2016 Fiscal Year Research-status Report
Relativistic Flying Mirror Gamma Ray Source
| Project/Area Number |
16K05639
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| Research Institution | National Institutes for Quantum and Radiological Science and Technology |
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Principal Investigator |
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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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | plasma mirror / relativistic |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
The funds were sufficient for the computer resources and travel expenses that we needed.
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| Expenditure Plan for Carryover Budget |
We plan to use these carryover funds partly for computer resources, travel fees, and software.
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