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Paper   IPM / ILSF / 17334
  Title:   Simulation study for efficiency optimization of multi-beam klystron output cavity
1.  M. Ostovar
2.  B.A. Arand
3.  S. Ahmadiannamin
4.  A. Sadeghipanah
  Status:   Published
  Journal: Review of Scientific Instruments
  Year:  2023
  Supported by:  IPM
Increasing klystron tubes' efficiency is essential in developing new-generation colliders and FELs. Different factors can affect the efficiency of a multi-beam klystron. One of the significant factors is the electric field symmetry inside cavities, especially in the output section. In this research, two different types of couplers are investigated in the extraction cavity of a forty-beam klystron. The first approach is a single slot coupler which is frequently utilized and easier to be fabricated but disturbs the electric field symmetry inside the extraction cavity. The second method has a more complex structure with symmetric electric fields. In this design, the coupler consists of 28 mini slots on the inner wall of the coaxial extraction cavity. Both designs are evaluated via Particle In Cell simulations, and the results exhibit around 30 percent more power extracted from the structure with symmetric field distribution. The symmetric structures can also decrease the number of back-streamed particles by up to 70 percent.

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