High laser field effects and laser-produced plasmas in a near QED regime

近 QED 区域中的高激光场效应和激光产生的等离子体

• 批准号: RGPIN-2016-04173
• 负责人: Kieffer, JeanClaude
• 金额: $ 5.39万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=691714
• 关键词: laser; field; effects; produced; plasmas

The proposed scientific program aims to explore laser-produced plasmas in a regime close to the Quantum Electrodynamics (QED) effects intensity threshold (around 1023W/cm2) that can now be reached with the new generation of high peak power ultrafast lasers. The applicant upgraded the high peak power laser, from 200TW to 750TW, at the Advanced Laser Light Source (ALLS) facility at INRS in Varennes (Qc). This new infrastructure is ready (October 2015) with higher energies (up to 12J) in shorter (16fs) pulse duration. It will provide an unprecedented opportunity to achieve intensities on target close to 1023W/cm2 and explore high field frontier science. The new ALLS infrastructure and the proposed research program will help to maintain Canada at the forefront of a very competitive and novel science. The proposed program includes two major directions related to the interaction of very high laser fields with plasmas and is seen as a background for more complex experiments with more powerful lasers (multi-PW) at higher intensities in the QED regime. ***The first sub-program aims to explore, in a controlled geometry, the effect of strong longitudinal oscillating electric fields on electrons in plasma. Such fields will be a key component in the complex strong field QED regime. We will study electron acceleration directly by the longitudinal field created by the tight focusing of the radially polarized (TM01 mode) 750TW beam. Electrons will be either produced and accelerated directly by the main laser pulse from mass limited targets positioned inside the focal spot or accelerated from a plasma preformed by a first beam and injected with appropriate delay in the focal volume. Scaling laws as a function of the laser pulse duration (down to near single cycle pulse) and of the focusing numerical aperture will be established to benchmark modeling. *** The second sub-program is on the generation and study of plasmas in a radiation-dominated regime. Hot dense matter heated to extreme temperature (specific energy densities >106MJ/kg) will be produced from extremely thin foils to study the unexplored regime of atomic physics in radiation-dominated regime and in regimes where very high E and B oscillating fields are key parameters. Atomic physics (ionization dynamics, equilibrium) and the generation and effect of short wavelength radiation (up to the gamma-ray range) will be studied with high-resolution X-ray spectroscopy. Plasmas dynamics will be probed on the femtosecond time scale using femtosecond betatron radiation to realize the first ever femtosecond time resolved X-ray absorption spectroscopy of

拟议的科学计划旨在探索接近量子电动力学（QED）效应强度阈值（约1023W/cm2）的制度中的激光生产的等离子体，现在可以通过新一代的高峰值超级快速激光器来达到。申请人在Varennes（QC）INRS的高级激光源（Alls）设施中将高峰值激光器从200TW升级到750tw。这种新的基础架构已准备就绪（2015年10月），较短（16FS）脉冲持续时间较高的能量（最多12J）。它将提供一个前所未有的机会，以在接近1023W/cm2的目标上实现强度并探索高野战边界科学。新的Alls基础设施和拟议的研究计划将有助于将加拿大保持在竞争激烈和新颖的科学的最前沿。提出的程序包括与高激光场与等离子体的相互作用有关的两个主要方向，并被视为具有更复杂的实验的背景，具有更强大的激光器（Multi-PW），在QED制度中较高强度。 ***第一个子程序旨在在受控的几何形状中探索强纵向振荡电场对等离子体中电子的影响。此类字段将是复杂强场QED制度中的关键组成部分。我们将通过径向极化（TM01模式）750TW梁的紧密聚焦而直接研究电子加速度。电子将直接由位于焦点内的质量有限靶标的主激光脉冲直接产生和加速，或者是从由第一束前束预先形成的等离子体加速的，并在焦点体积中注射了适当的延迟。将标准定律随激光脉冲持续时间（降至接近单周期脉冲）和聚焦数值孔径的函数，以确定基准建模。 ***第二个子程序是在辐射主导的方向中的等离子体的产生和研究。热量加热至极端温度（特定能量密度> 106MJ/kg）将从极薄的箔中产生，以研究辐射主导的制度中原子物理的未开发的制度以及在非常高的E和B振荡领域的机制中，是关键参数。原子物理学（电离动力学，平衡）以及短波长辐射（至伽马射线范围）的产生和影响将使用高分辨率的X射线光谱进行研究。血浆动力学将使用飞秒betatron辐射在飞秒时间尺度上进行探测，以实现有史以来的第一个飞秒时间解决的X射线吸收光谱。