With our collaborators we are developing RF technologies that will enable the next generation of energy and intensity frontier accelerator facilities.

The development of an RF cavity pressurized with hydrogen to be used for muon beam cooling for muon colliders led to analytical studies and beam studies of the cavity quality factor and frequency as a function of various gases and dopants. From this we developed a design of a novel pressurized gas-filled multi-RF-cavity beam profile monitor that is simple and very robust in high-radiation environments. Charged particles passing through each RF-cavity in the monitor produce ionized plasma, which changes the permittivity of the gas and the resonant frequency of the cavity.

Standard RF techniques to measure the change in quality factor (Q) and frequency (f) as a function of time are then used to determine the change in permittivity and corresponding beam intensity in each cavity in the profile monitor. Beam intensity sensitivity is adjustable by varying gas pressure and RF amplitude.