Highly-Efficient 20-MW L-Band Multi-Beam Klystron

Statement of problem or situation that is being addressed: The efficient generation of microwave power has recently gained broad attention in the accelerator community because energy consumption is one of the major concerns for future large-scale high energy accelerator projects. Efforts to achieve high efficiency in high RF power sources for future large-scale accelerators such as the Compact Linear Collider (CLIC), International Linear Collider (ILC), and similar accelerators are centered on multiple beam klystrons (MBK). General statement of how this problem is being addressed: A new concept of the Two-Stage Multi Beam Klystron (TS-MBK) that allows for a remarkably high RF power production efficiency approaching 90% is proposed. It also yields a compact design and delivers a cost-effective electro-mechanical solution. The design is for a 1 GHz, 20-23 MW peak-power klystron. The high efficiency that is predicted is about 20% higher than conventional MBK designs, and is due to good bunching of its 12, 30-kV, 12-A 2.31 µP hollow beams; followed by 150 kV post-acceleration that results in 0.157 µP beamlets that drive the output cavity. What is to be done in Phase I: During Phase I of this project, Omega-P R&D, Inc will refine its conceptual design of the 1.0 GHz TS-MBK, perform mechanical tolerance analysis, and collector design and cooling requirements for several levels of average power output. In parallel, Communication & Power Industries, LLC will perform preliminary engineering design, cost estimates for fabrication and testing of a prototype to be carried out during Phase II, and preliminary market research. Commercial Applications and Other Benefits: The proposed RF source is for use in accelerator, medical, national security, and environmental cleanup applications. The 1000 MHz frequency for this project is chosen to demonstrate to match potential future needs of accelerators, for example such as the Compact Linear Collider (CLIC).