Thesis
Simulation studies of positrons behavior in a microtrap with long aspect ratio
Washington State University
Master of Science (MS), Washington State University
2012
Handle:
https://hdl.handle.net/2376/103360
Abstract
The capacity to store positrons in micro Penning-Malmberg(PM) traps with large length to radius aspect ratios and with radii of the order of microns is explored. Computer simulation studies of positrons behavior were conducted with EGUN program, Charged Particle Optics (CPO) program package and particle-in-cell plasma code WARP. The number density of the positrons in the microtrap can be increased as the radius of the trap is decreased, which is confirmed by the preliminary results from WARP simulation. A large number of micro PM traps with confinement voltage as low as 10V will be able to store comparable number of positrons (~1013) as conventional Penning-Malmberg traps which have several kV of confinement potentials. The effects from magnetic fields and the long term behavior of the kinetic energy are presented in the simulations of EGUN program. However, due to kinetic energy conservation issuesm , EGUN program is not a suitable simulation tool for current study. The long term simulation method is introduced in the simulations of CPO program. Limited by the CPO program, the long term behaviors of individual rays cannot be studied using this method. Finally, WARP code is used to investigate the equilibrium status of the plasma. The effects of different simulation parameters including time step, initial length of the plasma and mesh size, in WARP code are discussed. Further investigations will be conducted to achieve the thermal equilibrium of the plasma in the microtrap by reducing the oscillations in the radial direction inside the plasma.
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Details
- Title
- Simulation studies of positrons behavior in a microtrap with long aspect ratio
- Creators
- Jia Xu
- Contributors
- Kelvin G. Lynn (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525376401842
- Language
- English
- Resource Type
- Thesis