对反场箍缩核聚变实验装置 KTX 真空室支撑结构强度进行理论分析，利用有限元方法进行了分析计算，并且根据分析结果，对支撑柱、螺栓组和支撑环板进行了优化。理论计算和有限元分析的结果均证明了真空室支撑系统的可靠性，同时优化结果也为KTX真空室支撑系统的实施提供技术参考。%The electron densities in the atmospheric pressure helium plasma were calculated by means of electron drift velocity and the jet velocity respectively. The electron velocity and jet velocity can be calculated by means of helium plasma jet current measured by a dielectric probe and plasma discharge current signal measured by voltage probes. The results show that the estimated electron densities of the helium plasma jet calculated from electron drift velocity and the jet velocity are in the order of 1011cm-3 and they increase with applied voltage. There is a little fluctuation in the value of the electron density along the jet axis of the plasma. This result is the same as the measured electron density in atmospheric pressure helium non-thermal plasma jet by using a Rogowski coil and a Langmuir probe. This is in one order lower than the electron density measured by microwave antenna.
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