High-power testing of 11.424-GHz dielectric-loaded acceleratingstructures

摘要

The design, construction, and bench testing of an X-bandtravelling-wave accelerating structure loaded with a permittivity=20dielectric has been published recently by the Argonne AdvancedAccelerator Group. We describe a new program to build a test acceleratorusing this structure. The accelerator will be powered using high-power11.424-GHz radiation available at the Magnicon Facility at the NavalResearch Lab. The magnicon is expected to provide up to 30 MW from eachof two WR-90 output waveguide arms in pulses of up to 1-μs duration,permitting tests of the dielectric-loaded X-band device at gradients of~40 MV/m. The use of higher power pulses (100-500 MW) eventuallyavailable at the output of an active pulse compressor driven by themagnicon will permit gradients in excess of 100 MV/m to beachieved