Numerical calculations of the temperature distribution and the cooling speed in the laser-heated diamond anvil cell
Numerical calculations of the temperature distribution and the cooling speed in the laser-heated diamond anvil cell
复制标题
激光加热金刚石砧座中温度分布和冷却速度的数值计算
DOI：
10.1063/1.367239
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发表时间：
1998
影响因子：
3.2
通讯作者：
H. Yusa
中科院分区：
文献类型：
--
作者：
H. Morishima;H. Yusa
对金刚石对顶砧中激光加热样品的温度分布和冷却速度进行了数值计算。的分布进行了计算的可变实验参数，包括激光束的直径，砧间隙，和样品。结果表明，所有样品的径向温度分布均为高斯分布。用直径为100 μm的宽激光束加热时，样品的轴向温度梯度约为10 K/μm，而用直径为10 μm的窄激光束加热时，样品的轴向温度梯度约为102 K/μm。与窄束相比，宽束可以在径向和轴向方向上产生不太极端的温度梯度，而温度梯度强烈地取决于砧座间隙，尽管当使用窄束时这被最小化。当窄光束用于加热样品时，砧座底脚的表面温度可以保持在400 K以下;因此，窄光束适合在高压下加热样品，同时保持砧座温度较低。C...
Numerical calculations have been done to reveal temperature distributions and cooling speeds of laser-heated samples in a diamond anvil cell. The distributions were calculated for variable experimental parameters including the diameter of the laser beam, anvil gap, and sample. The results show that the radial temperature distribution in all samples is Gaussian. The axial temperature gradient is ∼10 K/μm in samples heated by a broad laser beam of 100 μm diameter, and is ∼102 K/μm when a narrow laser beam of 10 μm diameter is used. The broad beam can generate a less extreme temperature gradient in both radial and axial directions as compared with the narrow beam, whereas the temperature gradient strongly depends on the anvil gap, although this is minimized when a narrow beam is used. When the narrow beam is used to heat samples, the surface temperature of the anvil culet can be kept below 400 K; thus, the narrow beam is suitable for heating samples under high pressure while keeping anvil temperatures low. C...