Gridded Sheet Beam Electron Gun for High Power RF Applications

65478 The Next Linear Collider (NLC) will employ an innovative waveguide system called the Multi-moded Delay Line Distribution System (MDLDS). Klystrons with power capabilities of 50-100 MW per tube will be used for the radio frequency (RF) sources. 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 MDLDS frequency (11.424GHz). This program will develop a new configuration for circulators using the TE01 mode in an overmoded waveguide, capable of passing 50-100 MW. In addition, the technology will be used to design high-efficiency, active, waveguide switches. Phase I will investigate the feasibility of constructing and operating a TE01 based circulator at the 50-100 MW power level. If the device meets the required objectives, a test device will be constructed, and the RF properties will be measured and compared to calculations. Commercial Applications and Other Benefits as described by 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.