Simulation of the RF Coupler for TRIUMF ISAC-II Superconducting Quarter Wave Resonators

The inductive RF coupler for the TRIUMF ISAC-II 106 MHz superconducting accelerating quarter wave resonators [1, 2] was used as a basis for the simulation model of stationary transmission processes of RF power and thermal fluxes. Electromagnetic simulation of the coupler was done with ANSOFT HFSS code. Transmission line theory [3] was used for electromagnetic wave calculations along the drive line to the Coupler. An analogy between electric and thermal processes allows the thermal calculations to be expressed in terms of electrical circuits [4]. The data obtained from the simulation are compared to measured values on the RF coupler.