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論文

Stabilization of radiation reaction with vacuum polarization

瀬戸 慧大*; Zhang, S.*; Koga, J. K.; 長友 英夫*; 中井 光男*; 三間 圀興*

Progress of Theoretical and Experimental Physics (Internet), 2014(4), p.043A01_1 - 043A01_10, 2014/04

 被引用回数:9 パーセンタイル:55.49(Physics, Multidisciplinary)

From the development of the electron theory by H. A. Lorentz in 1906, many authors have tried to reformulate this model. P. A. M. Dirac derived the relativistic-classical electron model in 1938, which is now called the Lorentz-Abraham-Dirac model. But this model has the big difficulty of the run-away solution. Recently, this equation has become important for ultra-intense laser-electron (plasma) interactions. For simulations in this research field, it is desirable to stabilize this model of the radiation reaction. In this paper, we will discuss this ability for radiation reaction with the inclusion of vacuum polarization.

論文

Possibility of radiation reaction observation under ultraintense laser

瀬戸 慧大*; Koga, J. K.; Zhang, S.*

レーザー研究, 42(2), p.174 - 178, 2014/02

Radiation reaction is one of the remaining big problems in theoretical physics. When an electron has high energy, radiation from this electron might become significant. Since this regime involves laser intensities over $$10^{22}$$ W/cm$$^2$$, we need to consider it under next generation laser-electron interactions. Moreover, this radiation reaction is studied as an electron model in classical physics. Therefore, the research of ultrahigh intense laser-high energy electron interactions has the potential to take us to the center and essence of physics. However, the Lorentz-Abraham-Dirac theory which is the standard model of radiation reaction, has a difficulty of the run-away solution. In this paper, the history of the researches of radiation reaction, our recent studies and the experimental design of this process will be presented.

論文

Theoretical study of ultrarelativistic laser-electron interaction with radiation reaction

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 田口 俊弘*; 三間 圀興*

EPJ Web of Conferences, 59, p.17020_1 - 17020_4, 2013/11

 被引用回数:0 パーセンタイル:0.1

When the laser intensity becomes higher than 10$$^{22}$$ W/cm$$^2$$, the motion of the electron becomes relativistic with the large radiation. This radiation energy loss transferred to the kinetic energy loss of the electron, is treated as an external force, the "radiation reaction force". We show the new equation of motion with radiation reaction and the simulation method and result of single electron system or dual electrons system with Li$'e$nard-Wiechert field interaction.

論文

Radiation reaction in ultrarelativistic laser-spinning electron interactions

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

Progress of Theoretical and Experimental Physics (Internet), 2013(5), p.053A01_1 - 053A01_10, 2013/05

 被引用回数:2 パーセンタイル:20.15(Physics, Multidisciplinary)

The intensity of ultra-short pulse lasers has reached $$10^{22}$$ W/cm$$^2$$ owing to the advancements in laser technology. The large radiation from the electron behaves something like resistance in this ultrarelativistic laser-electron interaction. This effect is called the "radiation reaction". The equation of motion with the radiation reaction is known as the Lorentz-Abraham-Dirac equation; however, this equation does not incorporate the spin property. In laser plasmas, classical physics descriptions are preferred for simulations. This paper discusses how to describe the radiation reaction of a spinning relativistic electron in classical dynamics.

論文

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

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

Plasma and Fusion Research (Internet), 7(Sp.1), p.2404010_1 - 2404010_4, 2012/02

In the near future, the intensity of the ultra-short pulse laser will reach to $$10^{22}$$ W/cm$$^2$$. 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 $$10^{22}$$ W/cm$$^2$$. 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.

論文

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

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

Physics of Plasmas, 18(12), p.123101_1 - 123101_8, 2011/12

 被引用回数:9 パーセンタイル:38.04(Physics, Fluids & Plasmas)

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.

口頭

Radiation reaction in ultra-relativistic laser-electron interactions

瀬戸 慧大*; 長友 英夫*; Koga, J. K.; 三間 圀興*

no journal, , 

If the laser intensity is higher than $$10^{22}$$ W/cm$$^2$$, strong bremsstrahlung might occur with a relativistic motion. Accompanying this, the "radiation reaction force" works on the charged particle. Therefore, it is necessary to study the radiation reaction effects in the ultra relativistic laser-electron interaction regime. We've considered the Lorentz-Abraham-Dirac (LAD) equation which can describe this phenomena, but it has mathematical difficulties. For solving this, there are many methods (the approximation of the radiation reaction force, new assumptions of the model). The LAD equation has been recently derived by the effective Lagrangian method in QED. This comes from the diagram of self-photon interaction. We will discuss about the meaning of the LAD equation and some other equations.

口頭

On nonlinear Compton scattering by high-intensity laser pulse

瀬戸 慧大

no journal, , 

Polarization-dependent nonlinear Compton scattering is discussed of an unpolarized electron in a high-intensity laser pulse of a linearly polarized plane wave. We developed the Monte Carlo calculation scheme employing the angular distribution formula of the photon emission in the locally constant field approximation that resolved photon energy, propagation direction, and polarization. The polarization feature shows how two polarization modes are different in the numerical result.

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