Author: Prebys, E.
Paper Title Page
MOPPD084 Optimization of Extinction Efficiency in the 8-GeV Mu2e Beam Line 565
  • I.L. Rakhno, A.I. Drozhdin, C. Johnstone, N.V. Mokhov, E. Prebys
    Fermilab, Batavia, USA
  Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
A muon-to-electron conversion experiment at Fermilab is being designed to probe for new physics beyond the standard model at mass scales up to 10000 TeV*. The advance in experimental sensitivity is four orders of magnitude when compared to existing data on charged lepton flavor violation. The critical requirement of the experiment is the ability to deliver a proton beam contained in short 100-ns bunches onto a muon production target, with an inter-bunch separation of about 1700 ns. In order to insure the low level of background at the muon detector consistent with the required sensitivity, protons that reach the target between bunches must be suppressed by an enormous factor, 109. This paper describes the results of numerical modeling with STRUCT and MARS codes for a beam line with a collimation system**,*** and optics that achieves an experimental extinction factor of one per billion.
* R.M. Carey et al., Mu2e Proposal, Fermilab (2008).
** W. Molzon, “Proton Beam Extinction,” MECO-EXT-05-002 (2005).
*** E. Prebys, Mu2e-doc-534 (2009),
TUPPC040 Model Calibration and Optics Correction Using Orbit Response Matrix in the Fermilab Booster 1251
  • M.J. McAteer, S.E. Kopp
    The University of Texas at Austin, Austin, Texas, USA
  • V.A. Lebedev, E. Prebys
    Fermilab, Batavia, USA
  • A.V. Petrenko
    BINP SB RAS, Novosibirsk, Russia
  A beam-based method of optical model calibration using the measured orbit response matrix, known as the LOCO method, was successfully applied to Fermilab's rapid-cycling Booster synchrotron. Orbit responses were measured by individually changing the strength of each dipole corrector throughout the acceleration cycle, and dispersion was measured by changing the beam's radial offset. The model calibration procedure revealed large calibration errors for all elements in the Booster's recently-installed multipole corrector packages and beam position monitors. The resulting model was used to correct coupling and beta beating.  
WEPPD081 Optimization of AC Dipole Parameters for the Mu2e Extinction System 2714
  • E. Prebys
    Fermilab, Batavia, USA
  The Mu2e experiment is being planned at Fermilab to measure the rate for muons to convert to electrons in the field of an atomic nucleus with unprecedented precision. This experiment uses an 8 GeV primary proton beam consisting of short (~200 nsec FW) bunches, separated by 1.7 μs. It is vital that out-of-bunch beam be suppressed at the level of 10-10 or less. This poster describes the parametric analysis which was done to determine the optimum harmonics and magnet specifications for this system, as well as the implications for the beam line optics.  
WEPPR028 An Estimate of Out of Time Beam Upon Extraction for Mu2e 2994
  • N.J. Evans, S.E. Kopp
    The University of Texas at Austin, Austin, Texas, USA
  • E. Prebys
    Fermilab, Batavia, USA
  Funding: U.S. Dept. of Energy.
A bunched beam with specific structure is crucial to attaining the experimental sensitivity desired by the Mu2e collaboration. The final goal is a ratio of in-time to out-of-time beam, known as beam extinction, of 10-10. An AC dipole system is in development to attain the final goal by sweeping out-of-time beam onto a collimation system, but it is still necessary to achieve something on the order of 10-5 when beam is extracted from the Fermilab Debuncher ring to the experiment hall. Several sources of out-of-time beam in the Debuncher ring are analyzed, including: intrabeam scattering, RF noise, beam-gas interaction and scattering off of the extraction septum. Estimates are given for each source as well as a final estimate of total out-of-time beam expected upon extraction.