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In this paper, we discuss the design and whole-cavity simulation of aMulti-Beam Inductive Output Tube (MBIOT) that uses a 3rd harmonic component tothe drive voltage on the grid. High-efficiency inductive output tubes (IOTs)are typically characterized by efficiencies up to 70 - 75%. However, theachievement of efficiencies greater than 80% would substantially reduce theoperating costs of next-generation accelerators. To achieve this goal, weconsider the addition of a 3rd harmonic component to the drive signal on thegrid. We anticipate that the MBIOT will be used to provide the rf power todrive RF linacs. We discuss and model an 8-beam MBIOT with a 700 MHz resonantcavity using beams with a voltage of 35 kV and an average current of 7.25 Ayielding a perveance of about 1.1 microP. We simulate this MBIOT using theNEMESIS simulation code which has been extended using a three-dimensionalPoisson solver based upon the Petsc package from Argonne National Laboratory.The effect of the 3rd harmonic on the efficiency is greatest when the phase ofthe 3rd harmonic is shifted by pi radians with respect to the fundamental drivesignal and with 3rd harmonic powers greater than about 50% of the fundamentaldrive power. For the present example, we show that efficiencies approaching 82%are possible. Designs for the MBIOT input coupler, grids and output cavity havebeen developed based on these simulations and will be discussed.

Comprehensive design and whole-cavity simulation of a multi-beam inductive output tube using a 3rd harmonic drive on the grid