Multiphysics simulation of a FEBIAD ion source

The FEBIAD ion source is routinely operated at TRIUMF-ISAC to produce radioactive ion beams, however there is scope to improve the ionization efficiency and beam quality. To achieve this improvement, simulations with the Comsol multiphysics software suite and experimental studies are being performed. Preliminary simulations indicate that the ionization rate inside the anode exhibits a spatial variation determined by the local electron fluence. The FEBIAD electromagnet coil is included in a simulation for the first time and a first validation of the methodology is the reproduction of experimental observables, e.g. the ion current generated as a function of the electromagnet coil current. The multiphysics approach of the simulations, and the experimental validation, can lead to a better understanding with possibilities to optimize the FEBIAD ion source and improve its versatility. With ARIEL, TRIUMF’s new ISOL facility, two target stations with improved target-ion source flexibility will open additional avenues to implement modified designs of a FEBIAD with increased capabilities.