| 研究課題/領域番号 |
16K05639
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| 研究機関 | 国立研究開発法人量子科学技術研究開発機構 |
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研究代表者 |
Koga James 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 光量子科学研究部, 上席研究員(定常) (70370393)
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| 研究分担者 |
Esirkepov Timur 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 光量子科学研究部, 上席研究員(定常) (10370363)
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| 研究期間 (年度) |
2016-04-01 – 2019-03-31
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| キーワード | plasma mirror / relativistic |
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| 研究実績の概要 |
We found a new regime in relativistic flying mirrors where there is higher reflectivity of the source pulse when it has significantly longer wavelength than the driver laser. In this case the driver pulse can be in a significantly under-dense plasma resulting in high up-shift factor while the source is in a near critical plasma allowing for greater reflection with relatively small density perturbations. High resolution one dimensional particle-in-cell simulations show higher reflectivity with lower up-shift factors and normal high up-shift factors with lower reflectivity. We found that if the density modulations are shorter than the wavelength of the source pulse then reflection can occur even before the wake wave breaking, because such density modulations break the geometric optics approximation. In addition we have found that it is possible to achieve the radiation reaction dominant regime with current or near future lasers. By using relativistic flying mirrors to up-shift the laser pulses the reflected laser pulses having nearly the same power as the source pulse can approach the regimes where electrons interacting with them can be in the radiation dominant regime where most of their initial energy can be damped.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
In order to resolve the full spectral range of the reflected pulses in the newly discovered regime ultrahigh resolution simulations were needed. These were only possible in one dimension and not in higher dimensions with fixed frame simulations.
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| 今後の研究の推進方策 |
We plan to continue with higher dimensional simulations concentrating on using the moving simulation frames to resolve both the higher reflectivity lower up-shift pulses and higher up-shift lower reflectivity pulses and also on the radiation reaction dominant regime of interaction. We will continue to develop the theory of these.
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| 次年度使用額が生じた理由 |
The funds were sufficient for the computer resources and travel expenses that we needed.
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| 次年度使用額の使用計画 |
We plan to use these carryover funds partly for computer resources, travel fees, and software.
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