precession frequency and the magnetic moment. Other corrections arise from biases in the measured spin precession frequency caused by systematic changes in the stored muon ensemble's characteristics over time. This talk will describe the evaluation of these beam dynamics corrections and their uncertainties, with a focus on the electric field and pitch corrections.
*This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-2139899.
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