Optimization of room temperature CH-cavity with cell-cavity approximation

Compared with the IH structure (110-mode), the CH structure (210-mode) can operate at higher frequencies (150~700 MHz) and can accelerate ions to higher energies (up to 150 MeV). Detailed microwave studio(MWS) simulations were performed for this structure. Since a multi-gap cavity can be approximated as a quasi-periodic structure, it is possible to analyze one bl/2-cell at an energy corresponding to the cavity centre. A reduced copper conductivity of 85% was adopted in effective shunt impedance calculations. Geometry variations with respect to RF frequency and shunt impedance can be performed rapidly by that method in the first stage of optimization. Using the transit time factor calculated by the beam dynamics simulation code LORASR, effective shunt impedances from 100 MΩ/m down to 45 M?