BEAM COMMISSIONING OF SPALLATION NEUTRON AND MUON SOURCE IN J-PARC

In J-PARC, the Materials and Life Science Experimental Facility (MLF) is aimed at promoting experiments using the world highest intensity pulsed neutron and muon beams which are produced at a thick mercury target and a thin carbon graphite target by 3-GeV proton beams, respectively. The first beam was delivered to the target without significant beam loss in May 2008. Stable operation with beam power of larger than 300 kW succeeded for 1 hour. In order to confirm stable operation of the facility, especially for the integrity of the target, it is important to obtain the beam profile at the target. We developed a new technique by using an imaging plate which was attached on the front of the target by the remote handling technique.