Mineo Kato

J-PARC decay muon channel construction status

The new Muon Science Facility (MUSE) that is now under construction at J-PARC in the Materials and Life Science Facility (MLF) building will comprise four types of muon channels. In the first stage, a conventional superconducting decay muon channel (D-Line) was constructed, which can extract surface (positive) muons with an expected muon yield of 107/s and decay positive/negative muons up to 120 MeV/c, with an expected muon yield of a few 106/s at 60 MeV/c for both positive and negative muons. This channel will be used for various kinds of muon experiments like ?SR, muon catalyzed fusion and nondestructive elements analysis.

Strongest Pulsed Muon Source at J-PARC MUSE

The muon science facility (MUSE, abbreviation of MUon Science Establishment ), along with the neutron, hadron, and neutrino facilities, is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. On the November, 2009 beam cycle, we achieved extraction of the world’s strongest pulsed muon beam at J‐PARC MUSE by beam tuning at the Decay‐Surface muon beam line (D‐line). Surface muons (μ+) as much as 1.8×106/s were extracted with the use of 120 kW of protons from the Rapid Cycle Synchrotron (RCS), which corresponds to 1.5×107/s surface muons when a future proton beam reached at the intensity of 1MW. These intensities, at the future 1 MW operation, will correspond to more than ten times those at the RIKEN‐RAL Muon facility.