Conveners
Laser-driven particle accelerators and radiation sources: Laser-driven particle accelerators and radiation sources
- Jianxing Li (Xi'an Jiaotong University)
Free-electron radiation underpins modern light sources, from R\"ontgen's X-rays to today's fourth-generation X-ray free electron lasers (XFELs). When electrons interact with periodic electromagnetic environments, they emit radiation with a spectrum covering microwaves to X-rays. In recent years, the rapid progress of nanophotonics, advances in high-intensity lasers, and the cross-disciplinary...
We'll report the first demonstration of an ultra-widely tunable (1-20THz) superradiant THz free-electron laser (FEL) driven by high-peak-current electron microbunch trains. The emission efficiency is substantially improved as the ultra-short electron microbunches emit in phase and engage in strong interactions with the generated THz waves within the undulator. We further demonstrate that the...
The theory of Quantum electrodynamics (QED) is considered to be the most precise theory for electromagnet field. With the development of high-power laser technology, the experimental verification of strong field QED is possible. All-optical Compton scattering with dual-beam high-power femtosecond laser is one of the best testbed to study SFQED.
A dual-beam platform for all-optical...
The quantum electrodynamic (QED) theory predicts the photon emission and pair creation involved in QED cascades occur mainly in a forward cone with finite angular spread $\Delta\theta\sim 1/\gamma_i$ along the momenta of incoming particles. This finite beaming effect has been assumed to be negligible because of the particles' ultra-relativistic Lorentz factor $\gamma_i\gg 1$ in laser-driven...
Significant advances in the multi-petawatt laser technology have opened the door to the study of light-matter interactions in unexplored high-field regimes [1, 2]. Under such extreme conditions, strong-field quantum electrodynamics (QED) effects dominate and play a key role in collective plasma physics effects, resulting in a new class of QED plasmas [3, 4]. During the interaction, a large...
Recently, there has been a considerable progress in investigating the effects induced by quantum states of electrons and photons with a definite projection of angular momentum on a specific axis, known as twisted states [1]. In high energy physics, such states are used to induce nondipole transitions in nuclei [2-4], or to retrieve information about the phase of scattering amplitudes that is...
Advanced radiation sources demand high-brightness electron bunches. To date, such bunches are routinely provided by radiofrequency (RF) photoguns, where short laser pulses meet the photocathode surface and lead to photoelectron emission.
In RF photoguns, desired electron distributions within bunches are generated by inducing laser pulses of respective shapes. Some distributions, such as...
