Simulation of Low Frequency Noise in a CCTWT
Abstract
The report describes the progress made studying the low frequency noise in a coupled cavity traveling wave tube. Simulations using the particle in cell code, XOOPIC, indicate that plasma is generated by the ionization of a background gas. The plasma is trapped in the potential depression of the beam, which is formed in the radial direction of the beam, which is formed in the radial direction by the radial space charge field, and in the axial direction due to scalloping of the beam in the external solenoidal magnetic field. As the Ion density exceeds the beam density, the ionization (plasma) electrons are observed to be expelled axially, followed in 20 ns by radial expulsion of the ions. The plasma then begins to build up again, and the oscillation repeats. The next step in the study is to include the microwave circuit in the simulation, to observe the impact of the oscillation on the output power. In addition, means of eliminating or controlling the oscillation will be studied.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 27, 1999
- Accession Number
- ADA363903
Entities
People
- Charles K. Birdsall
- J. P. Varboncoeur
- P. J. Christensen
Organizations
- University of California, Berkeley