Application of a gas tunnel to high‐energy‐density plasma beams
Application of a gas tunnel to high‐energy‐density plasma beams
复制标题
气体隧道在高能量密度等离子体束中的应用
DOI：
10.1063/1.337047
复制
发表时间：
1986
影响因子：
3.2
通讯作者：
A. Kobayashi
中科院分区：
文献类型：
--
作者：
Y. Arata;A. Kobayashi
通过实验研究了“气体隧道”中高温高能量密度等离子体束的特性。在高流量下的强涡流形成具有急剧梯度的径向压力分布。这在中心产生了一个“气体通道”，那里的压力非常低。在本研究中，这种气体隧道被应用于等离子体的产生，并且很容易获得高温和高能量密度的等离子体束。在这种气体隧道中产生的等离子体电弧具有比传统等离子体电弧更高的温度和电子密度，因为强的热箍缩效应。该等离子体电弧的性质的测量主要通过光谱学进行，并且发现即使在200 A的小电流下，在气体隧道中也获得几乎完全电离的等离子体。此外，通过增加电弧电流，获得了3×104 K以上的温度。在气体隧道中产生的等离子体射流具有超过40 V/cm的非常高的电势梯度和高的热效率，并且相对容易获得超过200 kW的极高功率。
The characteristics of high‐temperature and high‐energy‐density plasma beams in a ‘‘gas tunnel’’ were experimentally clarified. A strong vortex flow at a high flow rate forms a radial pressure distribution with a sharp gradient. This produces a ‘‘gas tunnel’’ in the center, where the pressure is very low. In this study, this type of gas tunnel was applied to the production of plasma, and high‐temperature and high‐energy‐density plasma beams were easily obtained. The plasma arc produced in this gas tunnel has a higher temperature and electron density than a conventional plasma arc because of a strong thermal pinch effect. Measurement of the properties of this plasma arc was primarily carried out by means of spectroscopy, and it was found that almost fully ionized plasma was obtained in the gas tunnel even at a small current of 200 A. In addition, a temperature of more than 3×104 K was achieved by increasing the arc current. A plasma jet generated in the gas tunnel has a very high electrical potential gradient of more than 40 V/cm and high thermal efficiency, and it is relatively easy to obtain an extremely high power of more than 200 kW.