Modeling intense-electron-beam generated plasmas using a rigid-beam approximation
Abstract
A model of an electron-beam–plasma system is introduced to model the electrical breakdown physics of low-pressure nitrogen irradiated by an intense pulsed electron beam. The rapidly rising beam current induces an electric field, which drives a return current in the plasma. The rigid-beam model is a reduction of the problem geometry to cylindrical coordinates and simplifications to Maxwell's equations that are driven by a prescribed electron beam current density. The model is convenient for comparing various reductions of the plasma dynamics and plasma chemistry while maintaining a good approximation to the overall magnitude of the beam-created electric field. The usefulness of this model is demonstrated by coupling the rigid-beam model to a fluid plasma model and a simplified nitrogen plasma chemistry. The dynamics of this coupled system are computed for a range of background gas pressures, and the results are compared with experimental measurements. At pressures 1 Torr and above, the simulated line-integrated electron densities are within a factor of two of measurements and show the same trend with pressure as observed in experiment.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 01, 2021
- Source ID
- 10.1063/5.0058006
Entities
People
- Andrew Richardson
- D. J. Watkins
- D. Mosher
- David D. Hinshelwood
- I. M. Rittersdorf
- N. D. Isner
- P. E. Adamson
- S. B. Swanekamp
- Tzvetelina Petrova
Organizations
- Defense Threat Reduction Agency
- Syntek Technologies
- United States Naval Research Laboratory