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Harris, D.

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RPAT044 Segmented Foil SEM Grids at Fermilab 2821
 
  • S.E. Kopp, D. Indurthy, Z. Pavlovich, M. Proga, R.M. Zwaska
    The University of Texas at Austin, Austin, Texas
  • B.B. Baller, S.C. Childress, R. Ford, D. Harris, C.L.K. Kendziora, C.D. Moore, G. R. Tassotto
    Fermilab, Batavia, Illinois
  
  Segmented Secondary Emission Monitors (SEM's) will be used to monitor the extracted 120 GeV proton beam for the NuMI facility at Fermilab. The SEM's are constructed from 5 micrometer thick Ti foils. The chambers have 10 cm beam aperture, and the foils are designed to result in 4·10-6 fractional beam loss when inserted in the beam. The foil strips have dynamic tensioning to withstand the heating from the 400kW proton beam. Results from prototype beam tests as well as from commissioning in the NuMI line will be presented.  
RPPT072 Ion Chamber Arrays for the NuMI Beam at Fermilab 3892
 
  • D. Indurthy, R. Keisler, S.E. Kopp, S. Mendoza, Z. Pavlovich, M. Proga, R.M. Zwaska
    The University of Texas at Austin, Austin, Texas
  • M.B. Bishai, M. Diwan, B. Viren
    BNL, Upton, Long Island, New York
  • A.R. Erwin, H.P. Ping, C.V. Velissaris
    UW-Madison/PD, Madison, Wisconsin
  • D. Harris, A. Marchionni, G. Morfin
    Fermilab, Batavia, Illinois
  • J. McDonald, D. Naples, D. Northacker
    University of Pittsburgh, Pittsburgh, Pennsylvania
  
  The NuMI beamline and the MINOS experiment will study at a long baseline the possible oscillation of muon neutrinos and provide a precision measurement of the oscillation parameters. Neutrinos are produced from charged pion decays, where the pions are produced from interaction of the 120 GeV FNAL Main Injector proton beam with a graphite target. Ion chamber arrays have been built to monitor the resulting muons from pion decays, as well as remnant hadrons at the end of the NuMI decay pipe. The arrays of ion chambers measure both the intensity and lateral profile of the muon and hadron beams, allowing studies of sytematics of the neutrino beam. We will describe the design, construction, and precise calibration of the ion chamber arrays. Initial data from commissioning of the beam line and experience from long-term operations will be presented.