Fig. 1. Schematics of a single resonant cavity

Fig. 2. Two-dimensional schematic of a single resonant cavity

Fig. 3. Radial electric and magnetic field field distributions of TEM and TM₀₁ modes in the coaxial resonant cavity

Fig. 4. Electric and magnetic field distributions in I and II zones of a coaxial resonant cavity

Fig. 5. Schematic of a designed coaxial resonator

Fig. 6. Simulated Q-factor values of a single-gap coaxial resonant cavity versus Δr

Fig. 7. Simulated frequency and Q-factor values of a single-gap coaxial resonant cavity versus Δl

Fig. 8. Schematic of a compact coaxial RKA

Fig. 9. First harmonic current ratios in the coaxial RKA with different Q factors

Fig. 10. Typical results of HPM output