GPS survey in long baseline neutrino-oscillation measurement

H. Noumi, M. Ieiri, T. Inagaki, T. Hasegawa, Y. Katoh, M. Kohama, M. Kurodai, E. Kusano, T. Maruyama, M. Minakawa, K. Nakamura, K. Nishikawa, M. Sakuda, Y. Suzuki, M. Takasaki, K. H. Tanaka, Y. Yamanoi

Research output: Contribution to journalReview article

1 Citation (Scopus)

Abstract

We made a series of surveys to obtain neutrino beam line direction toward SuperKamiokande (SK) at a distance of 250 km for the long-baseline neutrino oscillation experiment at KEK. We found that the beam line is directed to SK within 0.03 mr and 0.09 mr (in sigma) in the horizontal and vertical directions, respectively. During beam operation, we monitored the muon distribution from secondary pions produced at the target and collected by a magnetic horn system. We found that the horn system functions like a lens of a point-to-parallel optics with magnification of approximately - 100 and the focal length of 2.3 m. Namely, a small displacement of the. primary beam position at the target is magnified about a factor - 100 at the muon centroid, while the centroid position is almost stable against a change of the incident angle of the primary beam. Therefore, the muon centroid can be a useful monitor of the neutrino beam direction. We could determine the muon centroid within 6 mm and 12 mm hi horizontal and vertical directions, respectively. This means that the neutrino beam direction could be controlled within 0.03 mr and 0.06 mr (in sigma) in the horizontal and vertical directions, respectively. We confirmed the beam direction with the neutrino distribution reconstructed at the near detector in KEK.

Original languageEnglish
Pages (from-to)2245-2249
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume51
Issue number5 I
DOIs
Publication statusPublished - Oct 1 2004

Keywords

  • Beams
  • Global Positioning System
  • Neutrinos

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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  • Cite this

    Noumi, H., Ieiri, M., Inagaki, T., Hasegawa, T., Katoh, Y., Kohama, M., Kurodai, M., Kusano, E., Maruyama, T., Minakawa, M., Nakamura, K., Nishikawa, K., Sakuda, M., Suzuki, Y., Takasaki, M., Tanaka, K. H., & Yamanoi, Y. (2004). GPS survey in long baseline neutrino-oscillation measurement. IEEE Transactions on Nuclear Science, 51(5 I), 2245-2249. https://doi.org/10.1109/TNS.2004.836042