The next generation muon source at J-PARC/MLF

Abstract

The Materials and Life Science Facility (MLF) is currently under construction at J-PARC in Tokai, Japan. The muon section of the facility will house the muon production target and four secondary beam lines used to transport the muons into two experimental halls. Currently, one of the four beam lines (the Decay beam line) has been completed and is operational. The beam line currently under construction is the large acceptance beam line (the so called Super- Omega beam line) which, when completed, will produce the highest intensity pulsed muon beam in the world. The expected rate of surface muons for this beam line is 4×108 μ+/s, and a cloud muon rate of 107 μ-/s. The beam line consists of the normal-conducting capture solenoids, the superconducting curved transport solenoids, and an axial focusing magnet. The capture solenoids have been fabricated and installed on the beam line, while the transport solenoids are under design, with initial prototype coils under fabrication.