Shunsuke Makimura

The first observation of slow muon beam at the RIKEN-RAL muon facility

We report successful observation of the first slow muon beam at the RIKEN-RAL muon facility. We adopted the laser resonant ionization method which had been developed at KEK to generate slow muons. The realization of the slow muon beam at the most powerful pulsed muon source in the world will open new possibilities for the studies of condensed matter with μSR techniques.

Ultra Slow Muon Microscope at MUSE / J-PARC

We report current constructing states of the Ultra Slow Muon Beam at U-line / MUSE / J-PARC, which are supported by thermal muonium (Mu, μ+e−) production with the most intense pulsed slow muon beam, laser resonant ionization, and transportation of Ultra Slow Muon Beam. A thermal Mu is produced by a hot tungsten foil in a Mu-production chamber. At the laser resonant ionization process, a thermal Mu is ionized by coherent vacuum ultraviolet radiation and coherent 355-nm radiation. The coherent radiation sources are developed at RIKEN, installed in a laser cabin, and connected via a VUV steering chamber with the Mu-production chamber.

Generation of slow muon beam by laser resonant ionization of muonium atoms

We report first results of re-acceleration of thermal muons, which were generated by laser resonant ionization of muonium atoms. The re-accelerated beam (slow muon beam) has better energy resolution and space distribution compared to initial surface muon beam, and its use will extend the scope of muon spin relaxation technique from bulk material to thin film, multi-layers, surfaces and extremely small samples. The yield of slow muons obtained during the first beam time was 0.03 muons/s.

Advanced SiC/SiC Rotating Target for DeeMe by NITE Method

Daisuke HAYASAKA, Chisato KANDA, Hirotatsu KISHIMOTO, Akira KOHYAMA, Shunsuke MAKIMURA and Masaharu AOKI Graduate-school of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan OASIS, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan 3 MLF-Division, Japan Proton Accelerator Research Complex, Tokai, Ibaraki 319-1106, Japan 4 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

Development of muon rotating target at J-PARC/MUSE

A pulsed muon beam with unprecedented intensity will be generated by a 3-GeV 333-micro A proton beam on a muon target made of 20-mm thick isotropic graphite at J-PARC. The current muon target with a fixed target method has been utilized without replacements since the first muon beam generation on September of 2008 till June of 2014. However, the proton irradiation damage to graphite is significant for our case. To extend the lifetime, the developments of the muon rotating target, in which the radiation damage is distributed to a wider area, have been performed.