A HIGH-EFFICIENCY CYCLOTRON-WAVE AMPLIFIER,
Abstract
A finite-beam cyclotron wave amplifier with an electrostatic disc pump structure is investigated neglecting space charge and d-c magnetic rotation. Large signal analysis is used to show that the electrons of a finite beam exhibit variations of orbital radii, axial velocity and phase. These variations limit the gain, the amount of R-F power which can be extracted by the output coupler, and the potential to which a collecgtor can be depressed, hence the power output and efficiency. Equations are developed for the power output, efficiency and optimum load resistance for an output Cuccia coupler when the beam has rotational and axial velocity spread and phase shift. Design equations and curves are developed for a practical tube with a tapered pump section. It is shown that efficiencies of approximately 60 percent can be expected if the beam radius is limited to six tenths of the initial orbit radius at a gain of 10 db and a power output of about 100 watts. An efficiency of 70 percent can be expected if the beam area, and hence the power output, is reduced to 50 per cent of the previous value. Confined flow focusing is assumed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 20, 1963
- Accession Number
- AD0424177
Entities
People
- C. C. Johnson
- J. E. Dalley
Organizations
- University of Utah