Observation of ion species energy dependence on charge-to-mass ratio in laser-driven magnetic reconnection experiment

IF 0.9 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS High Energy Density Physics Pub Date : 2024-08-19 DOI:10.1016/j.hedp.2024.101137

K.F.F. Law , J. Dun , Y. Abe , A. Morace , Y. Arikawa , Ph. Korneev , J.J. Santos , S. Fujioka

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Abstract

Magnetic reconnection, a critical process in plasma physics, involves the reconnection of magnetic field lines, leading to the release of energy and acceleration of particles. This phenomenon is pivotal across various fields such as astrophysics, fusion energy research, and space weather forecasting. In this study, we conducted an experiment on magnetic reconnection using a laser-driven micro-coil to generate bi-directional currents. Analysis of the ion energy distribution from the reconnection outflow revealed that the maximum energy for each ion species correlates with a common gyroradius within the reconnection field, with spectral shapes across different ion species — excluding protons — showing uniformity after normalization by the square of their charge-to-mass ratio. These findings align with the hypothesis of large-scale magnetic field turbulence at the acceleration site, indicative of a strongly driven magnetic reconnection system.

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在激光驱动的磁重联实验中观测离子物种能量与电荷质量比的关系

磁再连接是等离子物理学中的一个关键过程，涉及磁场线的再连接，导致能量释放和粒子加速。这一现象在天体物理学、核聚变能源研究和空间天气预报等多个领域都举足轻重。在这项研究中，我们利用激光驱动的微型线圈产生双向电流，进行了磁重联实验。对来自再连接外流的离子能量分布的分析表明，每种离子的最大能量与再连接场内的共同回旋半径相关，不同离子种类（不包括质子）的光谱形状在按其电荷质量比的平方归一化后显示出一致性。这些发现与加速点的大尺度磁场湍流假说相吻合，表明存在一个强驱动的磁再连接系统。

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.