Analysis of RF modes in the ANL APS vacuum chamber using computer simulation, electron beam excitation, and perturbation techniques

A real-time MAFIA-T3 study in 3-D was done to investigate RF modes in the APS (Advanced Photon Source) vacuum chamber, and a measurement of modes excited by a 38-ps, 20-MeV electron beam has been completed. Some measurements taken with a network analyzer and bead perturbation equipment are also discussed. It is concluded that any TM/sub z/ modes excited in the beam chamber will be confined there.<>