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A High-Brightness, X-Band Photoelectron Linac--Duly Research, Inc., 1912 MacArthur Street, Rancho Palos Verdes, CA 90275-1111; 310-548-7123
Dr. David U.L. Yu, Principal Investigator
Dr. David U.L. Yu, Business Official
DOE Grant No. DE-FG03-98ER82566
Amount: $600,000
This project will develop a high-frequency, ultrashort-bunch, photoelectron, linear accelerator (linac) that is capable of producing the brightest electron beam to date. The goal is to achieve a 20-MeV beam of high current (1nC per bunch), with low emittance (1 mm-mrad), and a target brightness of 1015 A/m2. The high brightness is achievable by accelerating a tightly focused electron beam, which is generated from a laser-illuminated photocathode, in an integrated, multi-cell, X-band (8-12 GHz) radio frequency (rf) linac. The linac employs a novel accelerator design called the plane wave transformer (PWT) in which cells are strongly coupled, thus easing manufacturing tolerances and costs. Phase I demonstrated the feasibility of the high-brightness, X-band, photoelectron linac through design and simulation. Phase II will include the detailed design and hardware implementation of a high-power, X-band, rf system and a permanent-magnet focusing system. An accelerating structure will be fabricated, assembled and cold tested. Finally, beam testing of a 20-MeV, X-band, photoelectron linac, including laser synchronization of the photocathode and rf pulses, will be performed.
Commercial Applications and other Benefits as described by the awardee: Ultrashort, high-quality electron bunches should be useful in advanced high energy physics accelerators, such as linear colliders that will use metallic/dielectric structures or laser acceleration schemes. Integrated photoelectron linacs should have multiple applications in research, industry, and medicine, including compact electron injectors for advanced light sources (such as X-ray free electron lasers), fourth generation synchrotrons, and Compton backscattered X-rays.