| Project/Area Number |
10440123
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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 |
物理学一般
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
YAMAMOTO Shigeru Institute of Materials Structure Science, High Energy Accelerator Research Organization, Associate Professor, 物質構造科学研究所, 助教授 (20191405)
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| Co-Investigator(Kenkyū-buntansha) |
TSUCHIYA Kimichika Institute of Materials Structure Science, High Energy Accelerator Research Organization, Research Associate, 物質構造科学研究所, 助手 (40236906)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥12,600,000 (Direct Cost: ¥12,600,000)
Fiscal Year 1999: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1998: ¥8,700,000 (Direct Cost: ¥8,700,000)
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| Keywords | short period undulators / circularly polarizing undulators / in-vacuum type undulators / magnetic circuit for undulators |
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| Research Abstract |
In the fiscal year 1998, we developed a new magnetic circuit for the short period undulator for circularly polarized synchrotron radiation. The undulator for the circularly synchrotron radiation has a magnetic field which varies helically along the axis of the undulator. We adopted a pure-type magnet configuration in order to develop this type of magnetic field. Since the very short periods (10-20mm) of the undulator require very short gaps (around 5mm) between magnet arrays between which an electron beam pass through for realizing adequately strong magnetic fields, the entire magnet arrays need to be introduced into the vacuum system of an accelerator, for direct application of undulator magnetic field to the electron beam. We were able to develop the circularly polarizing magnetic circuit with the 20mm period to produce 3500Gauss at 4mm gap by utilizing knowledge and technical know-hows which we obtained when we constructed the in-vacuum type x-ray undulator with the 40mm period which was installed in the PF-AR at KEK, High Energy Accelerator Research Organization.
For an accurate and efficient measurements of the undulator magnetic field, we developed a magnetic measurement system which used Hall sensors with a small active areas. We also fabricated a flipping-coil type magnetic measurement system for quick measurement of the first integrals of the undulator field.
In the fiscal year 1999, we developed methods for measuring and tuning the undulator magnetic field having short periods. In this process we need to pay attention to cleanness of the surface of the magnet arrays, and developed the methods which were applicable to the short period in-vacuum undulator. In the arrangement process of the undulator field, we adjusted kick amount given to the electron at each pole and reduced their variance less than 0.2%. By the present study, we showed that short-period undulator magnetic circuit can be realized in the region of 10-20mm period length.
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