Radiation frequency dynamics in a relativistic magnetron

S-band microwave radiation by a high-impedance diode with an A6 anode block

“…[11][12][13] Earlier research [14][15][16] of high-impedance (!50 X) RMs with radial microwave power output showed its high microwave power efficiency ($60%). Recently, [17][18][19][20][21] we demonstrated the increase in the microwave pulse duration up to $150 ns with the same high efficiency. However, for long (!100 ns) microwave pulses, RMs have some specific features not typical to conventional magnetrons.…”

“…Namely, the power of the microwave pulses and the frequency vary significantly with very small changes in the reflection coefficient of the microwaves from the load; 19 the microwave generation continues despite a significant decrease (to a half) in the applied voltage and the microwave frequency drifts (by $10%) relative to their value at the beginning of the oscillations. [20][21][22] In addition, in RM experiments 10 with multi-channel microwave output, the power radiated from the open resonant cavities adjacent to closed cavities was found to depend on the direction of the external axial magnetic field. These results show that the operation of this highimpedance magnetically insulated electron diode with an A6 anode block differs significantly from the conventional description of magnetrons.…”