Wave and Mode Interaction in Overmoded High-Power Amplifiers of Short-Wavelength Radiation (from W-band up to THz)
Abstract
This work was done in the following directions: 1. Excitation of parasitic waves near cutoff in forward-wave amplifiers; 2. Periodic dielectric slow-wave structures; 3. Role of metallic dust on operation of high-power sources of electromagnetic radiation. The problem of excitation of dangerous parasitic modes in high-power amplifiers operating in high-order waves was studied, first, assuming strong focusing fields, in which electrons perform 1D motion. Then, the approach was generalized to the case of weak guiding fields, in which electrons exhibit 3D motion. The effect of guiding fields and other parameters on the conditions of parasitic excitation was analyzed and illustrated by design examples. Periodic dielectric slow-wave structures may exhibit an interesting class of new metamaterials attractive for high-power, millimeter-wave amplifiers. The theory of such structures has been developed and illustrated by some examples. Heating and melting of small micro-particles (metallic dust) in strong microwave fields may initiate the breakdown events in high-power microwave (HPM) sources. These processes have been studied in HPM sources operating in rep-rate regimes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2012
- Accession Number
- ADA578535
Entities
People
- Gregory S. Nusinovich
Organizations
- University of Maryland