报告详情
Laboratory investigation of particle energization in laser-driven magnetized shocks and associated instabilities
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更新：2024-04-22 23:09:39 浏览：97次
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摘要
The origin of the high-energy non-thermal particles flying through the Universe is still an open question. Well-known sources are collisionless shock waves and their associated instabilities. By interacting with the ambient medium, these shocks, the collisions between them, together with the turbulence induced from the associated instabilities, can transfer their bulk kinetic energy to non-thermal particles through electromagnetic fields. Here we show that super-critical magnetized collisionless shocks, as well as the magnetic Rayleigh-Taylor instability (MRTI), can be produced and characterized in the laboratory coupling high-power lasers with strong (> 20 T) and stable (> 100s of ns) magnetic fields. More importantly, high-energy non-thermal protons have been measured during these processes, providing the first direct evidence of early stage non-thermal proton energization by the collisionless shocks and the turbulence induced by the MRTI. Both kinetic Particle-in-cell (PIC) and extended magnetohydrodynamics (MHD) simulations (as well as the integrated MHD-PIC one) have been used to identify the ion energization mechanisms and to reproduce the experimental observations. This platform opens the door to future laboratory experiments, in the regime of magnetized high-energy-density plasma (HEDP), investigating the possible transition to other mechanisms, and shed light on the related astrophysical phenomena.
The origin of the high-energy non-thermal particles flying through the Universe is still an open question. Well-known sources are collisionless shock waves and their associated instabilities. By interacting with the ambient medium, these shocks, the collisions between them, together with the turbulence induced from the associated instabilities, can transfer their bulk kinetic energy to non-thermal particles through electromagnetic fields. Here we show that super-critical magnetized collisionless shocks, as well as the magnetic Rayleigh-Taylor instability (MRTI), can be produced and characterized in the laboratory coupling high-power lasers with strong (> 20 T) and stable (> 100s of ns) magnetic fields. More importantly, high-energy non-thermal protons have been measured during these processes, providing the first direct evidence of early stage non-thermal proton energization by the collisionless shocks and the turbulence induced by the MRTI. Both kinetic Particle-in-cell (PIC) and extended magnetohydrodynamics (MHD) simulations (as well as the integrated MHD-PIC one) have been used to identify the ion energization mechanisms and to reproduce the experimental observations. This platform opens the door to future laboratory experiments, in the regime of magnetized high-energy-density plasma (HEDP), investigating the possible transition to other mechanisms, and shed light on the related astrophysical phenomena.
The origin of the high-energy non-thermal particles flying through the Universe is still an open question. Well-known sources are collisionless shock waves and their associated instabilities. By interacting with the ambient medium, these shocks, the collisions between them, together with the turbulence induced from the associated instabilities, can transfer their bulk kinetic energy to non-thermal particles through electromagnetic fields. Here we show that super-critical magnetized collisionless shocks, as well as the magnetic Rayleigh-Taylor instability (MRTI), can be produced and characterized in the laboratory coupling high-power lasers with strong (> 20 T) and stable (> 100s of ns) magnetic fields. More importantly, high-energy non-thermal protons have been measured during these processes, providing the first direct evidence of early stage non-thermal proton energization by the collisionless shocks and the turbulence induced by the MRTI. Both kinetic Particle-in-cell (PIC) and extended magnetohydrodynamics (MHD) simulations (as well as the integrated MHD-PIC one) have been used to identify the ion energization mechanisms and to reproduce the experimental observations. This platform opens the door to future laboratory experiments, in the regime of magnetized high-energy-density plasma (HEDP), investigating the possible transition to other mechanisms, and shed light on the related astrophysical phenomena.
关键词
charged particle acceleration,collisionless shocks,plasma instabilities,magnetized plasma
报告人
Weipeng YAO
CNRS；LULI稿件作者
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重要日期
-
会议日期
05月13日
2024
至05月17日
2024
-
03月31日 2024
注册截止日期
-
04月15日 2024
摘要截稿日期
主办单位
冲击波物理与爆轰物理全国重点实验室
浙江大学物理学院
中国核学会脉冲功率技术及其应用分会
浙江大学物理学院
中国核学会脉冲功率技术及其应用分会
联系方式
- Mrs. 黄颖
- ic******@mre.org.cn
- +86*********
历届会议
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2019年05月29日 中国 Hefei
第四届极端物质与辐射国际会议 -
2017年06月01日 中国 Beijing,China
第二届极端物质与辐射国际会议
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