Plasma Theory and Simulation.
Abstract
We have improved our method of loading particles in x,y so that the initial density n(x,y) is as near our theoretical equilibrium as possible. As a result, only a small amount of electron heating was observed in the first few cycles of upper hybrid oscillations. We have used small drift velocities (v subscript E less than or equal to v subscript ti) in our simulations to date, allowing electrostatic fields, zero beta. Unfortunately, this choice makes both the growth rates and saturation levels of the lower hybrid drift instability small, hence very difficult to simulate. We are using the multibeaming quiet start loader for ion particles. Both multibeam instabilities and the lower hybrid drift instability have been observed. A new diagnostic, gyrokinetic phase scattering plots, have been added to study the electron heating. We have been successfully subtracting the bar E times bar B drift corresponding to all the low frequency waves from the electron velocities. In our simulations, a small amplitude, slowly growing upper hybrid wave was observed. We found the electron gyro-kinetic energy, including electron slashing energy in the upper hybrid wave, increasing in time. However, comparing with ion temperature, electrons are still very cold.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1980
- Accession Number
- ADA104988
Entities
People
- Charles K. Birdsall
Organizations
- University of California, Berkeley