Development of sheet beam klystron beam-stick with Wiggler focusing

The article introduces the test of beam cross-section, focusing field and transmission rate of sheet beam klystron with Wiggler focusing. Characteristics of Wiggler focusing are analyzed and the test method of improving the transmission rate is obtained. The test results show that the transmission rate varies significantly when the same set of magnets are laid in different arrangements. The mismatch of beam and Wiggler field can even lead to a transmission rate of zero. The transmission rate for different field periods is obtained and the period of 9 mm is the best choice, which results in a good transmission rate under a relatively low voltage and a magnetic field of bad uniformity.