Pumping of a two-mirror resonator with rippled walls by a relativistic electron beam
Abstract
The use of a two-mirror resonator in a Cerenkov source excited by an intense relativistic electron beam is described. The calculated wavelength was 2.4 cm. A beam diameter of 0.85 of tthe distance between the mirrors was chosen in order to minimize the cyclotron absorption resulting from the effect of the zeroth spatial harmonic on the electrons, while maintaining the Cerenkov harmonic at an amplitude adequate for a high efficiency. The electron source was a high-current accelerator with an injector voltage up to 600 kV, a current of 4-6 kA, and a pulse length of 80 ns. The parameters of the RF radiation are in rather close agreement with the calculations. The length of the emission pulse is shorter than the voltage pulse, apparently because of RF breakdown. The output power is a nonmonotonic function of the magnetic field,. Emission range of magnetic fields. The maximum radiation power was 300 MW at an efficiency of 15 percent.
- Publication:
-
Pisma v Zhurnal Tekhnischeskoi Fiziki
- Pub Date:
- August 1982
- Bibcode:
- 1982PZhTF...8..911Z
- Keywords:
-
- Cerenkov Radiation;
- Electron Pumping;
- Radio Frequencies;
- Relativistic Electron Beams;
- Resonators;
- Electric Pulses;
- Mirrors;
- Oscillators;
- Electronics and Electrical Engineering