Design and test of permanent magnet used in high power microwave devices
A permanent magnet (PM) is one of the guiding magnet systems of high power microwave (HPM) sources. A relativistic backward wave oscillator (RBWO) packaged by the PM system has the advantages of compact structure, high efficiency and high repetition frequency. On the basis of the Halbach array, the theoretical design and the manufacture structure of the PM are proposed. The simulated magnetic flux density reaches 0.98 T, within a diameter of 50 mm. By employing the PIC simulation, the integrated design is carried out combining the PM and the RBWO. The output power of the RBWO is larger than 1 GW. Furthermore, the PM is manufactured and tested. The uniform length is 110 mm, the weight is 306 kg and the measured magnetic flux density is 0.88 T in center.