| 日時: |
2013-07-16 16:30 - 17:00 |
| 場所: |
4号館1階セミナーホール/東海1号館324室 |
| 会議名: |
物構研コロキウム Development of Ultra-Slow Muon Beam at J-PARC/MUSE |
| 連絡先: |
下村 浩一郎 5626 |
| 講演者: |
Patrick Strasser (KEK 物質構造科学研究所 ミュオン科学研究系) |
| アブストラクト: |
At the J-PARC Muon Science Facility (MUSE), a new ultra-slow muon beamline is now being constructed to extend the scope of the MuSR technique from bulk material to thin films, multi-layers, surfaces and extremely small samples, and enable not only for a wide variety of surface and nano-science studies, but also novel 3D imaging with the "ultra-slow muon microscope". The completed Super-Omega muon beamline (U-Line), which is currently producing the world strongest pulsed surface muon beam, will be used as the primary muon source. Intense ultra-slow muon beam will be produced by the re-acceleration of thermal muons regenerated by the laser resonant ionization of thermal Muonium atoms evaporated from the surface of a hot tungsten foil, a method that originated from the Meson Science Laboratory at KEK. To efficiently ionize Muonium atoms, a resonant ionization scheme via the "1s-2p-unbound" transition was adopted. A new state of the art all solid-state laser system developed by Wada et al. at RIKEN, produced the VUV light of 122.088 nm (Lyman-alpha) needed to induce the 1s-2p transitions. The re-accelerated beam (ultra-slow muon beam) has better energy resolution, time resolution and space distribution compared to initial surface muon beam, opening new frontiers in muon science. An overview of all the different aspects of this challenging project will be presented. |
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