טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentVladimir Raikhlin
SubjectFerroelectric Plasma Source Modeling Using the Particle-
in-Cell Method
DepartmentDepartment of Physics
Supervisors Full Professor Krasik Yakov
Professor Emeritus Felsteiner Joshua
Full Thesis textFull thesis text - English Version


Abstract

We built a 2D particle-in-cell model to study the operation of a ferroelectric plasma source (FPS). FPS is a relatively new device used to produce a powerful pulsed electron beam with duration <1msec and a current density of a few tens of A/cm2. Due to its attractive performance, its compatibility with vacuum of 10-5-10-6 Torr, its reliability, and its long life, it is used in laboratories as an electron source. This source can also be used in the future for other applications. Its operation is poorly understood, as it involves complex phenomena that are difficult to treat analytically. Our model simulates plasma generation and expansion under typical experimental conditions which are characterized by specific geometry of the FPS, by the form of the driving voltage pulse and by the high-e dielectric, in the range of 100-1000 and higher. It includes surface charging, neutral desorption by impinging ions, and neutral ionization by electrons. The results of the research provide insights into the FPS operation, the plasma characteristics, and the conditions required to sustain the discharge. Qualitative agreement is found between our simulation results and experimental observations. Various computational and physical challenges are encountered and solved in this work.