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Kai, Tetsuya; Teshigawara, Makoto; Watanabe, Noboru; Harada, Masahide; Sakata, Hideaki*; Ikeda, Yujiro
JAERI-Conf 2001-002, p.786 - 792, 2001/03
no abstracts in English
Kai, Tetsuya; Harada, Masahide; Watanabe, Noboru; Teshigawara, Makoto; Sakata, Hideaki*; Ikeda, Yujiro
JAERI-Conf 2001-002, p.868 - 872, 2001/03
no abstracts in English
Harada, Masahide; Oikawa, Kenichi; Kai, Tetsuya; Meigo, Shinichiro; Takada, Hiroshi
no journal, ,
To confirm neutronic performance of JSNS, we have performed to measure a neutron intensity and a neutron pulse. However, there were a bit discrepancy (
20%) between neutron intensities measured by a He-3 neutron detector system and an Au foil activation method. To reduce the discrepancy, we have done the re-measurement with three improvements. (1) The detection efficiency of the He-3 neutron detector was precisely determined by long wave neutrons. (2) Dead time was corrected using a random pulser. (3) The same collimation setting was adopted. As a result of the measurement at a neutron instrument "NOBORU" (BL10) of JSNS, we obtained good agreement (below 10%) between data measured by the He-3 neutron detector system and the Au foil activation method. Especially, the same collimation setting was important to reduce the discrepancy due to a spatial distribution of the neutron beam. In addition, neutron intensities with changing a proton beam intensity, profile and position were measured by the He-3 neutron detector system. And we also analyzed by the calculation with PHITS. As a result, it was found that neutron intensity depends on the proton beam condition. We also found good agreement between the measurement and the PHITS calculation.
