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.
