首 页 >> 学术报告
 

光物理系列学术报告(第170期)

作者:佚名  来源:本站整理  发布时间:2018-11-6 16:33:56
 
题目: Extreme states of matter created by short-pulse high-intensity laser pulses
 
报告人:Prof. Dimitri Batani

               University of Bordeaux, France

摘要:
The study of extreme states of matter at high temperature and high pressure are interesting for many fields from planetology and astrophysics up to inertial fusion. Usually such states of matter are created by using high-energy ns-duration laser pulses creating shock waves which compress and heat the material to be studied.

In this talk, I present the results from two different experiments in which extreme states of matter are created using short-pulse high-intensity lasers.

The first experiment was conducted with the laser Phelix at GSI Darmstadt. We studied the interaction of a high-intensity laser with mass-limited Ti-wires. The laser was focused up to 7 × 1020 W/cm2, with contrast of 10−10 to produce relativistic electrons. High-spatial-resolution X-ray spectroscopy was used to measure isochoric heating induced by hot electrons propagating along the wire up to 1mm depth. Our measurements allowed distinguishing the surface target regions heated by mixed plasma mechanisms from those heated only by the hot electrons that generate warm dense matter with temperatures up to 50 eV. Our results are compared to simulations that highlight both the role of electron confinement inside the wire and the importance of resistive stopping powers in warm dense matter.

The second experiment was performed at LOA in Palaiseau with the goal of demonstrating shock generation with ultra- short (24 fs) and low-energy (J) laser pulse, following the energy deposition in the target by fast electrons. Due to the short duration of the pulse, this shock is not supported in time and takes the form of a blast wave travelling in the solid material. For a target with 50μm thickness we have clearly inferred the generation of pressure ≥100Mbar. We also show that such blast wave can be used to provide information on compressed matter. We have measured the colour temperature of the emitting target rear side at breakout time (T ≈ 0.6 eV), which resulted in good agreement with predictions from equation-of-state models (SESAME tables) and hydrodynamic simulations.

简介
Dimitri Batani, professor at Bordeaux University, has been coordinator of the WP10 (Fusion experimentalprogram) of the European Project HiPER. He is now responsible of the PETAL+ project for developing plasmadiagnostics for the LMJ/PETAL laser facility. He is member of the Institut Universitaire de France and of theEuropean Academy of Sciences (EURASC).
 
时间20181026星期五上午10:00
地点中科院物理研究所M255会议室
邀请人:李玉同 研究员(Tel:82648014)
联系人:陆  凌  研究员(Tel:82649203)
主办:中国科学院物理研究所光物理重点实验室

 
  本站公告
  • ·01-05 暂无公告
  •   研究小组
    光子晶体及其应用(L01)
    低维氧化物体系的设计、激光法制备及其物理研究(L03)
    太赫兹和超快光谱学(L04)
    超强激光作用下的高能量密度物理研究(L05)
    超短脉冲激光与精密测量物理(L07)

     

    Copyright @ 2002 中国科学院光物理重点实验室 All Rights Reserved
    电话: 86-10-82649442 传真: 86-10-82649442 Email: optics@iphy.ac.cn
    地址: 北京市海淀区中关村南三街8号, 北京603信箱27分箱, 邮编100190