| Project/Area Number |
09304042
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NODA Akira Kyoto University, Institute for Chemical Research, Professor, 化学研究所, 教授 (20114605)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Makoto Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (90028176)
SHIRAI Toshiyuki Kyoto University, Institute for Chemical Research, Instructor, 化学研究所, 助手 (50252507)
IWASHITA Yoshihisa Kyoto University, Institute for Chemical Research, Associate Professor, 化学研究所, 助教授 (00144387)
OKAMOTO Hiromi Hiroshima University, Graduate School of Advance Sciences of Matter, Associate Professor, 大学院・先端物質科学研究科, 助教授 (40211809)
SETO Makoto Kyoto University, Research Reactor Institute, Associate Professor, 原子炉実験所, 助教授 (40243109)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥24,000,000 (Direct Cost: ¥24,000,000)
Fiscal Year 1999: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1998: ¥11,700,000 (Direct Cost: ¥11,700,000)
Fiscal Year 1997: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | Electron Beam / Duty Factor / Slow Beam Extraction / Pulse Stretcher / Third Order Resonance / Control of the Closed Orbit / Electrostatic Septum / Septum Magnet / パラメトリックX放射 |
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| Research Abstract |
Stretcher mode of the electron storage ring, KSR has been designed and equipment needed for the mode have been fabricated. In the stretcher mode, the output beam from the 100 MeV electron linac is injected into the KSR by 3-turn injection and then slowly extracted in about 1 second by the method utilizing the third order resonance together with RF knock out method. With such a scheme, the duty factor of the electron beam is expected to be increased from 2×10ィイD1-5ィエD1to 〜90%.
In the first fiscal year 1997, the design of the stretcher mode of KSR is determined fixing the operating point of the KSR. Then the electrostatic septum as the first septum for the slow extraction system was fabricated. Its high-voltage power supply was also purchased.
In the second fiscal year 1998, a septum magnet to be used at the down stream of the electrostatic septum was designed and fabricated. Taking the fact that the ultra-high vacuum better than 10ィイD1-9ィエD1 Tore, the septum coil was designed to be located outside the vacuum system.
In 1999 as the final fiscal year for the research project, the electrostatic septum and the septum magnet have been installed into the KSR after evaluation of their characteristics. After the baking process, the vacuum pressure has reached required region of 10ィイD1-9ィエD1 Tore. The high voltage up to 70 kV/cm has been applied to the electrostatic septum with the condition without beam bombardment to the septum foil. Through the beam test up to now, the beam life of the stretcher mode was measured to be several tens second, which is long enough for the operation as the stretcher. The RFKO process is also found to be effective to increase the bettor oscillation amplitude. Quantitative measurements of the extraction efficiency and the time structure of the extracted beam are scheduled from now on.
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