学术报告第162期—甘睿 王祖涛论文投稿报告

时间：2022年5月20日 周五  15:00

地点：326会议室

线上会议：腾讯会议（726-265-206）

论文投稿报告

报告人：甘睿 研究生

导师：郑玮 副研究员

拟投期刊：Fusion Engineering and Design

题目：Design and implementation of a dynamical system simulation framework for plasma control system verification platform

摘要：The plasma control system (PCS) is a key part in tokamak operations, which requires test and verification. Dynamical system simulation tools have been widely utilized to build a simulation environment to verify the design of plasma control systems as well as other parts of tokamak systems under various operation scenarios and reduce the cost of real discharges. To provide a simulation platform based on open-source software as part of the infrastructure of the PCS-VP (Verification Platform) of the China Fusion Engineering Test Reactor (CFETR), a framework named DSSim (Dynamical System Simulation) is proposed. It is an environment for dynamical system simulation based on Python, which enables users to build and simulate hierarchical block diagram models with interconnected systems that corresponds to different dynamical systems. Solutions for special tasks that helps improve the accuracy of simulation like flattening the model hierarchy, scheduling system execution order and solving continuous systems are implemented and will be automatically invoked in different phases of simulation. A GUI client with the DSSim framework built in is developed to allow for constructing and simulating block diagram models in a more user-friendly way. A model of the vacuum field system of the Experimental and Advanced Superconducting Tokamak (EAST) is built and simulated with DSSim and the result is compared with that of the same model in MATLAB/Simulink to test the framework’s precision and usability.

报告人：王祖涛 研究生

导师：李传 讲师（学籍导师：张明 教授）

拟投期刊：Journal of Physics D: Applied Physics

题目：Atmospheric Pressure Plasma Jets: promoting CCN multiplication and aerosol activation

摘要：Enhance precipitation is of great significance to countries and regions with water shortages. Enough cloud condensation nuclei (CCN) is one of the necessary conditions for the formation of precipitation. In this paper, an argon plasma jet was used to generate charged particles, and the effects of the charged particles on CCN and aerosol activation were investigated. The results show that after the plasma jet was turned on for 30 minutes, the total number of CCN increased by 2.1 ~ 3.5 times. Even after the plasma jet is turned off, CCN in the cloud chamber remains at a high level. By measuring the total number of aerosols and CCN, the activation rate was calculated. It was found that the activation rate increased by 4 times after the plasma jet discharge. This paper speculates that this is due to a large number of electrons and ions generated by the plasma jet, which promotes aerosol charging. For ultrafine aerosols (＜80 nm), ion-ion recombination under the action of electrostatic force promotes the growth of aerosols to form CCN. For aerosols with the size of CCN ( > 80 nm), the increased attraction to water vapor after charging promotes aerosol activation as CCN. These experimental results demonstrate that it is feasible and practical to utilize plasma jets to promote the formation and activation of CCN, which has great significance for artificial weather modification.