Multi-Megawatt Circulator for TE01 Waveguide

65478 The Next Linear Collider (NLC) will employ klystrons tubes with power capabilities of 50-100 MW per tube at 11.424 GHz. To protect the klystrons from reflected power in the system, circulators will be needed. However, current state-of-the-art circulators are not capable of passing more than 1 MW at the NLC frequency. This program will develop a new configuration using the TE01 mode in an overmoded waveguide, capable of passing 50-100 MW at the NLC frequency (11.424GHz). Phase I demonstrated the feasibility of constructing a TE01 based circulator at the 50-100MW power level. In Phase II, high power (50-100MW) measurements of the electrical properties of various ferrite materials will be made. Based on those measurements, a design for a prototype 50-100MW TE01 based circulator will be completed. This design will then be built and tested to its maximum power level. Commercial Applications and Other Benefits as described by the awardee: The circulator technology should have direct applications for pulse compressors for high-power radars and medical accelerators. The technology should also find application in development of components for W-band radar and industrial heating that are not available using current technology.