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Laser-driven $$gamma$$-ray source via radiation reaction effect

放射反作用を介したレーザー駆動$$gamma$$線源

中村 龍史; Koga, J. K.; Esirkepov, T. Z.; 神門 正城; Korn, G.*; Bulanov, S. V.

Nakamura, Tatsufumi; Koga, J. K.; Esirkepov, T. Z.; Kando, Masaki; Korn, G.*; Bulanov, S. V.

ペタワットを超えるレーザーと物質との相互作用では、電子運動における放射反作用の効果が無視できなくなる。放射反作用効果は、電子エネルギーの散逸を引き起こしそれが$$gamma$$線領域の光として放出される。このような$$gamma$$線の特性を解明するため、粒子コードに放射反作用効果を取り込み解析を行った。その結果、パラメータを適切に選ぶことで、短パスルかつ指向性を持った$$gamma$$線が発生できることが明らかとなった。光子数,パルス長等の特性を制御可能であることを示し、レーザー駆動$$gamma$$線源の提案を行った。

In the interactions of peta-watt class laser pulses and matters, a radiation reaction effect on an electron motion driven by the strong laser field plays an important role. The effect of radiation reaction is expected to lead to the generation of high flux of photons in the energy range of $$gamma$$-rays. In order to evaluate the detail of the $$gamma$$-ray characteristics and efficiency, we developed a Particle-in-Cell code incorporating the radiation reaction effect by using Landau-Lifshitz equation. From the numerical analyses, it is found that the generated $$gamma$$-ray pulse has quite unique features such as high power, short duration, high directionality, and high conversion efficiency when choosing the optimum conditions. We showed how to control the photon number, photon energy, pulse duration and so on. These studies lead us to propose a new source of laser-driven $$gamma$$-rays via radiation reaction effect.

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