10-MW, W-band RF source for advanced accelerator research

Abstract

A conceptual design is presented for a W-band RF source that should be suitable for testing advanced accelerator structures and related components. The source is an 8 th -gyroharmonic converter, in which 28 MW of Xband power at 11.424 GHz is used to energize and spin up an injected 500 kV, 40 beam in a TE 111 cavity; and in which over 10 MW of W-band power at 91.392 GHz is extracted from the beam in a TE 811 output cavity. A mode converter is employed to provide a Gaussian output beam.

High power seventh harmonic converter at 20 GHz

“…An 8 th harmonic converter [2] similar to the one described here was designed to produce 10 MW of 91 GHz RF using the 11.4 GHz magnicon at NRL [5]. The design of harmonic converters of this type, although not trivial, are straightforward and well within current state of the art in both design codes and manufacturing techniques.…”

“…A two cavity 8 th harmonic converter was previously designed to generate power at 91 GHz. [2] The basic principle is to utilize an existing high power microwave tube (a SLAC XK-5 klystron for the converter described here) and up-convert the RF to a frequency of interest. For the device described here, 2.856 GHz power is used to generate, via a seventh harmonic interaction, output power at19.992 GHz.…”