Seventh Harmonic 20 GHz Co-Generator

51068-98-I Seventh Harmonic 20 GHz Co-Generator--Omega-P, Inc., 202008 Yale Station, New Haven, CT 06520-2008; (203) 458-1144 Dr. Jay L. Hirshfield, Principal Investigator Mr. George P. Trahan, Business Official DOE Grant No. DE-FG02-98ER82632 Amount: $75,000 A future multi-trillion electron-volt (TeV) electron-positron collider for use in particle physics research is thought to require a high-power radio frequency (rf) driver at a frequency that is higher than that of any available source. Development of high gradient accelerating structures and associated high-power microwave components will be stymied without such a high-frequency source. This project will develop a means to obtain high power at frequencies of 20 GigaHertz (GHz) and above using existing klystron power sources. In Phase I, preliminary experimental tests of gyroharmonic co-generation at 20 GHz will be performed. These tests will employ a high quality 300 kilovolt, 30 ampere electron beam source and a 24 megawatt S-band klystron, and thus require little new design and construction. A preliminary co-generator will be built to match the existing beam source. Design computations will be carried out for advanced co-generators with higher output power and efficiency for Phase II experimental evaluations. Power transfer to the 20 GHz mode will be monitored as beam parameters and magnetic field profile are adjusted, to test theoretical prediction of high 20 GHz output. Commercial Applications and Other Benefits as described by the awardee: As research and development on high-gradient multi-TeV particle colliders advances, demand will exist for high power rf sources for laboratory tests of accelerating structures and associated high-power components. Availability of a frequency-multiplying co-generator to furnish this power, at frequencies of 20 GHz and higher, that utilizes existing high-power klystrons (or magnicons) would open up a substantial market for a new class of rf sources._