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LBNE Long-Baseline Neutrino Experiment Document 6265-v1

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Optimizing the Geometry of the Focusing Horn Magnets in the Long-Baseline Neutrino Experiment Beamline

Document #:
Document type:
technical note
Submitted by:
Mary Bishai
Updated by:
Mary Bishai
Document Created:
08 Aug 2012, 09:52
Contents Revised:
08 Aug 2012, 09:52
Metadata Revised:
08 Aug 2012, 09:52
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e report the results of our simulations for electron neutrino appearance at the far detector in the proposed LBNE(Long Baseline Neutrino Experiment) experiment as a function of the geometry of the focusing horn magnets and cylindrical graphite target located one kilometer before the near detector. The current setup of the beamline is a target distance of 45cm, with horn current of .20 MA in both horns, and horn spacing of 6m. We used the horn shape of the existing NuMI(Neutrinos at the Main Injector) horns at Fermilab. The 0-15 GeV neutrino energy range optimal horn/target geometry and currents for maximum electron neutrino flux are: the target located 50cm before horn 1 in the beamline, spacing between the horns at 10m, and .30 MA current for both horns using the NuMI horns. For the more important neutrino energy range of 0-2 GeV where oscillations are more readily observable, however, the optimal horn/target geometry and currents are: the target located 0cm target before horn 1 in the beamline, horn spacing between horns at 6m, and .22 MA horn current for both NuMI horns. These optimizations provide a significant yield, increasing the current capabilities of the NuMI beamline by 32.0$\%$ for 0-15 GeV and and 23.8$\%$ for the 0-2 GeV neutrino energy case. Additionally, there is an intersection of the two optimal regions at: the target 30-40cm before horn 1 with a horn current of .28-.30 MA, which gives an increase in yield of 18.9$\%$ over 0-15 GeV and 14.9$\%$ over 0-2 GeV. In the horn current optimization, the best currents are: .4 MA horn 1 and .5 MA horn 2 for 0-15 GeV and .25 MA in both horns for 0-2 GeV. The 0-15 GeV horn current optimization give a 53.8$\%$ increase, while the 0-2 GeV optimization gives a 13.2$\%$ increase in electron neutrino yield when compared to .20 MA in both horns.
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beamline horns focusing
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