气体靶密度的数值计算与实验研究

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Numerical calculation and experimental research of gas jet density

1.
College of Physical Science and Technology,Sichuan University,Chengdu 610064,China;
2.
Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China;
3.
Research Center of Laser Fusion,CAEP,P.O.Box 919-986,Mianyang 621900,China;
4.
Pohl Institute of Solid State Physics,Tongji University,Shanghai 200092,China

摘要: 采用了1维简单模型来模拟气体靶的空间密度分布情况，并且该计算值得到了实验的验证。使用M-Z干涉仪诊断锥型喷嘴喷射的气体靶密度分布，得到了不同压力和不同延时下的干涉图样。自行编写了实验数据处理程序，得到了不同情况下气体密度的空间分布。在相互作用实验中，由气体分子密度随压力的变化，可以确定合适的压力，以获得预期的气体靶密度；由气体分子密度随时间的变化，可以确定激光与气体的作用时刻。
- 气体靶 /
- 等离子体 /
- 密度 /
- Abel反演 /
- M-Z干涉法
Abstract: A one-dimensional model was constructed to calculate the gas density profile within a few millimeters of the conical nozzle. The result from the model is in agreement with experiments. A program was developed to deal with data taken by the M-Z interferometry, which measures the two-dimensional spatial distribution of the gas density profile in front of the conical nozzle. In the interaction experiment, we can choose a proper backing pressure to achieve expectant density, according to the scaling of density with backing pressure. And the scaling of density with relative delay time was expected to provide instructions in establishing the relative timing between firing the jet and the arrival of the laser pulse in interaction experiments.
- gas jet /
- plasma /
- density /
- abel transform /
- m-z interferometry

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