Abstract
Japan proton accelerator research complex (J-PARC) with the power of 1 MW have been constructing since 2001 in JAERI, Japan. And the first beam will come by 2007. As one important day-one neutron instruments at Material and Life Science Facility in J-PARC, a single crystal diffractometer No.1 for structural analysis of biological macromolecules and organic compounds with unit cell dimensions less than about 135 Å (BIX-P1) has been proposed, considering the international competition in biological science and the expansion of the application to the industrial fields. It is expected to gain efficiency more than 50 times larger than neutron biological diffractometers BIX-3 and BIX-4 installed at JRR-3 reactor also in JAERI. In this paper, evaluation of moderator, items of necessary R & D and the current specification of BIX-P1 are shown.
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