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Abstract
The most important object of the Materials and Life science experimental Facility (MLF) is to provide high intense and quality neutrons to users. For this purpose, the 1-MW pulsed spallation neutron source, the Japan Spallation Neutron Source (JSNS), at MLF has several unique features, i.e. a cross-flow type mercury target to accept MW-class high power proton beam, three-type moderators for sharp and/or high intense neutron pulses, and cryogenic hydrogen circulation system with an ortho/para hydrogen converter. The main specification is shown in Table 1.