Development of C-band (5712 MHz) high power waveguide components

High power waveguide components at C-band (5712 MHz) frequencies have been developed for a main linac of a e⁺e^- linear collider in the range 300-500 GeV C.M. energy. 350 MW of maximum rf power has to be transmitted through the waveguide components. An EIA-WR187 (W: 44.55 mm, H: 22.15 mm and t: 4 mm) type sized conventional rectangular waveguide was chosen to reduce transmission loss to about the same order of magnitude as with an existing S-band waveguide. The thickness of the waveguide was fixed to make for easy machining, and assembling for the brazing process. A vacuum waveguide flange of unisex type with a simple shape was successfully developed. A Beth-hole type coaxial coupler, E- and H-corner, directional coupler, vacuum pumping port, 3-stub tuner, viewing port and phase shifter were successfully developed all with input VSWRs of less than the 1:1.1