Author: Hooper, R.J.
Paper Title Page
WEPGW106 Statistical Measurement of Longitudinal Beam Halo in Fermilab Recycler 2742
  • E. Prebys, T.M. Nguyen
    UCD, Davis, California, USA
  • A.S. Dyshkant, D. Hedin
    Northern Illinois University, DeKalb, Illinois, USA
  • A. Gaponenko
    Fermilab, Batavia, Illinois, USA
  • R.J. Hooper
    Lewis University, Romeoville, Illinois, USA
  • M. Jones
    Purdue University, West Lafayette, Indiana, USA
  Funding: This work supported by US Department of Energy Contract DE-AC02-07CH11359
The formation of non-Gaussian halo in both the transverse and longitudinal dimensions of beam bunches has been notoriously difficult both the model and to measure. We present a technique to measure the longitudinal halo of 2.5 MHz bunches in the Fermilab Recycler, which have been formed for the g-2 anomalous magnetic moment experiment. While out of time beam is not a particular concern to this experiment, it is a key issue for the subsequent Mu2e rare muon decay experiment, which will use the same bunch formation procedure. Our measurement relies on a statistical technique, in which a small fraction of the beam is scattered from the primary collimation foil in the recycler, and then is detected by a charge telescope consisting of quartz Cherenkov radiators and photomultiplier tubes. By integrating over many revolutions, the time profile of longitudinal halo (out-of-time beam) can be measured down to less than a 10-5 fractional level, relative to in-time beam. These results can then be compared to simulations.
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About • paper received ※ 15 May 2019       paper accepted ※ 22 May 2019       issue date ※ 21 June 2019  
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