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Equation of motion with radiation reaction in ultrarelativistic laser-electron interactions

超相対論的レーザー・電子相互作用における放射反応を入れた運動方程式

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

Seto, Keita*; Nagatomo, Hideo*; Koga, J. K.; Mima, Kunioki*

The intensity of the ultra-short pulse lasers has reached 10$$^{22}$$ W/cm$$^2$$ owing to the advancements of laser technology. When the motion of an electron becomes relativistic, bremsstrahlung accompanies it. The energy from this bremsstrahlung corresponds to the energy loss of the electron; therefore, the motion of the electron deviates from the case without radiation. The radiation behaves something like resistance. This effect called "radiation reaction" or "radiation damping" and the force converted from the radiation is named the "radiation reaction force" or the "damping force". The equation of motion with the reaction force is known as the Lorentz-Abraham-Dirac equation, but the solution of this equation isn't physical due to the fact that it has a "run-away" solution. As one solution of this problem, we have derived a new equation which takes the place of the Lorentz-Abraham-Dirac equation. We'll show the validity of this equation with a simple theoretical analysis.

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パーセンタイル:38.04

分野:Physics, Fluids & Plasmas

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