Analysis of the deflection system for a magneticfieldimmersed magnicon amplifier
Abstract
A linear analysis of the electron beam deflection system in a magnicon is presented. The system consists of identical cavities, one driven and the remainder passive, separated by a drift space, and immersed in an axial magnetic field. The cavities contain a rotating TM 110 mode. The length of each cavity is pi nu sub z/omega and that of the drift space is pi nu sub z/omega sub c where omega is the RF frequency, omega sub c is the relativistic gyrofrequency in the guide field and nu sub z is the mean axial velocity of the beam electrons. The linearized electron orbits are obtained for arbitrary initial axial velocity, radial coordinate and magnetic field. The small signal gain and the phase shift are determined. The special case where omega sub c/ omega = 2 has unique features and is discussed in detail. For example, this special case gives rise to a constant phase of the electrons relative to that of the TM 110 mode and the passive cavity may be driven optimally for a given beam current. For this magnicon design, a power gain of 10 dB per passive cavity is feasible. Operation of the output cavity at the fundamental and high harmonics of the input drive frequency is briefly discussed.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 November 1991
 Bibcode:
 1991STIN...9215365H
 Keywords:

 Cavities;
 Deflection;
 Electron Beams;
 Magnetic Fields;
 Magnetic Signals;
 Microwave Amplifiers;
 Radio Frequencies;
 Harmonics;
 Linear Systems;
 Orbits;
 Phase Shift;
 Power Gain;
 Instrumentation and Photography