| Project/Area Number |
18340077
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
ISHIDA Taku High Energy Accelerator Research Organization, IPNS, Assistant Professor (70290856)
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| Co-Investigator(Kenkyū-buntansha) |
TADA Masaru KEK, IPNS, Assistant Professor (00391706)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥17,040,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2007: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2006: ¥8,200,000 (Direct Cost: ¥8,200,000)
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| Keywords | Experimental Particle Physics / Accelerator / radiation, X-ray, particle beam / Neutrino / T2K |
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| Research Abstract |
To carry out T2K, a next-generation long base-line neutrino oscillation experiment connecting 295 km from Tokai to Kamioka, is one of the main motivations to construct J-PARC. It employs a 50GeV proton synchrotron as a neutrino super-beam source, and Super-Kamiokande as a far neutrino detector. It can explore mass and mixing of neutrinos with unprecedented precision. It especially aims to observe tiny vμ-to-v_e appearance signal for the first time. A neutrino beam-line is under construction at the Tokai campus, and beam commissioning is scheduled in April, 2009. The purpose Of the project is to develop a hadron absorber system which can accept 1MW beam loss. It is vitally important for the future project of T2K to focus on the discovery of the CP violation in the lepton sector. The beam dump is located at the downstream of the decay volume, where a hadron absorber, the core of the beam dump, is installed together with iron shields. The design of the hadron absorber is as follows : It is composed of 14 core modules and a frame supporting them. It has a size of 3.1m x 5.4m x 3.2m, and total weight of 70t. A core module is composed of 7 large extruded graphite blocks, fastened to an aluminum cast plate with cooling water paths in it. To keep flatness of 0.1mm for the cooling surface and for the loading surface, 7 graphite blocks are machined together at once. A design with multiple spring washers is adopted to fasten graphite and aluminum, to minimize the reduction of joint force, i.e. heat convection between them, by temperature rise at beam operation. Following to the detailed design, we have produced the 1st core module successfully.
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