Microwave Matching and Tuning on the 20-MeV Medical Electron Linac with Feedback of RF Power

In the linac with feedback (or with the resonator) the reflection affects the energy gain of the electron and the performance of the accelerator. By means of the theory of the traveling wave resonator, the field multiplication factor and the reflection coefficients inside and outside the feedback ring are calculated. The bands of the linacs without and with feedback are measured. In order to achieve a desirable band, in front of the load (i.e. outside the feedback ring) a matching iris is added. After the linac with feedback has been matched, the band is given.