High Efficiency Klystron Development for Particle Accelerators

The International Linear Collider (Report to Snowmass 2021)

“…Recently, the High Efficiency International Klystron Activity (HEIKA) collaboration [63,64] has been formed that investigates novel techniques for high-efficiency klystrons. Taking advantage of modern beam dynamic tools, methods such as the Bunching, Alignment and Collecting (BAC) method [65] and the Core Oscillation Method (COM) [66] (Fig. 4.9) have been developed that promise increased efficiencies up to 90 % [67].…”

“…It is assumed that this will be possible by applying the results from this R&D effort to high-efficiency klystrons. Figure 4.9: Electron phase profile of an 800 MHz klystron employing the Core Oscillation Method (COM) [66].…”