Plasma wakes driven by photon bursts via Compton scattering

A nonlinear plasma retroreflector for single pulse Compton backscattering

Compton scattered x-rays can be generated using a configuration consisting of a single, ultra-intense laser pulse, and a shaped gas target. The gas target incorporates a hydrodynamically formed density spike, which nonlinearly scatters the incident pump radiation, to produce a counter-propagating electromagnetic wiggler. This self-generated wiggler field Compton scatters from electrons accelerated in the laser wakefield of the pump radiation. The nonlinear scattering mechanism in the density spike is examined theoretically and numerically in order to optimize the Compton scattered radiation. I…

Wakefield Acceleration in a Jet from a Neutrino Driven Accretion Flow around a Black Hole

We have investigated electro-magnetic (EM) wave pulses in a jet from a neutrino driven accretion flow (NDAF) around a black hole (BH). NDAFs are massive accretion disks whose accretion rates of $\dot{M}\approx 0.01 - 10 \mathrm{M}_\odot/\mathrm{s}$ for stellar-mass BHs. Such an extreme accretion may produce a collimated relativistic outflow like a magnetically driven jet in active galactic nuclei and micro-quasars. When we consider strong toroidal magnetic field stranded in the inner-region of a NDAF disk and magnetic impulses on the jet, we find that they lead to the emanation of high energy …

强场非线性康普顿散射中伽马射线偏振的实验确定

Experimental Determination of Gamma-Ray Polarization in Strong-Field Nonlinear Compton Scattering

本研究通过全光学非线性康普顿散射首次测量了伽马射线偏振，验证了强场量子电动力学的预测，展示了量子干涉效应的重要性。

Ultra-brilliance isolated attosecond gamma-ray light source from nonlinear Compton scattering

The explosion in attosecond technology has opened the gate to investigating many unexplored areas which require ultrahigh spatial and temporal resolution. In the area of nuclear physics, using gamma-rays with ultrahigh resolution in time and space will help to investigate intra-nuclear dynamics in an unprecedentedly explicit way. However, the generation of ultrahigh brilliance attosecond gamma-ray pulses with current-generation laser facilities has not been reported. In this letter, we propose a novel method to generate high charge (~1nC) attosecond (<200 attosecond) electron bunch by the near…

Quasi-monochromatic bright gamma-ray generation from synchronized Compton scattering via azimuthal spatial-temporal coupling

High energy photons can be generated via inverse Compton scattering (ICS) in the collision between energetic electrons and intense laser pulse. The development of laser plasma accelerators promises compact and all-optical gamma-ray sources by colliding the electrons from laser wakefield accelerators to its high-power driving pulse reflected by a plasma mirror. However, the law of optical focusing hinders realization of both high photon yield and monochromatic spectrum in this scenario. We propose an azimuthal spatial-temporal convertor that decouples the focal field strength from laser spot si…

An all-optical Compton source for single-exposure X-ray imaging

All-optical Compton sources are innovative, compact devices to produce high energy femtosecond X-rays. Here we present results on a single-pulse scheme that uses a plasma mirror to reflect the drive beam of a laser plasma accelerator and to make it collide with the highly-relativistic electrons in its wake. The accelerator is operated in the self-injection regime, producing quasi-monoenergetic electron beams of around 150 MeV peak energy. Scattering with the intense femtosecond laser pulse leads to the emission of a collimated high energy photon beam. Using continuum-attenuation filters we mea…

Global phase and frequency comb structures in nonlinear Compton and Thomson scattering

The Compton and Thomson radiation spectra, generated in collisions of an electron beam with a powerful laser beam, are studied in the framework of quantum and classical electrodynamics, respectively. We show that there are frequency regimes where both radiation spectra are nearly identical, which for Compton scattering relates to the process which preserves the electron spin. Although the radiation spectra are nearly identical, the corresponding probability amplitudes exhibit different global phases. This has pronounced consequences, which we demonstrate by investigating temporal power distrib…

浅相互作用角下的全光康普顿散射

All-optical Compton scattering at shallow interaction angles

本文研究全光康普顿源在浅相互作用角下产生10-100 keV X射线的散射几何方案，通过数值模拟分析电子束参数影响，发现相同发射度下光谱带宽与几何结构无关，并指出30度及以下浅角对医学成像和无损检测具有应用前景。

拍瓦级激光尾场加速器驱动的高亮度多MeV光子源

High brightness multi-MeV photon source driven by a petawatt-scale laser wakefield accelerator

实验演示了拍瓦激光驱动的高亮度多MeV伽马源，每脉冲产生10^9个光子，亮度比以往全光学源高百倍，由逆康普顿散射产生，模型可预测并优化辐射效率，适用于核物理研究。

由光子加速器注入的明亮多GeV康普顿伽马射线源

Brilliant multi-GeV Compton gamma-ray source seeded by a photon accelerator

提出利用等离子体尾场将激光光子加速至极紫外，再经等离子体镜反射至尾随电子束产生多GeV伽马射线，实现高峰值亮度（10^25）和高偏振度（圆偏振95%，线偏振77%）。