Distribution And Discharge Characteristics Of Plasma Induced By Strong Shock Solar Array

It is important to study the distribution and discharge characteristics of plasma induced by strong shock solar array for evaluating the damage of space debris to spacecraft and improving the protective measures.In order to reveal the influence of impact conditions under different impact loads on the spatial distribution and discharge characteristics of plasma,a strong shock loading system,a plasma characteristic parameter diagnosis system,a solar cell supply and discharge test system and a plasma cloud evolution test system were established;The experiment of plasma generation and discharge characteristics of 2A12 aluminum projectile under strong shock solar array with 30 degrees,60 degrees and 90 degrees collision angle(angle between trajectory and target plane)and impact velocity ranging from 2.7km/s to 3.3km/s was carried out by using two-stage light gas gun loading system.,and the following research results were obtained:(1)In the characteristic parameters of the strong shock-induced plasma,when the collision velocity is 3km/s and the collision angle is 60 degrees,the oscillation frequency of the generated plasma is between 2.153×109Hz to 4.027×109Hz,and the collision angle is 90 degrees.The oscillation frequency of the generated plasma is between 8.563 ×108HHz to 1.557×109Hz,and the greater the distance between the detection point and the target point,the smaller the temperature and density of the electrons generating the plasma;when the detection point is close to the target point,the larger the collision angle,the smaller the electron temperature and density of the plasma induced by the strong impact solar array.(2)In the spatial distribution of the characteristic parameters of the plasma induced by strong shock,the electron temperature and density of the induced plasma are approximately ellipsoidal distribution when the collision angle is 30 degrees and 60 degrees.When the collision angle is 90 degrees,the electron temperature and density of the plasma are approximately Sphere distribution;the greater the distance between the detection point and the target,the smaller the average expansion rate of the measured plasma cloud;the evolution of the plasma cloud captured by the hypervelocity camera gives the flash intensity increased with increasing plasma electron density.The evolution process of the two is similar.(3)In the discharge characteristic of the strong shock plasma,when the collision angle is 30 degrees and 60 degrees,there is a secondary discharge phenomenon.The peak of one discharge current is higher than the peak of secondary discharge current,and the duration of one discharge is longer than the duration of secondary discharge.When the collision angle is the same,the collision speed is higher.The smaller the duration of one discharge,the larger the peak value of one discharge current of the trunk and branch,and the peak value of one discharge current of the branch is larger than the peak of one discharge current of the trunk;when the collision speed is the same,the larger the collision angle,the strong impact solar energy The smaller the peak value of the primary discharge current and the branch current generated by the battery array,the longer the discharge duration.