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The main accelerating structures for the CLIC are designed to operate at anaverage accelerating gradient of 100 MV/m. The accelerating frequency has beenoptimised to 11.994 GHz with a phase advance of 2{\pi}/3 of the mainaccelerating mode. The moderately damped and detuned structure (DDS) design isbeing studied as an alternative to the strongly damped WDS design. Both thesedesigns are based on the nominal accelerating phase advance. Here we explorehigh phase advance (HPA) structures in which the group velocity of the rffields is reduced compared to that of standard (2{\pi}/3) structures. Theelectrical breakdown strongly depends on the fundamental mode group velocity.Hence it is expected that electrical breakdown is less likely to occur in theHPA structures. We report on a study of both the fundamental and dipole modesin a CLIC_DDS_HPA structure, designed to operate at 5{\pi}/6 phase advance percell. Higher order dipole modes in both the standard and HPA structures arealso studied.

A High Phase Advance Damped and Detuned Structure for the Main Linacs of Clic