ABSTRACT Thermal conductivities of planetary materials under extreme conditions are important input parameters for modeling planetary dynamics such as accretion, geodynamo and magnetic field evolution, plate tectonics, volcanism-related processes etc. However, direct experimental measurements of thermal conductivity at extreme conditions remain challenging and controversial. Here we propose a new technique of thermal conductivity measurement in laser-heated diamond anvil cell (LH-DAC) based on radial temperature distribution around laser focal spot, mapped by imaging tandem acousto-optical tunable filter (TAOTF). The new technique provides much more information about heat fluxes in the laser-heated sample than existing static heating setups, and does not require dynamic numerical modeling using heat capacities in contrast to dynamic pulsed heating setups. In the test experiment, thermal conductivity of γ-Fe at conditions relevant to cores of terrestrial planets was measured.

中文翻译：

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使用径向温度分布测量激光加热金刚石砧座中的热导率

摘要 极端条件下行星材料的热导率是模拟行星动力学（如吸积、地球动力学和磁场演化、板块构造、火山相关过程等）的重要输入参数。然而，在极端条件下直接实验测量热导率仍然具有挑战性和有争议的。在这里，我们提出了一种基于激光焦点周围径向温度分布的激光加热金刚石砧座 (LH-DAC) 热导率测量新技术，该技术通过成像串联声光可调滤波器 (TAOTF) 进行映射。与现有的静态加热装置相比，新技术提供了更多关于激光加热样品中热通量的信息，与动态脉冲加热设置相比，不需要使用热容的动态数值建模。在测试实验中，测量了 γ-Fe 在与类地行星核心相关的条件下的热导率。