Investigation of the Alignment Method for High-Frequency Gyrotrons

The successful operation of the gyrotron strongly depends on the proper alignment of the gyrotron with the magnet. The difficulty of the alignment will increase as the frequency becomes higher, especially for the terahertz pulsed gyrotron. In this article, we describe an easily implemented alignment method in detail. A triaxial adjusting flange was designed to align the gyrotron. The alignment of the gyrotron can be identified by the fluorescent effect of the electron beam on the sapphire output window, which will be captured by triggering a charge-coupled device camera. The affine transformation was also used to correct the distorted image. The validity of the proposed alignment method is verified via a prototype of an 800-GHz second-harmonic pulsed gyrotron.