Comparison of standing wave accelerators operating in the 2π/3 and π/2 modes

Calculations of fields in standing wave accelerators operating in the 2Π/ 3 and Π/ 2 modes have been done using a set of RLC coupled loop circuits to determine equilibrium current solutions. These results have been compared to experimental on-axis field measurements in an S-band accelerating structure. Tolerances of the two systems to frequency and coupling-constant differences are discussed as well as to operation slightly off-resonance. All results indicate that the Π/2 mode is significantly less sensitive to construction and operational differences.