Designing the Pion Degrader for the Mu2e Experiment at Fermi National Accelerator Laboratory
Dille, Nathanael J., 1998--
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This paper focuses on the effects of a pion degrader for the Mu2e experiment at Fermilab. The Mu2e experiment will be sending a beam of negatively charged pions and muons into an aluminum (Al) target in order to observe the decay of muons directly into electrons without emitting any neutrinos, which would be an example of Charged Lepton Flavor Violation (CLFV). In order to detect the presence of CLFV decays, the energy of the electrons leaving the target material must be found and measured as accurately as possible. We will calibrate the energy with positive pions that stop in the target, and allowing them to decay into positrons of well-known momentum. Using this known process, we can correctly scale our detectors and describe the amount of energy lost while exiting the target material. In order to stop pions, however, we must first reduce their kinetic energy into an acceptable range before they strike the target. A pion energy degrader will be constructed to accomplish this effect, stripping a portion of the kinetic energy of the pions, as well as reducing the number of muons allowed to strike the target, which add extra background noise to the pion decay measurement. A comprehensive study of the effect of an aluminum degrader on the energy of pions and muons using Monte Carlo simulations will be provided in this report.