Benchmarking collisional rates and hot electron transport in high-intensity laser-matter interaction

高强度激光-物质相互作用中碰撞率和热电子传输的基准测试

• 批准号: 2892813
• 金额: --
• 依托单位: Queen's University Belfast
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892813
• 关键词: Benchmarking; collisional; rates; hot; electron

"The interaction of high-intensity lasers with matter has been demonstrated as a versatile source of energetic protons with desirable characteristics (e.g. ultra-short durations) that cannot be achieved with conventional sources. These characteristics could facilitate societally-impactful applications such a high-dose rate radiobiology. During the acceleration of the protons, the laser energy is transferred to the proton beam via a multi-step processes in which the target material is rapidly ionised and a population of highly energetic electrons are produced. It is these 'hot' electrons that govern the evolution of the target material and the properties of the resultant proton beam determining its suitability for applications which also include medical isotope generation, materials testing and radiation damage testing, and exploration of fundamental high-energy density (HED) physics of relevance to astrophysics and fusion energy. Measurement of the evolution of the 'hot' electron population and the dense plasma target with femtosecond temporal resolution is crucial to accurately model the transfer of energy from the laser to the proton beam and to optimise these radiation sources to fulfil their potential. A novel diagnostic technique which allows femtosecond resolution measurements of the ultra-fast excitation and relaxation of a material has recently been demonstrated. This relies upon resonantly stimulated x-ray line emission, which is driven using high-brightness, narrow bandwidth x-ray pulses from an XFEL. By utilising facilities which combine an XFEL and a high-intensity laser, this diagnostic technique will allow unprecedented insight into the ultra-fast process of laser energy transfer to proton beams. In addition, by exploiting the new high-repetition rate capability of modern high-intensity lasers, it is possible utilise online feedback between the diagnostics and experimental controls to efficiently map the multi-dimensional parameter space of laser-driven proton acceleration and optimally exploit access to world-class facilities. The huge increase in high-value data that can be obtained via this methodology also enables inter-disciplinary work employing novel machine learning tools to enhance understanding of processes key to fundamental HED physics as well as deepening understanding of laser plasma accelerators thereby facilitating their development as tools for applications. "

"The interaction of high-intensity lasers with matter has been demonstrated as a versatile source of energetic protons with desirable characteristics (e.g. ultra-short durations) that cannot be achieved with conventional sources. These characteristics could facilitate societally-impactful applications such a high-dose rate radiobiology. During the acceleration of the protons, the laser energy is transferred to the proton beam via a multi-step processes in目标材料迅速被电离并产生高能电子的人群具有飞秒时间分辨率的“热”电子种群和密集的等离子体靶的演变对于准确对能量从激光器到质子束的传递进行建模至关重要，并优化了这些辐射源以实现其潜力。最近已经证明了一种新型的诊断技术，该技术允许飞秒的超快速激发和放松材料的放松测量。这依赖于共鸣的X射线线发射，该发射是使用XFEL的高亮度，狭窄的带宽X射线脉冲驱动的。通过利用结合XFEL和高强度激光器的设施，这种诊断技术将使对激光能量转移到质子束的超快速过程的前所未有的见解。此外，通过利用现代高强度激光器的新高重复速率能力，可以利用诊断和实验控制之间的在线反馈，以有效地绘制激光驱动的Proton加速度的多维参数空间，并最佳地利用对世界级设施的访问。可以通过这种方法获得的高价值数据的巨大增长还可以采用新型机器学习工具的跨学科工作，以增强对基本HED物理学的关键的理解，并加深对激光等离子体加速器的了解，从而促进其作为应用程序的工具的开发。 “