The development of compact Z-polarization multi-bunch photocathode gun
| Project/Area Number |
20612024
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Quantum beam science
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| Research Institution | Japan Synchrotron Radiation Research Institute |
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Principal Investigator |
TOMIZAWA Hiromitsu Japan Synchrotron Radiation Research Institute, 加速器部門, 副主幹研究員 (40344395)
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| Co-Investigator(Kenkyū-buntansha) |
DEWA Hideki 財団法人 高輝度光科学研究センター, 加速器部門, 副主幹研究員 (20360836)
TANIUCHI Tsutomu 財団法人 高輝度光科学研究センター, 加速器部門, 副主幹研究員 (60360822)
MIZUNO Akihiko 財団法人 高輝度光科学研究センター, 加速器部門, 副主幹研究員 (30360829)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 軸対称偏光・ラジアル・アジマス偏光 / フェムト秒レーザー / ショットキー効果 / フォトカソード / Z偏光電子源 / RF電子銃 / X線自由電子レーザー(XFEL) / 次世代放射光加速器 / ラジアル・アジマス偏光 / Z偏光・フェムト秒レーザー / Z偏極電子源 |
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| Research Abstract |
We have developed a novel photocathode gun gated by laser-induced Schottky-effect since 2006. This new type of gun utilizes a laser's coherency to aim at a compact femtosecond laser oscillator as an IR laser source using Z-polarization on the photocathode. This Z-polarization scheme reduces the laser pulse energy by reducing the cathode work function due to Schottky effect. A hollow laser incidence is applied with a hollow convex lens that is focused after passing the beam through a radial polarizer. According to our calculations (convex lens : NA=0.15), a Z-field of 1 GV/m needs 1.26 MW at peak power for the fundamental wavelength (792 nm) and 0.316 MW for the SHG (396 nm). In the first demonstration of Z-field emission enhancement was done with copper cathode at THG (264 nm). Consequently, we observed 1.4 times enhancement of photoemission at 1.6 GV/m of an averaged laser Z-field on the copper cathode surface by comparing radial and azimuthal polarizations.
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Report
(4 results)
Research Products
(31 results)
