Multiphysics Analysis of Normal Conducting RF Cavities for High Intensity Proton Accelerators

M. Hassan[1], I. Gonin[1], T. Khabiboulline[1], V. Yakovlev[1]
[1]Fermi National Accelerator Laboratory, Batavia, IL, USA
Published in 2013

Normal conducting cavities are typically used in the front end of proton accelerators to get the beam accelerated to velocities approximately a few tenths of the speed of light, where superconducting cavities can then be used to accelerate the beam to the speed of light. The warm part of a typical proton accelerator would contain a radio frequency quadrupole (RFQ) and several buncher cavities. The RF heating in normal conducting cavities was successfully modeled using COMSOL Multiphysics® for several resonant structures. For the RFQ results demonstrated, the projected frequency shift that could happen due to thermal stresses, which is a vital factor for proper operation of the whole RFQ structure, is basically fine-tuned through water temperature.