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Renewal of the KENS target–moderator–reflector assembly and its performance

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Abstract.

The spallation neutron source of KEK(KENS) was renewed by replacing the whole target–moderator–reflector assembly (TMRA) with a new tantalum-clad tungsten target. Gadolinium poison, giving a sharper pulse, was installed in the ambient moderator. The new target was developed to increase the source intensity by about 20% compared to the former tantalum target. The neutron performance was measured with several spectrometers. The cold-neutron intensity, which in the former TMRA had decreased to about 30% of its initial state, was recovered. The epithermal-neutron fluxes were increased as the neutronic design calculations indicated. The scattered-neutron profile showed low background and became more symmetrical with the shorter tail. With the total-scattering spectrometer, the radial distribution function shows better resolution in position. As a whole, the new KENS is quite able to investigate the materials of interest.

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Authors and Affiliations

  1. High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki-ken 305-0801, Japan, , , , , , JP

    M. Kawai, T. Ino, N. Torikai, S. Itoh, T. Kamiyama & M. Furusaka

  2. Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Sapporo 060-8628, Japan, , , , , , JP

    Y. Kiyanagi & M. Ooi

  3. Research Reactor Institute, Kyoto University, Noda, Kumatori-cho, Osaka 590-0494, Japan, , , , , , JP

    T. Fukunaga

Authors
  1. M. Kawai
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  2. T. Ino
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  3. N. Torikai
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  4. S. Itoh
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  5. T. Kamiyama
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  6. M. Furusaka
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  7. Y. Kiyanagi
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  8. M. Ooi
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  9. T. Fukunaga
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Additional information

Received: 27 July 2001 / Accepted: 24 October 2001

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ID="*"Corresponding author. (Fax: +81-298/64-3203, E-mail: masayoshi.kawai@kek.jp)

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Kawai, M., Ino, T., Torikai, N. et al. Renewal of the KENS target–moderator–reflector assembly and its performance . Appl Phys A 74 (Suppl 1), s43–s45 (2002). https://doi.org/10.1007/s003390101085

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  • DOI: https://doi.org/10.1007/s003390101085

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