RF Cavity Chain and Magnetic Circuit for a 650 kW, 1.3-GHz Low-Voltage Multi-Beam Klystron for the Project -X Pulsed Linac

The quest for deepened understanding of the origin of the universe requires continued search for elementary particles, for which high-energy accelerators are necessary tools. Reducing the size, complexity, and cost for future accelerators is essential if they are ever to be built. New technologies that can underlie future accelerators, be they for basic science or for applications, are needed to meet these goals, including that proposed here. A multi-beam 650 kilowatt peak power pulsed klystron is to be developed to meet Fermi National Accelerator Laboratory requirements for the 3-8 GeV high-energy linac for Project X. This new RF source will be distinguished by its low operating voltage of 22 kilovolts and its long pulse length of 7.5 milliseconds. This grant is to support development of the RF cavity chain and magnetic circuit for the tube.Commercial Applications and Other Benefits: New RF sources with parameters not available for existing sources can find applications in medical therapy, nuclear waste remediation, and industrial processing.