Figure 9
From: A high-efficiency L-band coaxial three-period relativistic Cherenkov oscillator

Electron beam is collected by (a) the left end of the coaxial extraction and (b) the inside of the coaxial extractor.
From: A high-efficiency L-band coaxial three-period relativistic Cherenkov oscillator
Electron beam is collected by (a) the left end of the coaxial extraction and (b) the inside of the coaxial extractor.