Beam Extinction Monitor Design Optimization and Performance Studies for the Mu2e Experiment
Author | : Elizabeth Klara Marie Heckmaier |
Publisher | : |
Total Pages | : 119 |
Release | : 2013 |
Genre | : |
ISBN | : 9781303643330 |
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The proposed Mu2e experiment at the future muon campus at the Fermi National Accelerator Laboratory is designed to probe for new physics (in particular, muon to electron conversion) at the intensity frontier. Mu2e is designed to observe and measure charged lepton flavor violation (CLFV) via muon capture (u ̄ + N(Z) [arrow right] e ̄+ N(Z)) at an event sensitivity of approximately 5.4 x 10−17 on a 90% confidence interval. Achieving this level of sensitivity necessitates a beam extinction monitor to detect secondary particles indicative of out of time (OoT) beam protons. If the beam extinction exceeds the design value of 10−10, prompt background levels will not be adequately suppressed to achieve the desired event sensitivity. A series of Monte Carlo simulations were performed to study the extinction monitor's ability to record OoT events as well as its sensitivity to misalignment during the construction of the experiment. Additionally, various extinction monitor geometry changes were implemented within Geant4 to measure and minimize the effects of damaging radiation on crucial detector elements. Independent analysis of these simulations indicate the nominal extinction monitor design meets the Mu2e experiment's requirements. Minimal design changes substantially mitigate the effects of harmful radiation damage and provide for a more robust detector-maximizing the extinction monitor's lifetime with hardware replacement on the order of approximately once a year, while minimizing operational cost and experiment downtime.