In my research portfolio, I explore two pioneering projects. First, in the domain of plasma physics, I employ the Monte Carlo method to simulate electron-ion collisions, revealing insights into collision dynamics and their relationship with plasma parameters. Second, I introduce Gamma Ray Ranging, a novel distance measurement technique for spacecraft landings, demonstrating its precision through experiments and highlighting its potential in aerospace applications. These projects collectively contribute to advancing our understanding of plasma physics and offer a promising solution for precise distance measurement in aerospace scenarios.
Project 1: First-Principles Simulation of Plasma Collisions
This project, as a subject of the University Student Research Project, has been rated as “Excellent” by the School of Nuclear Science and Technology.
Summary:
In the study of plasmas, collisions play a pivotal role in phenomena such as diffusion and transport. However, comprehensively understanding and accurately studying collisions present challenges. Previous investigations often commence with analytical equations, such as Fokker-Planck equations and the BBGKY equation hierarchy. Collison operators are derived by adopting theories like binary collision theory and wave theory, which rely on assumptions that may not be entirely accurate or appropriate. Therefore, a thorough exploration of collisions from a first principles simulation approach is essential.
This research employs the Monte Carlo method to simulate collisions, aiming to provide an accurate representation of collision dynamics. The simulation considers various effects, including Debye shielding and many-body interactions. The collision time is defined by observing the decreasing rate of \(\bar{v}\). The study calculates collision times for several typical plasma systems and investigates how these times vary with plasma parameters. Additionally, the research delves into the variation in the error between theoretical collision times and simulated collision times under different circumstances.
To further explore the implications of collision dynamics, the study introduces test particle momenta obeying a specific distribution. Diffusion and transport coefficients are calculated based on these distributions and compared with theoretical values. This comprehensive approach not only enhances our understanding of collision processes in plasmas but also provides insights into the relationship between collision times, plasma parameters, and the accuracy of theoretical predictions.
Category: First-Principles Simulation of Plasma Collisions
Publication: Not yet.
Project 2: Gamma Ray Ranging for Spacecraft Landings
This research was independently conducted by me and my collaborator Jialu Xu during the first semester of our junior year in the “College Physics Experiment” course. We conducted a survey of the experimental background, designed the experimental procedure, and utilized teaching instruments for our experiments.
Summary:
This research introduces Gamma Ray Ranging, a novel distance measurement technique utilizing gamma sources and scintillation detectors, and explores its application in spacecraft landings. The experimental methodology entails precise measurement and correction of light intensity, enabling the establishment of a relationship curve between light intensity and distance. Essential equipment such as gamma sources, receivers, copper sheets, and laser pens is detailed. The study presents experimental results, including a corrected light intensity-distance curve, highlighting the advantages of the Monte Carlo method and simulation processes. Lastly, the research demonstrates the viability of Gamma Ray Ranging in spacecraft landing applications by measuring the distance of an earth sample to the detector. This contributes valuable insights to the field, offering a robust framework for accurate distance measurement in aerospace scenarios.
Category: Gamma Ray Ranging
Publication: Not yet.