Influence Of Discharge Parameters On The Discharge Characters Of Coaxial Gun

The coaxial gun was designed by Marshall in the research of nuclear physics initially. As the plasma mass produced by coaxial gun possesses many unique characteristics, such as high density, high temperature, high speed and so on, coaxial gun is used in more and more fields recently, such as space propelling, accelerating the dust particle, the modification of the material surface and so on. These applications also make coaxial gun researched more widely. Currently the main interpretation about coaxial gun discharging is snowplow model. The circuit of coaxial gun discharging can be simplified as RLC circuit in the snowplow model, and the snowplow model point out that the plasma mass would go on ionizing the neutral particle and accelerating the ionized particle together. In this paper we mainly research the characteristics of the coaxial gun discharge based on the snowplow model, and how the discharge parameters influence the characteristics of the coaxial gun discharging. The main contents of this paper include three parts:1. We further know the characteristics of coaxial gun discharge according the wave form of current, voltage, light current, and research the relationship of the three quantificationally. In the experiment, we research the influence of discharge parameters on the amplitude and cycle of the current, voltage, light current wave form, this not only can help know the characteristics of the coaxial gun discharge more constitutionally, but also provide experiment evidence for explaining how the density of the advancing plasma mass change and how the discharge parameters influence blow-by.2. The density of plasma mass is a very important parameter which can describe the specialty of plasma. Basing Stark broadening not only can measure the density of plasma mass but also can study the density changing of the advancing plasma mass. As the energy of the plasma mass is very high, and the snowplow model point out that the plasma mass would ionize the neutral particle and accelerate the ionized particle together, so it’s very important to research how the density of plasma mass change and how the discharging parameters influence the change of density. This not only can verify the validity of snowplow model, but also can help choose appropriate position and parameters in the engineering field. In the experiment, we find that the density of plasma mass increase at the beginning, but then decrease. On the other side, the experimental result shows that the change of air pressure would influence the critical value. 3. By studying how the gradient of magnetic field influence blow-by, we first come up with the idea that the reinforcing feedback caused by the gradient of magnetic field is the main reason that result the blow-by. We can observe the degree of blow-by by photomultiplier in the experiment, and studied the influence of discharging parameters on blow-by by photomultiplier. The result show that the increasing of capacitance or the charging voltage of capacitance would enhance the degree of blow-by, while the increasing of gas pressure would weaken the degree of blow-by. All the result can be explained basing snowplow model and the reinforcing feedback model.