Resonant Plasma Wave Growth and Monoenergetic Electron Beam Production using Collinear High-Intensity Ultrashort Laser Pulses

A quasi-monoenergetic short time duration compact proton source for probing high energy density states of matter

We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate, suitable for measurements of stopping power in high energy density plasmas as well as other applications. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted to a pencil-like narrow-band beam using a compact magnet-based energy selector. We experimentally demonstrate the production of a proton beam with an energy of 500 keV and energy spread well below 10%, and a pulse duration of 260 ps. The energy loss …

High charge plasma electron bunches from two collinear laser pulses

An optical injection scheme into the laser wakefield accelerator by preceding injection pulse is investigated by means of 3D numerical particle-in-cell simulations. Quasimonoenergetic hundred-pC electron bunches as short as 6 fs can be generated. Optimal beam separation distance is found at the intersection point of the injection beam bubble with the collection volume for transverse injection into the accelerator beam bubble. It approximately corresponds to the plasma wavelength. The main advantage of this scheme is the localized injection of high charge. This injection mechanism can be useful…

Tunable, all-optical quasi-monochromatic Thomson X-ray source

Brilliant X-ray sources are of great interest for many research fields from biology via medicine to material research. The quest for a cost-effective, brilliant source with unprecedented temporal resolution has led to the recent realization of various high-intensity-laser-driven X-ray beam sources. Here we demonstrate the first all-laser-driven, energy-tunable and quasi-monochromatic X-ray source based on Thomson backscattering. This is a decisive step beyond previous results, where the emitted radiation exhibited an uncontrolled broad energy distribution. In the experiment, one part of the la…

Staged laser acceleration of high quality protons from a tailored plasma

A new scheme of proton acceleration from a laser-driven near-critical-density plasma is proposed. Plasma with a tailored density profile allows a two-stage acceleration of protons. The protons are pre-accelerated in the laser-driven wakefields, and are then further accelerated by the collisionless shock, launched from the rear side of the plasma. The shock has a small transverse size, and it generates a strong space-charge field, which defocuses protons in such a way, that only those protons with the highest energies and low energy spread remains collimated. Theoretical and numerical analysis …

激光尾场加速中超有质动力注入产生超高亮度正电子束

Generation of Ultrabrilliant Positron Beam via Superponderomotive Injection in Laser Wakefield Acceleration

该研究提出激光尾场加速中超有质动力注入方法，通过粒子模拟验证产生低发射度多周期正电子束，为超高亮度正电子源提供新型紧凑途径。

激光等离子体场驱动的光核反应和激光驱动的DD聚变中子源用于快速中子捕获：从起点到终点的模拟研究

Laser-Wakefield-Driven Photonuclear and Laser-Driven DD Fusion Neutron Sources for Fast Neutron Capture: A Start-to-End Simulation Study

本文通过模拟比较了激光等离子体场加速驱动的光核中子源和DD聚变中子源，研究了其在r过程相关快速中子捕获中的应用，并提出了设计准则。