Final Report for NRL Contract N00014-87-C-2523.
Abstract
A small signal theory for the harmonic gyroklystron (HGK ) has been developed. The theory uses approximate analytical solutions for the cavity fields of vaned magnetron-like cavities. A computer program called SSHGK has been written to calculate the small signal gain, resonant frequency, R/Q Q(0), and related quantities for a given set of cavity dimensions, beam parameters, magnetic field, and cavity loading. Program results indicate that there are broad ranges of input parameters which will produce acceptable small signal gain at the second and third cyclotron harmonics. A representative design has been outlined for 35 GHz operation at the second cyclotron harmonic. An electron gun and magnetic focusing system has been designed to generate the required thin, hollow, axis encircling electron beam. This integrated gun and focusing system has been developed and modeled to easily generate the desired beam trajectories and cross section. This new design produces beams with high ratios of transverse to longitudinal momentum (alpha), and low velocity spreads required by gyro-amplifiers such as the HGK. Using this design, a given gun structure can produce electron beams with adjustable alphas, beam radii, beam currents, annular widths, and velocity spreads just by changing the electrode voltages and magnetic field profile. (aw)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA216274