Physical Foundations of Plasma Microwave Sources Based on Anomalous Doppler Effect
Abstract
This project is concerned microwave relativistic plasma electronics, dealing with problems of converting the energy of intense electron beams into high power coherent electromagnetic radiation. This is one of the main topics of AFOSR's interests on basic research in physics and electronics. Plasma filling of microwave devices allows operating at higher beam currents and gradually changing frequency of output radiation. In addition plasma mitigates voltage depression and improves characteristics of output radiation. The theory of plasma-filled microwave devices is constructed for infinitely strong external longitudinal magnetic field. Authors of the theory are among the authors of the present project. They have great experience in physics of microwave devices on relativistic electron beam, as well as in physics of high current beam, plasma physics, and beam-plasma interaction. In the framework of present project, they intend to develop full theory of high power plasma-filled sources of microwave radiation in finite external magnetic field. Presently, theory of high power microwave plasma devices actually considers cylindrical waveguide with thin annular e-beam and coaxial thin annular plasma. External longitudinal magnetic field is assumed to be strong enough to freeze transversal motion of plasma and beam electrons. Dispersion properties of such systems make possible to control frequency of beam-plasma interaction by changing plasma density. At changing over to higher frequencies dispersion properties of plasma-filled systems set upper limit on the value of external magnetic field. Thus, the problem must be solved with the limiting value of external magnetic field. Investigation of beam-plasma interaction in finite external magnetic field is important to develop theory of basic mechanisms of radiation of beam electrons: single particle and collective Cherenkov effects and anomalous Doppler Effect.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 17, 2007
- Accession Number
- ADA487615
Entities
People
- Eduard V. Rostomyan