Investigations Into X-Band Dielectric Assist Accelerating Structures for Future Linear Accelerators

Dielectric disk accelerating (DDA) structures are being studied as an alternative to conventional disk-loaded copper structures. This paper investigates numerically efficient X-band DDA structure operating at a higher order mode of TM02-{\pi}. consists dielectric disks with irises arranged periodically in metallic enclosure. Through optimizations, the RF power loss on wall can be significantly reduced, resulting extremely high quality factor Q_0=111064 and very shunt impedance R_shunt=605 M{\Omega}/m. The RF-to-beam efficiency reaches 46.6% which is than previously-reported CLIC-G only 28.5%. optimum geometry regular end cells described detail. Due wide bandwidth from dispersion relation mode, allowed have maximum number 73 frequency separation 1.0 MHz, superior that In addition, found short-range transverse wakefield lower structure.