| Project/Area Number |
11694092
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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 |
素粒子・核・宇宙線
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| Research Institution | Tokyo Metropolitan University (TMU) |
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Principal Investigator |
HIROSE Tachishige TMU, Graduate school of science, Professor, 理学研究科, 教授 (70087162)
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| Co-Investigator(Kenkyū-buntansha) |
URAKAWA Junji KEK, Accelerator Lab, Associate professor, 加速器施設, 助教授 (00160333)
WASHIO Masakazu Waseda Uni., Advanced Research Inst. for Sci. & Engineering, Professor, 理工学総合センター, 教授 (70158608)
KUMITA Tetsuro TMU, Graduate school of science, Research associate, 理学研究科, 助手 (30271159)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2000: ¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1999: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | Compton chamber / CO2 laser / Plasma channel / Polarized positron beam / JLC / コンプトン散乱 / 非線形効果 / 短パルスX線 / TWレーザー / 炭酸ガスレーザー / ATFダンピングリング / 対生成 |
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| Research Abstract |
Studies at BNL
In order to attain laser-electon interaction with high luminosity, we constructed a Compton chamber in which laser is strongly focused and makes head-on collisions with electron. In October, 2000, we achieved the highest peak intensity of back scattered X-rays, 7x10^8 photons/sec in the collision of CO_2 laser with 60 MeV electrons. We have also developed plasma channel in which Compton scattering takes place for the laser beam confined in the channel. Thus the interaction length is elongated, resulting in the increase of the back scattered X-rays. We have successfully fablicated the plasma channel of 2 cm in length and 300 μm in radius having low density(10^<17>/cm^3).
Studies at KEK
We have been pursuing systematic studies on polarized positron productions through Compton scattering and pair creation processes. Gamma-rays of 2x10^5/pulse was created in Compton scattering of a 532 nm laser light off the 1.28 GeV electron. We also have made the conceptual design of the polarized positron beam for JLC which requires highly intensive positron beams with the intensity of 10^<10> e^+ /pulse and a complicated multibunch structure, i.e. 95 pulses with the time interval of 2.8 ns repeating 150 Hz. It is found that positrons 3x1^<10> /pulse can be generated using the electron beams of 5.8 GeV with the intensity of 5x10^<10> /bunch and 50 peices of CO_2 lasers.
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