Theoretical study of ultra-relativistic laser electron interaction with radiation reaction by quantum description

量子力学取扱うによる放射減衰を含む超相対論的レーザーと電子の相互作用の理論的研究

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

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

In the near future, the intensity of the ultra-short pulse laser will reach to W/cm. When an electron is irradiated by this laser, the electron's behavior is relativistic with a significant bremsstrahlung. This radiation from the electron is regarded as the energy loss of electron. Therefore, the electron's motion is changed because of the kinetic energy changing. This radiation effect on the charged particle is the self-interaction, called the "radiation reaction" or the "radiation damping". For that reason, the radiation reaction appears in laser electron interactions with an ultra-short pulse laser whose intensity becomes larger than W/cm. In the classical theory, it is described by the Lorentz-Abraham-Dirac (LAD) equation. We propose the new equation of motion in the quantum theory with a radiation reaction in this paper.