Energy transport processes in dense plasmas heated with intense thermal x-rays

自1982年以来，我们与德国马克斯·普朗克量子光学研究所合作，研究了激光产生X射线及其在腔中的限制的物理学。我们在绝对X射线能谱测量技术、高密度等离子体中的辐射输运物理和辐射动力学方面都取得了很大的进展。证明了激光产生的辐射在腔内受到限制，并实现了实验室最高辐射温度2.5兆开尔文的普朗克辐射。在本财政年度，研究了激光产生X射线产生的高密度等离子体中的能量输运物理，特别是辐射热波、冲击波和再发射的传播，并研究了其工业应用。从高强度X射线产生的工业应用的角度，由大阪大学激光工程研究所和马克斯·普朗克量子光学研究所举办了日本-德国飞秒激光和高强度应用研讨会。主要内容如下：(1)惯性约束聚变中的飞秒激光(2)固体表面的谐波产生(3)飞秒激光的发展(4)气体中的谐波产生(5)皮秒和飞秒激光脉冲传播(6)相对论激光与等离子体相互作用的数值模拟(7)固体对飞秒激光脉冲的吸收(8)相干和非相干X射线及其诊断(9)高强度场中的原子物理为了考察德国LASER2000项目，了解激光在工业上的应用现状，我们在研讨会结束后参观了汉诺威工业大学、汉诺威激光中心、柏林理工大学、柏林工业大学Max-Born研究所和一些工业公司。

Since 1982, collaborating with Max-Planck Institute of Quantum Optics in Germany, we have studying the physics of the generation of x-ray with lasers and its confinement in a cavity. We have made great progress on the measurement technique of absolute x-ray spectrum, the physics of radiation transport in high density plasmas and radiation hydropynamics. The confinement of the laser produced radiation in cavity has demonstrated and the Planck-radiation of 2.5Mega-degree Kelvin, which is the highest radiation temperature in laboratory, has achieved. In this fiscal year, the physics of the energy transport in high density plasmas produced by laser-produced x-ray, especially, propagation of radiation thermal wave, shock wave, and reemission are studied, and its industrial application is also investigated.From the view point of the industrial application of the high intense X-ray generation, the Japanese-German workshop on Femtosecond Lasers and High-Intensity Applications was organized by Institute of Laser Engineering, Osaka University and Max-Planck Institute of Quantum Optics. The main topics were as follows.(1) Femtosecond lasers in inertial confinement fusion(2) Harmonic generation from solid surfaces(3) Femtosecond laser development(4) Harmonic generation in gases(5) Pico-and femtosecond laser pulse propagation(6) Numerical simulation of relativistic laser-plasma interaction(7) Absorption of femtosecond laser pulses by solids(8) Coherent and incoherent x-rays and their diagnostics(9) Atomic physics in high intensity fieldTo investigate the project LASER2000 on Germany, and to know the status-quo of the laser application in industry, after the workshop, we have visited Hanover Technical University, Hanover Laser Center, Berlin Technical University, Max-Born Institute, and som industrial companies.