Design of a 10 MW, 91 GHz Gyroklystron for Linear Accelerators--Calabazas Creek Research, 20937 Comer Drive, Saratoga, CA 95070-3753; 408-741-8680
Dr. Jeffrey Neilson, Principal Investigator
Dr. R. Lawrence Ives, Business Official
DOE Grant No. DE-FG03-99ER82754
Amount: $750,000

In recent design scenarios for advanced linear colliders with center-of-mass energies above 1 TeV, the expected radio frequency (RF) drive frequency is typically above X-Band. Unfortunately, in terms of peak power, the capability of current RF source technology is several orders of magnitude below anticipated requirements. It has been well demonstrated in the past that gyrotrons significantly outperform conventional tubes in the millimeter regime. This project will utilize gyroklystron technology with state-of-the-art X-Band klystrons to develop an RF source at 91.392 GHz that has a peak power capability about 3 orders of magnitude above the state-of-the-art for linear tubes. In Phase I, a design was developed that provides 10 MW of RF power while maintaining all parameters (voltage gradients, power loadings, mode purity, emission density, and field strengths) within acceptable limits. In Phase II, the design will be completed, and a prototype gyroklystron will be built and tested. Phase II will result in a source that will be capable of testing W-Band accelerator components and (with pulse compression) capable of driving a W-Band accelerator structure.

Commercial Applications and Other Benefits as described by the awardee: High power W-Band sources should have applicability at research centers to test the viability of W-Band accelerator components in terms of breakdown fields, peak and average power capabilities, etc. The tube could also power an accelerator structure to look at issues such as dark current. Other potential applications include land- and ship-based radars, medical accelerators, and materials processing.

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