Author/Authors :
Maekawa، نويسنده , , Fujio and Harada، نويسنده , , Masahide and Oikawa، نويسنده , , Kenichi and Teshigawara، نويسنده , , Makoto and Kai، نويسنده , , Tetsuya and Meigo، نويسنده , , Shin-ichiro and Ooi، نويسنده , , Motoki and Sakamoto، نويسنده , , Shinichi and Takada، نويسنده , , Hiroshi and Futakawa، نويسنده , , Masatoshi and Kato، نويسنده , , Takashi and Ikeda، نويسنده , , Yujiro and Watanabe، نويسنده , , Noboru and Kamiyama، نويسنده , , Takashi and Torii، نويسنده , , Syuki and Kajimoto، نويسنده , , Ryoichi and Nakamura، نويسنده , , Mitsutaka، نويسنده ,
Abstract :
The J-PARC 1 MW pulsed spallation neutron source JSNS was successfully launched on 30th of May 2008. To demonstrate the unique features of the moderator design and the neutronic performance of JSNS the neutron spectral intensity, absolute neutron flux, and time structure of the neutron pulse shapes etc. have been measured using several neutron instruments since then. The measured energy spectra clearly revealed the feature of the para-hydrogen, as expected when designing the moderator. The measured neutron flux below 0.4 eV agreed with the corresponding design value within ±20%, thus suggesting that the JSNS design calculations to have been reliable. World-class high-resolution diffraction data could be recorded due to the suitability of design of the moderators and the instruments. Another world-class high-intensity neutron flux was also capable of being demonstrated due to the unique design of the large cylindrical coupled moderator.
Keywords :
J-PARC , spallation , JSNS , neutron source , Neutronic performance
