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Beam dynamics corrections to the Run-1 measurement of the muon anomalous magnetic moment at FermilabAnastasi, A.; Badgley, K.; Bailey, I.; Berz, M.; Bhattacharya, M.; Bono, J.; Cantatore, G.; Casey, B. C. K.; Cauz, D.; Chakraborty, R.; Chapelain, A.; Charity, S.; Chislett, R.; Chupp, T. E.; Cotrozzi, L.; Dabagov, S.; Di Falco, S.; Di Meo, P.; Driutti, A.; Eads, M.; Esquivel, J.; Farooq, M.; Fatemi, R.; Fiedler, A.; Flay, D.; Frlež, E.; Froemming, N. S.; Fry, J.; Gabbanini, C.; Galati, M. D.; Ganguly, S.; George, J.; Gibbons, L. K.; Gioiosa, A.; Grange, J.; Grant, S.; Haciomeroglu, S.; Halewood-Leagas, T.; Hampai, D.; Hempstead, J.; Hertzog, D. W.; Hibbert, A.; Hodge, Z.; Holzbauer, J. L.; Hong, K. W.; Iacovacci, M.; Kargiantoulakis, M.; Karuza, M.; Kaspar, J.; Khechadoorian, Z.; Khomutov, N. V.; Kiburg, M.; Kim, O.; King, B.; Kinnaird, N.; Labe, K. R.; LaBounty, J.; Lancaster, M.; Li, L.; Logashenko, I.; Lorente Campos, A.; Lusiani, A.; Lyon, A. L.; MacCoy, B.; Madrak, R.; Makino, K.; Marignetti, F.; Mastroianni, S.; Miozzi, S.; Morse, W. M.; Mott, J.; Nath, A.; Newton, D.; Nguyen, H.; Pauletta, G.; Piacentino, G. M.; Plaster, B.; Počanić, D.; Quinn, B.; Ritchie, J. L.; Roberts, B. L.; Rubin, D. L.; Smith, M. W.; Sorbara, M.; Stöckinger, D.; Stratakis, D.; Stuttard, T.; Sweigart, D. A.; Syphers, M. J.; Tarazona, D. A.; Thomson, K.; Tishchenko, V.; Tran, N. H.; Turner, W.; Valetov, E.; Vasilkova, D.; Venanzoni, G.; Weisskopf, A.; Winter, P.; Wu, W.
Physical review. Accelerators and beams, 04/2021, Letnik: 24, Številka: 4Journal Article
This paper presents the beam dynamics systematic corrections and their uncertainties for the Run-1 dataset of the Fermilab Muong−2Experiment. Two corrections to the measured muon precession frequencyωamare associated with well-known effects owing to the use of electrostatic quadrupole (ESQ) vertical focusing in the storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through the radial electric field components created by the ESQ system. The correction depends on the stored momentum distribution and the tunes of the ring, which has relatively weak vertical focusing. Vertical betatron motions imply that the muons do not orbit the ring in a plane exactly orthogonal to the vertical magnetic field direction. A correction is necessary to account for an average pitch angle associated with their trajectories. A third small correction is necessary, because muons that escape the ring during the storage time are slightly biased in initial spin phase compared to the parent distribution. Finally, because two high-voltage resistors in the ESQ network had longer than designedRCtime constants, the vertical and horizontal centroids and envelopes of the stored muon beam drifted slightly, but coherently, during each storage ring fill. This led to the discovery of an important phase-acceptance relationship that requires a correction. The sum of the corrections toωamis0.50±0.09ppm; the uncertainty is small compared to the 0.43 ppm statistical precision ofωam.
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