Speaker
Description
The Muon Science Facility (MUSE) at the Japan Proton Accelerator Research Complex (J-PARC MLF) generates intense pulsed muon beams (3 GeV, 25 Hz, up to 0.33 mA), which are used to study various elementary particle and material life. A muon production target is installed on the proton beamline between the 3 GeV synchrotron and the neutron target. The target is made of high-purity isotropic graphite IG-430U (Toyo Tanso), which is exposed to a strong radiation environment and heats up to high temperatures during beam irradiation.
In 2014, the fixed target was replaced by a rotating target, which is now operating smoothly at 800 kW. The ring-shaped graphite, 250 mm in inner diameter, 350 mm in outer diameter, and 20 mm thick, is divided into three sections to prevent failure due to thermal stress caused by thermal imbalance. By introducing a solid lubricant made from tungsten disulfide, we have achieved a long life of the rotating support under high heat, high radiation, and vacuum, which is expected to be about ten years. In the presentation, the current status of the target development and monitoring system will be reported.
| Themes for the contribution | 7 Operation of targets and beam dumps: |
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