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Laser-plasma interaction at intensities beyond 1022 W/cm2 enters a new regime where gamma-photon emission and the induced radiation-reaction effect dominate. In extreme laser fields, high energy electrons emit gamma-photons efficiently, which take considerable portion of energy away and impose strong reaction forces on radiating electrons. When the radiation power is comparable to the electron energy gained in a certain period of time, the radiation-reaction (RR) effect becomes significant, which fundamentally changes the picture of laser-plasma interaction. In this review article, we introduce the physics of radiation-reaction force, including both classical description and quantum description. The effects of stochastic emission and particle spins in the quantum-electrodynamics (QED) RR process are discussed. We summarize the RR-induced phenomena in laser-plasma interaction and some proposed measurements of RR. As a supplement, we also introduce the latest progress of producing spin polarized particles based on laser-plasma accelerations, which provides polarized beam sources for verifying the QED-RR effects. In the classical picture, the RR force can be described by the Landau-Lifshitz (LL) equation, which eliminates the non-physical run-away solution from the Lorentz-Abraham-Dirac (LAD) equation. The damping force could induce the electron trajectories to instantaneously reverse, electrons to cool and even high energy electrons to be reflected by laser pulses. The latter leads to a “potential barrier” at a certain threshold that prevents the electrons of arbitrarily high energy from penetrating the laser field. In general, classical LL equation overestimates the RR effect, thus calling for more accurate quantum description. When the emitted photon energy is close to the electron energy, radiation becomes discrete. Quantum effects arise such that the process, also known as nonlinear multi-photon Compton Scattering, must be considered in the strong-field QED picture. This is resolved in the Furry picture by using the laser-dressed Volkov state in the local constant cross-field approximation (LCFA). The QED model is applied to particle dynamics via Monte-Carlo (MC) sampling. We introduce the prominent feature of quantum RR-stochastic photon emission. It allows the processes forbidden in classical picture to emerge, such as quantum ‘quenching’, quantum ‘reflection’, etc. These observables validate the strong-field QED theory. Recently, there has been a rising interest in identifying the spin effect in the QED-RR force. We summarize the latest progress of this topic, showing that when spins are coupled with photon emission the electrons of different spin states undergo distinctive RR force. The RR force has a significant effect on laser-plasma interaction. The review paper introduces recent QED-MC based PIC simulation results. Some key features include electron cooling in laser-driven radiation pressure acceleration and the radiation-reaction trapping (RRT) mechanism. In the RRT regime the laser pulse conveys over 10% of its energy to gamma-photons, facilitating the creation of a highly efficient gamma-ray source and electron-positron pair. In addition, the paper mentions the major efforts to measure the RR effect in recent years. It relies on high energy electrons either colliding with ultra-intense laser pulses or traversing crystals. Primitive observations indicate that existing theories do not match experimental results. Further investigation is required in both SF-QED theory and experiment. Finally, the review paper discusses the idea of laser-driven polarized particle acceleration as a supplement. The all-optical approach integrates pre-polarized gas target into laser wakefield acceleration, offering a compact all-optical polarized particle source, which is highly favorable for strong-field QED studies, high-energy colliders and material science. -
Keywords:
- ultra-intense laser /
- radiation-reaction /
- strong-field quantum electrodynamics /
- polarized particle acceleration
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图 1 在激光、电子对撞情况下, 激光强度(波长为800 nm)和电子能量对应的非线性量子参数
$ {\chi }_{\mathrm{e}} $ 和辐射反作用效应参数$ R $ Figure 1. The nonlinear quantum parameter
$ {\chi }_{\mathrm{e}} $ and radiation-reaction effect parameter$ R $ as a function of the laser intensity (at wavelength of 800 nm) and electron energy in the case of laser and electron collision.图 2 电子与激光对撞在方位角
$ \phi ={180}^{\circ } $ 处的角度能谱 (a) 无辐射反作用; (b) 有辐射反作用. 激光强度为$ 5\times {10}^{22}\;\mathrm{W}\cdot \mathrm{c}{\mathrm{m}}^{-2} $ , 电子能量为40 MeVFigure 2. Angle energy spectrum for electron and laser colliding at azimuth angle
$ \phi ={180}^{\circ } $ : (a) Without radiation reaction; (b) with radiation reaction. The laser intensity is$ 5\times {10}^{22}\;\mathrm{W}\cdot \mathrm{c}{\mathrm{m}}^{-2} $ and the electron energy is 40 MeV.图 3 不同电子能量
$ {\gamma }_{0} $ 与不同场强$ {a}_{0} $ 的激光对撞后电子被反射的比例 (a)基于LL方程的试探粒子模拟结果, 白线为(5)式给出的边界; (b)考虑量子修正因子(6)式的结果Figure 3. The ratio of electrons reflected after colliding with laser pulse at different electron energy
$ {\gamma }_{0} $ and laser field amplitude$ {a}_{0} $ : (a) From test particle simulations using the LL equation, the white line corresponds to the threshold defined in Eq. (5); (b) after considering the quantum correction factor according to Eq. (6).图 4 (a)
$ {\gamma }_{0}=1000 $ 的电子和不同脉宽激光对撞后辐射的光子数量,$ \tau $ 为激光周期数, 直线为Monte-Carlo模拟的结果, 点为解析结果[45]; (b)两种途径的光子数量相对误差[45]; (c) 不同激光参数下能谱的对比, 其中$ f=\delta $ , 灰色实线为QED结果, 虚线为Monte-Carlo结果. 垂直的虚线为第一阶非线性Compton的边界${f}_{\mathrm{C}}\approx 2\dfrac{{\chi }_{\mathrm{e}}}{{a}_{0}^{3}}$ [45]Figure 4. (a) The number of photons emitted by electrons of
$ {\gamma }_{0} $ =1000 head-on colliding with a laser pulse with different pulse width (τ is the pulse duration in laser period). Lines are the result from Monte-Carlo simulations while points are from analytical result[45]; (b) relative error of the photon number between the two approaches[45]; (c) comparison of energy spectra under different laser parameters where$ f=\delta $ . The solid gray line gives the QED result, and the dashed line is the Monte-Carlo result, respectively. The perpendicular dotted line is the boundary of the first order nonlinear Compton${f}_{\mathrm{C}}\approx 2\dfrac{{\chi }_{\mathrm{e}}}{{a}_{0}^{3}}$ [45].图 5 500 MeV电子与a0 = 100激光场对撞的电子轨迹, 黑线为QED-MC方法计算20次给出的轨迹, 红线、蓝线分别为Lorentz方程、LL方程的轨迹
Figure 5. Trajectories of electrons with 500 MeV colliding with a0 = 100 laser field. Black solid lines are the ones given by the QED-MC method (repeated 20 times at exactly the same condition). The red and blue solid lines are the trajectory from Lorentz equation and LL equation, respectively.
图 6 电子束与(a)中的激光对撞后的能谱变化, 其中激光强度约为
$ {a}_{0}=68 $ , 电子中心能量约为1 GeV[46]; (b) 量子随机辐射模型[46]; (c) LL方程[46]; (d) 量子修正的LL方程[46]Figure 6. The energy spectra after the electron beam collides with the laser in (a), where the laser intensity is about
$ {a}_{0}=68 $ and the electron center energy is about 1 GeV; (b) quantum stochastic radiation model; (c) LL equation; (d) the quantum-modified LL equation[46].图 8 (a)—(f) Lorentz方程、LL方程和QED光子辐射给出的两种电子能量下的运动轨迹, 其中红色箭头表示反常透射与反射的电子[21]; (g)—(i) 不同激光强度和电子能量下电子被激光反射的比例, 红色和蓝色方块而分别为第二列和第一列所对应的参数[21]
Figure 8. (a)–(f) Electron trajectories at two given values of kinetic energy, modelled by the Lorentz equation, the LL equation and the QED photon radiation. The red arrows represent anomalously transmitted and reflected electrons[21]. (g)–(i) Proportion of electrons reflected by the laser pulse at different laser intensities and electron energies. The red and blue squares correspond to the parameters in the second and first columns, respectively[21].
图 11 极化电子在激光场中的振荡
${\Delta }{p}_{x}$ 表示无自旋电子在半周期内由于辐射反作用产生的动量变化,$ \pm $ 表示相反的自旋极化方向[31]Figure 11. The oscillation of polarized electrons in laser field.
${\Delta }{p}_{x}$ represents the momentum shift of unpolarized electrons in a half cycle, plus or minus sign denote electron initially polarized parallel or anti-parallel to the laser magnetic field[31].图 13
$ {a}_{0}=500 $ 的激光和$ {n}_{\mathrm{e}}=20{n}_{\mathrm{c}} $ 的等离子相互作用, 在$ t=80{T}_{0} $ 时刻电子、质子、电磁场和$ \gamma $ 光子的分布[71] (a)—(c) 无辐射反作用; (d)—(g) 存在辐射反作用Figure 13. The distribution of electrons, protons, electromagnetic fields, and gamma photons at t = 80T0 when a laser of
$ {a}_{0}=500 $ interacts with a plasma of$ {n}_{\mathrm{e}}=20{n}_{\mathrm{c}} $ [71]: (a)–(c) with radiation reaction; (d)–(g) without of radiation reaction.图 14 (a) 不同场强下电子在驻波场中的密度分布, 电子的辐射过程采用QED-MC模型[72]; (b) 辐射模型为经典辐射[72]; (c) 不同场强下典型的电子轨迹[72]
Figure 14. (a) Density distribution of electrons in the standing wave field at different field intensities. Photon emission is modelled via QED-MC method[72]; (b) the result from classical radiation-reaction model[72]; (c) typical electron trajectories at different field intensities[72].
图 15 (a)有辐射反作用力情况下, 不同等离子体密度下电子的轨迹[77]; (b)辐射反作用力所做的功[77]; (c) 等离子体场的空间尺度、场强[77]. 图例中Eq.(4)是等离子体场电势
$ \phi ={E}_{x0}d/{\gamma }_{x} $ Figure 15. (a) Electron trajectories at different plasma densities[77]; (b) work done by the radiation reaction force; (c) length scale and field strength of plasma field at different plasma densities[77]. Eq. (4) is the electric potential of the plasma field
$ \phi ={E}_{x0}d/{\gamma }_{x} $ .图 16 能量为1 GeV的电子和
$ 5\times {10}^{22}\;\mathrm{W}\cdot \mathrm{c}{\mathrm{m}}^{-2} $ (${a}_{0}= $ $ 154$ )激光对撞产生的辐射谱[78]. 黑线和红色虚线为量子辐射情况下有、无辐射反作用的辐射谱线; 蓝色虚线和红色点线是经典理论给出的有、无辐射反作用的辐射谱线Figure 16. The radiation spectrum from the collision between 1 GeV electrons and
$ 5\times {10}^{22}\;\mathrm{W}\cdot \mathrm{c}{\mathrm{m}}^{-2} $ ($ {a}_{0}=154 $ ) laser pulse[78]. The black and red dotted lines are the spectra with and without radiation reaction in quantum radiation. The blue dotted and red dotted lines are the ones given by classical theory, with and without radiation reaction.图 20 高能正电子束穿过晶体后测量光子能谱及其与不同模型计算结果对比[88] (a)靶厚为3.8 mm; (b)靶厚为10.0 mm, 其中QRRM为量子辐射模型, QnoRRM为量子无辐射模型, SCRRM为半经典辐射模型, CRRM为经典辐射模型
Figure 20. Measured photon energy spectra generated by high-energy positron beam penetrating crystal and its comparison with theoretical results from different models[88]: (a) Target thickness of 3.8 mm; (b) target thickness of 10.0 mm. QRRM is the quantum RR model, QNorRM is the quantum model without RR, ScrRM is the semi-classical RR model, and CrRM is the classical RR model.
图 26 激光尾场加速横向预极化电子时电子束极化率的横向相空间分布, 分别对应纵向sx, 横向sy与sz, 初始自旋为sz方向[107]
Figure 26. The transverse phase space distribution of electron beam polarization in laser wakefield acceleration for transversely pre-polarized electrons(sz direction). Left to right: longitudinal polarization sx, transverse polarization sy and sz[107].
图 27 尾场加速横向预极化电子的(a)自旋过滤器示意图, (b)激光驱动和电子束驱动对比及(c)不同筛选角下极化率与归一化参数ψ的关系[107]
Figure 27. (a) Sketch of the spin filter, (b) beam polarization in laser driven and electron beam driven scenarios, and (c) the relationship between the polarization and the normalized parameter ψ at different screening angles[107].
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